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Ethyl levulinate (EL) is a highly promising biomass fuel and additive, and the production of EL using yieldrich biomass is beneficial to the industrialized largescale production of EL. In this article, we studied the effects of sulfuric acid dosage, reaction time, reaction temperature and substrate concentration on the yield of EL using ultralow concentration sulfuric acid catalyzed cellulose, and optimized the EL production process by using response surface BoxBehnken model to study the effects of various factors on the yield of EL, and obtained the optimal process conditions for EL production from ultralow concentration sulfuric acid catalyzed cellulose: sulfuric acid dosage 0.5%, reaction temperature 204 °C, reaction time 240 min, substrate concentration 29 g/L reaction, the actual average yield of EL was 66.70%, with a relative error of 3.25% from the theoretical prediction. GCMS analyzed the distribution of alcoholysis products of ultralow concentration sulfuric acidcatalyzed cellulose under different reaction times, and proposed possible reaction pathways, the results of which can provide reference and reference for the alcoholysis conversion of cellulosic biomass.
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乙酰丙酸乙酯(EL)是极具潜力的生物质燃料和添加剂,利用产量丰富的生物质生产EL有利于EL的产业化、大规模化生产。文章利用超低浓度硫酸催化纤维素制备 EL,研究了硫酸用量、反应时间、反应温度和底物浓度对 EL产率的影响,并利用响应面 BoxBehnken 模型研究各因素对 EL产率的影响。优化EL制取工艺,得到了超低浓度硫酸催化纤维素制取 EL 的最优工艺条件:硫酸用量为0.5%,反应温度为204℃,反应时间为240 min,底物浓度为29 g/L, EL实际平均产率为66.70%,与理论预测值相对误差为3.25%。利用 GCMS 分析了不同反应时间下超低浓度硫酸催化纤维素的醇解产物分布,提出了可能的反应路径。研究结果可为纤维素生物质醇解转化提供借鉴和参考。
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1 College of Mechanical and Electrical Engineering Henan Agricultural University Zhengzhou 450002 China
2 Key Laboratory of New Materials and Facilities for Rural Renewable Energy Ministry of Agriculture Zhengzhou 450002 China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1154430690675385294, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, authorId=1154430690524390346, language=CN, stringName=陈一航, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1 College of Mechanical and Electrical Engineering Henan Agricultural University Zhengzhou 450002 China
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1 河南农业大学 机电工程学院 河南 郑州 450002
2 农业部农村可再生能源新材料与装备重点实验室 河南 郑州 450002, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1154430690381784003, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, xref=1, ext=[AuthorCompanyExt(id=1154430690385978308, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690381784003, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1 河南农业大学 机电工程学院 河南 郑州 450002)]), AuthorCompany(id=1154430690457281478, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, xref=2, ext=[AuthorCompanyExt(id=1154430690461475783, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690457281478, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1 College of Mechanical and Electrical Engineering Henan Agricultural University Zhengzhou 450002 China
2 Key Laboratory of New Materials and Facilities for Rural Renewable Energy Ministry of Agriculture Zhengzhou 450002 China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1154430691157730268, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, authorId=1154430690994152406, language=CN, stringName=郝金波, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1 河南农业大学 机电工程学院 河南 郑州 450002
2 农业部农村可再生能源新材料与装备重点实验室 河南 郑州 450002, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1154430690381784003, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, xref=1, ext=[AuthorCompanyExt(id=1154430690385978308, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690381784003, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1 河南农业大学 机电工程学院 河南 郑州 450002)]), AuthorCompany(id=1154430690457281478, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, xref=2, ext=[AuthorCompanyExt(id=1154430690461475783, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690457281478, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1 College of Mechanical and Electrical Engineering Henan Agricultural University Zhengzhou 450002 China
2 Key Laboratory of New Materials and Facilities for Rural Renewable Energy Ministry of Agriculture Zhengzhou 450002 China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1154430691375834084, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, authorId=1154430691233227743, language=CN, stringName=赵浩然, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
1, 2, address=
1 河南农业大学 机电工程学院 河南 郑州 450002
2 农业部农村可再生能源新材料与装备重点实验室 河南 郑州 450002, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1154430690381784003, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, xref=1, ext=[AuthorCompanyExt(id=1154430690385978308, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690381784003, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1 河南农业大学 机电工程学院 河南 郑州 450002)]), AuthorCompany(id=1154430690457281478, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, xref=2, ext=[AuthorCompanyExt(id=1154430690461475783, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690457281478, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1, 2, address=
1 College of Mechanical and Electrical Engineering Henan Agricultural University Zhengzhou 450002 China
2 Key Laboratory of New Materials and Facilities for Rural Renewable Energy Ministry of Agriculture Zhengzhou 450002 China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1154430691531023341, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, authorId=1154430691426165735, language=CN, stringName=徐桂转, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1 河南农业大学 机电工程学院 河南 郑州 450002
2 农业部农村可再生能源新材料与装备重点实验室 河南 郑州 450002, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1154430690381784003, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, xref=1, ext=[AuthorCompanyExt(id=1154430690385978308, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690381784003, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1 河南农业大学 机电工程学院 河南 郑州 450002)]), AuthorCompany(id=1154430690457281478, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, xref=2, ext=[AuthorCompanyExt(id=1154430690461475783, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690457281478, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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2 农业部农村可再生能源新材料与装备重点实验室 河南 郑州 450002)])])], keywords=[Keyword(id=1154430691849790451, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, orderNo=1, keyword=cellulose), Keyword(id=1154430691929482229, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, orderNo=2, keyword=extremely low acid), Keyword(id=1154430692009174008, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, orderNo=3, keyword=ethyl levulinate), Keyword(id=1154430692067894266, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, orderNo=4, keyword=response surface methodology), Keyword(id=1154430692143391740, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, orderNo=5, keyword=alcoholysis), Keyword(id=1154430692202111998, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, orderNo=1, keyword=纤维素), Keyword(id=1154430692285998079, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, orderNo=2, keyword=超低酸), Keyword(id=1154430692340524032, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, orderNo=3, keyword=乙酰丙酸乙酯), Keyword(id=1154430692420214785, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, orderNo=4, keyword=响应面), Keyword(id=1154430692504100867, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, orderNo=5, keyword=醇解)], refs=[Reference(id=1154430695192649791, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, doi=null, pmid=null, pmcid=null, year=2021, volume=39, issue=12, pageStart=1563, pageEnd=1569, url=null, language=null, rfNumber=[1], rfOrder=0, authorNames=李贤, 韩奎华, 王茜, journalName=可再生能源, refType=null, unstructuredReference=李贤, 韩奎华, 王茜, 等. 生物质成型燃料添加剂的研究进展[J].
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1 College of Mechanical and Electrical Engineering Henan Agricultural University Zhengzhou 450002 China), AuthorCompanyExt(id=1154430690402755525, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690381784003, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1 河南农业大学 机电工程学院 河南 郑州 450002)]), AuthorCompany(id=1154430690457281478, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, xref=2, ext=[AuthorCompanyExt(id=1154430690461475783, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690457281478, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2 Key Laboratory of New Materials and Facilities for Rural Renewable Energy Ministry of Agriculture Zhengzhou 450002 China), AuthorCompanyExt(id=1154430690465670088, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, companyId=1154430690457281478, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2 农业部农村可再生能源新材料与装备重点实验室 河南 郑州 450002)])], figs=[ArticleFig(id=1154430693376516111, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Fig. 1, caption=
Effect of ${\mathrm{H}}_{2}{\mathrm{{SO}}}_{4}$ loading on EL yield from cellulose, figureFileSmall=UKOpRipRlUOWtqaUsyvhDQ==, figureFileBig=KRaYBWq447lAsJEmzMRVug==, tableContent=null), ArticleFig(id=1154430693456207888, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=图 1, caption=
硫酸用量对纤维素制取 $\mathbf{{EL}}$ 产率的影响, figureFileSmall=UKOpRipRlUOWtqaUsyvhDQ==, figureFileBig=KRaYBWq447lAsJEmzMRVug==, tableContent=null), ArticleFig(id=1154430693531705362, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Fig. 2, caption=
Effect of reaction temperature on EL yield from cellulose, figureFileSmall=C4BOrtbNFInKdvnZ/CM6lg==, figureFileBig=xnY5g4e1H9MWZtL9CJPdUQ==, tableContent=null), ArticleFig(id=1154430693590425620, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=图 2, caption=
反应温度对纤维素制取 $\mathbf{{EL}}$ 产率的影响, figureFileSmall=C4BOrtbNFInKdvnZ/CM6lg==, figureFileBig=xnY5g4e1H9MWZtL9CJPdUQ==, tableContent=null), ArticleFig(id=1154430693653340181, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Fig. 3, caption=
Effect of reaction time on EL yield from cellulose, figureFileSmall=zcNz+Fc7plppOND84e2/Jw==, figureFileBig=WgNS6cws1owe5cEer8GcHw==, tableContent=null), ArticleFig(id=1154430693720449046, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=图 3, caption=
反应时间对纤维素制取 $\mathrm{{EL}}$ 产率的影响, figureFileSmall=zcNz+Fc7plppOND84e2/Jw==, figureFileBig=WgNS6cws1owe5cEer8GcHw==, tableContent=null), ArticleFig(id=1154430693774974999, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Fig. 4, caption=
Effect of substrate concentration on EL yield from cellulose, figureFileSmall=ZSxsQwvlIvJMYAT/7R2iXQ==, figureFileBig=A0xJ+cVqe0AfeuxLit6YbQ==, tableContent=null), ArticleFig(id=1154430693825306650, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=图 4, caption=
底物浓度对纤维素制取 $\mathrm{{EL}}$ 产率的影响, figureFileSmall=ZSxsQwvlIvJMYAT/7R2iXQ==, figureFileBig=A0xJ+cVqe0AfeuxLit6YbQ==, tableContent=null), ArticleFig(id=1154430693917581340, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Fig. 5, caption=
Response surface diagram of the interaction of factors affecting cellulose alcoholysis preparation EL, figureFileSmall=zXJfr+ATHf+HccUqxCwuRg==, figureFileBig=6fNwo4bVnyG7VYpJsRXqqg==, tableContent=null), ArticleFig(id=1154430693972107294, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=图 5, caption=
纤维素醇解制备 EL 影响因素交互作用响应面, figureFileSmall=zXJfr+ATHf+HccUqxCwuRg==, figureFileBig=6fNwo4bVnyG7VYpJsRXqqg==, tableContent=null), ArticleFig(id=1154430694022438944, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Fig. 6, caption=
GC-MS spectrum of Sulfuric acid-catalyzed cellulose alcoholysis products, figureFileSmall=AL9O/RdpIKNmrYSxsMbVUA==, figureFileBig=JTqGX0NDpfV7e5TbMOlXlQ==, tableContent=null), ArticleFig(id=1154430694081159203, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=图 6, caption=
硫酸催化纤维素醇解产物 GC-MS 图谱, figureFileSmall=AL9O/RdpIKNmrYSxsMbVUA==, figureFileBig=JTqGX0NDpfV7e5TbMOlXlQ==, tableContent=null), ArticleFig(id=1154430694135685158, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Fig. 7, caption=
Sulfuric acid-catalyzed cellulose alcoholysis pathway, figureFileSmall=NU2yn0dFWoA05rYhac7bOQ==, figureFileBig=7Z1C4mSi0jZK5rI8qnTqWw==, tableContent=null), ArticleFig(id=1154430694194405417, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=图 7, caption=
硫酸催化纤维素醇解路径, figureFileSmall=NU2yn0dFWoA05rYhac7bOQ==, figureFileBig=7Z1C4mSi0jZK5rI8qnTqWw==, tableContent=null), ArticleFig(id=1154430694257319981, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Table 1, caption=
Factors and levels of response surface methodology, figureFileSmall=null, figureFileBig=null, tableContent=
| 因素 | 变量 | 水平 |
| -1 | 0 | 1 |
| 硫酸用量/% | ${X}_{1}$ | 0.1 | 0.5 | 1.0 |
| 反应温度 ${\rho }^{ \circ }\mathrm{C}$ | ${X}_{2}$ | 180 | 195 | 210 |
| 反应时间/min | ${X}_{3}$ | 60 | 150 | 240 |
| 底物浓度 $/\mathrm{g} \cdot {\mathrm{L}}^{-1}$ | ${X}_{4}$ | 20 | 35 | 50 |
), ArticleFig(id=1154430694341206064, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=表 1, caption=
响应面试验因素与水平, figureFileSmall=null, figureFileBig=null, tableContent=
| 因素 | 变量 | 水平 |
| -1 | 0 | 1 |
| 硫酸用量/% | ${X}_{1}$ | 0.1 | 0.5 | 1.0 |
| 反应温度 ${\rho }^{ \circ }\mathrm{C}$ | ${X}_{2}$ | 180 | 195 | 210 |
| 反应时间/min | ${X}_{3}$ | 60 | 150 | 240 |
| 底物浓度 $/\mathrm{g} \cdot {\mathrm{L}}^{-1}$ | ${X}_{4}$ | 20 | 35 | 50 |
), ArticleFig(id=1154430694404120626, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Table 2, caption=
Experiment design and results of response surface methodology, figureFileSmall=null, figureFileBig=null, tableContent=
| 编号 | 硫酸用量 | 反应温度 ℃ | 反应时间 min | 底物浓度 g/L | EL 产率 % |
| 1 | 0.1 | 180 | 150 | 35 | 10.18 |
| 2 | 1.0 | 180 | 150 | 35 | 55.54 |
| 3 | 0.1 | 210 | 150 | 35 | 42.86 |
| 4 | 1.0 | 210 | 150 | 35 | 38.52 |
| 5 | 0.5 | 195 | 60 | 20 | 43.69 |
| 6 | 0.5 | 195 | 240 | 20 | 60.97 |
| 7 | 0.5 | 195 | 60 | 50 | 30.79 |
| 8 | 0.5 | 195 | 240 | 50 | 36.75 |
| 9 | 0.1 | 195 | 150 | 20 | 28.82 |
| 10 | 1.0 | 195 | 150 | 20 | 58.68 |
| 11 | 0.1 | 195 | 150 | 50 | 20.15 |
| 12 | 1.0 | 195 | 150 | 50 | 46.78 |
| 13 | 0.5 | 180 | 60 | 35 | 45.28 |
| 14 | 0.5 | 210 | 60 | 35 | 37.79 |
| 15 | 0.5 | 180 | 240 | 35 | 27.08 |
| 16 | 0.5 | 210 | 240 | 35 | 67.63 |
| 17 | 0.1 | 195 | 60 | 35 | 15.72 |
| 18 | 1.0 | 195 | 60 | 35 | 47.22 |
| 19 | 0.1 | 195 | 240 | 35 | 23.44 |
| 20 | 1.0 | 195 | 240 | 35 | 49.66 |
| 21 | 0.5 | 180 | 150 | 20 | 50.77 |
| 22 | 0.5 | 210 | 150 | 20 | 53.11 |
| 23 | 0.5 | 180 | 150 | 50 | 34.32 |
| 24 | 0.5 | 210 | 150 | 50 | 56.76 |
| 25 | 0.5 | 195 | 150 | 35 | 46.78 |
| 26 | 0.5 | 195 | 150 | 35 | 44.97 |
| 27 | 0.5 | 195 | 150 | 35 | 43.17 |
| 28 | 0.5 | 195 | 150 | 35 | 42.70 |
| 29 | 0.5 | 195 | 150 | 35 | 46.30 |
), ArticleFig(id=1154430694467035189, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=表 2, caption=
响应面试验设计和结果, figureFileSmall=null, figureFileBig=null, tableContent=
| 编号 | 硫酸用量 | 反应温度 ℃ | 反应时间 min | 底物浓度 g/L | EL 产率 % |
| 1 | 0.1 | 180 | 150 | 35 | 10.18 |
| 2 | 1.0 | 180 | 150 | 35 | 55.54 |
| 3 | 0.1 | 210 | 150 | 35 | 42.86 |
| 4 | 1.0 | 210 | 150 | 35 | 38.52 |
| 5 | 0.5 | 195 | 60 | 20 | 43.69 |
| 6 | 0.5 | 195 | 240 | 20 | 60.97 |
| 7 | 0.5 | 195 | 60 | 50 | 30.79 |
| 8 | 0.5 | 195 | 240 | 50 | 36.75 |
| 9 | 0.1 | 195 | 150 | 20 | 28.82 |
| 10 | 1.0 | 195 | 150 | 20 | 58.68 |
| 11 | 0.1 | 195 | 150 | 50 | 20.15 |
| 12 | 1.0 | 195 | 150 | 50 | 46.78 |
| 13 | 0.5 | 180 | 60 | 35 | 45.28 |
| 14 | 0.5 | 210 | 60 | 35 | 37.79 |
| 15 | 0.5 | 180 | 240 | 35 | 27.08 |
| 16 | 0.5 | 210 | 240 | 35 | 67.63 |
| 17 | 0.1 | 195 | 60 | 35 | 15.72 |
| 18 | 1.0 | 195 | 60 | 35 | 47.22 |
| 19 | 0.1 | 195 | 240 | 35 | 23.44 |
| 20 | 1.0 | 195 | 240 | 35 | 49.66 |
| 21 | 0.5 | 180 | 150 | 20 | 50.77 |
| 22 | 0.5 | 210 | 150 | 20 | 53.11 |
| 23 | 0.5 | 180 | 150 | 50 | 34.32 |
| 24 | 0.5 | 210 | 150 | 50 | 56.76 |
| 25 | 0.5 | 195 | 150 | 35 | 46.78 |
| 26 | 0.5 | 195 | 150 | 35 | 44.97 |
| 27 | 0.5 | 195 | 150 | 35 | 43.17 |
| 28 | 0.5 | 195 | 150 | 35 | 42.70 |
| 29 | 0.5 | 195 | 150 | 35 | 46.30 |
), ArticleFig(id=1154430694567698487, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Table 3, caption=
Results of regression model variance analysis, figureFileSmall=null, figureFileBig=null, tableContent=
| 方差来源 | 平方和 | 自由度 | 均方 | | | 显著性 |
| 模型 | 5015.82 | 14 | 358.27 | 24.57 | <0.000 1 | 显著 |
| ${X}_{1}$ | 1982.24 | 1 | 1 982.24 | 135.95 | <0.000 1 | |
| ${X}_{2}$ | 450.07 | 1 | 450.07 | 30.87 | <0.000 1 | |
| ${X}_{3}$ | 176.64 | 1 | 176.64 | 12.11 | 0.0037 | |
| ${X}_{4}$ | 413.95 | 1 | 413.95 | 28.39 | 0.000 1 | |
| ${X}_{1}{X}_{2}$ | 617.52 | 1 | 617.52 | 42.35 | <0.000 1 | |
| ${X}_{1}{X}_{3}$ | 4.58 | 1 | 4.58 | 0.31 | 0.584 0 | |
| ${X}_{1}{X}_{4}$ | 2.61 | 1 | 2.61 | 0.18 | 0.678 8 | |
| ${X}_{2}{X}_{3}$ | 576.96 | 1 | 576.96 | 39.57 | <0.000 1 | |
| ${X}_{2}{X}_{4}$ | 101.1 | 1 | 101.1 | 6.93 | 0.0197 | |
| ${X}_{3}{X}_{4}$ | 32.04 | 1 | 32.04 | 2.2 | 0.160 4 | |
| ${X}_{1}^{2}$ | 492.84 | 1 | 492.84 | 33.8 | <0.000 1 | |
| ${X}_{2}^{2}$ | 18.55 | 1 | 18.55 | 1.27 | 0.278 4 | |
| ${X}_{3}^{2}$ | 45.91 | 1 | 45.91 | 3.15 | 0.097 7 | |
| ${X}_{4}^{2}$ | 23.66 | 1 | 23.66 | 1.62 | 0.2235 | |
| 残差 | 204.13 | 14 | 14.58 | | | |
| 失拟项 | 190.86 | 10 | 19.09 | 5.76 | 0.0531 | 不显著 |
| 纯误差 | 13.26 | 4 | 3.32 | | | |
| 综合 | 5 219.95 | 28 | | | | |
), ArticleFig(id=1154430694639001657, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=表 3, caption=
响应面试验设计和结果, figureFileSmall=null, figureFileBig=null, tableContent=
| 方差来源 | 平方和 | 自由度 | 均方 | | | 显著性 |
| 模型 | 5015.82 | 14 | 358.27 | 24.57 | <0.000 1 | 显著 |
| ${X}_{1}$ | 1982.24 | 1 | 1 982.24 | 135.95 | <0.000 1 | |
| ${X}_{2}$ | 450.07 | 1 | 450.07 | 30.87 | <0.000 1 | |
| ${X}_{3}$ | 176.64 | 1 | 176.64 | 12.11 | 0.0037 | |
| ${X}_{4}$ | 413.95 | 1 | 413.95 | 28.39 | 0.000 1 | |
| ${X}_{1}{X}_{2}$ | 617.52 | 1 | 617.52 | 42.35 | <0.000 1 | |
| ${X}_{1}{X}_{3}$ | 4.58 | 1 | 4.58 | 0.31 | 0.584 0 | |
| ${X}_{1}{X}_{4}$ | 2.61 | 1 | 2.61 | 0.18 | 0.678 8 | |
| ${X}_{2}{X}_{3}$ | 576.96 | 1 | 576.96 | 39.57 | <0.000 1 | |
| ${X}_{2}{X}_{4}$ | 101.1 | 1 | 101.1 | 6.93 | 0.0197 | |
| ${X}_{3}{X}_{4}$ | 32.04 | 1 | 32.04 | 2.2 | 0.160 4 | |
| ${X}_{1}^{2}$ | 492.84 | 1 | 492.84 | 33.8 | <0.000 1 | |
| ${X}_{2}^{2}$ | 18.55 | 1 | 18.55 | 1.27 | 0.278 4 | |
| ${X}_{3}^{2}$ | 45.91 | 1 | 45.91 | 3.15 | 0.097 7 | |
| ${X}_{4}^{2}$ | 23.66 | 1 | 23.66 | 1.62 | 0.2235 | |
| 残差 | 204.13 | 14 | 14.58 | | | |
| 失拟项 | 190.86 | 10 | 19.09 | 5.76 | 0.0531 | 不显著 |
| 纯误差 | 13.26 | 4 | 3.32 | | | |
| 综合 | 5 219.95 | 28 | | | | |
), ArticleFig(id=1154430694718693434, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Table 4, caption=
Results of GC-MS analysis of sulfate-catalyzed cellulose products, figureFileSmall=null, figureFileBig=null, tableContent=
| 序号 | 识别组分(1h) | 识别组分(2h) | 识别组分(3h) | 识别组分(4h) |
| 1 | 1,1-二乙氧基乙烷 | 1,1-二乙氧基乙烷 | 1,1-二乙氧基乙烷 | 1,1-二乙氧基乙烷 |
| 2 | $\gamma$ -戊内酯 | $\gamma$ -戊内酯 | $\gamma$ -戊内酯 | $\gamma$ -戊内酯 |
| 3 | EL | EL | EL | EL |
| 4 | 乙酰丙酸 | 乙酰丙酸 | 乙酰丙酸 |
| 5 | 左旋葡萄糖酮 | 左旋葡萄糖酮 | 左旋葡萄糖酮 | 左旋葡萄糖酮 |
| 6 | 5-乙氧基甲基糠醛 | 5-乙氧基甲基糠醛 | 5-乙氧基甲基糠醛 |
| 7 | 苹果酸乙酯 | | |
| 8 | 1,4-二乙氧基丁烷 | | |
| 9 | 左旋葡聚糖 | 左旋葡聚糖 | 左旋葡聚糖 |
| 10 | 2-甲氧基-2-甲基丙烷 | 2-甲氧基-2-甲基丙烷 | 2-甲氧基-2-甲基丙烷 |
| 11 | 乙基葡萄糖苷 | 乙基葡萄糖苷 | 乙基葡萄糖苷 |
), ArticleFig(id=1154430694798385211, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=表 4, caption=
硫酸催化纤维素产物 GC-MS 分析结果, figureFileSmall=null, figureFileBig=null, tableContent=
| 序号 | 识别组分(1h) | 识别组分(2h) | 识别组分(3h) | 识别组分(4h) |
| 1 | 1,1-二乙氧基乙烷 | 1,1-二乙氧基乙烷 | 1,1-二乙氧基乙烷 | 1,1-二乙氧基乙烷 |
| 2 | $\gamma$ -戊内酯 | $\gamma$ -戊内酯 | $\gamma$ -戊内酯 | $\gamma$ -戊内酯 |
| 3 | EL | EL | EL | EL |
| 4 | 乙酰丙酸 | 乙酰丙酸 | 乙酰丙酸 |
| 5 | 左旋葡萄糖酮 | 左旋葡萄糖酮 | 左旋葡萄糖酮 | 左旋葡萄糖酮 |
| 6 | 5-乙氧基甲基糠醛 | 5-乙氧基甲基糠醛 | 5-乙氧基甲基糠醛 |
| 7 | 苹果酸乙酯 | | |
| 8 | 1,4-二乙氧基丁烷 | | |
| 9 | 左旋葡聚糖 | 左旋葡聚糖 | 左旋葡聚糖 |
| 10 | 2-甲氧基-2-甲基丙烷 | 2-甲氧基-2-甲基丙烷 | 2-甲氧基-2-甲基丙烷 |
| 11 | 乙基葡萄糖苷 | 乙基葡萄糖苷 | 乙基葡萄糖苷 |
), ArticleFig(id=1154430694886465596, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=EN, label=Table 5, caption=
Comparison of literature on the preparation of levulinic acid esters by cellulose alcoholysis, figureFileSmall=null, figureFileBig=null, tableContent=
| 序号 | 工艺条件 | 溶剂 | 产物 | 产率1% | 文献 |
| 1 | $\left\lbrack {{\mathrm{C}}_{4}{\mathrm{H}}_{8}{\mathrm{{SO}}}_{3}\mathrm{H}\text{ mim }}\right\rbrack {\mathrm{{HSO}}}_{4},{180}^{ \circ }\mathrm{C},{45}\mathrm{\;{min}}$ | 丁醇 | BL | 31.10 | [ 12 ] |
| 2 | Yb(OTf) ${}_{3}$ /PTSA, ${180}{}^{ \circ }\mathrm{C},5\mathrm{\;h}$ | 甲醇 | ML | 20.00 | [ 13 ] |
| 3 | [CnIMPS], ${\mathrm{{PW}}}_{12}{\mathrm{O}}_{40},{190}{}^{ \circ }\mathrm{C},1\mathrm{\;h}$ | 甲醇 | ML | 41.00 | [ 14 ] |
| 4 | [PyPS]PW ${}_{12}{\mathrm{O}}_{40},{150}{}^{ \circ }\mathrm{C},5\mathrm{\;h}$ | 甲醇 | ML | 48.40 | [ 15 ] |
| 5 | ${\left\lbrack \mathrm{{PyPS}}\right\rbrack }_{3}{\mathrm{{PW}}}_{12}{\mathrm{O}}_{40},{150}\mathrm{C},5\mathrm{\;h}$ | 乙醇 | EL | 57.50 | [ 15 ] |
| 6 | ${\mathrm{{Al}}}_{2}{\left( {\mathrm{{SO}}}_{4}\right) }_{3},{180}^{ \circ }\mathrm{C},3\mathrm{\;h}$ | 乙醇/甲苯 | EL | 51.60 | [ 16 ] |
| 7 | ${0.5}\% {\mathrm{H}}_{2}{\mathrm{{SO}}}_{4},{204}℃,4\mathrm{\;h}$ | 乙醇 | EL | 66.70 | 本文 |
), ArticleFig(id=1154430694949380157, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1154430652767265503, language=CN, label=表 5, caption=
纤维素醇解制备乙酰丙酸酯文献对比, figureFileSmall=null, figureFileBig=null, tableContent=
| 序号 | 工艺条件 | 溶剂 | 产物 | 产率1% | 文献 |
| 1 | $\left\lbrack {{\mathrm{C}}_{4}{\mathrm{H}}_{8}{\mathrm{{SO}}}_{3}\mathrm{H}\text{ mim }}\right\rbrack {\mathrm{{HSO}}}_{4},{180}^{ \circ }\mathrm{C},{45}\mathrm{\;{min}}$ | 丁醇 | BL | 31.10 | [ 12 ] |
| 2 | Yb(OTf) ${}_{3}$ /PTSA, ${180}{}^{ \circ }\mathrm{C},5\mathrm{\;h}$ | 甲醇 | ML | 20.00 | [ 13 ] |
| 3 | [CnIMPS], ${\mathrm{{PW}}}_{12}{\mathrm{O}}_{40},{190}{}^{ \circ }\mathrm{C},1\mathrm{\;h}$ | 甲醇 | ML | 41.00 | [ 14 ] |
| 4 | [PyPS]PW ${}_{12}{\mathrm{O}}_{40},{150}{}^{ \circ }\mathrm{C},5\mathrm{\;h}$ | 甲醇 | ML | 48.40 | [ 15 ] |
| 5 | ${\left\lbrack \mathrm{{PyPS}}\right\rbrack }_{3}{\mathrm{{PW}}}_{12}{\mathrm{O}}_{40},{150}\mathrm{C},5\mathrm{\;h}$ | 乙醇 | EL | 57.50 | [ 15 ] |
| 6 | ${\mathrm{{Al}}}_{2}{\left( {\mathrm{{SO}}}_{4}\right) }_{3},{180}^{ \circ }\mathrm{C},3\mathrm{\;h}$ | 乙醇/甲苯 | EL | 51.60 | [ 16 ] |
| 7 | ${0.5}\% {\mathrm{H}}_{2}{\mathrm{{SO}}}_{4},{204}℃,4\mathrm{\;h}$ | 乙醇 | EL | 66.70 | 本文 |
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