Latest ArticlesA kind of porous adsorbent was developed by low temperature hydrothermal method, and it was compared with 801 adsorbent, silica gel, activated aluminum oxide, and 13X molecular sieve through the regeneration tests of degraded mineral transformer oil. The composition change of oil after regenerated by the adsorbent were analyzed by infrared spectrum. The results show that the adsorbent has the characteristic diffraction peak of β zeolite, the aperture of the adsorbent is 0.8-1 nm, the particle size is mainly 0.7-0.9 μm, the specific surface area reaches up to 680 m2/g, the molar ratio of Si and Al is 3:1-5:1, and it has strong polarity and selective adsorption. The adsorptive capacity of the porous adsorbent is stronger than 801 adsorbent, silica gel, activated aluminum oxide, and 13X molecular sieve. It can efficiently adsorb the unsaturated hydrocarbons from degradation transformer oil without damaging the basic components of the oil.
In order to improve the mechanical properties and thermal stability of cellulose insulating paper, the nano-SiO2, surface modified by KH550, was doped into cellulose insulating paper. The nano-SiO2/cellulose composite models with different grafting density were established through molecular simulation, and their mechanical properties, mean square displacement, cohesive energy density, solubility parameter, and radial distribution function were calculated and analyzed. The results show that when the grafting density of KH550 is 12.5%, the nano-SiO2/cellulose composite system has optimum deformation resistance, large cohesive energy density and solubility parameter.
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