Influence Of Spacing Layer And Hydrophobic Layer In The Alcohol And Water Separation Of Zeolites

Recently, nonrenewable fossil fuel was exhausted increasingly. As a kind of outstanding substitute of petroleum, the large-scale industrialized production of 2,3-BDO was of great importance. Nowadays, the main product method was bio-fermentation. Because the 2,3-BDO had a high boiling point, the next separation process had been the bottleneck problem. Hydrophobic zeolites attracted lots of attention for its reproducible, easy-handle and environment-friendly characteristics. Above all, this study constructed a series of zeolites that had a more superior performance in the adsorption separation.In this study, ZSM-5 was chosen to be modified the surface with a series of fluorosilicones. The spacing layer was built to add another more adsorption space. The hydrophobic layer was built to increase the priority to 2,3-BDO in order to enhancing the purity of 2,3-BDO. The static and dynamic adsorption was discussed in this paper. The series of zeolites were applied into separation of the n-butanol fermentation. The main research results were showed following:1.After the modification of fluorosilicones, the adsorption in the 2,3-BDO simulated fermentation of zeolites enhanced to 58 mg·g-1 that increased 61% comparing to the naked zeolite. The zeolites with a higher hydrophobility after modification got the 2,3-BDO with the purity of 98.3%.2.In the adsorption column of zeolites, the maximum saturation adsorption per milliliter was 16.38 mg·mL-1, increasing 81.2% to the naked zeolite.2,3-BDO with the purity of 96.6% was got. Elution rate was 90%. After reproduction, the maximum saturation adsorption per milliliter of zeolites maintained 91.5%.3. The effect of feed flux speed, height of packing layer, the modification on zeolites’surface on the breakthrough curve was discussed.4. The series of zeolites was applied in the separation of n-butanol fermentation. The max adsorption was 65.7 mg·g-1 increasing 86.1% to the naked zeolite.5.The effect of hydrophobic layer and spacing layer in the separation of zeolites was raised in this paper in order to make some new opinions and suggestions for the surface modification.