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Thiophene Removal and Recovery from Coking Crude Benzene by Adsorption Method

Author: TianRenLiang
Tutor: WangGuangHui
School: Wuhan University of Science and Technology
Course: Chemical processes
Keywords: thiophene coking crude benzene selective adsorption CeY zeolite thiophene recovery
CLC: TQ522.5
Type: Master's thesis
Year: 2011
Downloads: 103
Quote: 1
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Abstract


The high thiophene content in coking crude benzene has seriously affected quality of the benzene product. Thiophene was also valuable chemical material, so it would have a great economic value to thiophene removal and recovery. Therefore, the thiophene removal and recovery from coking crude benzene by adsorption method were studied in this dissertation.Adsorbents Ce-CeY of different Ce impregnation amount prepared by incipient-wetness impregnation with zeolite CeY, which be prepared by ion exchanging with NaY zeolite, were investigated by XRD, Nitroge Adsorption Experiment and FT-IR. The thiophene recovery, adsorbent regeneration and recycling were also studied.The results indicated that Ce(Ⅳ) of CeY created a great deal of active site which could beπcomplexation, S-Ce interaction and hydrogen bonding with thiophene. Simultaneously, the pore size of adsorbents became narrowed due to the dispersion of CeO2 formed by impregnation of Ce on zeolite, which could be selective adsorption to thiophene for different molecular size. The pore size was narrowed, the thiophene selective adsorption performance was increased, and then decreased, with the Ce impregnation amount increasing. The thiophene removal of 8.5 %Ce-CeY could be 100 %, in the condition of 30℃, 1/ 14(adsorbent(g)/ model liquid(ml) ) and 120 min(contact time).Thiophene could be recovered whose yield was 30 % by solvent washing method, using DMSO as solvent. The thiophene removal of adsorbent regenerated by direct calcination was essentially as the original adsorbent. The thiophene removal could still maintain more than 80 % after repeated three times.

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CLC: > Industrial Technology > Chemical Industry > Coke chemical industry > The high temperature carbonization of coal > By-product recovery, chemical products recovery
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