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Thiophene sulfur the cracking law and the modified zeolite desulfurization performance

Author: YuanHaiLiang
Tutor: LuoYiBin
School: Research Institute of Petroleum
Course: Chemical Process
Keywords: Thiophene Cracking Modified Zeolites Desulfurization Desorption
CLC: TE624.9
Type: Master's thesis
Year: 2001
Downloads: 327
Quote: 4
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Abstract


FCC gasoline sulfur mainly in the form of thiophene sulfides exist. Catalytic cracking conditions to study the law of the of Modified Zeolites decane thiophene and short chain alkyl thiophene cracking . The results show that the thiophenes sulfide cracking Difficult order of thiophene lt ; 2 - methylthiophene LT ; 2,5 - dimethyl- thiophene . Thiophenes sulfides on a modified Y zeolite cracking reactions network established according to the experimental results , the thiophene sulfides first positive carbon ions are formed in the center of an acid intermediate , and then quickly alkyl transfer or alkylation reaction occurs , and through hydrogen transfer or active hydrogen hydrogenation of the C - S bond cleavage . The desulfurization performance of the different methods of modified Y zeolite . The results showed that the modification of aluminum exchange increased the amount of acid and Lewis acid , hydrogen transfer activity was enhanced to improve the molecular sieve cracking desulfurization activity . Zn exchange , impregnation and mechanical mixing modified zeolite cracking activity decreased desulfurization effect is not obvious . Molecular sieve Zn-Al glue surface modification , the Lewis acid in proportion to increase desulfurization effect also increase the hydrogen selectivity . Of thiophene in the modified Y zeolite and the oxide adsorption, desorption results show that thien on NaY adsorption occurs , but not the dissociation reaction occurs ; thien on a modified Y zeolite , 130 ℃ which can react to generate H 2 S and solid phase sulfur; increase in the amount of acid and with the molecular sieve , the increase in the amount of adsorption of the thiophene . Introducing Zn alumina can not increase the adsorption capacity of thiophene Zn - Al modified molecular sieve surface also failed to promote molecular sieve adsorption of thiophene the inferred thiophene adsorption sites in the zeolite acidic Center ; increase in Zn - Al to change performance the desulfurization effect of the molecular sieve , the reason may be an increase of the hydrogen-donating ability of the zeolite , forming a surface active hydrogen procure thiophene saturated , ring-opening cracking .

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CLC: > Industrial Technology > Oil and gas industry > Oil, natural gas processing industry > Petroleum refining > The refining process > Catalyst
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