CAJ | 학술논문

在固定床微反实验装置上,选择正十六烷和大庆蜡油为原料,通过改变反应条件和催化剂类型研究了单、双分子反应对丙烯和干气生成的影响.结果表明,强化单分子反应有利于液化气中丙烯含量的提高,但干气产率也会同时增加;而一定程度上促进双分子反应,尤其是负氢离子转移反应的发生有助于抑制干气的生成,但程度太高时却不利于丙烯的生成.利用单、双分子反应的可控制性,采取措施合理调节反应过程中各自的比例和程度是降低现有催化裂解多产丙烯技术于气产率的有效途径.
재고정상미반실험장치상,선택정십륙완화대경사유위원료,통과개변반응조건화최화제류형연구료단、쌍분자반응대병희화간기생성적영향.결과표명,강화단분자반응유리우액화기중병희함량적제고,단간기산솔야회동시증가;이일정정도상촉진쌍분자반응,우기시부경리자전이반응적발생유조우억제간기적생성,단정도태고시각불리우병희적생성.이용단、쌍분자반응적가공제성,채취조시합리조절반응과정중각자적비례화정도시강저현유최화렬해다산병희기술우기산솔적유효도경.
Based on analyzing the reaction chemistry of deep catalytic cracking,a basic idea for producing more propylene while reducing dry gas yield was proposed.The effect of monomolecular reactions and bimolecular reactions on the yields of propylene and dry gas was investigated in a fixed-bed micro-activity test unit using n-hexadecane and Daqing VGO as feedstocks respectively,under various reaction conditions and catalyst types.The results showed that enhancing monomolecular reactions could be favorable for increasing the propylene content in LPG,but the dry gas yield increased significantly. Promoting bimolecular reactions,mainly hydride transfer reactions,to some extent,would be helpful to inhibit the formation of dry gas;however,the high ratio of bimolecular reactions could cause the decrease of propylene yield.Hence,proper adjusting the ratio and/or the sequence of monomolecular reactions and bimolecular reactions might be an effective way for maximizing propylene yield and reducing dry gas yield simultaneously in deep catalytic cracking process.