关键词: 对二甲苯, 甲醇甲苯选择性烷基化, 甲苯选择性歧化, 甲苯歧化和烷基转移, 二甲苯异构化, 甲醇芳构化

Abstract:

The research progress on technologies for producing para-xylene (PX), including toluene disproportionation and trans-alkylation, xylene isomerization, methanol aromatization, selective disproportionation of toluene, and selective alkylation of toluene with methanol, has been reviewed in this paper. The pros and cons of these technologies have been discussed. Compared with methanol to aromatics technology, selective alkylation of toluene with methanol has significant advantages of high PX selectivity, short process and no adsorption separation unit, which is more favorable to realize the development of coal to PX industry. By coupling a unit for selective alkylation of toluene with methanol, the aromatics complex in petrochemical plants can increase PX production by more than 40% and doesn’t produce benzene ideally. The development trend in PX production technology is proposed: the technology of selective alkylation of toluene with methanol can promote the clean and efficient utilization of coal, ensure the polyesters industry safety, and is helpful to open a potential way for the coordinated development of coal chemical and petrochemical industries.

Key words: para-xylene, selective alkylation of methanol-toluene, selective disproportionation of toluene, toluene disproportionation and transalkylation, xylene isomerization, methanol aromatization