关键词: MTP工艺, 混合芳烃, 连续精馏, 非芳烃馏分, 催化裂解, 气相产物, 液相产物, 汽油诱导期,

Abstract:

The mixed aromatic hydrocarbons produced by MTP(methanol to propylene) process were studied by using a real boiling point distillation apparatus at 100 ℃. The <100 ℃ non-aromatic fraction after cutting has a higher olefin content, and its mass fraction is about 40%, accounting for about 50% of the total amount of mixed aromatic hydrocarbons. The catalytic cracking reaction characteristics and product distribution of regenerated ZSM-5 catalyst in a gram catalytic cracking unit were studied. The results show that the average yield of regenerated dry gas is about 5% when the non-aromatic fraction(< 100 ℃) mixed with water and methanol as feed. With the extension of reaction time, LPG(C₃+C₄) shows a slow decreasing trend. The average yield of C⁺₅ in the liquid phase is about 60%, and the aromatic content is opposite to the olefin content with the extension of reaction time. The aromatic content in the non-aromatic fraction < 100 ℃ is significantly higher than that in the mixed aromatic fraction. The density of C⁺₅ components in the liquid phase is slightly higher than that of the non-aromatic fractions, and the density showed a decreasing trend as the reaction time is prolonged. In addition, the induction period of some samples in the initial reaction stage could exceed 480 min, meeting the requirements of the Guo Ⅵ gasoline standard.

Key words: MTP process, mixed aromatics, continuous rectification, non-aromatic fractions, catalytic cracking, gas phase product, liquid phase products, gasoline induction period,