A kind of modification method of heavy component of methanol-based gasoline

Abstract

The invention discloses a modification method for heavy components of methanol-based gasoline, aiming to overcome the problems that the content of heavy components, especially durene in the methanol-based gasoline is higher. The method comprises the following steps: performing transalkylation reaction to methanol-based gasoline heavy components with benzene at the presence of a catalyst, wherein the mole ratio of benzene to the methanol-based gasoline heavy components is (3-6) to 1, the transalkylation reaction is carried out under the conditions that the temperature is at 380DEG C-450DEG C, the idle speed is 1.0h<-1>-4.0<-1>, and the pressure is at 0.5Mpa-5.0Mpa, and the catalyst for transalkylation reaction is a molecular sieve catalyst modified by rare earth and citric acid. Through using the method, polymethyl benzene, especially durene in the heavy components can be converted into aromatic hydrocarbon taking C8 and C9 as mains, and the yield of the methanol-based gasoline can be greatly improved.

Description

Technical field [0001] The invention relates to a method for modifying gasoline, in particular to a method for post-modifying the heavy components of methanol-based gasoline. technical background [0002] Methanol-to-gasoline (MTG) process refers to a process in which methanol is used as a raw material, and a specific catalyst is used for dehydration, oligomerization, isomerization and other steps at a certain temperature, pressure and space velocity to convert into hydrocarbon oil with a carbon number of less than 11 . In 1976, Mobil Corporation developed MTG technology based on its technology of converting methanol to aromatics. The overall process is to produce synthesis gas from coal or natural gas, then use synthesis gas to make methanol, and finally convert crude methanol into high octane. Value gasoline, the catalyst used is the ZSM-5 catalyst developed by Mobil Company. The main technological characteristics are: (1) MTG is a strong exothermic reaction, with a total reac...

AI Technical Summary

Problems solved by technology

At present, there are relatively few introductions on post-treatment modification methods for methanol-based gasoline heavy components. The mainstream post-treatment modification methods include disproportionation, isomerization, ring saturation and dealkylation / cracking reactions, which can reduce the content of durene to Less than 2wt.%, but the product liquid yield is relatively low, and the economic benefit is not high