Method for preparing crosslinking HEC pervaporation membrane for gasoline desulfurization

Abstract

The invention discloses a method for preparing a crosslinking HEC pervaporation membrane for gasoline desulfurization. The method comprises the steps of first dissolving hydroxyethyl cellulose, a crosslinking agent and benzoyl peroxide according to a mass ratio of (20-25):5:1, performing stirring, and preparing casting film liquid containing 12-16% of hydroxyethyl cellulose; evenly coating the clean surface of a glass plate with the casting film liquid, performing gelatination at room temperature and performing drying for 48 h, and performing vacuum drying; soaking the obtained membrane in the solution, using deionized water to repeatedly wash and remove unreacted impurities, performing drying, and obtaining the crosslinking HEC pervaporation membrane for gasoline desulfurization. The membrane prepared according to the process has excellent solvent-resistant stability, 1,6-hexanediol diacrylate is selected as the crosslinking agent, the swelling degree of the membrane is controlled, the membrane strength is improved, and separation factors and permeate flux of the membrane are greatly improved. The crosslinking HEC pervaporation membrane has the advantages of being good in separating property, high in film-forming property and stable in structure and performance stability and the like, and the crosslinking HEC pervaporation membrane can be used for the gasoline desulfurization process with a large flow.

Description

technical field [0001] The invention relates to the field of membrane material preparation, in particular to a preparation method of a cross-linked HEC pervaporation membrane used for gasoline desulfurization. Background technique [0002] There are many sulfur compounds in gasoline, and sulfur compounds are important indicators affecting the air. The formation of acid rain is mainly due to the existence of excessive sulfur compounds. In PM2.5, sulfide is also a component. The emission requirements of automobiles are strict, and the concentration of PM2.5 microparticles will be reduced accordingly. [0003] At the same time, when sulfur-containing gasoline is burned, sulfur dioxide will be produced. Sulfur dioxide is one of the main pollutants in the atmosphere and an important indicator to measure whether the atmosphere is polluted. Sulfur dioxide not only has a strong stimulating effect on the upper respiratory tract, which may cause bronchial or asthma attacks, but also ...

AI Technical Summary

Problems solved by technology

At present, there are not many studies on gasoline membrane desulfurization at home and abroad, especially the lack of systematic research on the desulfurization performance of different types of membrane materials in various real gasoline.