Preparation method for photoinitiator of 2-hydroxy-2-methylpropiophenone

Abstract

The invention discloses a preparation method for a photoinitiator of 2-hydroxy-2-methylpropiophenone. The method comprises the following steps of carrying out acylation, specifically, putting isobutyric acid into a reaction kettle, carrying out heating to reach 48-52 DEG C, dropwise adding phosphorus trichloride, carrying out heat preservation for 4.8-5.2 hours, after the reaction, carrying out standing and separating out a lower-layer byproduct of phosphorous acid so as to obtain isobutyryl chloride; and carrying out Friedel-Crafts reaction, specifically, adding benzene and a catalyst of aluminum trichloride into the reaction kettle, carrying out cooling to reach 5-7 DEG C, dropwise adding isobutyryl chloride, carrying out heat preservation at 7-9 DEG C for 1.8-2.2 hours, after the reaction, carrying out hydrolyzing and water-washing so as to obtain the 2-hydroxy-2-methylpropiophenone, selling a by-product of an aluminum trichloride aqueous solution outside, carrying out second-stagewater absorption and first-stage alkali absorption on HCl gas generated by the reaction so as to obtain 30% hydrochloric acid to be recovered and sold and conveying wastewater to a sewage station to be treated to meet the standard emission. According to the method, the design is ingenious, the method is reasonable, the environment is protected, and the method is suitable for popularization.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of a photoinitiator 2-hydroxy-2-methylphenylpropan-1-one. Background technique [0002] UV-1173 is a high-efficiency free radical (I) type photoinitiator. The photoinitiator is a kind of active intermediate (free radical, cation or anion) with the ability to initiate polymerization after being excited to undergo chemical changes ), occupies an important position in the photocuring system, so the development of photoinitiators is inseparable from the development of UV curing technology. [0003] Photocuring technology is an excellent material surface treatment technology and processing technology with high efficiency, environmental protection and energy saving. It is known as a new technology of green industry in the 21st century. The technology began in the 19th century. With the development of modern science and technology, the application field o...

AI Technical Summary

Problems solved by technology

However, due to the high price of photoinitiators, their cost accounts for 10-15% of the overall cost of photocuring products. Therefore, the development of photoinitiators is of great significance to the development of the entire UV curing material industry, and the development of the latter also has a profound impact on Development of photoinitiator industry

Images