Process for regenerating pinacolone by absorption of pinacolone production tail gas by concentrated hydrochloric acid

Abstract

The invention relates to a process for regenerating pinacolone by absorption of pinacolone production tail gas by concentrated hydrochloric acid. The process is characterized by comprising the following specific processes: S1, precooling and concentration increase of concentrated hydrochloric acid; S2, preparation of 2-isopentane chloride; S3, synthesis of pinacolone; S4, decoloring. The pinacolone product produced with the method has high purity, color and luster of the product are ensured, tail gas generated in production can be recycled for production of pinacolone, and green production istruly realized; besides, reaction time can be effectively shortened by precooling of concentrated hydrochloric acid, and production efficiency is improved; the preparation process is simple, no wasteacid is generated in the preparation process of pinacolone, and environmental pressure is relieved. A decoloring process is added after rectification, hydrochloric acid is prevented from being mixed in the product, and on the basis of ensuring purity of the product, the color and luster of the product can also be ensured, so that the colorless pinacolone product with purity higher than or equal to98% can be prepared.

Description

technical field [0001] The invention relates to the field of pinacolone production, in particular to a process for producing tail gas by using concentrated hydrochloric acid to absorb pinacolone and reproducing pinacolone. Background technique [0002] Pinacolone, namely 3,3-dimethyl-2-butanone, is an important raw material for the production of pesticides such as fenzaine and pleiotrope, and an intermediate for various fine chemical products such as medicines and dyes. There are many synthetic methods of pinacolone, and the rearrangement method uses pinacol as a raw material, which is dehydrated and rearranged in an acidic environment to generate [Guizhou Chemical Industry 2006 4 (31 ): 4-6]. The disadvantage of this method is that the source of raw material pinacol is difficult and the reaction conditions are harsh. Oxidation method uses 2,3-dimethyl-2-butene as raw material, oxidizes with organic peroxyacid or hydrogen peroxide as oxidant, and then rearranges to obtain p...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is to provide a kind of technology that utilizes concentrated hydrochloric acid to absorb pinacolone to produce tail gas to regenerate pinacolone, can solve the problem that adopts water to absorb by-product hydrochloric acid and isopentene in the production of pinacolone, and isopentene is insoluble in Water, hydrochloric acid absorbed by water is difficult to deal with;