Acid adding device used for preparing acyl chloride product

Abstract

The invention discloses an acid adding device used for preparing an acyl chloride product. The acid adding device used for preparing the acyl chloride product comprises a feeding bin (2) and also comprises a driving motor (5) and a rotating screw (6), wherein a feeding hole (4) and a discharge hole (8) are formed in the feeding bin, a feeding hole valve (3) and a discharge hole valve (7) are formed on the feeding hole and the discharge hole respectively, the driving motor is connected with the rotating screw, the driving motor is arranged at the upper end of the exterior of the feeding bin, and the rotating screw is arranged inside the feeding bin. The acid adding device used for preparing the acyl chloride product has the beneficial effects that an acid raw material is added into the feeding bin, the feeding bin is sealed, the acid raw material is discontinuously put into a reaction kettle under the action of the driving motor and the rotating screw, and the conditions that moisture in the air is brought in when the acid raw material is put into the reaction kettle so that decomposition of sulfoxide chloride is caused and product yield is reduced can be avoided.

Description

technical field [0001] The invention relates to an acid adding device, in particular to an acid adding device for preparing acid chloride products. Background technique [0002] Acyl chlorides, as an important chemical intermediate, are mainly produced through the reaction of thionyl chloride and corresponding acids, for example, 2,4,6-trimethylphenylacetyl chloride is prepared from thionyl chloride and 2,4,6 - Made by the reaction of trimethylphenylacetic acid. At present, many companies prepare acyl chloride products by first putting thionyl chloride into the reaction kettle, and intermittently adding the acid at the reaction temperature. Usually, a large amount of sulfur dioxide and hydrogen chloride will be generated in the reaction, so the reaction system needs to be connected to the tail gas absorption device. The reaction system is in a slight negative pressure state during the discharge process. Due to the pressure difference between the inside and outside of the r...

AI Technical Summary

Problems solved by technology

Due to the pressure difference between the inside and outside of the reactor, during the process of multiple acid feeding, a large amount of air with moisture will enter the reactor, which will easily lead to the decomposition of thionyl chloride and affect the product yield.

Images