A kind of reaction device and method for preparing polyoxymethylene dimethyl ether

Abstract

The invention relates to an apparatus for preparing polyoxymethylene dimethyl ether, and a method thereof. The apparatus comprises a raw material feeding pipeline, a reactor and a material circulation treatment device; the reactor is provided with a material inlet and a material outlet, and the material circulation treatment device comprises a cooler and a buffering tank; the raw material feeding pipeline is connected with the material inlet of the reactor, the cooler is arranged between the material outlet of the reactor and the buffering tank, and a branch outlet used for outputting a product is arranged between the material outlet and the cooler; and the bottom of the buffering tank is provided with a circulation material outlet directly or indirectly connected with the material inlet of the reactor, and the top of the buffering tank is provided with a trioxymethylene inlet. The apparatus for preparing polyoxymethylene dimethyl ether effectively prevents the backflow of trioxymethylene, avoids the pollution of a trioxymethylene raw material and enhances the reaction safety.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a reaction device for preparing polyoxymethylene dimethyl ether. Background technique [0002] In the prior art, for example, the patent application with the publication number CN202808649 discloses a system device for preparing polyoxymethylene dimethyl ether, including: a reaction system, a decompression flash system, an extraction system, an alkali washing system, a polishing Distillation and separation system; wherein: the reaction system includes a feed mixer, a loop reactor, a reactor circulating pump, a surge tank, and a circulating cooler; the reaction system uses ionic liquid as a catalyst, and the loop reactor is used to realize polyformaldehyde For the production of oxydimethyl ether, there are jackets on the outside of the loop reactor, and the steam, hot water or cooling water circulates in the jacket for heating, constant temperature or removal of heat; there is als...

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Problems solved by technology

The design of the existing reactor has the following defects: first, in an emergency, the material, especially the paraformaldehyde, may flow back with a certain probability, resulting in material loss and affecting the stability of the entire system. The material contains a catalyst, and the material in the pipeline or equipment through which the backflow material is aggregated is difficult to clean up; second, a single loop reactor, temperature adjustment device, and pressure adjustment device that are not divided into layers and levels make it difficult for the reaction The control is not accurate and fast enough, the adjustment of temperature and pressure is slow and the effect is relatively poor, resulting in difficult control of the reaction process and low yield

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