Process for preparing Polyoxymethylene dimethyl ether through acetalization reaction

Abstract

The present invention discloses a process for preparing polyoxymethylene dimethyl ether through an acetalization reaction. According to the present invention, the process comprises the following two steps that under the catalysis effect of an ionic liquid ILI, a formaldehyde aqueous solution is subjected to a polymerization reaction to obtain a mixed aqueous solution of trioxymethylene and formaldehyde, and under the catalysis effect of an ionic liquid ILII, the mixed aqueous solution of trioxymethylene and formaldehyde and methanol are subjected to an acetalization reaction to prepare the polyoxymethylene dimethyl ether. According to the present invention, the formaldehyde aqueous solution is adopted as the initial reaction raw material, the continuous polymerization and the acetalization reaction are used to prepare the polyoxymethylene dimethyl ether, and the formaldehyde utilization rate is high; the film type evaporator is used, such that the rapid separation and the recycling of the light components are achieved, and the separation efficiency is high; and the catalyst separation is simple, and the catalyst recycling is achieved.

Description

technical field [0001] The invention belongs to the field of chemical technology, and in particular relates to a process for preparing polyoxymethylene dimethyl ether by acetalization reaction. Background technique [0002] The process of preparing polyoxymethylene dimethyl ether by acetalization reaction at least includes basic processes such as catalyst preparation, rectification, and separation. In the current process method for preparing polyoxymethylene dimethyl ether by acetalization reaction, the process flow is not easy to implement, the separation efficiency is low, the recycling of the catalyst cannot be realized, the production process is complicated, and the production efficiency is low. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide a process for preparing polyoxymethylene dimethyl ether by acetalization reaction. The present i...

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Problems solved by technology

In the current process method for preparing polyoxymethylene dimethyl ether by acetalization reaction, the process flow is not easy to implement, the separation efficiency is low, the recycling of the catalyst cannot be realized, the production process is complicated, and the production efficiency is low.