Process for preparing Polyoxymethylene dimethyl ether through acetalization reaction

A technology of polyoxymethylene dimethyl ether and process, which is applied in the field of preparation of polyoxymethylene dimethyl ether by acetalization reaction, can solve the problems of low production efficiency, complicated production process, and low separation efficiency, and achieve improved utilization efficiency, overcome more processes, and improve work efficiency

Inactive Publication Date: 2016-05-04
赵建英
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AI Technical Summary

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.

Method used

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Embodiment

[0011] The acetalization reaction of the present embodiment prepares the technological process of polyoxymethylene dimethyl ether, comprises the following steps:

[0012] (1) A formaldehyde polymerization reaction rectification zone, including a reaction rectification device, gas phase condenser; using acidic ionic liquid ILI as catalyst, using 50wt% formaldehyde aqueous solution, continuous polymerization reaction occurs at 90°C and 0.1Mpa to form trimerization Formaldehyde, the gas discharged from the reactive distillation unit is the azeotrope of paraformaldehyde, formaldehyde and water, containing 50wt% paraformaldehyde and 20wt% formaldehyde; the gas enters the gas phase condenser V6 after being condensed, and enters the condenser after condensation. Formylation reactor R2; the cation part of the acidic ionic liquid ILI is selected from one of quaternary ammonium cations, quaternary phosphine cations, imidazolium cations, pyridinium cations or heterocyclic cations, and the...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/56
CPCY02P20/10Y02P20/584
Inventor 赵建英
Owner 赵建英
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