Process device and method for producing polyoxymethylene dimethyl ethers matched with formaldehyde by iron-molybdenum process

Abstract

The invention discloses a process device for producing polyoxymethylene dimethyl ethers matched with formaldehyde by an iron-molybdenum process. The process device comprises an iron-molybdenum-process formaldehyde reacting unit, a formaldehyde concentrating unit, methylal reacting unit and a polyoxymethylene dimethyl ether reacting unit, wherein the methylal reacting unit comprises a methylal reactor and a methylal rectifying device which are connected with each other successively; the methylal reactor is provided with a methanol raw material inlet; the methylal rectifying device is provided with a methylal outlet and is respectively connected with the iron-molybdenum-process formaldehyde reacting unit and the polyoxymethylene dimethyl ether reacting unit; the iron-molybdenum-process formaldehyde reacting unit is provided with a formaldehyde outlet and is connected with the formaldehyde concentrating unit; the formaldehyde concentrating unit is provided with a thick formaldehyde outlet and a diluted formaldehyde by-product outlet; the thick formaldehyde outlet is connected with the polyoxymethylene dimethyl ether reacting unit; and the diluted formaldehyde by-product outlet communicates with the methylal reacting unit in a circulating manner.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology and equipment, and mainly relates to the production technology of polyoxymethylene dimethyl ether. Background technique [0002] The existing production process of polyoxymethylene dimethyl ether (DMMn) is: the formaldehyde produced by the silver method is concentrated and granulated to generate paraformaldehyde or paraformaldehyde, and paraformaldehyde or paraformaldehyde is mixed with low-concentration methylal (below 92%) react to generate polyoxymethylene dimethyl ether. This production process has large investment due to the addition of paraformaldehyde production process and paraformaldehyde production process, and the production process is long, and the production concentration of formaldehyde using silver as a catalyst is not high in the production process, making the operation uneconomical. In addition, a large amount of dilute formaldehyde is produced, which is di...

AI Technical Summary

Problems solved by technology

Due to the production process of paraformaldehyde and paraformaldehyde in this production process, the investment is large, the production process is long, and the production concentration of formaldehyde using silver as a catalyst is not high in the production process, making the operation uneconomical

In addition, a large amount of dilute formaldehyde is produced, which is difficult to deal with

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