DMMn synthesis device and synthesis method adopting DMMn synthesis device

Abstract

The invention discloses a DMMn synthesis device and a synthesis method adopting the DMMn synthesis device. The DMMn synthesis device comprises a dissolving tank A and a dissolving tank B, wherein a methylal feed port and an alpha-polyformaldehyde feed port I are formed in the upper end of the dissolving tank A; a first polymerization reactor and a second polymerization reactor which are communicated at the top are arranged on one side of the dissolving tank A, the bottom of the first polymerization reactor is communicated with the bottom of the dissolving tank A through a communicating pipe I, and a first high-pressure pump is mounted at the bottom of the communicating pipe I; the dissolving tank B is arranged on one side of the second polymerization reactor, the bottom of the second polymerization reactor is communicated with the top of the dissolving tank B, and an alpha-polyformaldehyde feed port II is formed in the top of the dissolving tank B; a third polymerization reactor and a fourth polymerization reactor which are communicated at the top are arranged on one side of the dissolving tank B, the bottom of the third polymerization reactor is communicated with the bottom of the dissolving tank B through a communicating pipe II, and a second high-pressure pump is mounted on the communicating pipe II; a DMMn discharge pipeline is arranged at the bottom of the fourth polymerization reactor. The raw materials are added reasonably, and a technology of first decomposition and later polymerization is adopted, so that the technical problem of DMMn synthesis with alpha-polyformaldehyde is solved.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a polymethoxy dimethyl ether synthesis device and a synthesis method thereof. Background technique [0002] Polyoxymethylene dimethyl ether, also known as polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether, is a general term for a class of substances, and its simplified formula can be expressed as: CH 3 O(CH 2 O)nCH 3 (where n≥1, generally less than 10, represented by DMMn). [0003] There are two existing synthesis routes in the world, one is paraformaldehyde route and the other is formaldehyde route. The first-time yield is low and separation is difficult. During the synthesis process, a large amount of hemiacetal is generated, which is close to the boiling point of the finished product. It is difficult to separate it from the finished product, which increases the cost of separation and affects the quality of the product. [...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a polyoxymethylene dimethyl ether synthesis device and its synthesis method, to solve the problem of high cost of raw materials in the route of paraformaldehyde, complex separation of formaldehyde route, high cost of separation, high cost of final products, and polyoxymethylene synthesis. When methoxy dimethyl ether has a high viscosity, the product distribution is unreasonable and the N value is not easy to control. The preparation method of polyoxymethoxy dimethyl ether

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