Process method for preparing polyformaldehyde dimethyl ether from methanol

Abstract

The invention relates to a process method for preparing polyformaldehyde dimethyl ether from methanol. The process method adopts an oxidation reaction zone and a reaction rectification zone, wherein the oxidation reaction zone comprises a methanol storage tank (1), a preheater (3), a fixed bed reactor (5) and a pre-mixing tank (7); the oxidation reaction zone comprises the following process steps: preheating methanol to be gasified, mixing with preheated air, feeding into the fixed bed reactor, performing catalytic oxidation on a formaldehyde catalyst prepared through methanol oxidization, thereby generating formaldehyde, feeding the formaldehyde into the pre-mixing tank (7), pre-mixing the formaldehyde with methanol and a circulated and recycled mixture inside the pre-mixing tank before being reacted, and further feeding into the reaction rectification zone; the reaction rectification zone comprises a reaction rectification tower (12), three serially connected separation rectification towers and a product storage tank (28) in sequence; the three serially connected separation rectification towers are respectively a first separation rectification tower (17), a second separation rectification tower (22) and a third separation rectification tower (25). The process method has the characteristic that the yields of n=3 and n=4 are high.

Description

technical field

[0001] The invention relates to a process for preparing polyoxymethylene dimethyl ether with methanol. Background technique

[0002] In recent years, low-carbon has become a major social theme and has gained increasing attention. For example, how to reduce the highly polluting exhaust emissions brought about by the booming automobile manufacturing industry and how to improve the efficiency of fuel oil use has become a research topic of many institutions.

[0003] It is generally accepted that oxygenates are very suitable as diesel blending components. At present, many companies and research institutes are investing in finding and screening suitable oxygen-containing compounds, and the screening objects include: acetals, alcohols, carbonates, lipids, ethers, glycol derivatives, etc. For diesel, oxygenated compounds need to have high cetane number, low self-ignition point, and fast ignition. In addition, it should have good miscibility with ordinary diesel o...

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