Production method of diethylene glycol dimethyl ether

Abstract

The invention discloses a production method of diethylene glycol dimethyl ether, which comprises four reaction kettles connected in parallel, a settling tank, a pre-separation tower, a dehydration tower, a finished product tower and a solvent recovery tower; the upper end faces of the four reaction kettles are respectively provided with a diethylene glycol methyl ether input passage, a sodium hydroxide input passage and an excessive diethylene glycol methyl ether reuse passage; the lower end faces of the four reaction kettles are respectively provided with a chloromethane input passage and a reaction liquid output passage, all raw materials fully react in the reaction kettles, then enter a settling tank for standing, settling and separating out solid waste sodium chloride, and then are rectified and separated step by step by utilizing a pre-separation tower, a dehydration tower, a finished product tower and a solvent recovery tower according to different boiling points of all components contained in supernatant liquid, thereby finally obtaining a finished product diethylene glycol dimethyl ether, and reusing the added excessive raw material diethylene glycol dimethyl ether in the reaction kettle. The reaction kettle has the advantages of reasonable process route design and high production efficiency, and can quickly and accurately judge whether the reaction in the reaction kettle is finished or not through the spotlight and the photodiode array.

Description

technical field [0001] The invention belongs to the technical field of production of chemical solvent products, and in particular relates to a production method of diethylene glycol dimethyl ether. Background technique [0002] Diethylene glycol dimethyl ether (DMDE for short) is a colorless neutral liquid with an ether smell, with a boiling point of 162°C, a relative density of 0.9467, and a refractive index of 1.4097. It has stable chemical properties, is not prone to chemical reactions, and can dissolve various Resin and cellulose, and can be miscible with water and many organic solvents such as alcohols, ethers, ketones, esters, hydrocarbons and chlorinated hydrocarbons in any proportion, and its solubility can be adjusted by appropriate dilution with water or some solvents. DMDE has many uses in organic synthesis, and is used as an alkali metal hydroxide solvent in the synthesis of metal organic compounds, alkylation reaction, polycondensation reaction and reduction rea...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many technological routes for the synthesis of DMDE, including hydrogenolysis of triethylene glycol monomethyl ether, hydrogenolysis of diethylene glycol ether polycondensation aldehyde, dehydration of ethylene glycol monomethyl ether, ether of diethylene glycol or its monomethyl ether Etherification reaction, dimethyl ether and ethylene oxide reaction, etc., among which the etherification reaction of diethylene glycol or its monomethyl ether is the most ideal, the process is simple, the operation is simple and safe; but the design of the process route is not reasonable, which affects the production efficiency problem; in order to solve the above problems, it is necessary to develop a production method of diethylene glycol dimethyl ether

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