Method for producing dipropylene glycol butyl ether and tripropylene glycol butyl ether

Abstract

The invention discloses a method for producing dipropylene glycol butyl ether and tripropylene glycol butyl ether. The method creatively comprises the following steps: by taking tower bottom obtained after propanediol butyl ether is extracted as a raw material, performing ring-opening addition reaction with epoxypropane under the action of a strong-basicity catalyst, recycling excessive 2-butoxyl-1-propanol in a synthesis product, and rectifying to obtain a dipropylene glycol butyl ether product; then neutralizing the alcohol-ether solution obtained after propanediol butyl ether is extracted to be neutral with oxalic acid, filtering out generated sodium oxalate through a screen, rectifying and separating light components, and distilling to obtain a tripropylene glycol butyl ether product; then washing wet salt with methanol, rectifying the methanol solution, and recycling sodium oxalate and methanol, to obtain alcohol ether with high boiling point and realize clean production. The byproduct 2-butoxyl-1-propanol which is generated during production of propylene glycol butyl ether and is not popular with a downstream market is converted into environment-friendly solvents such as dipropylene glycol butyl ether and tripropylene glycol butyl ether which are crying needs by downstream enterprises.

Description

technical field [0001] The invention relates to a method for producing dipropylene glycol butyl ether and tripropylene glycol butyl ether, belonging to the field of clean production of organic solvents. Background technique [0002] Alcohol ether products contain both alcoholic hydroxyl groups and ether bonds. They are widely used solvents in the field of new materials such as coatings and inks. Although propylene glycol ether products started later than ethylene glycol ether products, since 1982, the European Chemical Industry and Toxicology Center published a toxicity research report on ethylene glycol ether products, pointing out that ethylene glycol ether products have harmful effects on animal bone marrow and lymphoid tissue. And embryos have varying degrees of toxicity, which can lead to blood lesions. After that, glycol ether products are restricted by some domestic and foreign regulations and standards, and their output is gradually shrinking. [0003] Since the EU ...

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Problems solved by technology

Sodium methoxide will decompose methanol under high temperature conditions. After the materials in the rectification kettle come into contact with air, methanol and air will form explosive gas. dangerous accident

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