Preparation method of electronic grade propylene glycol methyl ether acetate

Abstract

The invention discloses a preparation method of electronic grade propylene glycol methyl ether acetate, and the method uses propylene glycol methyl ether and acetic acid as raw materials and adopts strong acidic cation resin catalyst to perform the esterification reaction. The method of the invention adopts the new technology of continuous production to realize the efficient industrial production of the electronic grade propylene glycol methyl ether acetate product; the operation mode is simple, the production efficiency is high, the discharge amounts of residue and wastewater can be reduced in the production process; the reaction product is not required to be neutralized with a large amount of alkali and washed with water; the catalyst has long service life, high catalytic activity and catalytic selectivity, good mechanical strength and no corrosion to the equipment; and the catalyst has the following advantages: the catalyst can be used repeatedly, be easy to separate from the reaction product, etc. The invention has good economic benefit and environmental benefit.

Description

technical field [0001] The present invention relates to a kind of preparation of organic compound, particularly relate to a kind of preparation method of electronic grade propylene glycol methyl ether acetate. Background technique [0002] Propylene glycol ether and ethylene glycol ether belong to glycol ether solvents. The toxicity of propylene glycol ether to human body is lower than that of ethylene glycol ether products. It can be regarded as a non-toxic or low toxicity product, because its molecular structure has ether function. The base has a hydroxyl group, so its solubility is very excellent, and it has the characteristics of suitable volatility and reactivity, so it has been widely used. In addition to being used as a solvent for a variety of high-end coatings, it can also be used for chemical intermediates, brakes, etc. Liquid, cleaning agent, anti-icing agent and many other fields. However, solvent-based cleaning agents, including metal degreasing and specialized...

AI Technical Summary

Problems solved by technology

The problem of this preparation method is that after the reaction, it needs to be neutralized by alkali and washed with water to remove the catalyst used, and the reaction has many side reactions, strong corrosion, complex process, low production efficiency, and produces a large amount of solids. Waste and waste water pollute the environment

However, the tin compound additive contained in this type of solid acid catalyst has high toxicity and is easy to be lost. Obviously, its practical application and promotion value will undoubtedly be greatly limited.

[0009] Because of the catalyst used in the existing technology, many metal ions in the finished product exceed the standard, which cannot meet the electronic grade product standard and cannot be used in the electronic chemical industry.

What's more, the products that exist in the batch production process must be neutralized and washed with water, and the production efficiency is low, and a large amount of solid waste gas and waste water are produced.

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