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[Chemical Knowledge]：Propylene glycol ether production process and preparation method

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Propylene glycol ether is an important organic chemical, which is widely used in coatings, cosmetics, printing ink, polyurethane, resin and other fields. The preparation method of propylene glycol ether has also been widely concerned. This article will introduce the production process and preparation method of propylene glycol ether.

The production process of
propylene glycol ether includes direct synthesis and indirect synthesis. The direct synthesis method is obtained by directly reacting propylene glycol with an etherifying agent at higher temperature and pressure. The indirect synthesis method is to oxidize propylene glycol and a certain amount of ethylene to ethylene oxide, and then the ethylene oxide is etherified to obtain propylene glycol ether. These two methods have their own advantages and disadvantages. The direct synthesis method is simple to produce, but the impurities such as aldehydes are slightly more, while the indirect synthesis method can obtain a purer product, but the process is complex and the cost is higher.

the preparation method of propylene glycol ether is divided into different types, including the preparation method of methoxy propylene glycol, ethoxy propylene glycol and propylene glycol butyl ether.

The preparation methods of
methoxypropylene glycol mainly include direct synthesis and indirect synthesis. The direct synthesis method requires a high temperature and high pressure environment and can be obtained by the reaction of formaldehyde and propylene glycol. (CH2O C3H8O → C4H10O2). The indirect synthesis law is to make methanol and propylene oxide by reaction and then hydrogenation conversion.

The preparation method of
ethoxy propylene glycol also has direct synthesis method and indirect synthesis method. The direct synthesis method requires a specific catalyst, and the condensation reaction of ethanol and propylene glycol with sodium hydroxide catalyst gives propanol, a substance with a structure similar to ethoxypropylene glycol, which is then prepared by dehydration reaction. The indirect synthesis law is that ethylene and propylene oxide are reacted to obtain ethylene oxide, and then ethoxypropylene glycol is obtained by etherification reaction.

propylene glycol butyl ether refers to a propane compound containing two hydroxyl groups and one butyl group. The preparation methods are mainly divided into direct synthesis and indirect synthesis, both of which require special attention to the regulation of reaction temperature and reaction time.

There are many ways to
the production process and preparation of propylene glycol ether, but the removal of impurities and the purity of the product should be paid attention to in the preparation process to ensure that propylene glycol ether has good application performance. The detailed preparation process and separation and purification method of propylene glycol ether are the key factors for the quality of the finished product.

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