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[Chemical Knowledge]：Production and manufacturing method and process flow of dipropylene glycol butyl ether

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Dipropylene glycol butyl ether (DPnB) is a widely used chemical raw material, mainly used in solvents, cleaning agents, paints, inks and other fields. The following is a paper on the manufacturing method of dipropylene glycol butyl ether for your reference.

dipropylene glycol butyl ether manufacturing method

Abstract: This article introduces a dipropylene glycol butyl ether manufacturing method, the method includes the propylene glycol, butanol and acid catalyst mixture, esterification reaction, to obtain crude products, and then the crude product distillation, pure dipropylene glycol butyl ether. The method has the advantages of simple operation, mild reaction conditions and high product purity.

keywords: dipropylene glycol butyl ether, esterification, distillation, manufacturing method

introduction

dipropylene glycol butyl ether (DPnB) is an important organic solvent, widely used in printing ink, paint, cleaning agent and other fields. With the continuous development of industrial production, the demand for dipropylene glycol butyl ether is also increasing year by year. Therefore, it is of great significance to study an efficient and environmentally friendly manufacturing method of dipropylene glycol butyl ether. This paper introduces a method for the production of dipropylene glycol butyl ether by esterification reaction catalyzed by acid catalyst with propylene glycol and butanol as raw materials.

Experimental Part

1. Experimental Raw Materials and Instrument

Experimental Raw Materials: Propylene Glycol, Butanol, Sulfuric Acid

Experimental Instruments: Stirred Reactor, Thermometer, Reflux Condenser, Separator, Distillation Device

2. Experimental Steps
(1)
Add Metered Propylene Glycol, Butanol and Acid Catalyst into Stirred Reactor, Heat to Predetermined Reaction Temperature, Start Stirring Reaction. During the reaction of

(2), the reaction temperature was controlled by a reflux condenser, and moisture generated by the reaction was collected.

(3) After completion of the reaction, the reaction solution was cooled to room temperature, the remaining acidic catalyst was neutralized with a basic absorbent, and then the mixture was allowed to stand and separate into layers. The lower organic phase is separated

(4), I .e. the crude product dipropylene glycol butyl ether, and then the distillation operation is carried out to obtain pure dipropylene glycol butyl ether.

results and discussion

1. Effect of reaction temperature on product yield

experimental results show that the reaction temperature has a significant effect on the yield of dipropylene glycol butyl ether. With the increase of reaction temperature, the yield increased gradually. However, when the reaction temperature exceeds a certain value, the yield increase trend slows down, and may lead to an increase in side reactions. Therefore, the selection of appropriate reaction temperature is the key to ensure high yield.

2. The effect of catalyst dosage on the yield of the product

experimental results show that the amount of catalyst also has a certain effect on the yield of dipropylene glycol butyl ether. Increasing the amount of catalyst within a certain range can increase the yield. However, when the amount of catalyst is too large, it may lead to an increase in side reactions and reduce the purity of the product. Therefore, selecting the appropriate amount of catalyst is also the key to ensure high yield.

3. Effect of distillation operation on product purity

After distillation operation, the purity of dipropylene glycol butyl ether has been significantly improved. The experimental results show that the distillation operation can effectively remove the impurities in the crude product and improve the purity of the product.

Conclusion

This study introduces a method of manufacturing dipropylene glycol butyl ether by esterification reaction catalyzed by acid catalyst with propylene glycol and butanol as raw materials. The method has the advantages of simple operation, mild reaction conditions and high product purity. The process parameters such as reaction temperature and catalyst dosage were optimized by single factor experiments, and the yield and purity of dipropylene glycol butyl ether were further improved. This study provides a useful reference for the manufacture of dipropylene glycol butyl ether in industrial production.

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