Method for preparing dipropyl adipate

Abstract

The invention relates to a method for preparing dipropyl adipate, which comprises the following steps of: (1) esterification: putting adipic acid, normal propyl alcohol and concentrated sulfuric acid into a kettle, stirring, heating for boiling reaction, and keeping the boiling reflux condition to separate water from the mixture; (2) washing: adding water into the esterified mixture, stirring uniformly, standing for demixing, and removing a water layer; (3) refining: adding a refining agent which is prepared by mixing calcium hydroxide, magnesium hydroxide, activated carbon and magnesium sulfate according to a weight ratio of 1:1:2:1 into the washed mixture, stirring and refining for 1 hour; and (4) filtration: filtering the refined mixed liquor to prepare a dipropyl adipate product. In the preparation method, a high-vacuum refining step is saved and the input of high-vacuum pump equipment is avoided during production, so the equipment investment is saved, the production cost is reduced, and the market competiveness of the product is improved.

Description

technical field [0001] The invention belongs to the field of organic compound preparation, in particular to a method for preparing di-n-propyl adipate. Background technique [0002] In industrial production and military production, di-n-propyl adipate is used more and more widely as an important organic compound. The usual production method of di-n-propyl adipate is direct esterification, and the color of the obtained product is yellow, which is difficult to sell as a product, and must be further refined, that is, to carry out a decompression refining treatment step. The problems that this preparation method exists are: 1, because need to use expensive high-vacuum pump to realize in the decompression refining treatment step, therefore, this method exists the problem of many production equipments, high cost, thus is difficult to reduce cost; 2, because The decompression refining treatment step is an indispensable and time-consuming production step in the production process o...

AI Technical Summary

Problems solved by technology

The problems that this preparation method exists are: 1, because need to use expensive high-vacuum pump to realize in the decompression refining treatment step, therefore, this method exists the problem of many production equipments, high cost, thus is difficult to reduce cost; 2, because The decompression refining treatment step is an indispensable and time-consuming production step in the production process of di-n-propyl adipate. Therefore, this method has the problems of long production time and low production efficiency, which is not conducive to the improvement of economic benefits of enterprises.