Method for preparing dipropyl adipate

A technology of di-n-propyl adipate and adipic acid, which is applied in the field of organic compound preparation, can solve problems such as unfavorable economic benefits, difficulty in reducing costs, and low production efficiency, and achieve product quality assurance, simple process, and convenient operation Effect

Inactive Publication Date: 2010-11-24
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 2

[0024] A method for preparing di-n-propyl adipate, comprising the following steps:

[0025] (1) Esterification step: drop into 100 kilograms of adipic acid, 85 kilograms of n-propanols, 0.3 kilograms of concentrated sulfuric acid successively in a 300-liter reactor with heating device, electric stirring, thermometer water circulation condenser and oil-water separator , heated to boiling reaction while stirring, kept boiling reflux state, continuously separated water from the oil-water separator, until no water was generated, stopped heating, and the esterification reaction was terminated.

[0026] (2) Water washing step: add 50 kilograms of water to the mixed solution obtained after the esterification reaction, stir evenly, leave to stand for stratification, and remove the water layer therein.

[0027] (3) Refining step: add 0.6 kg of refining agent (calcium oxide, magnesium oxide, activated carbon, silicon dioxide mixture, its weight ratio 1:1:2:1) to the mixed solution after...

Embodiment 3

[0030] A method for preparing di-n-propyl adipate, comprising the following steps:

[0031] (1) Esterification step: drop into 100 kilograms of adipic acid, 85 kilograms of n-propanols, 0.3 kilograms of concentrated sulfuric acid successively in a 300-liter reactor with heating device, electric stirring, thermometer water circulation condenser and oil-water separator , heated to boiling reaction while stirring, kept boiling reflux state, continuously separated water from the oil-water separator, until no water was generated, stopped heating, and the esterification reaction was terminated.

[0032] (2) Water washing step: add 50 kilograms of water to the mixed solution obtained after the esterification reaction, stir evenly, leave to stand for stratification, and remove the water layer therein.

[0033] (3) Refining step: add 0.7 kg of refining agent (calcium oxide, magnesium oxide, activated carbon, silicon dioxide mixture, its weight ratio 1:1:2:1) to the mixed solution after...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/44C07C67/08C07C67/56
Inventor 张富强
Owner TIANJIN CHEM REAGENT RES INST
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