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Process for continuously producing dimethyl adipate through reaction-rectification method

A technology of dimethyl adipate and rectification method, which is applied in the field of continuous production of dimethyl adipate by reaction-rectification method, can solve the problems of low acid conversion rate, high energy consumption, low production capacity and the like, and achieves conversion High efficiency, simple production process and low pollution

Active Publication Date: 2014-11-05
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of reaction-distillation method to continuously produce the technology of dimethyl adipate, to overcome the problems such as low conversion rate of acid, high energy consumption, low production capacity and serious pollution in the original technology

Method used

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  • Process for continuously producing dimethyl adipate through reaction-rectification method

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Embodiment 1

[0017] A kind of new process of producing dimethyl adipate of the present invention adopts a rectifying tower to be equipped with three reaction kettles to be concretely implemented, and the raw material of every kettle is 2.1kg methanol, 2.6kg adipic acid, 0.2kg catalyst; The reaction kettle adopts low pressure Steam heating, heating temperature 105°C; steam is introduced from the middle and upper part of the rectification tower; the bottom of the rectification tower is also heated by low-pressure steam, and the heating temperature is 130°C; an appropriate amount of distilled water is added to the bottom of the rectification tower in advance; the top of the tower is condensed with condensate ; The reflux ratio is 4. Operate according to the three-pot operation method mentioned above. After stabilization, the acid values ​​of each pot after 8 hours of de-alcoholization of the pot liquid are all less than 10.

Embodiment 2

[0019] A kind of new process of producing dimethyl adipate of the present invention adopts a rectifying tower to be equipped with three reaction stills to be concretely implemented, and the raw material of every still is 4.2kg methanol, 2.6kg adipic acid, 0.4kg catalyst; The reaction still adopts low pressure Steam heating, heating temperature 105°C; steam is introduced from the middle and upper part of the rectification tower; the bottom of the rectification tower is also heated by low-pressure steam, and the heating temperature is 130°C; an appropriate amount of distilled water is added to the bottom of the rectification tower in advance; the top of the tower is condensed with condensate ; The reflux ratio is 5. Operate according to the operation mode of three kettles. After stabilization, the acid values ​​of each kettle are less than 10 after 6 hours of dealcoholization of the kettle liquid.

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Abstract

The invention discloses a process for continuously producing dimethyl adipate through a reaction-rectification method. An involved device mainly comprises a rectification tower containing a reboiler and a condenser and a plurality of reaction kettles; and during reaction, methanol and water in a reaction system are evaporated, vapor is separated and purified through the rectification tower, moisture is discharged from the tower and the kettles, and the methanol is returned from the top of the tower to the reaction kettles, so that the moisture is continuously carried out of the reaction system, and esterification reaction finally tends to completeness. The process ensures the feed composition of the rectification tower and the relative stabilization of the flow, thereby ensuring that the rectification tower is stable in operation, favorable in separation effect, simple and stable to operate, low in energy consumption and favorable in product quality.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a process for continuously producing dimethyl adipate by a reaction-distillation method. Background technique [0002] Dimethyl adipate is a colorless transparent liquid with a high boiling point, easily soluble in alcohol and ether, but insoluble in water. It is an important non-volatile solvent, which has been widely used in high-grade coatings, synthetic resins, cleaning agents, inks and other products. It is also a good cold-resistant plasticizer, which can endow products with excellent low-temperature flexibility. At the same time, it is also an important intermediate for the hydrogenation of dibasic acids to produce fine chemicals such as dibasic alcohols. [0003] Since adipic acid reacts with methanol to generate dimethyl adipate and water, the reaction is a reversible reaction. When the reaction reaches equilibrium, the conversion rate of the acid will not c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/44C07C67/08C07C69/40C07C69/42
Inventor 郑辉东王碧玉赵素英王莹淑
Owner FUZHOU UNIV
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