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Continuous esterification reaction system, production method of dimethyl adipate and application

A technology of dimethyl adipate and esterification, applied in chemical instruments and methods, separation/purification of carboxylic acid esters, separation methods, etc., can solve problems such as high energy consumption and increased production costs, and reach a broad market foreground effect

Pending Publication Date: 2022-03-15
岳阳职业技术学院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a kind of continuous esterification reaction system, to solve the existing continuous esterification method for the production of dimethyl adipate proposed in the above-mentioned background technology needs to carry out unreacted methanol vapor during the reaction process Repeated cooling and heating, there is a problem of high energy consumption and increased production costs

Method used

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  • Continuous esterification reaction system, production method of dimethyl adipate and application
  • Continuous esterification reaction system, production method of dimethyl adipate and application
  • Continuous esterification reaction system, production method of dimethyl adipate and application

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Embodiment 1

[0062] A kind of production method of dimethyl adipate, comprises the following steps: adopt above-mentioned continuous esterification reaction system (but membrane drier 7 is not provided with), transport by the product that the intermittent esterification method reacts 4 hours to generate after filtration To the material tank 5, as the pre-esterification liquid (the conversion rate of adipic acid in the pre-esterification liquid is 73.5%) is heated by the material preheater 8, and the heating temperature is 95°C. The pre-esterification liquid is added from the top of the esterification tower 4 according to the flow rate of 4L / h. Use a hydraulic diaphragm metering pump to pump methanol into the methanol vaporizer 3 at a flow rate of 9L / h, heat it to 99°C and then enter the esterification tower 4 in the same direction as the pre-esterification liquid. After 2 hours of reaction, the liquid level of the dimethyl adipate buffer tank of the esterification tower 4 began to appear. ...

Embodiment 2

[0064]A kind of production method of dimethyl adipate, comprises the following steps: adopt above-mentioned continuous esterification reaction system (membrane drier 7 is provided with), by the product filtration that batch esterification method generates for 4 hours after conveying to The material tank 5 is heated by the material preheater 8 as a pre-esterification liquid (the conversion rate of adipic acid in the pre-esterification liquid is 73.5%), and the heating temperature is 95°C. The pre-esterification liquid is added from the top of the esterification tower 4 according to the flow rate of 4L / h. Esterification tower 4 is 2000mm high, and the path is 240mm, and distributor is equipped with at the upper end, and catalyst addition is 5kg. Use a hydraulic diaphragm metering pump to pump methanol into the methanol vaporizer 3 at a flow rate of 9L / h, heat it to 99°C and then enter the esterification tower 4 in the same direction as the pre-esterification liquid. After react...

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Abstract

The invention relates to the technical field of chemical processes, and particularly discloses a continuous esterification reaction system and a production method and application of dimethyl adipate, a continuous methanol separation system comprises a continuous esterification tower and a methanol raw material tank, the methanol raw material tank is used for storing methanol, the end of the esterification tower is communicated with a material tank used for storing pre-esterification liquid, and the material tank is communicated with the esterification tower. The stored pre-esterification liquid can be conveyed into the esterification tower and is subjected to esterification reaction with methanol, the esterification tower is connected with a methanol preheater, and the output end of the methanol preheater is connected with a membrane dryer; according to the invention, unreacted methanol and generated water in the esterification tower are heated and evaporated out through the methanol preheater, and then are filtered and separated through the membrane dryer, so that water is removed, and the residual methanol flows back to the methanol raw material tank and can be continuously conveyed into the esterification tower for esterification reaction; the problems that an existing continuous esterification method for producing dimethyl adipate is high in energy consumption and production cost is increased are solved.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a continuous esterification reaction system, a production method and application of dimethyl adipate. Background technique [0002] Dimethyl adipate, also known as dimethyl adipate, is a colorless and transparent liquid that can be used as a plasticizer and a high-boiling solvent. It is mainly used in the industry to synthesize intermediates, medicines, spices, etc. An important raw material for the production of dimethyl nylon acid and 1,6-hexanediol. [0003] According to literature reports, the current mainstream production method of dimethyl adipate is the continuous esterification method, which mainly includes the following steps: 1) adding methanol and a strong acid resin catalyst into the reactor, and the temperature of the reactor is raised to 75°C Then add solid adipic acid and react under the condition of slightly positive pressure. During the reaction pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00B01D1/00B01D53/22C07C67/08C07C67/48C07C69/44
CPCB01J19/00B01D1/00B01D53/22C07C67/08C07C67/48C07C69/44
Inventor 余珺
Owner 岳阳职业技术学院
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