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A kind of 2,2-dimethyl-1,3-propanediol rectification process

A technology of propylene glycol and dimethyl, which is applied in the field of 2,2-dimethyl-1,3-propanediol rectification technology, can solve the problems of high content of ester impurities, complicated operation and high cost, and achieve the reduction of acid value, Efficient hydrolysis and performance improvement

Active Publication Date: 2021-03-23
BEIJING HEYIJITONG TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the defects of complex operation, high cost, low efficiency and high content of ester impurities in the refining process of 2,2-dimethyl-1,3-propanediol in the prior art, thereby Provide a 2,2-dimethyl-1,3-propanediol rectification process

Method used

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  • A kind of 2,2-dimethyl-1,3-propanediol rectification process

Examples

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Effect test

Embodiment 1

[0028]A 2,2-dimethyl-1,3-propanediol rectification process, the 2,2-dimethyl-1,3-propanediol crude product is continuously sent into the rectification tower at a speed of 1000 kg / hour, Continuously introducing temperature at a rate of 3.3 kg / h into the rectifying tower is water at 40°C, and the mass ratio of the introduced water to the ester impurities in the crude product of 2,2-dimethyl-1,3-propanediol is 0.2: 1. The introduction position of water is in the stripping section of the rectification tower. There are 3 theoretical plates away from the feed inlet and 3 theoretical plates away from the tower kettle. Distill under pressure for 1 hour to separate and remove light components and ester impurities after hydrolysis. The effluent from the bottom of the tower is sent to the next rectification tower to separate and remove heavy components to obtain 2,2-dimethyl-1,3 -Propylene glycol end product.

Embodiment 2

[0030] A 2,2-dimethyl-1,3-propanediol rectification process, the 2,2-dimethyl-1,3-propanediol crude product is continuously sent into the rectification tower at a speed of 1000 kg / hour, Continuously introducing temperature at a rate of 20 kg / hour into the rectifying tower is water at 60°C, and the mass ratio of the introduced water to the ester impurities in the crude product of 2,2-dimethyl-1,3-propanediol is 1.2: 1. The introduction position of water is in the stripping section of the rectification tower. There are 12 theoretical plates away from the feed port and 8 theoretical plates away from the tower kettle. Distill under pressure for 3 hours to separate and remove the light components and ester impurities after hydrolysis. The effluent from the bottom of the tower is sent to the next rectification tower to separate and remove the heavy components to obtain 2,2-dimethyl-1,3 -Propylene glycol end product.

Embodiment 3

[0032] A 2,2-dimethyl-1,3-propanediol rectification process, the 2,2-dimethyl-1,3-propanediol crude product is continuously sent into the rectification tower at a speed of 1000 kg / hour, Continuously introducing temperature at a rate of 41.8 kg / h into the rectifying tower is water at 80°C, and the mass ratio of the introduced water to the ester impurities in the crude product of 2,2-dimethyl-1,3-propanediol is 2.5: 1. The introduction position of water is in the stripping section of the rectification tower. There are 12 theoretical plates away from the feed port and 12 theoretical plates away from the tower kettle. Distill under pressure for 2 hours to separate and remove the light components and ester impurities after hydrolysis. The effluent from the bottom of the tower is sent to the next rectification tower to separate and remove the heavy components to obtain 2,2-dimethyl-1,3 -Propylene glycol end product.

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Abstract

Provided is a rectification process of 2,2-dimethyl-1,3-propanediol, comprising rectifying 2,2-dimethyl-1,3-propanediol containing ester impurities, and introducing water during the process of rectification. The rectification process of 2,2-dimethyl-1,3-propanediol provided by the present invention facilitates the hydrolysis reaction of the ester impurities in 2,2-dimethyl-1,3-propanediol by introducing water into 2,2-dimethyl-1,3-propanediol containing ester impurities during the process of rectification. Alkali hydrolysis and extractant extraction are not required, thereby reducing equipment investment and operation costs, and the pressure is reduced, the safety is high, the content of ester impurities in 2,2-dimethyl-1,3-propanediol can be effectively reduced, the acid value of the final product can be reduced, and the product quality can be improved. The mass percentage of 2,2-dimethyl-1,3-propanediol in the final product is 99.2% or more, and this is also beneficial to the improvement of the properties of down-stream products.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a 2,2-dimethyl-1,3-propanediol rectification process. Background technique [0002] 2,2-Dimethyl-1,3-propanediol is an important polyol organic chemical product, mainly used in the production of unsaturated polyester resins, oil-free alkyd resins, polyester polyols and esters used in synthetic lubricants , polyurethane foam and elastomer plasticizers, additives for advanced lubricants and other fine chemicals. [0003] The production process of 2,2-dimethyl-1,3-propanediol is usually as follows: use organic tertiary amines such as trimethylamine and triethylamine as catalysts, and use formaldehyde and isobutylaldehyde as raw materials to obtain hydroxytertiary Valeraldehyde and hydroxypivalaldehyde are hydrogenated to obtain 2,2-dimethyl-1,3-propanediol. During the condensation reaction between formaldehyde and isobutyl aldehyde, a small amount of aldehyde raw materials will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/80C07C29/88C07C31/20
CPCC07C29/80C07C29/88C07C31/20
Inventor 崔龙赵莲于贺
Owner BEIJING HEYIJITONG TECH CO LTD
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