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Treatment method of dehydration in ethylene glycol production

A technology of ethylene glycol and dehydration tower, applied in the field of dehydration treatment in ethylene glycol production, can solve the problems of easy coking of reboilers, and achieve the effects of slow coking speed, slowing down coking speed and good economic effect.

Inactive Publication Date: 2007-12-26
CHINA HUANQIU CONTRACTING & ENG CO LTD
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Problems solved by technology

The present inventor has solved the problem that the reboiler of the dehydration tower is easy to coke in the prior art by adding a preheater before the dehydration tower

Method used

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  • Treatment method of dehydration in ethylene glycol production
  • Treatment method of dehydration in ethylene glycol production

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Embodiment Construction

[0038] The method of the present invention will be further described below by taking the flow shown in FIG. 2 as an example. The scope of the present invention is not limited by the examples, and the scope of the present invention is set forth in the claims.

[0039] As shown in Figure 2, a preheater is added to the feed pipeline of the dehydration tower of the existing production device, and a tube-and-tube heat exchanger is used for heating with medium-pressure steam of about 1.0MpaG (gauge pressure). The number of trays in the dehydration tower is 30, the temperature at the top of the tower is 60-65°C, the temperature at the bottom of the tower is 160-170°C, and the pressure inside the tower is 20-40kPa.

[0040] The concentrated ethylene glycol aqueous solution obtained from the final effect evaporator is introduced into the preheater and heated to its bubble point temperature, 140°C; then the ethylene glycol aqueous solution is introduced from the 16th to 18th plates of t...

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Abstract

The invention discloses a method for dewatering treatment in glycol preparation. Wherein, heating the concentrated glycol aqueous solution obtained from multi-effect evaporation system in a preheater to its bubble point or higher; in dewatering tower, taking dewater treatment. This invention solves the problems of reboiler coking, prolongs service lifetime, and can increase the tower load more than 30% by adding a little piece of devices.

Description

technical field [0001] The invention relates to a method for producing ethylene glycol, in particular to a method for dehydration treatment in the production of ethylene glycol. Background technique [0002] Ethylene glycol (EG) is an important organic chemical raw material with a wide range of uses, mainly used in the production of polyester resin, and can also be directly used as a coolant and antifreeze. [0003] At present, the industrial preparation of ethylene glycol adopts the non-catalytic hydration process of direct hydration method, and is prepared by hydrolysis, dehydration and rectification of ethylene oxide. The method does not use a catalyst, the molar ratio of reaction feed water and ethylene oxide is 20-25: 1, the reaction temperature is 150-200° C., the reaction pressure is 0.8-2.0Mpa, and the conversion rate of ethylene oxide is close to 100%. Diol selectivity is about 88%. During the reaction, since the reactivity of ethylene glycol and ethylene oxide is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/78
Inventor 黄耀相李红凯吉京华高全乐熊玉云
Owner CHINA HUANQIU CONTRACTING & ENG CO LTD
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