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Method and device for continuous purification production of polyhydric alcohols

A production method and polyol technology, which are applied in the field of continuous refining and production of polyols, can solve the problems of poor product quality stability, cumbersome operation, low production efficiency, etc. rate effect

Inactive Publication Date: 2014-08-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyol (dipropylene glycol DPG, tripropylene glycol TPG) is a fine chemical product with a wide range of uses, and the market is very tight. Polyol is an important raw material for the synthesis of polyether. The market demand for polyether is very large, but Due to the constraints of the production process, the production scale of polyols is small and the quality is unstable, such as figure 1 As shown, the general polyol refining method adopts batch operation, a rectification tower, a reboiler is connected to the bottom of the tower, a sufficient amount of material is added at one time, the material in the reboiler is heated by a heat medium, and different temperature stages are controlled. To collect fractions of different distillation ranges, first dehydrate, then collect the front fraction, then collect the product, and finally collect the rear fraction. Since the distillation range crosses after decompression, in order to ensure the purity of the product, a part of the product must be lost between the front fraction and the rear fraction. In the fraction, it is also necessary to ensure precise operation
In order to improve the product yield, the latter fraction should be added to the reboiler for re-distillation. In this way, using this method, whether it is in terms of output, utility consumption, production operation, or product quality assurance, there is a big problem. Disadvantages: cumbersome operation, large consumption of public works, small output, poor product quality stability, therefore, the production efficiency is extremely low

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  • Method and device for continuous purification production of polyhydric alcohols
  • Method and device for continuous purification production of polyhydric alcohols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 12000

[0019] The polyalcohol continuous refining process of embodiment 12000 kilograms / hour

[0020] Pass the polyol crude raw material liquid into the feed port in the middle of the dehydration tower at a flow rate of 2000 kg / hour, and the water in the raw material liquid is discharged from the top of the dehydration tower, condensed by the condenser, and part of it is refluxed while the other part is extracted to waste water collection tank; the operating pressure at the top of the dehydration tower is 13KPa, the pressure difference between the top and the bottom of the tower is 1Kpa, the operating temperature at the bottom of the tower is 178°C, and the operating temperature at the top of the tower is 55°C; The material that goes out is sent into the feed port in the middle part of the propylene glycol tower with a flow rate of 1970 kg / hour and is partially heated by the reboiler at the bottom of the dehydration tower to form a gas phase and return to the tower, and the gas phase ...

Embodiment 21600

[0021] The polyalcohol continuous refining process of embodiment 21600 kilograms / hour

[0022]Pass the crude polyol raw material liquid into the feed port in the middle of the dehydration tower at a flow rate of 1600 kg / hour, and the water in the raw material liquid is discharged from the top of the dehydration tower, condensed by the condenser, and part of it is refluxed while the other part is extracted to waste water collection tank; the operating pressure at the top of the dehydration tower is 15KPa, the pressure difference between the top and the bottom of the tower is 3Kpa, the operating temperature at the bottom of the tower is 174°C, and the operating temperature at the top of the tower is 56°C; The material that goes out is sent into the feed port in the middle part of the propylene glycol tower with a flow rate of 1576 kg / hour and is partially heated by the reboiler at the bottom of the dehydration tower to form a gas phase and return to the tower, and the gas phase i...

Embodiment 31800

[0023] The polyalcohol continuous refining process of embodiment 31800 kilograms / hour

[0024] Pass the polyol crude raw material liquid into the feed port in the middle of the dehydration tower at a flow rate of 1800 kg / hour, and the water in the raw material liquid is discharged from the top of the dehydration tower, condensed by the condenser, and part of it is refluxed while the other part is extracted to waste water collection Can. The operating pressure at the top of the dehydration tower is 14KPa, the pressure difference between the top and the bottom of the tower is 2Kpa, the operating temperature at the bottom of the tower is 176°C, and the operating temperature at the top of the tower is 55.7°C; Material is sent into described propylene glycol tower middle part feed port with 1773 kilograms / hour flow rate and forms gaseous phase return in the tower after the tower bottom reboiler heating of part through dehydration tower, from described propylene glycol tower top ext...

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Abstract

The invention discloses a method and a device for continuous purification production of polyhydric alcohols. The device comprises a dehydrating tower, a propylene glycol tower, a dipropylene glycol tower and a tripropylene glycol tower which are sequentially connected. Tops of the dehydrating tower, the propylene glycol tower, the dipropylene glycol tower and the tripropylene glycol tower are connected with a condensing and refluxing device, the lower portions thereof are connected with a reboiler respectively, and the middle of each of the dehydrating tower, the propylene glycol tower, the dipropylene glycol tower and the tripropylene glycol tower is provided with a feed inlet. A discharge outlet at the bottom of the dehydrating tower is connected with the feed inlet of the propylene glycol tower through a pipeline connected with a cooler, a discharge outlet at the bottom of the propylene glycol tower is connected with the feed inlet of the dipropylene glycol tower through a pipeline, a discharge outlet at the bottom of the dipropylene glycol tower is connected with the feed inlet of the tripropylene glycol tower through a pipeline, and a discharge outlet at the bottom of the tripropylene glycol tower is in storage connection with reactor residual liquid through a pipeline. The method and the device for continuous purification production of polyhydric alcohols have the advantages that separation efficiency is improved, labor intensity of workers is alleviated, and discharge of pollutants is reduced.

Description

technical field [0001] The invention relates to a polyol continuous refining production method and device. Background technique [0002] Polyol (dipropylene glycol DPG, tripropylene glycol TPG) is a fine chemical product with a wide range of uses, and the market is very tight. Polyol is an important raw material for the synthesis of polyether. The market demand for polyether is very large, but Due to the constraints of the production process, the production scale of polyols is small and the quality is unstable, such as figure 1 As shown, the general polyol refining method adopts batch operation, a rectification tower, a reboiler is connected to the bottom of the tower, a sufficient amount of material is added at one time, the material in the reboiler is heated by a heat medium, and different temperature stages are controlled. To collect fractions of different distillation ranges, first dehydrate, then collect the front fraction, then collect the product, and finally collect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/42C07C43/11C07C29/80C07C31/20
Inventor 冯惠生王强夏明明刘叶凤徐菲菲
Owner TIANJIN UNIV