Method for continuously preparing polyester polyol and device used in method

A technology for polyester polyol and polyol, applied in the field of polyester polyol, can solve the problems of high energy consumption and long time-consuming synthesis process, and achieve the advantages of increasing the reaction contact surface, facilitating continuous feeding, and increasing the contact area. Effect

Inactive Publication Date: 2013-10-09
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the shortcomings of long time-consuming and high energy consumption of the synthesis process in the prior art, the present invention provides a method for continuously synthesizing polyester polyols and the device used. First, the raw materials are fluidized and then reacted. The reaction is sufficient and the time is short. Short, low energy consumption, and can achieve continuous production

Method used

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  • Method for continuously preparing polyester polyol and device used in method

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Effect test

Embodiment 1

[0025] Raw materials: terephthalic acid, diethylene glycol, glycerin, catalyst;

[0026] Diethylene glycol, glycerin and terephthalic acid with a molar ratio of 1:0.2:1 are refined and injected into the raw material tank, and the heat preservation and stirring are started to prevent sedimentation. The reactor is filled with a feed pump and 0.03% of the catalyst is added. Raise the temperature and turn on the circulating pump to make the material circulate and react. When the water comes out from the top of the kettle, turn on the condensed water to keep the top temperature at 100-102°C; gradually raise the temperature to 260°C, and vacuumize from the water tank to gradually <0.09MPa; When the acid value of the material in the kettle drops to 1mgKOH / g, the feed pump and outlet can be turned on to realize continuous reaction.

Embodiment 2

[0028] Raw materials: terephthalic acid, diethylene glycol, neopentyl glycol, catalyst;

[0029] Refining diethylene glycol, neopentyl glycol and terephthalic acid with a molar ratio of 1:0.3:1 are poured into the raw material tank and turned on for heat preservation and stirring to prevent sedimentation. Fill the reactor with a feed pump and add 0.05% of Catalyst, heat up and turn on the circulating pump to make the material circulate and react, turn on the condensed water when the water comes out from the top of the kettle, keep the top temperature at 100-102°C; gradually increase the temperature to 260°C, vacuumize from the water tank, gradually <0.09MPa ; When the acid value of the material in the kettle drops to 1mgKOH / g, the feed pump and outlet can be opened to realize continuous reaction.

Embodiment 3

[0031] Raw materials: terephthalic acid, diethylene glycol, neopentyl glycol, catalyst;

[0032] Refining diethylene glycol, neopentyl glycol and terephthalic acid with a molar ratio of 1:0.3:1 are poured into the raw material tank and turned on for heat preservation and stirring to prevent sedimentation. Fill the reactor with a feed pump and add 0.05% of Catalyst, heat up and turn on the circulating pump to make the material circulate and react, turn on the condensed water when the water comes out from the top of the kettle, keep the top temperature at 100-102°C; gradually increase the temperature to 260°C, vacuumize from the water tank, gradually <0.09MPa ; When the acid value of the material in the kettle drops to 1mgKOH / g, the feed pump and outlet can be opened to realize continuous reaction.

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Abstract

The invention discloses a method for continuously synthesizing polyester polyol and a device used in the method. A solid raw material, namely acid or acid anhydride, and liquid polyol are used for synthesizing the polyester polyol in the presence of a catalyst. The method comprises the following steps of: preheating to melt the solid raw material for synthesizing the polyester polyol or slurrying in an alcoholic solution to obtain slurry, adding the catalyst, injecting the slurry into a slurry tank, metering by using a first metering pump, adding into a reaction kettle into which part of polyol is put in advance, starting a circulating pump to ensure that reaction liquid in the reaction kettle is circulated and fully reacted, and reacting according to the conventional steps under the conventional reaction conditions; and when an acid value is less than 1mgKOH / g, starting a second metering pump, continuously adding the polyol for reaction into the reaction kettle, continuously adding the slurry in the slurry tank into the reaction kettle, opening a discharge port at the upper end, and continuously discharging. The raw material is fluidized in advance, so that a high specific surface area and pipeline liquidity are achieved, and continuous feeding is facilitated.

Description

technical field [0001] The invention relates to a method for continuously synthesizing polyester polyols using a novel fluidized bed, and belongs to the technical field of polyester polyols. It specifically relates to the fluid state treatment of raw materials, the design of reaction bed and the synthesis process of polyester polyol. Background technique [0002] As we all know, polyester polyol polyurethane has more polar groups such as ester groups and amino groups in the molecule, and has strong cohesive strength and adhesion, and has high strength and wear resistance. It is mostly used in the production of cast polyurethane elastomer, thermoplastic polyurethane elastomer, microporous polyurethane sole, PU leather resin, polyurethane adhesive, polyurethane ink and color paste, fabric coating, etc. Aromatic polyester polyols refer to polyester polyols obtained by polymerization of phthalic anhydride and diols or triols (EG, PG, DEG, DPG, TMP, NPG, MPD, BDO, HDO). The rin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/78
Inventor 蒋剑春李科许彬陈洁徐俊明陈水根
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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