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Method for circular filtration in production of adipic acid polyester polyols

An adipic acid polyester and circulating filtration technology is applied in the field of polyester polyol synthesis to achieve the effects of convenient and safe operation, simple filtration process and broad application prospects

Active Publication Date: 2015-04-22
SICHUAN LUTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature on this subject has not yet been published

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 450 kg of propylene glycol, 675 kg of adipic acid, and 1.25 kg of catalyst metal salt (potassium salt of phosphoric acid) into the reactor, turn on the vacuum, the vacuum gauge pressure is not greater than 0.05MPa, and heat to 130-140°C for 12 hours; Then raise the temperature to 160°C, and increase the vacuum to a vacuum degree of not less than 0.095MPa. After 2 hours of reaction, stop the heating of the heat transfer oil, turn on the cooling water of the heat transfer oil cooler, slowly open the heat transfer oil inlet and outlet valve of the heat transfer oil cooler, and use the heat transfer oil Cool the reactor with oil, lower the temperature of the material in the reactor to 100°C, start the circulating filtration process, reduce the speed of the agitator to 8Hz, close the inlet valve of the water ring vacuum pump, stop the water ring vacuum pump, open the nitrogen valve on the upper part of the reactor to break the vacuum, and The vacuum degree on the vacuum g...

Embodiment 2

[0032]Add 400 kg of propylene glycol, 600 kg of adipic acid, and 1.1 kg of catalyst metal salt (potassium phosphoric acid) to the reactor, turn on the vacuum, the vacuum gauge pressure is not greater than 0.05 MPa, and heat to 130-140 ° C for 12 hours; Then raise the temperature to 160°C, and increase the vacuum to a vacuum degree of not less than 0.095MPa. After 2 hours of reaction, stop the heating of the heat transfer oil, turn on the cooling water of the heat transfer oil cooler, slowly open the heat transfer oil inlet and outlet valve of the heat transfer oil cooler, and use the heat transfer oil Cool the reactor with oil, lower the temperature of the material in the reactor to 100°C, start the circulation filtration process, reduce the speed of the agitator to 8Hz, close the inlet valve of the water ring vacuum pump, stop the water ring vacuum pump, and break the vacuum of the reactor; open the reactor Bottom to all valves at the inlet of the oil filter, and the valve at ...

Embodiment 3

[0036] Add 350 kg of propylene glycol, 525 kg of adipic acid, and 0.96 kg of catalyst metal salt (potassium phosphoric acid) to the reactor, turn on the vacuum, the vacuum gauge pressure is not greater than 0.05 MPa, and heat to 130-140 ° C for 12 hours; Then raise the temperature to 160°C, and increase the vacuum to a vacuum degree of not less than 0.095MPa. After 2 hours of reaction, stop the heating of the heat transfer oil, turn on the cooling water of the heat transfer oil cooler, slowly open the heat transfer oil inlet and outlet valve of the heat transfer oil cooler, and use the heat transfer oil Cool the reactor with oil, lower the temperature of the material in the reactor to 100°C, start the circulation filtration process, reduce the speed of the agitator to 8Hz, close the inlet valve of the water ring vacuum pump, stop the water ring vacuum pump, and break the vacuum of the reactor; open the reactor Bottom to all valves at the inlet of the oil filter, and the valve a...

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PUM

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Abstract

The invention discloses a method for circulating filtration in production of adipic acid polyester polyols. According to the method, after a high-vacuum-degree dealcoholization process is finished, a plate and frame pressure type oil filter is used for circular filtration of a material so as to remove solid substances in an initial esterification reaction. After the mixed material is subjected to the circular filtration by the method disclosed by the invention, filtered materials is obviously improved in transparency and is proper in an acid value; solid impurities are greatly reduced; stable implementation of subsequent high-temperature polymerization reaction is facilitated; color darkening of polymerization products is obviously reduced; therefore, the method disclosed by the invention has a great significance for improving the quality of a final product.

Description

technical field [0001] The invention relates to the field of polyester polyol synthesis, in particular to a method for circulating filtration in the production process of adipic acid polyester polyol. Background technique [0002] Adipic acid polyester polyol is synthesized from raw materials such as adipic acid, low molecular weight polyol and catalyst under certain process conditions. It is one of the important raw materials for producing polyurethane materials. This product has excellent heat resistance and durability, good oil resistance and soapy water extraction resistance, and good low temperature usability. It also has good biodegradability and is one of the more promising industrial-grade environmental protection materials. Widely used in oil-resistant and high-temperature-resistant special products, such as oil-resistant hoses, high-temperature-resistant, high-humidity non-migrating cable materials, high-temperature-resistant wire covering layers, insulating mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/78
Inventor 宁忠培任春华李勇戴志谦蒋英熊斌林朝阳蒋弟勇
Owner SICHUAN LUTIANHUA