High-production-efficiency polytetramethylene ether glycol preparation method
A polytetramethylene ether glycol and production efficiency technology, which is applied in the field of high production efficiency polytetramethylene ether glycol preparation, can solve the problem that the polymerization efficiency of polytetramethylene ether glycol has not been studied in depth Improvements and other issues to achieve fast and efficient recycling
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[0071] A method for preparing polytetramethylene ether glycol with high production efficiency, comprising the following steps:
[0072] 1) The tetrahydrofuran and the heteropolyacid catalyst added with diethyl ether are fully mixed through the intensified disperser, and the temperature is maintained at 50~52 ℃ and then enters the main reactor for polymerization reaction; the intensified disperser is followed by static mixing from bottom to top. It consists of a section, a distribution plate and a circulating heat exchange section.
[0073] 2) The catalyst settled in the main reaction kettle is sent out and recycled from the bottom of the kettle, and the obtained reaction solution is discharged from the top of the kettle and then enters the first-level centrifuge, and most of the catalysts are separated and recycled by centrifugal action.
[0074] 3) The remaining reaction solution enters the first distillation column to remove most of the tetrahydrofuran and all ether, and the...
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[0091] Example 1
[0092] A method for preparing polytetramethylene ether glycol with high production efficiency, comprising the following steps:
[0093] 1) The tetrahydrofuran and the heteropolyacid catalyst added with diethyl ether are fully mixed through the intensified disperser, and the temperature is maintained at 50~52 ℃ and then enters the main reactor for polymerization reaction; the intensified disperser is followed by static mixing from bottom to top. It consists of a section, a distribution plate and a circulating heat exchange section. The heteropolyacid catalyst is micron phosphotungstic heteropolyacid, and the volume content of the catalyst in the reaction solution is 38%. The content of ether in the tetrahydrofuran is 1.5 wt%, the moisture of the organic phase in the system is 0.3%, and the charging coefficient of the main reaction kettle is 100%.
[0094] 2) The catalyst settled in the main reaction kettle is sent out and recycled from the bottom of the ket...
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[0100] Example 2
[0101] A method for preparing polytetramethylene ether glycol with high production efficiency, comprising the following steps:
[0102] 1) The tetrahydrofuran and the heteropolyacid catalyst added with diethyl ether are fully mixed through the intensified disperser, and the temperature is maintained at 50~52 ℃ and then enters the main reactor for polymerization reaction; the intensified disperser is followed by static mixing from bottom to top. It consists of a section, a distribution plate and a circulating heat exchange section. The heteropolyacid catalyst is a phosphotungstic heteropolyacid, and the volume content of the catalyst in the reaction solution is 35%. The content of ether in the tetrahydrofuran is 1wt%, and the charging coefficient of the main reactor is 100%.
[0103] 2) The catalyst settled in the main reaction kettle is sent out and recycled from the bottom of the kettle, and the obtained reaction solution is discharged from the top of the...
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