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Prepn. process and apparatus of polytetramethylene ether glycol

The technology of a polytetramethylene ether glycol and a monitoring device is applied in the field of preparing polytetramethylene ether glycol, and can solve the problems of uneconomical, large space of the settling tank and the like

Inactive Publication Date: 2003-01-08
中国中化股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] Although a tubular high-speed centrifuge suitable for separating emulsions has been available for a long time, in the existing one-step process for producing PTMEG, it is still customary to use the precipitation method to separate the catalyst and the organic phase, and the precipitation separation is not only uneconomical, but also A huge settling tank requires a large space, which is also contrary to China's national conditions

Method used

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  • Prepn. process and apparatus of polytetramethylene ether glycol
  • Prepn. process and apparatus of polytetramethylene ether glycol
  • Prepn. process and apparatus of polytetramethylene ether glycol

Examples

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Embodiment 1

[0089] Embodiment 1: prepare PTMEG technology and the control of PTMEG molecular weight in reactor

[0090] Towards figure 1 and figure 2 Add 200Kg THF in the shown reactor 1 with external circulation, 100Kg contains 12 tungstophosphoric acid catalysts of 3-5 crystal waters, after opening the agitator 1-2, start to slowly add process water (0.2kg / min), while Open the external circulation system and open the valves 1-8 and 1-9, the molecular weight monitoring device participates in the circulation, after 2.5 minutes, stop adding water, close the valves 1-8, 1-9. After 1 minute, the reaction material is in the expansion body 7-2 Automatic stratification in the middle, the lower part is the catalyst phase, and the upper part is the organic phase containing dissolved catalyst and unreacted tetrahydrofuran. The conductivity meter is inserted into the organic phase to measure the conductivity at the initial stage. If the conductivity is less than 8ms / cm (corresponding to the con...

Embodiment 2

[0091] Embodiment 2. extractor and extraction process thereof

[0092] To a traditional extractor (without a central draft tube and a lower settling zone, e.g. Handbook of Chemical Engineering, Part 5, Stirring and Mixing, Figure 4-3 on page 56, Liquid-liquid phase agitator for extraction, Chemical Industry Publishing House, December, 1985, the first edition of Beijing), and the extractor 4 of the present invention respectively add 30 liters of feed liquid at the bottom of the first flasher 3, the feed liquid consists of about 85wt% of PTMEG, 15wt% of tetrahydrofuran and a trace amount of The impurity such as the catalyst of dissolving, add 60kg toluene extractant respectively to two extractors, traditional extractor temperature control 65 ℃, extractor temperature control 60 ℃ of the present invention. After the traditional extractor was stirred for 1.5 hours, the precipitated catalyst phase was discharged in a controlled manner from the bottom of the extractor, and the stirri...

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Abstract

The invention refers to a method of preparing the polymeric tetramethylene ether glycol (PTMEG), and the method which uses the mixed polyacid as the catalyst, makes the tetrahydrogenic furan initiate the open-loop polymerization by the positive ions, and gets the products of polymeric tetramethylene ether glycol (PTMEG) of the specific relative molecular weight, jand the extraction technique adopts the new-type extracting agent toluene and the equipment realizing the above mentioned method has the reactor of the external-cycled detecting system of the molecular weight, the pilot-flow board, the middle pilot-flow tube and the extractor in the bottom subsidence region. It can produce the PTMEC whose molecular weight and molecular weight distribution accord with the requirements, by giving the protons in the reactor strict monitoring for the body water yield.

Description

1. Technical field [0001] The invention relates to a method for preparing polytetramethylene ether glycol (PTMEG). Specifically, a heteropolyacid is used as the main catalyst, and tetrahydrofuran is used to initiate ring-opening polymerization through cations. By monitoring the distribution of molecular weight in the polymerization process, to obtain The polytetramethylene ether glycol (PTMEG) product of specific relative molecular weight, the present invention also relates to the device that realizes above-mentioned method in addition. [0002] Polytetramethylene ether glycol, referred to as PTMEG, scientific name polytetramethylene ether glycol, also known as polytetrahydrofuran or tetrahydrofuran homopolyether, is the production of high-performance block polyether polyurethane, polyether ester elastomer, polyether It is an important raw material for amides, thermoplastic polyurethanes and cast elastomers, and is widely used in the fields of synthetic leather, elastomers, co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/20
Inventor 范天民武尉山秀丽
Owner 中国中化股份有限公司
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