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Method for producing polyether polyols

A polyether polyol and a manufacturing method technology, which are applied in the field of manufacture of polyether polyol compounds, can solve the problems of difficult propel-stop, reduced reboiler performance, unstable state reaction and the like, and achieve the effect of stable manufacture

Active Publication Date: 2007-11-28
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the present inventors have found that in the reaction of synthesizing polyether polyol compounds by alcoholysis of diesters of polyether polyols and alkanols, the alkanes contained in the polyalkylene polyols produced When alcohols are recovered and reused, the following phenomena occur: it is difficult to advance and stop the reaction (cutting), the performance of the reboiler equipped in the reactor gradually decreases, and it becomes impossible to react in a stable state, etc.

Method used

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  • Method for producing polyether polyols

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Embodiment 1

[0078] The PTME prepared by the above method was added to the raw material tank 1, methanol containing 200 ppm of water was added to the raw material tank 2, and a methanol solution of 25% by mass sodium methoxide was added to the raw material tank 3. Considering the difference in the molecular weight of the terminal group, the molecular weight of PTME was calculated from the molecular weight of the finally obtained PTMG, and the calculated result was 1815. With 310 parts by mass / hour, the liquid of the raw material tank 2 and the distillate of the tank type reboiler 9 are supplied to the middle section of the distillation tower 10 (the top of the tower is equipped with a reflux device, the bottom of the tower is equipped with a reboiler, and the number of plates is 25 floors). Under normal pressure, the flow rate of the heat medium serving as the heating source of the reboiler was adjusted so that the reflux ratio became 2.6, and the distillation column 10 was operated. Wate...

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Abstract

A process for stably producing a polyether polyol compound by converting a diester of a polyether polyol to a polyether polyol compound while inhibiting deposition on the inner wall of the reactor. The process for polyether polyol compound production comprises conducting the alcoholysis reaction of a diester of a polyether polyol with a C1-4 alkanol in the presence of an alkali-metal alkoxide catalyst to convert the diester into a polyether polyol compound, and is characterized in that the C1-4 alkanol contained in the polyether polyol compound yielded is returned to the reaction system while keeping the water content in the alkanol at 100 ppm or lower.

Description

technical field [0001] The present invention relates to a method for producing polyether polyol compounds. In detail, the present invention relates to in the presence of transesterification catalyst by with C 1 ~C 4 The alcoholysis reaction of alkanols converts the diesters of polyether polyols into polyether polyols. Background technique [0002] Polyether polyol compounds such as polyalkylene ether glycols can be used as soft segments of polyester resins, polyurethane resins, and the like. In addition, these are processed into industrial products such as rolls, shoe soles, elastic fibers for clothing, etc., and are widely used in daily life. As a method for producing polyalkylene ether glycol, for example, a method (see Patent Document 1) is known in which a cyclic ether is subjected to ring-opening polymerization in the presence of an acid catalyst and a carboxylic anhydride such as acetic anhydride, After obtaining a dicarboxylate of polyalkylene ether glycol, the di...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/30
CPCC08G65/331C08G65/30
Inventor 竹尾弘
Owner MITSUBISHI RAYON CO LTD