High water content tolerant process for the production of polyethers

A polyether and weight technology, applied in the field of polyether production, can solve problems such as unsatisfactory and achieve the effect of preventing deactivation

Inactive Publication Date: 2008-01-23
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Those skilled in the art realize that adding more catalyst is one way to overcome the water pollution problem, but this method has proved to be unsatisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Propoxylate of propylene glycol with a hydroxyl number of 112 containing 30 ppm DMC catalyst (catalyst prepared according to US Patent No. 5,482,908) was charged to a 1 gallon stainless steel reactor equipped with a mechanical stirrer and heated slowly. During heating, a vacuum was continuously drawn in the headspace and nitrogen gas was passed through the dip tube into the liquid phase. After the reactor temperature reached 130°C, vacuum and nitrogen were continued for 10 minutes. The nitrogen flow was stopped and the reactor pressure was closed at 1.5 psia. The first propylene oxide charge was added to the reactor within a few minutes. After 10 minutes, the pressure in the reactor dropped, indicating that the DMC catalyst was activated. The propylene oxide feed was resumed at a feed rate set at 27.5 g / min (equivalent to a 2 hour residence time). After the epoxide feed was established, a feed containing propylene glycol with 60 ppm phosphonic acid and 395 ppm DMC ca...

Embodiment 3

[0041] The reaction was started under similar starting conditions as described in Example 1, and with propylene glycol and a catalyst container containing: 197 ppm DMC catalyst, 60 ppm phosphoric acid and propylene glycol containing 589 ppm water. The concentration of DMC in propylene glycol was sufficient to provide a concentration of 30 ppm in the final product. Propylene oxide was added at a rate of 25.1 g / min and the propylene glycol / DMC catalyst mixture was added at a rate of 4.5 g / min, corresponding to a residence time of 2 hours. In a similar manner to Example 1, the polyether was continuously removed from the reactor and collected. The feed was continued for 21 hours at which point the reaction was stopped.

[0042] The collected product sample had a hydroxyl number of 210 mg KOH / gram and a viscosity of 98 cSt.

Embodiment 5

[0046] The reaction was started under similar starting conditions as described in Example 1, and with propylene glycol and a catalyst container containing: 395 ppm DMC catalyst, 120 ppm phosphoric acid and propylene glycol containing 2509 ppm water. Propylene oxide was added at a rate of 27.4 g / min and the propylene glycol / DMC catalyst mixture was added at a rate of 2.25 g / min, corresponding to a residence time of 2 hours. In a similar manner to Example 1, the polyether was continuously removed from the reactor and collected. The feed was continued for 21 hours at which point the reaction was stopped.

[0047] The collected product sample had a hydroxyl number of 108 mg KOH / gram and a viscosity of 170 cSt.

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Abstract

The present invention provides a process for the production of a polyether involving establishing oxyalkylation conditions in an oxyalkylation reactor in the presence of from about 5 ppm to about 1,000 ppm, based on the final polyether weight, of a double metal cyanide (DMC) catalyst, continuously introducing into the reactor at least one alkylene oxide and a low molecular weight starter having a number average molecular weight of less than about 300 Daltons (Da) containing from about 200 ppm to about 5,000 ppm water and acidified with from about 10 ppm to about 2,000 ppm of at least one of an inorganic protic mineral acid and an organic acid, and recovering a polyether product having a number average molecular weight of from about 200 Da to about 4,000 Da, wherein the ppm (parts per million) of water and acid are based on the weight of the low molecular weight starter. The inventive process may allow for the use of low molecular weight starters containing higher levels of water at lower DMC catalyst levels than current processes.

Description

technical field [0001] This invention relates generally to polyether production, and more particularly to an improved process for the production of polyethers by double metal cyanide ("DMC") catalysis from low molecular weight starters having high water contents. Background technique [0002] For many years, base-catalyzed alkoxylation has been used to prepare polyoxyalkylene polyols. In this method, a suitable hydroxyl-containing low molecular weight starter molecule, such as propylene glycol (" PG") alkoxylation to form a polyoxyalkylene polyether polyol product. Because low molecular weight starters can be used, the build ratio (build ratio (polyol weight / starter weight)) is high, so this method can be effectively Maximize the use of reactor capacity.Strong base catalysts such as sodium hydroxide or potassium hydroxide are usually used in this type of alkoxylation reaction. [0003] Accordingly, most polyoxyalkylene polyols useful in the synthesis of polyurethane polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/34
CPCC08G65/2663C08G18/4866C08G65/2696C08G65/12C08G65/26C08G65/00
Inventor J·R·利斯二世E·P·布朗J·F·帕佐斯
Owner BAYER MATERIALSCIENCE AG
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