US 2014/0275313 A1 · METHOD TO INCREASE THE RESISTANCE OF DOUBLE METAL CYANIDE CATALYSTS TO DEACTIVATION

Abstract

This invention relates to a semi-batch process for the production of polyoxyalkylene polyether polyols. These polyoxyalkylene polyether polyols have hydroxyl (OH) numbers of from 112 to 400. This process comprises establishing oxyalkylation condition in a reactor in the presence of a DMC catalyst, continuously introducing alkylene oxide and a suitable starter into the reactor, and recovering an oxyalkyated polyether polyol. The oxyalkylation initially occurs at a temperature that is sufficiently high enough to avoid or prevent deactivation of the DMC catalyst, or for from 2% to 50% of the total oxide feed amount, and the oxyalkylation is then continued at a lower temperature.

Claims13

Dependent claims

A semi-batch process for the production of a polyoxyalkylene polyether polyol having an OH number of from 112 to 400, comprising:

(1) establishing oxyalkylation conditions in an oxyalkylation reactor in the presence of a double metal cyanide catalyst;
(2) continuously introducing alkylene oxide and a low molecular weight starter into said reactor, said starter having a number average molecular weight of from 30 to 200;
and
(3) recovering an oxyalkylated polyether polyol from the reactor;
wherein said oxyalkylation initially occurs at a sufficiently high temperature for up to about 60 minutes and for between 2% and 50% of the total oxide feed amount, and then continuing the oxyalkylation at a temperature in the range of from 120° C. to 135° C.

2 more elements

Dependencies are inferred from the claim text.

Method to increase the resistance of double metal cyanide catalysts to deactivation

Life of this patent

Method to increase the resistance of double metal cyanide catalysts to deactivation

Life of this patent

Abstract

Claims13