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Single reactors synthesis of KOH-capped polyols based on DMC-synthesized intermediates

一种多元醇、反应器的技术，应用在碱催化氧化乙烯封端制备多元醇领域，能够解决没有公开副产物最小化的方法等问题，达到低不饱和度的效果

Active Publication Date: 2005-07-13
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The US4110268 patent does not disclose a method of minimizing the presence of such by-products

Method used

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Examples

Experimental program
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Embodiment 1

[0049] A 29 liter stirred tank reactor was charged with a 701 Da triol having a hydroxyl number of 240 (1867.2 g). This triol contained 1 wt% bottoms from a previous reactor batch (an unpurified polyol still containing 0.5 wt% KOH). The starter was neutralized with a 5% excess of dodecylbenzenesulfonic acid (DDBSA). After neutralization, zinc hexacyanocobaltate catalyst (0.45 g) was added. After purging and evacuating with nitrogen, the catalyst was activated at 130° C. by adding propylene oxide (94 g) and ethylene oxide (11 g). The activation profile indicates the amount of activated oxide at this temperature. Next, propylene oxide (11539 g) and ethylene oxide (1339 g) were added and reacted at 130°C. Afterwards, a 45 wt% KOH aqueous solution (172 g) was added to the DMC-catalyzed polyol to form a mixture. The reactor was dried by holding at 125°C for 3 hours under a nitrogen sparge below 10 mmHg. Propylene oxide (900 g) was then added and traces of water were removed fr...

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Abstract

The present invention relates to a process for the preparation of ethylene oxide (EO) capped polyanols in which it is not necessary to remove catalyst residues or salts formed by neutralization of base catalysts before discharging the polyol from the reactor, which is This is because the neutralization occurs during or after the starter filling of the next batch. The method of the present invention may allow the preparation of DMC-catalyzed intermediates and their base-catalyzed EO capping in the same reactor. The polyols prepared by the method of the present invention have a high content of primary hydroxyl groups, and they can be used to prepare polyurethane foams, elastomers, sealants, coatings, adhesives and the like.

Description

technical field [0001] The invention mainly relates to catalysis, in particular to a method for preparing polyols in a single reactor by using a double metal cyanide (DMC) composite catalyst to catalyze an intermediate and base-catalyzed ethylene oxide (EO) capping. The process of the present invention does not require the removal of catalyst residues or salts formed by neutralization of the base catalyst from the reactor prior to charging the starter for the next polyol batch. The polyols produced by the process of the present invention have high levels of primary hydroxyl groups and inherently low levels of unsaturation. Background technique [0002] Ethylene oxide (EO)-terminated polyols are very important in the polyurethane industry because the primary hydroxyl groups of EO-terminated polyacids can advantageously react with polyisocyanates. Ethylene oxide-terminated polyols are usually prepared by a multi-step reaction. First, propylene oxide (PO) (or a mixture of PO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26C08G18/16C08G18/28C08G18/48C08G18/63C08G65/10C08G65/26C08G65/32C08G101/00
CPCC08G18/4841C08G18/4866C08G65/2648C08G65/2663C08G65/269C08G65/2696C08G18/16C08G18/185C08G18/22C08G18/28C08G18/4833C08G18/63C08G18/8003
Inventor B·D·考施瓦
Owner BAYER MATERIALSCIENCE AG
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