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Method for alkoxylisation with DMC catalysts in loop-type bubble column with eductor

A DMC catalyst and loop reactor technology, applied in the field of alkoxylation, can solve the problems of narrowing and unfavorable molar mass distribution, and achieve the effect of increasing safety

Inactive Publication Date: 2009-06-03
TH GOLDSCHMIDT AG
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Problems solved by technology

However, DMC catalysts are characterized in that, due to their high selectivity, after the end of the simultaneous addition of the alkylene oxide and the starting compound (e.g. alcohol), the molar mass distribution narrows considerably again during the subsequent addition of only the alkylene oxide
However, this may be disadvantageous for special applications

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  • Method for alkoxylisation with DMC catalysts in loop-type bubble column with eductor

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Embodiment Construction

[0032] The method of the present invention will now be described by way of example, and these illustrative embodiments are not intended to limit the scope of the invention in any way. When hereinafter a range, formula or compound type is mentioned, it shall include not only the corresponding range or group of compounds explicitly mentioned, but also all sub-ranges which may be obtained by selection of individual values ​​(ranges) or compounds and subclasses of Compound. When documents are cited in the context of this specification, the contents of said documents should be fully included in the disclosed content of the present invention. When the compounds described in the context of the present invention have different units that occur several times, the units may be distributed randomly (random oligomers) or in ordered form (block oligomers) in these compounds. )Appear. Statements relating to the number of units in a stated compound are to be understood as averages averaged...

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Abstract

The present invention relates to a method for alkoxylisation with DMC catalysts in loop-type bubble column with an eductor, in particular relates to a method for preparing a polyether compound of formula (R 1>-(CHR 2>CHR 3>-O) n-H) (I), wherein n is equal to an integer from 1 to 12000, R<1> is a group containing at least a carbon atom, R<2> and R<3> are H or alkyl separately, and the units marked by the subscript n are same or different (namely R<2> and R<3> group are same or different), comprises alkoxylation of a starting compound exhibiting R 1>in the presence of a double-metal-cyanide-catalyst (DMC catalyst) in a loop reactor, characterized in that the alkoxylation takes place in the loop reactor, over a jet suction-mixing nozzle (4), in which all the materials involved in the reaction or auxiliary material is mixed; and one alkylene oxide or several different alkylene oxide is added at the same time point (statistical addition) or at different time point (block addition), over the jet suction-mixing nozzle.

Description

technical field [0001] The invention relates to a process for alkoxylation in the presence of double metal cyanide catalysts (DMC catalysts) in a loop reactor with injectors (nozzles). Background technique [0002] Double metal cyanide catalysts (DMC catalysts) and their use for the preparation of polyether polyols have been known for a long time. In particular documents EP 0 868 468, EP 0 879 259, EP 0 981 407, EP 0971 970, EP 1 012 203, EP 1 017 738, EP 1 173 498, EP 1 254 714, EP 1 258291, EP 1 382 629 , EP 1 577 334 and WO 05 / 042616 and the documents cited therein describe in detail the preparation of DMC catalysts and their use, in particular in the preparation of polyethers by alkoxylation. The content of the documents mentioned is fully incorporated into the disclosure content of the present invention. [0003] Including the high reactivity, due to the high substrate selectivity of the DMC catalyst, it has the advantage that a very narrow molar mass distribution can...

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Application Information

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IPC IPC(8): C08G65/26
CPCC08G65/2615C08G65/2663C08G65/2609C08G65/2696
Inventor A·泽尔曼V·策尔默
Owner TH GOLDSCHMIDT AG
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