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Method for manufacturing polyol esters

A technology of polyol esters and polyols, which is applied in the field of preparing polyol esters, and can solve problems such as acid quality damage

Active Publication Date: 2011-04-27
OXEA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this is in conflict with the fact that, with increased reuse, acid quality suffers due to by-product formation and enrichment, so that recovered aliphatic monocarboxylic acids must be at least partially eventually drained and replaced with fresh acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Preparation of triethylene glycol di-2-ethylhexanoate (3G8 ester); esterified with fresh in the presence of activated carbon

[0060] The esterification of triethylene glycol and 2-ethylhexanoic acid was carried out in a heatable 1-liter four-necked flask equipped with a stirrer, internal thermometer and water separator.

[0061] The flask was initially charged with 250 grams (1.66 moles) of triethylene glycol and 680 grams (4.72 moles) of fresh 2-ethylhexanoic acid and 0.4% by weight of activated carbon based on the total reaction mixture. While stirring and applying a slight reduced pressure of 900 hPa, the mixture was heated to 225°C. When this temperature is reached, the pressure is gradually reduced to 400 hPa, and the formed reaction water is removed on the water separator while allowing 2-ethylhexanoic acid to flow back to the reaction vessel. The progress of the reaction was monitored by continuously weighing the water discharged through the water separator and by t...

Embodiment 2

[0067] Preparation of triethylene glycol di-2-ethylhexanoate (3G8 ester); esterification in the presence of activated carbon and reuse of the intermediate fraction from the previous esterification batch

[0068] Example 2 was performed similarly to Example 1, with the only difference being that instead of fresh 2-ethylhexanoic acid, an intermediate fraction of 2-ethylhexanoic acid collected from the previous esterification batch was used.

Embodiment 3

[0069] Example 3 (comparative example):

[0070] Preparation of triethylene glycol di-2-ethylhexanoate (3G8 ester); esterification in the presence of activated carbon and reuse of all recovered acids from previous esterification batches

[0071] Example 3 was performed similarly to Example 2, except that instead of the 2-ethylhexanoic acid intermediate fraction, all the 2-ethylhexanoic acid recovered from the previous esterification batch was used.

[0072] The color numbers of the post-treatment triethylene glycol di-2-ethylhexanoate obtained according to Examples 1 to 3 are listed in Table 1 below. The ester content measured by gas chromatography is consistent with other indexes, such as residual acid content or water content.

[0073] Table 1: Color numbers of triethylene glycol di-2-ethylhexanoate prepared according to Examples 1, 2 and 3

[0074]

[0075] The method of the present invention to partially recycle the aliphatic monocarboxylic acid recovered in the esterification i...

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Abstract

The present invention relates to a process for preparing polyol esters by reacting polyols with linear or branched aliphatic monocarboxylic acids having 3 to 20 carbon atoms by partial recycling of the aliphatic monocarboxylic acid removed into the esterification reaction or into subsequent esterification batches.

Description

Technical field [0001] The present invention relates to a method for preparing polyol esters from linear or branched aliphatic monocarboxylic acids having 3 to 20 carbon atoms and polyols by converting starting compounds and partially recycling aliphatic monocarboxylic acids. Background technique [0002] Polyhydric alcohol (polyhydric alcohol) esters, also known as polyol esters, can be used on a large scale in industry for various purposes, such as plasticizers or lubricants. The selection of suitable raw materials can control physical properties, such as boiling point or viscosity, and take into account chemical properties, such as hydrolysis resistance or oxidative degradation stability. Polyol esters can also be adapted to specific performance problems. A detailed overview of the application of polyol esters can be found in, for example, Ullmann's Encyclopaedia of Industrial Chemistry, 5th edition, 1985, VCH Verlagsgesellschaft, Volume A1, pages 305-319; 1990, Volume A15, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/52C07C67/48C07C69/28
CPCC07C67/08C07C67/54C07C69/28
Inventor M·奥道米克T·米勒W·舒尔策H·J·舒尔策
Owner OXEA GMBH
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