Improved 2-ethyl hexyl acrylate producing process

A technology of ethylhexyl ester and acrylic acid, which is applied in the preparation of carboxylic acid esters, organic chemical methods, chemical instruments and methods, etc., and can solve problems such as interfering with distillation operations and reducing the environmental quality of production workshops

Inactive Publication Date: 2002-12-11
ATOFINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This emulsion may be attributed to 2-ethylhexyl acrylate polymer, which interferes with th...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 (comparison)

[0027] The esterification of acrylic acid with 2-ethylhexanol was carried out batchwise in a stirred reactor at 80° C. under reduced pressure in the presence of sulfuric acid as catalyst and hydroquinone as polymerization inhibitor.

[0028] The reaction crude (B1) thus constituted is neutralized in order to remove the acids present, namely 2-ethylhexyl acid sulfate, acrylic acid and traces of sulfuric acid. This neutralization reaction was carried out in a separate stirred reactor batchwise using 200 g of crude B1, and 4% by weight sodium carbonate solution (30 min at room temperature). Decantation was performed in a decanting ampoule. In this case, emulsification at the interface was seen upon decanting.

Embodiment 2-7

[0029] Embodiment 2-7 (the present invention)

[0030] The same reaction as in Example 1 was carried out, but an acrylic stabilizer and an aqueous phase stabilizer were used. These results are compiled in the table below:

[0031] Example

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PUM

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Abstract

According to the method of direct esterification of acrylic acid with 2-ethylhexanol catalyzed by sulfuric acid, 2-ethylhexyl acrylate is produced, and the esterified acrylic acid is stabilized with at least one stabilizer, said esterification followed by Base neutralizes the resulting crude reaction mixture (B1), the salt obtained enters the aqueous phase (A1) of said mixture, the organic phase (O1) and aqueous phase (A1) from this step are separated, and the organic phase (O1) is separated from the organic phase (O1) Recovery of 2-ethylhexyl acrylate. In order to suppress the emulsification that occurs during said neutralization, one or more stabilizers of acrylic acid other than hydroquinone are selected, otherwise stabilizing the aqueous phase of the process before and/or during neutralization.

Description

technical field [0001] This invention relates to an improved process for the production of 2-ethylhexyl acrylate by the direct esterification of acrylic acid with 2-ethylhexanol, the reaction being catalyzed by sulfuric acid. Background technique [0002] In this industrial process, in order to shift the reaction equilibrium, no solvent is added which azeotropically takes away the water of reaction, but this effect can be ensured by an excess of esterified alcohol (currently, 2-ethylhexanol), which It has the characteristics of forming an azeotropic mixture with water. [0003] According to the following esterification of sulfuric acid with 2-ethylhexanol, at the end of the batch-wise reaction step, almost all of the sulfuric acid was converted to the acidic sulfuric acid-2-ethylhexyl ester (Et2HexSO 4 H): [0004] <chemistry num="001"> <chem file="02120127_cml001.xml" / > < / chemistry> [0005] Therefore, after the reaction is finished, the reaction mi...

Claims

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Application Information

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IPC IPC(8): C07B61/00C07C67/08C07C67/58C07C67/60C07C67/62C07C69/003C07C69/54
CPCC07C67/08C07C67/62C07C69/54
Inventor A·里昂德尔J·贝萨勒姆
Owner ATOFINA
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