Improved method of preparing acrylic acid-2-ethyl caproite

A technology of ethylhexyl ester and acrylic acid, which is applied in the preparation of carboxylate, organic chemistry methods, chemical instruments and methods, etc., can solve the problems of interfering with distillation operations and reducing the environmental quality of production workshops.
CN1379015AInactive Publication Date: 2002-11-13ATOFINA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ATOFINA
Publication Date
2002-11-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

Production of 2-ethylhexyl acrylate involves esterification of acrylic acid with 2-ethylhexanol. The esterification produces a reaction mixture (B1) comprising 2-ethylhexyl acrylate, 2-ethylhexanol, acrylic acid, 2-ethylhexyl acid sulfate, traces of sulfuric acid and impurities. (B1) is washed in a column enabling separation of an organic phase from which 2-ethylhexyl acrylate is distilled off. Production of 2-ethylhexyl acrylate involves esterification of acrylic acid with 2-ethylhexanol. The esterification produces a reaction mixture (B1) comprising 2-ethylhexyl acrylate, 2-ethylhexanol, acrylic acid, 2-ethylhexyl acid sulfate, traces of sulfuric acid and impurities. The mixture (B1) is water washed in a column enabling separation of an organic phase at the head and elimination of an aqueous phase at the foot. The organic phase is directed to a heading column from which acrylic acid and 2-ethylhexanol can be recycled to the esterification reaction, and 2-ethylhexyl acrylate from the base directed to another distillation column and headed off free from heavy products. The aqueous phase is directed to a hydrolysis stage to hydrolyse the acid sulfate, the acid species resulting being neutralized with a base. The resulting aqueous phase passes to a distillation column to separate off remaining 2-ethylhexanol which is recycled to the reaction.
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Description

technical field

[0001] This invention relates to an improved process for the preparation of 2-ethylhexyl acrylate by the direct esterification of acrylic acid with 2-ethylhexanol, which reaction can be catalyzed by sulfuric acid. Background technique

[0002] In this industrial process, in order to shift the reaction equilibrium, instead of adding solvent which is brought into the water of reaction by azeotropic action, an excess of esterified alcohol (currently, 2-ethylhexyl ester) is used to ensure this effect, This alcohol has the property of forming an azeotropic mixture with water.

[0003] After the discontinuously carried out reaction step, nearly all of the sulfuric acid can be converted to the acidic form of 2-ethylhexyl sulfate (Et2HexSO 4 H):

[0004] <chemistry num="001"> <chem file="02119216_cml001.xml" / > < / chemistry>

[0005] Therefore, the reaction mixture after the reaction includes 2-ethylhexyl acrylate, 2-ethylhexanol, acrylic acid,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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