Process for refining butylacrylate

A technology of butyl acrylate and acrylate, applied in chemical instruments and methods, preparation of carboxylic acid esters, preparation of organic compounds, etc.

Inactive Publication Date: 2000-05-24
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This impurity gives butyl acrylate an odor

Method used

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  • Process for refining butylacrylate
  • Process for refining butylacrylate

Examples

Experimental program
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Embodiment 1

[0084] Embodiments of the invention employing dual reactors were demonstrated using a 7 liter reactor. mentioned in brackets figure 1 The units listed in are only to further illustrate the operation of this embodiment of the invention. However, this example includes figure 1 variants described in, but which are fully foreseen by the invention previously described. All starting material and reaction product amounts are approximate, resulting in a material balance of approximately ±5%

[0085] 589 g / h of acrylic acid and 580 g / h of n-butanol and 136 g / h of butanol and inhibitor stream containing recycle (via 6) and 187 g / h of catalyst-containing recycle stream obtained from the second reactor (200) (via 9) Continuously feed into the first reactor (100). Air was fed into the first reactor at a rate of 9.4 sccm. The first reactor, containing a liquid volume of 3.5 liters, was maintained at a temperature of 129°C and atmospheric pressure for 2 to 3 hours. A water-rich vapor s...

Embodiment 2

[0096] 576 g / h of acrylic acid and 599 g / h of n-butanol and 137 g / h of recycle butanol and inhibitor-containing stream (stream 6) and 156 g / h of catalyst-containing recycle obtained from the second reactor (stream 9) Add together to the first reactor. The first reactor (100) containing 3.5 liters of liquid was maintained at a temperature of 129°C and atmospheric pressure for 2 to 3 hours. A water-rich vapor stream is withdrawn from the first reactor and sent to a first distillation column where it is condensed and decanted. The aqueous phase is sent to another distillation column ( figure 1 not described in ), and the organic phase is returned to the first distillation column. A liquid stream of 1339 g / h (stream 1) was withdrawn from the first reactor and fed to the second reactor.

[0097] The second reactor (200) containing 3.5 liters of liquid was maintained at a temperature of 133°C and a pressure of about 350 mmHg absolute for 2 to 3 hours. In addition to feeding the ...

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Abstract

Crude butyl acrylate streams, e.g., from the reaction of butanol and acrylic acid, are refined using a splitter distillation column to yield a butyl acrylate- and heavies-containing bottoms fraction and an overhead fraction containing dibutyl ether, butyl acetate, butanol and butyl acrylate. The bottoms fraction is then subjected to separation, e.g., by distillation, to separate heavies from the bottoms fractions and to recover butyl acrylate. A process for the production of butyl acrylate is also disclosed, which process comprises not only the above-mentioned refining steps but also includes the steps of withdrawing from the splitter distillation column the overhead fraction and distilling the overhead fraction to recover a bottoms stream containing butanol and butyl acrylate, at least a portion of which could be recycled for reaction with acrylic acid to make butyl acrylate, and recovering the separated heavies, at least a portion of which could be recycled to a reaction zone for the production of butyl acrylate. At least 10,000 lb(avoir) quantities of a butyl acrylate product comprising at least 99.8% by weight of butyl acrylate and containing not more than about 200 ppm butyl ether and not more than about 200 ppm butyl acetate are producible.

Description

[0001] This application claims the benefit of prior US Patent Application Serial No. 60 / 018,538 (filed May 29, 1996). field of invention [0002] The present invention relates to the method for producing n-butyl acrylate by the esterification reaction of acrylic acid and n-butanol and relates to the method for refining butyl acrylate. According to the invention, a split distillation column is used for the separation between (i) light substances including dibutyl ether, butyl acetate, butanol and low-boiling components and (ii) acrylates and heavy substances. Background of the invention [0003] Butyl acrylate is produced by the equilibrium limit reaction of acrylic acid and n-butanol. The reaction is carried out at elevated temperature in the presence of a catalyst. Generally, water as a co-product is removed during the reaction to promote the reaction to be more favorable for the formation of butyl acrylate. In carrying out this reaction, impurities in the raw materials a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/54C07C69/54
CPCC07C67/54Y02P20/582C07C69/54
Inventor 何芳羔V·朱尔卡
Owner DOW GLOBAL TECH LLC
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