Process for the continuous preparation of lower acrylates
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United States of America Patent
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Feb 16, 1993
Grant Date -
N/A
app pub date -
Nov 29, 1991
filing date -
Aug 3, 1989
priority date (Note) -
Expired
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Abstract
Process for the continuous preparation of lower acrylates from an aqueous solution of acrylic acid and from a lower alcohol, the esterification reaction taking place in liquid phase in a reactor, at a temperature of between 50.degree. C. and 110.degree. C., in the presence of at least one esterification catalyst, the reaction products leaving the reactor, consisting of a mixture of lower acrylate, water and unreacted starting compounds, being sent to the bottom of a distillation column and the lower acrylate being recovered at the head of the said column and sent towards a purification device. The said aqueous solution of acrylic acid is introduced at the bottom of the said distillation column where it is subjected to an azeotropic distillation, the stream obtained at the foot of the column, enriched in acrylic acid, then being recycled towards the reactor so that at the entry of the said reactor the molar ratio of acrylic acid to the lower alcohol is between 0.5 and 4.5.
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