Processes for producing esters of unsaturated carboxylic...

Details Processes for producing esters of unsaturated carboxylic... Processes for producing esters of unsaturated carboxylic...

2005-06-07

2005-06-07

Richter, Johann (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C560S205000, C560S206000

Reexamination Certificate

active

06903231

ABSTRACT:
Processes and apparatus for producing esters are described. The processes include: (a) providing a liquid reaction mixture comprising (i) an unsaturated carboxylic acid having a boiling point greater than water, (ii) a polyhydric alcohol, and (iii) a first polymerization inhibitor, in a reaction zone having an inner surface; (b) reacting the acid and the polyhydric alcohol to form an ester, such that a gas/vapor phase is formed comprising water of reaction; (c) removing at least a portion of the gas/vapor phase from the reaction zone to a dephlegmation zone having an inner surface; (d) partially condensing the portion of the gas/vapor phase in the dephlegmation zone such that a condensate is formed; and (e) returning the condensate to the reaction zone; wherein a second polymerization inhibitor is introduced into the dephlegmation zone such that the portion of the gas/vapor phase and/or the condensate are contacted with the second polymerization inhibitor. Apparatus for carrying out the processes are also described.

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