B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
202/88
B01D 3/14 (2006.01) C07C 67/08 (2006.01) C07C 67/54 (2006.01)
Patent
CA 1307761
ABSTRACT PROCESS A continuous process is described for the production of a substantially acid free dialkyl maleate, for example diethyl maleate, from a feed stream containing a major amount of dialkyl maleate and a minor amount of the corresponding monoalkyl maleate. This comprises continuously distilling the feed stream in a primary distillation zone, which can comprise a single distillation column or a series of distillation columns connected in series, so as to give (i) a bottom fraction containing monoalkyl maleate and dialkyl maleate in admixture, (ii) a vaporous fraction comprising alkanol, and (iii) an intermediate fraction that is substantially free from alkanol and comprises a major proportion of diethyl maleate and a minor proportion of maleic anhydride. The intermediate fraction (iii) is redistilled in a secondary distillation zone to yield (i) an overhead fraction containing maleic anhydride and (ii) a bottom fraction containing substantially acid free dialkyl maleate. The vaporous stream can be condensed to recover alkanol for recycle to a dialkyl maleate production facility.
543541
Harris Norman
Rathmell Colin
Scarlett John
Turner Keith
Davy Mckee (london) Limited
Ridout & Maybee Llp
LandOfFree
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