Inter-integration membrane-reactive distillation for EL synthesis:
Equipment development and experimental validating
Abstract
Ethyl levulinate, one of main derivatives of levulinic acid (LA), is of
significant potential as platform chemicals for bio-based materials. The
esterification of LA was generally carried out in a conventional batch
reactor or in a conventional reactive distillation column. However,
traditional methods are hard to deal with equilibrium limited reactions
and azeotropic issues. Therefore, the reactive-vapor
permeation-distillation (R-VP-D) process, which integrated reaction,
distillation and membrane dehydration into one single unit, is proposed
in this paper and validated in the pilot-scale experiments. A
comparative study is made between a pilot-scale RD column with and
without vapor permeation membrane module. Owing to the water-selective
membrane and the ingenious design of related apparatuses, the R-VP-D
process reveal a superiority in LA conversion of 21.9% maximum higher
than RD without VP process and removing of product water about 53.6%
from VP module, which indicates its promising industrial application in
process intensification field.