Procédé de purification de l'éthyl tertio butyl éther combinant un procédé à membrane et une distillation

• Main Author: STREICHER CHRISTIAN
• Format: Patent
• Language: French
• Published: 10.05.1996
• Edition: 6
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

A new process for the sepn. of a mixt. of ETBE and EtOH, in addn. contg. C4 hydrocarbons which comprises the following steps:- a) Introduction of the mixt. to be sepd. into a distn. zone (de-butanisation) practically all the C4 hydrocarbons being recovered at the head and purified ETBE obtd. at the base. b) At least one phase is withdrawn laterally from the distn. zone which is directed to a permeation zone producing a retentate (re-cycled to the distn. zone) and a permeate comprising mainly EtOH. The permeation zone is fitted with a sepn. membrane comprising at least one selective layer composed of a thick polymer film derived from at least one monomer of dimethyl-aminoethyl methacrylate (DMAEMA). Also claimed is a process for the synthesis of ETBE, including the purification process as above, where the alcohol permeate is re-cycled to the reaction zone or, possible, to a catalytic or reactive distn. column when employed.