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1. (WO2017202731) PROCESS FOR THE SEPARATION OF DIOLS

Pub. No.:    WO/2017/202731    International Application No.:    PCT/EP2017/062168
Publication Date: Fri Dec 01 00:59:59 CET 2017 International Filing Date: Sat May 20 01:59:59 CEST 2017
IPC: C07C 29/84
C07C 31/20
Applicants: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
SHELL OIL COMPANY
Inventors: FISCHER, Kai, Jürgen
PEREZ GOLF, Carmelo
HUIZENGA, Pieter
Title: PROCESS FOR THE SEPARATION OF DIOLS
Abstract:
The invention provides a process for the separation of a first diol, selected from the group consisting of C3 to C7 diols from a first mixture comprising two or more C3 to C7 diols, said process comprising the steps of: (i) providing said first mixture comprising two or more C3 to C7 diols as a feed to a first distillation column; (ii) providing a feed comprising an extractant to the first distillation column above the first mixture; (iii) operating the first distillation column at a temperature in the range of from 50 to 250 °C and a pressure in the range of from 0.1 to 400 kPa; (iv) removing a stream comprising the first diol and the extractant as a bottoms stream from the first distillation column; and (v) subjecting the stream comprising the first diol and the extractant to distillation in a second distillation column to provide a stream from the top-section of the second distillation column comprising the first diol in high purity and a stream from the bottom section of the second distillation column comprising a used extractant stream, wherein the extractant is selected from the group of C3 to C6 sugar alcohols and mixtures thereof, and wherein the first diol is a close-boiler to and/or forms an azeotrope with one or more of the other C3 to C7 diols present in the first mixture