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Title: Process for producing high purity isoolefins and dimers thereof by dissociation of ethers

Abstract

Alkyl tertiary butyl ether or alkyl tertiary amyl ether is dissociated by vapor phase contact with a cation acidic exchange resin at temperatures in the range of 150 to 250 F at LHSV of 0.1 to 20 to produce a stream consisting of unreacted ether, isobutene or isoamylene and an alcohol corresponding to the alkyl radical. After the alcohol is removed, the ether/isoolefin stream may be fractionated to obtain a high purity isoolefin (99+%) or the ether/isoolefin stream can be contacted in liquid phase with a cation acidic exchange resin to selectively dimerize the isoolefin in a highly exothermic reaction, followed by fractionation of the dimerization product to produce high purity diisoolefin (97+%). In the case where the alkyl is C[sub 3] to C[sub 6] and the corresponding alcohol is produced on dissociation of the ether, combined dissociation-distillation may be carried out such that isoolefin is the overhead product and alcohol the bottom. 2 figs.

Inventors:
; ;
Publication Date:
OSTI Identifier:
7261833
Patent Number(s):
US 4447668; A
Application Number:
PPN: US 6-496983
Assignee:
Chemical Research Licensing Co., Houston, TX (United States)
DOE Contract Number:  
FC07-80CS40454
Resource Type:
Patent
Resource Relation:
Patent File Date: 25 May 1983
Country of Publication:
United States
Language:
English
Subject:
10 SYNTHETIC FUELS; 2-METHYLPROPENE; FRACTIONATION; ALKENES; SYNTHESIS; ETHERS; DISSOCIATION; ALCOHOLS; DIMERIZATION; ION EXCHANGE MATERIALS; CHEMICAL REACTIONS; HYDROCARBONS; HYDROXY COMPOUNDS; MATERIALS; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; POLYMERIZATION; SEPARATION PROCESSES; 100200* - Synthetic Fuels- Production- (1990-)

Citation Formats

Smith, Jr, L A, Jones, Jr, E M, and Hearn, D. Process for producing high purity isoolefins and dimers thereof by dissociation of ethers. United States: N. p., 1984. Web.
Smith, Jr, L A, Jones, Jr, E M, & Hearn, D. Process for producing high purity isoolefins and dimers thereof by dissociation of ethers. United States.
Smith, Jr, L A, Jones, Jr, E M, and Hearn, D. Tue . "Process for producing high purity isoolefins and dimers thereof by dissociation of ethers". United States.
@article{osti_7261833,
title = {Process for producing high purity isoolefins and dimers thereof by dissociation of ethers},
author = {Smith, Jr, L A and Jones, Jr, E M and Hearn, D},
abstractNote = {Alkyl tertiary butyl ether or alkyl tertiary amyl ether is dissociated by vapor phase contact with a cation acidic exchange resin at temperatures in the range of 150 to 250 F at LHSV of 0.1 to 20 to produce a stream consisting of unreacted ether, isobutene or isoamylene and an alcohol corresponding to the alkyl radical. After the alcohol is removed, the ether/isoolefin stream may be fractionated to obtain a high purity isoolefin (99+%) or the ether/isoolefin stream can be contacted in liquid phase with a cation acidic exchange resin to selectively dimerize the isoolefin in a highly exothermic reaction, followed by fractionation of the dimerization product to produce high purity diisoolefin (97+%). In the case where the alkyl is C[sub 3] to C[sub 6] and the corresponding alcohol is produced on dissociation of the ether, combined dissociation-distillation may be carried out such that isoolefin is the overhead product and alcohol the bottom. 2 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {5}
}