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

Patent · Sun Jan 01 00:00:00 EST 1984

OSTI ID:864996

Hearn, Dennis ^[1]

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1. Houston, TX

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.degree. to 250.degree. 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.

• Research Organization: CR & L/NEOCHEM JOINT VENTURE
• DOE Contract Number: FC07-80CS40454
• Assignee: Chemical Research & Licensing Company (Houston, TX)
• Patent Number(s): US 4447668
• OSTI ID: 864996
• Country of Publication: United States
• Language: English

Related Subjects

process
producing
purity
isoolefins
dimers
dissociation
ethers
alkyl
tertiary
butyl
amyl
dissociated
vapor
phase
contact
cation
acidic
exchange
resin
temperatures
range
150
degree
250
lhsv
20
produce
stream
consisting
unreacted
isobutene
isoamylene
alcohol
corresponding
radical
removed
isoolefin
fractionated
obtain
99
contacted
liquid
selectively
dimerize
highly
exothermic
reaction
followed
fractionation
dimerization
product
diisoolefin
97
produced
combined
dissociation-distillation
carried
overhead
bottom
tertiary butyl
exothermic reaction
exchange resin
liquid phase
vapor phase
tertiary amyl
stream consisting
alkyl radical
phase contact
cation acid
alkyl tertiary
/585/999/