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