A kinetic mechanistic study of acid-catalyzed alkylation of isobutane with C4-olefins at low temperatures
Book
·
OSTI ID:5769269
A kinetic and mechanistic study of sulfuric acid-catalyzed alkylation of isobutane with C/sub 4/-Olefins at Low Temperatures(-20/sup 0/ to 0/sup 0/C) was based on a new two-step reaction sequence in which the desired first-step reactions are between acid and olefin to form sulfates and the desired second-step reactions are between sulfates and isobutane to form mostly trimethylpentanes. Linear butenes formed stable sulfates that formed alkylates of exceptionally high quality, up to 100 Research octane, whereas isobutylene and trimethylpentene mainly polymerized during the first step, and the alkylate produced had only 90 Research octane. Trimethylpentanes and dimethylhexanes, when contacted with concentrated sulfuric acid at -10/sup 0/ to +25/sup 0/C, degraded and isomerized to form C/sub 4/-C/sub 9/ and higher isoparaffins and acid-soluble hydrocarbons (conjunct polymers). For the two-step process and the degradation and isomerization reactions, kinetic models based on reaction at the interface were developed; but for isoolefins, a polymerization-cracking sequence (via C/sub 12/- and even C/sub 16/-olefins) is the preferred route. Commercial applications of the results are proposed.
- OSTI ID:
- 5769269
- Country of Publication:
- United States
- Language:
- English
Similar Records
Degradation and isomerization of isoparaffins while in contact with sulfuric acid in alkylation units: Chemistry and reaction kinetics
hf alkylation in the 1980's: the role of isobutane/olefin ratio
High octane alkylate from cation exchange resin/boron trifluoride catalytic process
Journal Article
·
Thu Mar 31 23:00:00 EST 1994
· Industrial and Engineering Chemistry Research; (United States)
·
OSTI ID:7041194
hf alkylation in the 1980's: the role of isobutane/olefin ratio
Conference
·
Tue Aug 01 00:00:00 EDT 1978
· Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States)
·
OSTI ID:6408583
High octane alkylate from cation exchange resin/boron trifluoride catalytic process
Conference
·
Tue Aug 01 00:00:00 EDT 1978
· Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States)
·
OSTI ID:6500903
Related Subjects
2-METHYLPROPANE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
ALKENES
ALKYLATION
BUTENES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DECOMPOSITION
EVALUATION
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ISOMERIZATION
KINETICS
LOW TEMPERATURE
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PENTANE
POLYMERIZATION
REACTION KINETICS
SULFATES
SULFUR COMPOUNDS
SULFURIC ACID
TEST FACILITIES
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
ALKENES
ALKYLATION
BUTENES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DECOMPOSITION
EVALUATION
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ISOMERIZATION
KINETICS
LOW TEMPERATURE
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PENTANE
POLYMERIZATION
REACTION KINETICS
SULFATES
SULFUR COMPOUNDS
SULFURIC ACID
TEST FACILITIES