A kinetic mechanistic study of acid-catalyzed alkylation of isobutane with C4-olefins at low temperatures

Book · Sun Jan 01 00:00:00 EST 1978

OSTI ID:5769269

Doshi, B M

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
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
2-METHYLPROPANE
ALKYLATION
ALKENES
BUTENES
CHEMICAL REACTION KINETICS
DECOMPOSITION
EVALUATION
ISOMERIZATION
LOW TEMPERATURE
PENTANE
POLYMERIZATION
SULFATES
SULFURIC ACID
TEST FACILITIES
ALKANES
CHEMICAL REACTIONS
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
REACTION KINETICS
SULFUR COMPOUNDS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)