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

Hutson, T Jr

Research devoted to maximizing no-lead octane numbers in motor fuel is reported. Results of the studies are the basis for the following conclusions: 1. Isobutane alkylate made from either propylene, butene-2, or C/sub 3/--C/sub 4/ mixed olefins is a low sensitivity, high motor octane product. Typically, C/sub 3/--C/sub 4/ mixed olefin alkylate has a clear motor octane number of about 92.2 and a clear Research octane number of about 93.5. 2. In separate studies with propylene, butene-2 and C/sub 3/--C/sub 4/ mixed olefins, increasing the isobutane-to-olefin ratio suppressed the formation of high molecular weight residue, indicating a substantial reduction in the role of olefin polymerization to large ions. The overall result of increasing ratio was an improvement in selectivity to high-octane components in the alkylate. 3. When alkylating isobutane with propylene, increasing the ratio resulted in a decrease in the concentration of C/sub 7/-fraction (primary product) and an increase in the C/sub 8/-fraction (from chain initiation and subsequent hydrogen transfer). At the same time, the production of chain-termination-product propane also increased. 4. When alkylating isobutane with C/sub 3/--C/sub 4/ mixed olefins, increasing the ratio showed the same trend obtained in separate alkylation tests with propylene and butene-2. As the ratio increased, the concentration of C/sub 7/-fraction (primary propylene--isobutane product) decreased and the concentration of C/sub 8/-fraction increased markedly. Thus, increasing isobutane-to-olefin ratio exerted a strong effect on alkylate quality in the area of about 5 to 1 to 20 to 1; this effect diminished at ratios 20:1.

• Research Organization: Phillips Petroleum Co., Bartlesville, OK
• OSTI ID: 6408583
• Report Number(s): CONF-780902-P3
• Journal Information: Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States), Vol. 23:3; Conference: American Chemical Society meeting, Miami, FL, USA, 10 Sep 1978
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ALKENES
ALKYLATION
BUTENES
GASOLINE
ANTIKNOCK RATINGS
HYDROFLUORIC ACID
ALKYLATING AGENTS
PROPYLENE
CATALYTIC EFFECTS
ANTIMITOTIC DRUGS
CHEMICAL REACTIONS
DRUGS
FUELS
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
020400* - Petroleum- Processing
023000 - Petroleum- Properties & Composition