Isobutylene
Title: Isobutylene
CAS Registry Number: 115-11-7
CAS Name: 2-Methylpropene
Additional Names: isobutene
Molecular Formula: C4H8
Molecular Weight: 56.11
Percent Composition: C 85.62%, H 14.37%
Line Formula: CH2=C(CH3)2
Literature References: Obtained from refinery streams by absorption on 65% H2SO4 at about 15°: Packie, Rupp, US 2424186, US 2509885; Draeger, US 2456260; Steele, Epps Jr., US 2497191 (1947, 1950, 1948, 1950, all to Standard Oil); Peters, Gothman; Edwards, Wesselhoft, US 2962537; US 3129265 (1960, 1964, both to Esso). Separation from a mixed C4 stream using 50% H2SO4: GB 824573, GB 858645 and FR 1337232 (1959, 1961 and 1963 to Compagnie Francaise de Raffinage); Valet et al., Hydrocarbon Process. Petr. Refin. 41, No. 5, 119 (1962); Martel, Chem. Eng. 72, No. 7, 66 (1965). Prepn: Verdol, US 3170000 (1965 to Sinclair). Review: Kennedy, Kirshenbaum, "Isobutylene" in Vinyl and Diene Monomers (part 2), E. C. Leonard, Ed. (Wiley-Interscience, New York, 1971) pp 691-756.
Properties: Gas. bp760 -6.900°; bp100 -49.309°; bp30 -67.90°; bp10 -81.95°; bp1 -105.06°. d420 0.5942; d425 0.5879; d430 0.5815. Practically insol in water. Very sol in alc, ether, sulfuric acid.
Boiling point: bp760 -6.900°; bp100 -49.309°; bp30 -67.90°; bp10 -81.95°; bp1 -105.06°
Density: d420 0.5942; d425 0.5879; d430 0.5815
CAUTION: Simple asphyxiant.
Use: Primarily used to produce diisobutylene, trimers, butyl rubber, and other polymers; also to produce antioxidants for foods, packaging, food supplements, and for plastics: Hatch, Pet. Refin. 39, No. 6, 207 (1960).

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