Chemistry of hydrocarbon compounds – Plural serial diverse syntheses – To produce aromatic
Patent
1988-07-19
1989-08-08
Davis, Curtis R.
Chemistry of hydrocarbon compounds
Plural serial diverse syntheses
To produce aromatic
585320, 585321, 585426, 585439, 585446, 585456, C07C 424
Patent
active
048555185
ABSTRACT:
A method for producing p-alkylstyrene which is characterized in that side reaction scarcely occurs, catalyst and unreacted material are easily recovered for the reuse, the p-position selectivity is excellent and yield of aimed product is high. In the method, monoalkylbenzene having an alkyl group with 3 or more carbon atoms is reacted with acetaldehyde in the presence of hydrogen fluoride catalyst under the conditions of a temperature of 0.degree. C. or lower, a molar ratio of 2 to 100 in "alkylbenzene/acetaldehyde", the other molar ratio of 1.7 to 300 in "hydrogen fluoride/acetaldehyde", the proportion of hydrogen fluoride to the sum of hydrogen fluoride and water in the reaction system of 65% by weight or higher, and the concentration of acetaldehyde in the reaction system of 1.0% by weight or lower to obtain 1,1-bis(p-alkylphenyl)ethane, and then subjecting it to catalytic cracking at a temperature in the range of 200.degree. to 650.degree. C. in the presence of an acid catalyst.
REFERENCES:
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patent: 3441625 (1969-04-01), Bargeron et al.
patent: 4070366 (1978-01-01), Gregorovich et al.
patent: 4694100 (1987-09-01), Shimizu et al.
Shimizu Isoo
Tokumoto Yuuichi
Davis Curtis R.
Nippon Petrochemicals Company Limited
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