C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/683.7
C07C 4/24 (2006.01) C07C 2/86 (2006.01) C07C 4/00 (2006.01) C07C 15/46 (2006.01)
Patent
CA 1283665
ABSTRACT OF THE DISCLOSURE 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°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 to 650°C in the presence of an acid catalyst.
572608
Shimizu Isoo
Tokumoto Yuuichi
Gowling Lafleur Henderson Llp
Nippon Petrochemicals Co. Ltd.
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