Patent ID: 11858874
Assignee: LG CHEM, LTD.
Field: Organic fine chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for preparing alpha-methylstyrene, the method comprising:
dehydrating a dimethylbenzyl alcohol solution in a reactor under an acid catalyst to prepare alpha-methylstyrene, wherein a reaction product after the dehydration reaction comprises a first reaction product comprising a first alpha-methylstyrene; and a second reaction product comprising vapor (H2O), a second alpha-methylstyrene and unreacted materials; and
separating the second alpha-methylstyrene and the unreacted materials comprised in the second reaction product and recirculating the second alpha-methylstyrene and the unreacted materials to the reactor,
wherein a temperature inside the reactor during the dehydration reaction is 135° C. or higher, and
wherein a content of the acid catalyst is from 100 ppm to 1,500 ppm based on a total weight of dimethylbenzyl alcohol of the dimethylbenzyl alcohol solution.