Method for the preparation of p-isopropenyl phenol

Claim 1

A method for the recovery of p-isopropenyl phenol in the form of a stable solution which comprises contacting p-isopropenyl phenol, in the form of a gas or of a liquid obtained immediately after condensation of said gas, said p-isopropenyl phenol gas being generated by thermal decomposition at a temperature of from 150° to 260° C. and at a pressure up to normal pressure of: a. bisphenol A in the presence of a catalytic amount of a base catalyst; or b. oligomers of p-isopropenyl phenol in the absence of catalyst or in the presence of a catalytic amount of a basic catalyst, directly with a solvent selected from the group consisting of: a monohydric alcohol expressed by the formula ROH wherein R is alkyl containing from 5 to 14 carbon atoms, cycloalkyl containing from 5 to 6 carbon atoms, or aralkyl containing from 7 to 10 carbon atoms; a dihydric alcohol or derivative thereof expressed by the formula ##STR6## wherein R 1 and R 2 are independently hydrogen or alkyl containing from 1 to 4 carbon atoms, R 3 is hydrogen, alkyl containing from 1 to 4 carbon atoms or acetyl and m is an integer of from 1 to 4; a dihydric alcohol or derivative thereof expressed by the formula HOC.sub.n H.sub.2n OR.sub.4 wherein R 4 is hydrogen, alkyl containing from 1 to 4 carbon atoms or acetyl, and n is an integer of from 3 to 6; and a trihydric alcohol or derivative thereof expressed by the formula HOC.sub.3 H.sub.5 (OR.sub.5).sub.2 wherein R 5 is hydrogen, alkyl containing from 1 to 4 carbon atoms or acetyl; an ester expressed by the formula R.sub.6 COOR.sub.7 wherein R 6 and R 7 are independently alkyl or cycloalkyl and the total number of carbon atoms in one molecule of the ester is within the range of from 6 to 20; and an acid amide expressed by the formula ##STR7## wherein R 8 , R 9 and R 9 ' are independently hydrogen or alkyl containing from 1 to 4 carbon atoms, and collecting said p-isopropenyl phenol in the form of a solution in said solvent.

Claim 2

A method for the recovery of p-isopropenyl phenol in the form of a stable solution which comprises contacting p-isopropenyl phenol, in the form of a gas or of a liquid obtained immediately after condensation of said gas, said p-isopropenyl phenol gas being generated by thermal decomposition at a temperature of from 150° to 260° C. and at a pressure up to normal pressure of: a. bisphenol A in the presence of a catalytic amount of a base catalyst; or b. oligomers of p-isopropenyl phenol in the absence of catalyst or in the presence of a catalytic amount of a basic catalyst, directly with a solvent selected from the group consisting of: a monohydric alcohol expressed by the formula ROH wherein R is alkyl containing from 5 to 14 carbon atoms, cycloalkyl containing from 5 to 6 carbon atoms, or aralkyl containing from 7 to 10 carbon atoms; a dihydric alcohol or derivative thereof expressed by the formula ##STR6## wherein R 1 and R 2 are independently hydrogen or alkyl containing from 1 to 4 carbon atoms, R 3 is hydrogen, alkyl containing from 1 to 4 carbon atoms or acetyl and m is an integer of from 1 to 4; a dihydric alcohol or derivative thereof expressed by the formula HOC.sub.n H.sub.2n OR.sub.4 wherein R 4 is hydrogen, alkyl containing from 1 to 4 carbon atoms or acetyl, and n is an integer of from 3 to 6; and a trihydric alcohol or derivative thereof expressed by the formula HOC.sub.3 H.sub.5 (OR.sub.5).sub.2 wherein R 5 is hydrogen, alkyl containing from 1 to 4 carbon atoms or acetyl; an ester expressed by the formula R.sub.6 COOR.sub.7 wherein R 6 and R 7 are independently alkyl or cycloalkyl and the total number of carbon atoms in one molecule of the ester is within the range of from 6 to 20; and an acid amide expressed by the formula ##STR7## wherein R 8 , R 9 and R 9 ' are independently hydrogen or alkyl containing from 1 to 4 carbon atoms, and collecting said p-isopropenyl phenol in the form of a solution in said solvent.