Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1978-05-10
1980-02-12
Konopka, P. E.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252415, 252431R, 252426, 252430, 585477, 585486, 526243, 526247, B01J 3140
Patent
active
041883080
ABSTRACT:
This invention relates to a method for preparing an acid catalyst which comprises contacting a copolymer of perflurovinyl ether and tetrafluoroethylene containing pendant sulfonate groups with a strong acid having a pKa of less than 1 to convert said sulfonate groups into sulfonic acid groups, removing the excess strong acid and salt formed from such conversion, preferably by washing said sulfonic acid group containing polymer with a solvent in which said salt and said acid are soluble, and removing said solvent from said sulfonic acid group containing polymer. Preferably the strong acid is nitric acid, e.g., aqueous nitric acid, and said solvent is aqueous. The excess solvent may be removed by drying at a temperature of from 50 to 200 degrees C., preferably at reduced pressures. The use of the catalyst prepared by this method for isomerization of hydrocarbons, e.g., xylene, and dealkylation of alkylbenzenes, e.g., diethylbenzene and diisopropylbenzene are also claimed.
REFERENCES:
patent: 3282875 (1966-11-01), Connolly et al.
patent: 3624053 (1971-11-01), Gibbs
Konopka P. E.
Varen Technology
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