| Patent Number |
Title Of Patent |
Date Issued |
| 4408058 |
Preparation of ortho-sulfobenzoic acid anhydride by catalyzed thermolysis |
October 4, 1983 |
| This invention relates to a process for the synthesis of ortho-sulfobenzoic acid anhydride which comprises heating a 2-sulfohalide benzoate in the presence of a catalytic amount of a Friedel-Crafts catalyst. Especially preferred in the practice of this invention is the reaction of or |
| 4269987 |
Purification of triazoles |
May 26, 1981 |
| A method for purifying a triazole composition is disclosed. The method involves the steps of producing a substantially anhydrous slurry in an alcohol of an alkali metal or of an alkaline earth metal salt of the triazole to be purified, separating solids from the slurry and washing the |
| 4170521 |
Purification of triazoles |
October 9, 1979 |
| A method for purifying benzotriazole, tolyl-triazole or mixtures of the two is disclosed. The method includes the steps of vacuum distillation of crude triazole and collection of the condensate. The crude triazole contains color bodies, diazotizable impurities which are color body pr |
