Utilization of an Extracting Agent as Antifoaming Agent in the Production of Anhydrous Formic Acid

摘要

The present invention also for the extraction as the formate in the compounds of the formula I prepared for a distillation process to be used as anti-foaming agents at the same time , to an anhydrous or substantially anhydrous formic acid method to produce . ; & gt formula I &; ; wherein the radical R ¹ and R ² is or represents an alkyl , cycloalkyl, aryl or aralkyl , or R ¹ and R ² is a heterocyclic ring together with the N atom form a five- or six-membered ring, and only one of the radicals is an aryl group , R ³ is hydrogen or C ₁ -C ₄ - the group .