Process for the preparation of alkali metal salts of hydroxybenzoates, which are substantially anhydrous and free from hydroxybenzoic acid

摘要: Alkali metal salts of hydroxybenzoates are claimed which substantially anhydrous and free from hydrobenzoic acid have the formula ##STR1## in R1 denotes alkyl, alkenyl, cycloalkyl or aralkyl, R2 R3 identical different represent hydrogen, halogen, hydroxyl, amino, alkylamino, alkoxy, aralkyl aryl Me an alkali metal. Furthermore a process for preparation said hydroxybenzoates, acid, characterized that solution suspension hydroxybenzoate ##STR2## R1, abovementioned meaning, is neutralized with hydroxide at -10° to +50° C. until degree neutralization 0.95 1.05, 1.00 denoting end point phenolic OH group by hydroxide, resulting salt passed mild drying operation does not damage product itself known, after time such content hydroxybenzoic thereof this reach value 1% weight, relative amount contained suspension.