Process for preparing carboxylic acids and derivatives thereof
申请人:——
公开号:US20040210087A1
公开(公告)日:2004-10-21
Processes for preparing carboxylic acids and derivatives thereof in which an ammonium salt of the carboxylic acid is heated in the presence of an organic reagent to split the salt and form the acid or, where the organic reagent is an esterifying agent, the corresponding ester. Both the acid and the ester may be dehydrated to form unsaturated counterparts.
Suggested are paint and coating remover compositions, comprising
(a) a first solvent selected from the group consisting of carboxylic acid dialkylamides, and
(b) a second solvent selected from the group consisting of C1-C6 alcohols, C2-C10 polyols, C2-C6 ketones, NMP, DMF, mono or dicarboxylic acid esters, aromatic hydrocarbons, terpenes, nitromethane and their mixtures.