(Meth)acrylate Ester Production via Anhydride Extraction

The patent extracts and removes the harmful impurity (carboxylic acid) from the reaction mixture by reacting it with an organic base to form a soluble salt, which is then separated from the organic phase containing (meth)acrylic acid anhydride. This eliminates the need for aqueous washing that causes hydrolysis and waste water generation.

The patent introduces an organic base as an intermediary substance to neutralize the carboxylic acid impurity. The organic base forms a soluble salt with the acid that can be easily separated, serving as a mediator that removes the harmful acid without requiring water that would cause hydrolysis.

The patent extracts the carboxylic acid impurity from the (meth)acrylic acid anhydride through chemical reaction with an organic base, forming a separable salt. This removes the need for fractional distillation that causes loss of material in distillate and reaction vessel residues.

The patent converts the harmful carboxylic acid impurity into a beneficial form by reacting it with an organic base to form a soluble salt. This transformation allows easy separation and removal of the impurity without the material losses associated with distillation, while the salt can potentially be reused to regenerate the acid.

The patent performs preliminary purification of (meth)acrylic acid anhydride by removing carboxylic acid impurities through reaction with an organic base before the alcoholysis reaction. This preliminary action prevents the formation of Michael addition products and ester impurities during the subsequent reaction with alcohol, ensuring high yield and purity.

The patent applies preliminary anti-action by removing the carboxylic acid impurity that would otherwise cause harmful side reactions (Michael addition) during the alcoholysis process. By eliminating the acid before reaction with alcohol, the patent prevents the formation of unwanted ester impurities and maximizes the yield of desired (meth)acrylate.

The patent extracts and removes the carboxylic acid impurity through chemical reaction with an organic base, forming a separable salt. This eliminates the need to use surplus of either reactant for purification purposes, allowing stoichiometric or near-stoichiometric amounts to be used without material loss.

The patent introduces an organic base as an intermediary that selectively reacts with the carboxylic acid impurity without consuming the main reactants ((meth)acrylic acid anhydride or alcohol). This intermediary approach enables easy removal of impurities without requiring surplus addition of reactants, thus avoiding loss of valuable materials.