Preparing alkyl ester of (meth)acrylic acid comprises supplying (meth)acrylic acid, alkanol and catalyst to reaction zone, adding discharged mixture to separation unit, initiating the ester into rectification unit and isolating streams

摘要

Continuous preparation of alkyl ester of (meth)acrylic acid (A) comprises supplying (meth)acrylic acid, 1-5C alkanol and acid esterifying catalyst (a) to a reaction zone (5,6), adding the discharged reaction mixture from the zone to a catalyst separation unit (V), separating depleted main stream (56) and depleted sump stream (54) of (A) and (a), initiating (A) containing main stream into a rectification unit (I) and isolating streams of (A). Continuous preparation of alkyl ester of (meth) acrylic acid (A) comprises reaction of (meth) acrylic acid and 1-5C alkanol in homogeneous, liquid, solvent-free phase with increased temperature and in presence of a acidic esterifying catalyst, where (meth)acrylic acid, alkanol and acid esterified catalyst are supplied to a reaction zone (5,6) (that water formed during a retention time are separated rectificative as a component of a alkanol comprising mixture in one of the reaction zone mounted rectification unit (III), in which obtained distillate is isolated in a alkanol containing organic and a water containing aqueous phase, the organic phase is led back into the rectification unit (III) and the aqueous phase is removed, and a reaction mixture (21) are discharged from the reaction zone), where the reaction mixture discharged from the reaction zone is added to a catalyst separation unit (V) and the alkyl ester of (meth)acrylic acid containing in and at acidic esterified catalyst depleted main stream (56) and the predominant part of the acid esterified catalyst containing and at water depleted sump stream (54) are separated in the catalyst separation unit (V) and alkyl ester of (meth)acrylic acid containing main stream is initiated into a rectification unit (I) and the alkyl ester of (meth)acrylic acid containing in main stream (23) and a sump stream (52) are isolated under addition of water.