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专利名称：Process for the purification of acrylic and
methacrylic acid
发明人：MACHHAMMER, OTTO, DR.,DAMS,
ALBRECHT, DR.,ECK, BERND,PROLL, THEO,DR.
申请号：EP97102813.9申请日：19970220公开号：EP0792867A3公开日：19980107
摘要：Acrylic acid or methacrylic acid is purified by
< P>(a) subjecting a mixture comprising the acrylic acid or methacrylic acid to asharply defined separation process essentially in the absence of an organic solvent, withthe composition of the phase in which the acrylic acid or methacrylic acid accumulatesremaining essentially constant when the composition of the other phases participating inthe mass transfer changes, then taking off this phase and
(b) subjecting at least a part of the remaining phase from stage(a) to a less sharplydefined separation process and
(c) feeding one of the phases formed in stage (b) to the sharply defined separationprocess in stage (a).
In addition, the invention provides a process for preparing acrylic acid or methacrylicacid which includes the abovementioned purification process.
申请人：BASF AKTIENGESELLSCHAFT
地址：67056 Ludwigshafen DE
国籍：DE
代理机构：Isenbruck, Günter, Dr.
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