The invention provides a process for producing and/or purifying acrylic acid or methacrylic acid and an ester of these, wherein high-boiling heavy ingredients (high-boiling matters) discharged from individual step units are classified by the content therein of (meth)acrylic acid and/or of the dimer thereof and treated. According to the invention, even when high-boiling matters which have been discharged from distillation columns, high-boiling-matter cracking reactors, and the like in a plant for producing (meth)acrylic acid and/or an ester thereof and are alike in liquid nature are mixed with each other in the same tank, no polymer precipitation occurs. The handling and storage thereof are hence easy. Consequently, tanks can be united into one, and the process is extremely advantageous in reducing the construction cost and the area necessary for equipment.
本发明提供了一种生产和/或提纯
丙烯酸或
甲基丙烯酸及其
酯类的工艺,其中从各个步骤单元排出的高沸点重质成分(高沸点物质)按其中的(
甲基)
丙烯酸和/或其二聚体的含量进行分类和处理。根据本发明,即使在生产(
甲基)
丙烯酸和/或其
酯的工厂中,从蒸馏塔、高沸点物质裂解反应器等排出的高沸点物质在液态性质上相同,并在同一储罐中相互混合,也不会发生
聚合物沉淀。因此,处理和储存都很方便。因此,储罐可以合二为一,该工艺在降低建造成本和减少设备所需面积方面具有极大的优势。