Terephthalic acid dimethyl ester membrane type crystal refining method

• Main Authors: SUN XUJIANG, ZHANG JUN, ZHANG JUNMIN
• Format: Patent
• Language: English
• Published: 16.11.1994
• Edition: 5
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR; CHEMISTRY; CRYSTAL GROWTH; METALLURGY; ORGANIC CHEMISTRY; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; REFINING BY ZONE-MELTING OF MATERIAL; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; SINGLE-CRYSTAL-GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL

The present invention relates to a method for refining dimethyl terephthalate (DMT). It is that the crude DMT is conveyed into an interrupted-operation membrane crystallizer to make it pass through the procedures of crystalllization and fusing treatment, so that the invented product DMT can be directly obtained by once treatment. Said invention is simple in technological process, low in operation cost, and good in refining effect, so that it has the good economic and technic effects.