Terephthalic acid dimethyl ester membrane type crystal refining method

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 direc...

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Bibliographic Details
Main Authors SUN XUJIANG, ZHANG JUN, ZHANG JUNMIN
Format Patent
LanguageEnglish
Published 16.11.1994
Edition5
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
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Summary: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.
Bibliography:Application Number: CN1993104900