Distillation: processes – separatory – With disparate physical separation – Utilizing liquid-liquid extracting of distillation product
Patent
1985-08-16
1987-07-28
Bascomb, Wilbur
Distillation: processes, separatory
With disparate physical separation
Utilizing liquid-liquid extracting of distillation product
203 47, 203 48, 203 81, 23297, 62532, 159 471, 560 78, B01D 900, C07C 6752
Patent
active
046830340
ABSTRACT:
The invention relates to a process for separating dimethyl isophthalate (DMI) and dimethyl orthophthalate (DMO) and other by-products from their mixture with dimethyl terephthalate (DMT), formed in the oxidation of p-xylene followed by esterification with methanol, by crystallization from the melt.
Initially, the esterification product is here distilled once or several times. The DMT-rich fraction obtained is then subjected wholly or partially to one or several crystallizations from the melt, and the DMI-DMO fraction thus obtained is at least partially removed from the system. As an alternative, the DMT-rich fraction is first recrystallized from methanol, the methanol is then evaporated from the mother liquor and the remaining residue is subjected to one or several crystallizations from the melt. The DMI-DMO fraction thus obtained is again at least partially removed from the system.
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patent: 3836573 (1974-09-01), Schreiber et al.
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Winnacker-Kuechler Chemische Technologie, 4th Ed., vol. 6, Carl Hanser Verlag, Munich, 1982, p. 148.
Bader Rolf
Last Hartmut
Mayer Manfred
Rittner Siegbert
Wetzel Edgar
Bascomb Wilbur
Hoechst Aktiengesellschaft
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