首页> 外国专利> SEPARATION OF DIMETHYLISOPHTHALATE AND DIMETHYLORTHOPHTHALATE FROM MIXTURE OF DIMETHYLISOPHTHALATE,DIMETHYLORTHOPHTHALATE AND DIMETHYLTEREPHTHALATE

SEPARATION OF DIMETHYLISOPHTHALATE AND DIMETHYLORTHOPHTHALATE FROM MIXTURE OF DIMETHYLISOPHTHALATE,DIMETHYLORTHOPHTHALATE AND DIMETHYLTEREPHTHALATE

机译：从邻苯二甲酸二甲酯，邻苯二甲酸二甲酯和间苯二甲酸二甲酯的混合物中分离出邻苯二甲酸二甲酯和邻苯二甲酸二甲酯

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摘要

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.

机译：本发明涉及从对苯二酸二甲酯氧化形成对苯二甲酸二甲酯然后用甲醇酯化形成的对苯二甲酸二甲酯（DMT）的混合物中分离间苯二甲酸二甲酯（DMI）和邻苯二甲酸二甲酯（DMO）及其他副产物的方法。从融化。首先，在此将酯化产物蒸馏一次或几次。然后将获得的富含DMT的馏分全部或部分地从熔体中进行一次或几次结晶，并将由此获得的DMI-DMO馏分至少部分地从系统中除去。或者，首先将富DMT的馏分从甲醇中重结晶，然后将甲醇从母液中蒸发，剩余的残留物从熔体中进行一次或多次结晶。如此获得的DMI-DMO馏分再次至少部分地从系统中除去。

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公开/公告号JPS6165847A

专利类型
公开/公告日1986-04-04

原文格式PDF
申请/专利权人 HOECHST AG;
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申请/专利号JP19850180608
发明设计人 RORUFU BAADERU;HARUTOMUUTO RASUTO;MANFUREETO MAIERU;JIIGUBERUTO RITSUTONERU;EDOGAARU UETSUTSUERU;
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申请日1985-08-19
分类号C07C67/52;C07C69/80;
国家 JP
入库时间 2022-08-22 07:43:56

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