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Process for the separation of dimethyl-iso- and -orthophthalate from a mixture of these esters with dimethylterephthalate
Process for the separation of dimethyl-iso- and -orthophthalate from a mixture of these esters with dimethylterephthalate
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机译:从这些酯与对苯二甲酸二甲酯的混合物中分离邻苯二甲酸二甲酯和邻苯二甲酸二甲酯的方法
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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.
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