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PROCESS FOR CRYSTALLIZATION AND SOLID-LIQUID SEPARATION IN TEREPHTHALIC ACID PREPARATION
PROCESS FOR CRYSTALLIZATION AND SOLID-LIQUID SEPARATION IN TEREPHTHALIC ACID PREPARATION
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机译:对苯二甲酸制备过程中的结晶和固液分离过程
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摘要
The present invention relates to a process for crystallization and solid-liquid separation to separate a solid-phase terephthalic acid from slurry including the terephthalic acid and reaction intermediates produced via a paraxylene oxidation, wherein the reaction intermediates include a paratoluic acid and a 4-carboxybenzaldehyde. The process comprises filtering the crystallized slurry in a high-temperature high-pressure filter, separating the terephthalic acid in the form of solid, and separating a mother liquid having the reaction intermediates in the form of liquid, characterized in that the operating temperature of the high-temperature, high-pressure filter is 130~220°C and the operating pressure thereof is 10~20kgf/cm2g. The slurry includes paratoluic acid at more than 10 wt %, preferably more than 20 wt %, and the crystallization can be carried out in a crystallization tank.
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