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    • 47. 发明公开
    • SYSTEM AND METHOD FOR REDUCTION OF WATER CONSUMPTION IN PURIFIED TEREPHTHALIC ACID PRODUCTION
    • SYSTEM UND VERFAHREN ZUR REDUZIERUNG DES WASSERVERBRAUCHS贝德尔斯通公司VER GEREINIGTERTEREPHTHALSÄURE
    • EP2575992A4
    • 2017-07-26
    • EP11803211
    • 2011-05-16
    • AMT INT INC
    • JANG JI-YOUNGWU KUANG-YEUYANG MING-MOU
    • B01D3/36B01D3/14B01D3/40
    • B01D3/36B01D3/143B01D3/40
    • The invention disclosed is an apparatus and method for the recovery of acetic acid, azeotropic agent, extraction agent, re-usable water and other reaction products such as p-toluic acid, from an aqueous stream generated during a terephthalic acid production process, having superior energy efficiency and reduced water consumption. The apparatus of the invention includes: an azeotropic distillation column to remove water from acetic acid, a pair of mother liquor extraction columns sequentially connected in series for primary recovery of extraction solvent and other organics, an azeotropic agent stripper for recovery of azeotropic agent and a post-separation solvent stripper distillation column for further separation of the aqueous bottoms stream from said extraction columns into a volatiles stream comprising mainly organics with a very low amount of water and a liquid stream comprising water containing very low amounts of organics, each stream being sufficiently pure that it can be recycled for reuse in the purification of crude terephthalic acid.
    • 所公开的发明是从对苯二甲酸生产过程中产生的含水物流中回收乙酸,共沸剂,萃取剂,可再用水和其它反应产物如对甲苯甲酸的装置和方法, 能源效率和减少用水量。 本发明的装置包括:从乙酸中除去水的共沸蒸馏塔,串联连接的一对母液萃取塔,用于萃取溶剂和其它有机物的一次回收,用于回收共沸剂的共沸剂汽提塔和 后分离溶剂汽提塔蒸馏塔,用于将来自所述萃取塔的含水底部物流进一步分离成主要包含具有非常少量水的有机物的挥发性物流和包含含有非常少量有机物的水的液体物流,每个物流足够 纯净的是它可以被回收再利用来纯化粗制对苯二甲酸。