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    • 6. 发明申请
    • LIQUID PHTHALIC ANHYDRIDE RECOVERY PROCESS USING A RECTIFICATION TOWER WITH BENZOIC ACID CONTROL
    • 使用具有苯甲酸控制的整流塔的液体PHHALIC ANHYDRIDE RECOVERY PROCESS
    • WO1998023571A1
    • 1998-06-04
    • PCT/US1997021862
    • 1997-11-26
    • EXXON CHEMICAL PATENTS INC.
    • EXXON CHEMICAL PATENTS INC.BAIEL, James, J.JONES, Larry, O.
    • C07C51/573
    • C07C51/43C07C63/16
    • A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130 DEG C or greater with a first stream comprising maleic anhydride, benzoic acid present in an amount of less than 8 mole %, based on the total concentration of the first stream, and at least one compound selected from the group consisting of citraconic anhydride and phthalic anhydride, in a rectification tower such that a substantial portion of the phthalic anhydride contained within the vapor phase oxidation product transfers from the vapor phase to a liquid phase and a substantial portion of the by-products contained in the first stream which are more volatile than phthalic anhydride transfer from the liquid phase to the vapor phase and wherein a vapor-to-liquid weight ratio in the range between about 2 to 20 is exhibited within the rectification tower, thereby forming a liquid phase phthalic anhydride product having a phthalic anhydride concentration in the range between about 50-100 wt.%.
    • 从气相氧化产物中回收邻苯二甲酸酐作为液体的方法,该方法包括将温度为约130℃或更高的气相氧化产物与包含马来酸酐的第一物流,苯甲酸的存在量小于 8摩尔%,基于第一料流的总浓度,以及至少一种选自柠康酐和邻苯二甲酸酐的化合物,在精馏塔中使得大部分邻苯二甲酸酐包含在气相氧化 产物从蒸气相转移到液相,以及包含在第一物流中的大部分副产物,其比从邻苯二甲酸酐从液相转移到气相更易挥发,并且其中汽 - 液重量比 在精馏塔内表现出约2〜20的范围,从而形成液相邻苯二甲酸酐p 邻苯二甲酸酐浓度在约50-100重量%之间的范围内。