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    Trimelitic acid anhydride product recovery from pseudocumene oxidation effluent
    1.
    发明授权
    Trimelitic acid anhydride product recovery from pseudocumene oxidation effluent 失效
    磷酸氢氧化物回收的三聚酸酐产品

    公开(公告)号：US3798238A

    公开(公告)日：1974-03-19

    申请号：US3798238D

    申请日：1971-02-24

    Applicant: STANDARD OIL CO

    Inventor： MEYER D

    IPC: C07C63/02 ,  C07C63/32

    CPC classification number: C07C51/567 ,  C07C63/307

    Abstract: FLUID EFFLUENT FROM PSEUDOCUMENE OXIDATION UNDER LIQUID PHASE CONDITIONS OR CONCENTRATE THEREOF IS SUBJECTED TO SIMULTANEOUS STRIPPING OF REACTION MEDIUM AND THERMAL CONVERSION OF ITS TRIMELLITIC ACID CONTENT TO CRUDE TRIMELLITIC ACID ANHYDRIDE FOLLOWED BY VACUUM FLASH DISTILLATION OR EVAPORATION OF THE ACID ANHYDRIDE FROM A MIXTURE OF SUCH CRUDE ACID ANHVDRIDE AND A SMALL AROUNT OF STRONG MINERAL ACID TO RECOVER PRODUCT ACID ANHYDRIDE. SUCH ACID ANHYDRIDE COVERY AVOIDS SUBJECTING SAID FLUID OXIDATION EFFLUENT TO CRYSTALLIZATION FOR TRIMELLITIC ACID RECOVERY WHICH LEAVES 30 TO 40 PERCENT OF THE OXIDATION PRODUCT TRICARBOXYLIC ACID DISSOLVED IN THE REACTION MEDIUM MOTHER LIQUOR REQUIRING FURTHER PROCESSING TO OBTAIN SUCH SOLUTE FOR CONVERSION INTO THE DESIRED ACID ANHYDRIDE PRODUCT.

    Recovery of trimellitic acid from pseudocumene liquid phase oxidation effluent
    2.
    发明授权
    Recovery of trimellitic acid from pseudocumene liquid phase oxidation effluent 失效
    从PSEUDOCUMENE液相氧化液中回收三聚氰酸

    公开(公告)号：US3853924A

    公开(公告)日：1974-12-10

    申请号：US10081770

    申请日：1970-12-22

    Applicant: STANDARD OIL CO

    Inventor： MEYER D ,  JOHNSTON G

    IPC: C07C51/42 ,  C07C63/32

    CPC classification number: C07C51/42 ,  C07C63/307

    Abstract: Enhanced recovery of trimellitic acid from liquid phase oxidation effluent that contains a substantial portion of the acid product as solute in acetic acid solvent by concentrating the effluent by use of heat values in the effluent to precipitate a first crop of acid product, displacing and replacing mother liquor with fresh acetic acid of low water content to a first slurry of 60 to 70 percent solids and 40 to 30 percent liquid, further concentrating displaced effluent mother liquor by removal of 80 to 90 percent of its solvent content, displacing and replacing the remaining 20 to 10 percent of solvent with fresh acetic acid of low water content to a second slurry of 60 to 70 percent solids and 40 to 30 percent liquid, combining and removing solvent from the first and second slurries. Advantageously by the use of those steps heat is not wasted, conventional crystallization is avoided and apparatus is minimized by the practice of that combination of procedural steps. The recovered trimellitic acid product can be converted to its intramolecular anhydride or inter- and intra-bis-anhydride.

    Abstract translation: 从液相氧化流出液中增加偏苯三酸的回收率，其中含有大部分酸产物作为溶剂在乙酸溶剂中，通过使用流出物中的热值浓缩流出物，沉淀第一批酸产物，置换和替换母体 将具有低含水量的新鲜乙酸的液体加入到60-70％固体和40-30％液体的第一浆料中，通过除去其80至90％的溶剂含量进一步浓缩排出的流出母液，置换和替换剩余的20 至10％的溶剂，其中含有低含水量的新鲜乙酸溶液至60至70％固体和40至30％液体的第二浆料，从第一和第二浆液中合并和除去溶剂。 有利地，通过使用这些步骤，不浪费热量，避免常规的结晶，并且通过实施该程序步骤的组合来使装置最小化。 回收的偏苯三酸产物可以转化为其分子内酸酐或内部和二 - 双酐。

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