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    Purification of pyromellitic dianhydride
    1.
    发明授权
    Purification of pyromellitic dianhydride 失效
    均苯四酸二酐的纯化

    公开(公告)号：US3927039A

    公开(公告)日：1975-12-16

    申请号：US51980674

    申请日：1974-11-01

    Applicant: LABOFINA SA

    Inventor： DE HAULT EMMANUEL R E G DRAGUE ,  VAN TONGELEN MARCEL ,  DEBUS HENRI R

    IPC: C07D307/89 ,  C07C51/573

    CPC classification number: C07C51/573 ,  C07C63/313

    Abstract: A process for purifying pyromellitic dianhydride which comprises treating said dianhydride, containing impurities, with an alkylbenzene solvent having the general formula:

    WHEREIN R1 is a saturated aliphatic hydrocarbon radical containing from two to 20 carbon atoms, R2 is a saturated aliphatic radical containing from one to 20 carbon atoms and n is an integer between 0 and 5, the total number of the carbon atoms in R1 and R2 being less than 25, at a temperature between 0* and 280*C, separating the solid pyromellitic dianhydride from the liquid phase which contains alkylbenzene solvent and the impurities, and then evaporating said solvent which is contained in the pyromellitic dianhydride.

    Abstract translation: 一种纯化1,2,4,5-苯四酸二酐的方法，其包括用具有以下通式的烷基苯溶剂处理含有杂质的所述二酐：

    Process for producing anhydrides of aromatic polycarboxylic acids
    2.
    发明授权
    Process for producing anhydrides of aromatic polycarboxylic acids 失效
    制备芳族多元羧酸酐的方法

    公开(公告)号：US3925425A

    公开(公告)日：1975-12-09

    申请号：US41027573

    申请日：1973-10-26

    Applicant: LABOFINA SA

    Inventor： DRAGUEZ DE HAULT EMMANUEL R E ,  DEBUS HENRI R ,  VAN TONGELEN MARCEL

    IPC: C07D307/89 ,  B01J23/00 ,  B01J23/22 ,  B01J23/26 ,  B01J27/18 ,  B01J27/198 ,  C07B61/00 ,  C07C51/265 ,  C07C51/31

    CPC classification number: C07C51/265 ,  B01J23/22 ,  B01J23/26 ,  B01J27/18 ,  B01J27/198 ,  C07C51/313 ,  C07C63/16 ,  C07C63/313

    Abstract: A process for producing anhydrides of benzenepolycarboxylic acids by the vapor-phase oxidation of aromatic hydrocarbons selected from the group consisting of naphthalene, octahydroanthracene and polyalkylbenzenes containing at least two alkyl substituents in ortho position to one another and having the general formula

    WHEREIN R1 and R2 are alkyl radicals having a straight or branched chain and containing 1 to 6 carbon atoms and R3 and R4 are radicals selected from the group consisting of hydrogen and alkyl radicals containing 1 to 4 carbon atoms, the total number of carbon atoms of said polyalkylbenzenes being no higher than 18, said process comprising oxidizing said aromatic hydrocarbons at a temperature of between about 300* and 550*C and in the presence of a catalyst consisting of a refractory carrier and vanadium oxide, said catalyst prepared by impregnating said refractory carrier with an oxytrihalide of vanadium in which the halide is selected from the group consisting of chlorine and bromine, hydrolyzing said oxytrihalide and vanadium and then calcining said catalyst.

    Abstract translation: 通过气相氧化选自萘，八氢蒽和含有至少两个彼此邻位的烷基取代基并具有通式为WHEREIN R1和R2的萘，八氢蒽和多烷基苯的芳族烃的酸酐的制备方法 具有直链或支链并且含有1至6个碳原子的烷基，R 3和R 4是选自氢和含有1至4个碳原子的烷基的基团，所述聚烷基苯的总碳原子数不高 所述方法包括在约300-550℃的温度下和在由耐火材料载体和氧化钒组成的催化剂存在下氧化所述芳族烃，所述催化剂通过用氧化三氮鎓浸渍所述耐火载体而制备 其中卤化物选自由以下组成的组的钒 氯和溴，然后水解所述三氧化二铁和钒，然后煅烧所述催化剂。

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