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    PROCESS FOR THE PREPARATION OF MALEIC ANLYDRIDE
    121.
    发明授权
    PROCESS FOR THE PREPARATION OF MALEIC ANLYDRIDE 失效

    公开(公告)号：KR810000266B1

    公开(公告)日：1981-03-26

    申请号：KR750001472

    申请日：1975-07-03

    Applicant: UCB SA

    Inventor： LEITARD J ,  MATTHIJS GUIDE

    IPC: C07D307/60

    Abstract: The dehydration of maleic acid (I) to maleic anhydride (II) was improved by use of sulfolane (III) as solvent. Thus, heating 3 moles I, 3 moles II, 10% III, and 100ml O-xylene at 140≦̸C-150≦̸C gives II with dehydration rate 2.83 mole/hr and yield in 1 hr 70% ; compared with 1.42 and 35, resp., in the absence of III. III was also an excellent solvent for byproducts and residues, preventing fouling of app.

    PROCESS FOR THE PRODUCTION OF MALEIC ANHYDRIDE
    122.
    发明授权
    PROCESS FOR THE PRODUCTION OF MALEIC ANHYDRIDE 失效

    公开(公告)号：KR790001017B1

    公开(公告)日：1979-08-20

    申请号：KR740003218

    申请日：1974-07-30

    Applicant: UCB SA

    Inventor： VEKEMAN J ,  LEMAL R

    Abstract: Maleic anhydride was prepd. by the oxidn. of butane using a catalyst prepd. from V2O5 and P2O5 activated with Co, Ni or Cd. Thus, a mixt. of V2O5 65.1, HC1 1,000, CoC12.. H2O 32.3, and H3PO4 80.1 parts was refluxed, evapd. to dryness, dried for 12hr at 12≦̸C, and calcined for 4hr. at 350≦̸C. The residue was powdered and mixed with graphite to give a v-p-Co catalyst of ratio 1 ; 1. 14 ; 0. 19.

    Extraction of phosphoric acid at saline solutions state
    126.
    发明授权
    Extraction of phosphoric acid at saline solutions state 失效
    在海水溶液状态下提取磷酸

    公开(公告)号：US3767769A

    公开(公告)日：1973-10-23

    申请号：US3767769D

    申请日：1971-07-07

    Applicant: PECHINEY SAINT GOBAIN ,  UCB SA

    Inventor： WINAND L ,  GORET J

    IPC: C01B25/30 ,  C01B25/28 ,  C01B25/40 ,  C01B25/46 ,  C01B15/16 ,  C01B25/26

    CPC classification number: C01B25/46 ,  C01B25/28 ,  C01B25/405

    Abstract: A CONTINUOUS PROCESS FOR EXTRACTING ALKALI PHOSPHATES AS CONCENTRATED, PURE SOLUTIONSDERVIED FROM THE ACIDIC ATTACK ON NATURAL ROCK COMPRISING IN T HAT IN A FIRST SERIES OF COUNTERCURRENT FLOW EXTRACTORS IMPURE SOLUTIONS OF PHOSPHORIC ACID ARE TREATED WITH A SOLVENT WHILE A STRONG ACID IS INTRODUCED AT ONE OR MORE POINTS IN THE FIRST SERIES OF EXTRACTORS, EXTRACTING THE SOLUTION OF PHOSPHORIC ACID IN SAID SOLVENT IN COUNTERCURRENT FLOW WITH AQUEOUS SOLUTIONS C ONTAINING PHOSPHATE IONS AND ALKALI IONS WITHIN A SECOND SERIES OF COUNTERCURRENT FLOW EXTRACTORS, FIRST WASHING AND PARTIALLY EXTRACTING THE SOLUTION OF PHOSPHORIC ACID IN SAID SOLVENT WITH A STREAM OF PURE WATER IN A THIRD SERIES OF COUNTERCURRENT FLOW EXTRACTORS, ADDING THE WATER STREAM LOADED WITH PHOSPHORIC ACID TO THE STARTING IMPURE SOLUTIONS OF PHOSPHORIC ACID IN THE FIRST SERIES OF EXTRACTORS, RECYCLING THE SOLVENT LEAVING THE SECOND SERIES OF EXTRACTORS TO THE FIRST SERIES OF EXTRACTORS, COLLECTING EXHAUSTED SOLUTIONS OF PHOSPHORIC ACID CONTAINING THE STRONG ACID WHICH HAS BEEN ADDED AT THE OUTLET OF THE FIRST SERIES OF EXTRACTORS, AND COLLECTING PURE ALKALI PHOSPHATES AS CONCENTRATED SOLUTIONS AT THE OUTLET OF THE SECOND SERIES OF EXTRACTORS.

    Continuous process for the preparation of maleic anhydride from an aqueous solution of maleic acid by distillation
    127.
    发明授权
    Continuous process for the preparation of maleic anhydride from an aqueous solution of maleic acid by distillation 失效
    通过蒸馏从马来酸的水溶液中制备马来酸酐的连续方法

    公开(公告)号：US3642829A

    公开(公告)日：1972-02-15

    申请号：US3642829D

    申请日：1970-01-27

    Applicant: UCB SA

    Inventor： WEYENS ERNEST

    IPC: C07D307/60 ,  C07C51/31 ,  C07C51/56 ,  B01D3/34 ,  C07C57/14

    CPC classification number: C07C51/313 ,  C07C51/56 ,  C07C57/145

    Abstract: CONTINUOUS PROCESS FOR THE PREPARATION OF MALEIC ANHYDRIDE WHICH COMPRISES: (A) CONCENTRATING A MALEIC ACID SOLUTION (E.G. FROM WASHING EFFUENT OF CATALYTIC OXIDATION OF BENZENE) AT 100-150*C. AND 400-760 MM. HG; (B) CONVERTIG THE DEHYDRATED MALEIC ACID FROM (A) AT 150-200*C. AND 40-300 MM. HG INTO A LIQUID PHASE OF IMPURE MALEIC ACID AND A PURIFIED GASEOUS PHASE OF MALEIC ANHYDRIDE AND WATER VAPOUR; (C) TREATING THE LIQUID PHASE FROM (B) WITH MALEIC ACID, FILTERING OFF THE IMPURITIES INCLUDING ANY FUMARIC ACID AND EITHER RECYCLING THE PURIFIED MALEIC ACID FILTRATE PARTLY TO (A) AND PARTLY TO (B) OR REMOVING SAID FILTRATE FORM THE SYSTEM; (D) CONDENSING THE GASEOUS PHASE FORM (B) AT A TEMPERATURE ABOVE THE DEWPOINT OF WATER GIVING SUBSTANTIALLY PURE MALEIC ANHYDRIDE AND WASHING THE RESIDUAL VAPOUR WITH WATER AND EVENTUALLY RECYCLING THE SOLUTION CONTAINING MALEIC ACID TO (A).

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