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    Method for the recovery of caprolactam
    1.
    发明授权
    Method for the recovery of caprolactam 失效
    恢复CAPROLACTAM的方法

    公开(公告)号：US3694433A

    公开(公告)日：1972-09-26

    申请号：US3694433D

    申请日：1971-08-27

    Applicant: ALLIED CHEM

    Inventor： BECKHAM LELAND J

    IPC: C07D201/16 ,  C07D41/06

    CPC classification number: C07D201/16

    Abstract: A process comprising the steps of: A. CONTACTING AT A TEMPERATURE RANGING FROM ABOUT 40* C. to about 90* C. a rearrangement mass comprising Epsilon caprolactam and sulfuric acid with the following reactants: (I) SUBSTANTIALLY WATER-FREE AMMONIUM SULFATE IN AN AMOUNT RANGING FROM ABOUT 0.9 TO ABOUT 1.1 MOLES PER MOLE OF SULFURIC ACID PRESENT IN SAID REARRANGEMENT MASS, AND (II) AN AQUEOUS AMMONIUM BISULFATE SOLUTION SATURATED AT A TEMPERATURE WITHIN THE RANGE OF 20* TO 55* C., the amount of said aqueous solution being such as to dissolve at the contacting temperature the ammonium bisulfate formed by the reaction of the sulfuric acid component of the rearrangement mass with said ammonium sulfate, to thereby afford an Epsilon -caprolactam phase and an aqueous ammonium bisulfate phase; B. SEPARATING SAID Epsilon -CAPROLACTAM PHASE; C. COOLING SAID AQUEOUS AMMONIUM BISULFATE PHASE TO A TEMPERATURE WITHIN THE RANGE OF 20* TO 55* C. to thereby afford crystalline ammonium bisulfate and a saturated aqueous ammonium bisulfate solution; D. RECOVERING AND RECYCLING SAID SATURATED AQUEOUS SOLUTION TO STEP A).

    Abstract translation: 一种方法，包括以下步骤：

    Cyclic process for producing potassium nitrate and ammonium chloride
    2.
    发明授权
    Cyclic process for producing potassium nitrate and ammonium chloride 失效
    生产硝酸钾和氯化铵的循环方法

    公开(公告)号：US3595609A

    公开(公告)日：1971-07-27

    申请号：US3595609D

    申请日：1969-10-13

    Applicant: ALLIED CHEM

    Inventor： BECKHAM LELAND J

    IPC: C01C1/16 ,  C01D9/10 ,  C01D9/16

    CPC classification number: C01C1/164 ,  C01D9/10

    Abstract: POTASSIUM CHLORIDE AND WATER AND ADDED TO A FIRST AQUEOUS NITRATE-CHLORIDE MOTHER LIQUOR HAVING A

    K+/(K++NH4+)

    MOL RATIO OF NOT MORE THAN ABOUT 0.37 TO FORM A POTASSIUM NITRATE CRYSTALLIZATION MEDIUM. THE MEDIUM IS COOLED TO PRECIPITATE CRYSTALLINE POTASSIUM NITRATE AND FORM A SECOND NITRATE-CHLORIDE MOTHER LIQUOR. AFTER SEPARATION OF THE POTASSIUM NITRATE, AMMONIUM NITRATE IS ADDED TO THE SECOND MOTHER LIQUOR, ALL ADDED WATER IS EVAPORATED TO FORM AN AMMONIUM CHLORIDE CRYSTALLIZATION MEDIUM, AND AMMONIUM CHLORIDE IS CRYSTALLIZED AT A TEMPERATURE HIGHER THAN THE POTASSIUM NITRITE CRYSTALLIZATION. THE AMMONIUM CHLORIDE IS SEPARATED, AND THE RESIDUAL MOTHER LIQUOR IS RECYCLED TO RECEIVE ADDITIONAL POTASSIUM CHLORIDE AND WATER. THE MAINTENANCE OF A NET BALANCE OF COM-

    PONENTS PERMITS CONTINUOUS OPERATION OF A CYCLIC METATHESIS OPERATION.

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