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    Process for the production and recovery of ortho-xylene,para-xylene and ethylbenzene
    6.
    发明授权
    Process for the production and recovery of ortho-xylene,para-xylene and ethylbenzene 失效
    对羟基苯甲酸，对二甲苯和乙苯的生产和回收方法

    公开(公告)号：US3707550A

    公开(公告)日：1972-12-26

    申请号：US3707550D

    申请日：1971-10-26

    Applicant: UNIVERSAL OIL PROD CO

    Inventor： STINE LAURENCE O ,  BROUGHTON DONALD B

    IPC: B01D15/00 ,  B01J23/00 ,  B01J27/00 ,  C07C1/00 ,  C07C5/27 ,  C07C7/00 ,  C07C7/13 ,  C07C15/067 ,  C07C15/08 ,  C07C67/00 ,  C07C7/12

    CPC classification number: C07C7/005 ,  C07C7/13 ,  Y02P20/52 ,  C07C15/067

    Abstract: A MODIFIED DUAL ADSORPTION AND ISOMERIZATION PROCESS EMPLOYING A COMBINATION OF AN ORTHO-XYLENE SEPARATION ZONE AND A FIRST ADSORPTION ZONE IN COMMUNICATION WITH A SECOND ADSORPTION ZONE AND AN ISOMERIZATION ZONE. THE PROCESS IS SUITABLE FOR THE SEPARATION OF VARIOUS C8 AROMATIC ISOMERS INTO INDIVIDUAL RELATIVELY PURE STREAMS CONTAINING THE INDIVIDUAL ISOMERS. THE ORTHO-XYLENE SEPARATION ZONE SEPARATES ORTHO-XYLENE FROM THE OTHER C8 AROMATIC ISOMERS CONTAINED IN THE FRESH FEED AND RECYCLE FEED AND PASSES THE REMAINING C8 AROMATIC ISOMERS TO A FIRST ADSORPTION ZONE. THE FIRST ADSORPTION ZONE THEN SEPARATES PARA-XYLENE AND ETHYLBENZENE FROM META-XYLENE AND PASSES THE PARA-XYLENE AND ETHYLBENZENE TO A SECOND ADSORPTION ZONE WHEREIN PARA-XYLENE AND ETHYLBENZENE ARE SEPARATED INTO RELATIVELY PURIFIED PARA-XYLENE AND ETHYLBENZENE STREAMS. THE REMAINING META-XYLENE SEPARATED FROM THE PARA-XYLENE IN THE FIRST ADSORPTION ZONE IS PASSED INTO AN ISOMERIZATION ZONE TO EFFECT THE PRODUCTION OF ADDITIONAL C5 AROMATIC ISOMERS WHICH ARE RECYCLED TO AND SEQUENTIALLY SEPARATED BY THE ORTHO-XYLENE SEPARATION ZONE AND THE FIRST AND SECOND ADSORPTION ZONES, ALLOWING INCREASED YIELDS OF SOME OF THE C8 AROMATICS BASED ON FRESH FEED TO THE ORTHO-XYLENE ZONE. THE MODIFICATION BASICALLY COMPRISES SEPARATING AND REMOVING ORTHO-XYLENE FROM

    THE FEED TO THE ISOMERIZATION ZONE THUS ALLOWING THE PRODUCTION OF ADDITIONAL ORTHO-XYLENE IN SAID ZONE AND THEREBY RESULTING IN A HIGHER OVERALL YIELD OF ORTHO-XYLENE BASED ON FRESH FEED THAN THAT RESULTING IF ORTHO-XYLENE WERE NOT SEPARATED AND REMOVED.

    Simultaneous recovery and production of pure xylenes from a c aromatic mixture
    7.
    发明授权
    Simultaneous recovery and production of pure xylenes from a c aromatic mixture 失效
    同时恢复和生产来自C型芳香族混合物的纯二甲苯

    公开(公告)号：US3700744A

    公开(公告)日：1972-10-24

    申请号：US3700744D

    申请日：1970-09-18

    Applicant: UNIVERSAL OIL PROD CO

    Inventor： BERGER CHARLES V ,  BROUGHTON DONALD B

    IPC: C07C7/00 ,  C07C7/13 ,  C07C15/08

    CPC classification number: C07C15/08 ,  C07C7/005 ,  C07C7/13

    Abstract: Each xylene isomer, in relatively pure form, is recovered and produced from a C8 mixture containing the same and ethylbenzene by a combination of fractionation and selective zeolitic molecular sieve separation involving fractionation of a C8 aromatic stream to produce an ortho-xylene free, ethylbenzene, meta-xylene and para-xylene fraction for subsequent isomerization, a relatively pure ortho-xylene fraction and a mixed, ortho-xylene and ethylbenzene free, meta-xylene and paraxylene fraction which is further separated by selective zeolitic adsorption.

    Abstract translation: 相对纯的形式的每个二甲苯异构体通过分馏和选择性沸石分子筛分离的组合从包含相同和乙苯的C8混合物中回收和生产，包括分馏C8芳族物流以产生邻二甲苯游离的乙苯， 间二甲苯和对二甲苯馏分，用于随后的异构化，相对纯的邻二甲苯馏分和混合的邻二甲苯和无乙苯，间二甲苯和对二甲苯馏分，其通过选择性沸石吸附进一步分离。

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