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    Process for improving olefin etherification catalyst life
    83.
    发明授权
    Process for improving olefin etherification catalyst life 失效
    改进烯烃醚化催化剂寿命的方法

    公开(公告)号：US5300126A

    公开(公告)日：1994-04-05

    申请号：US963955

    申请日：1992-10-19

    Applicant: Stephen H. Brown ,  Quang N. Le ,  Lawrence B. Alemany

    Inventor： Stephen H. Brown ,  Quang N. Le ,  Lawrence B. Alemany

    IPC: C07C51/347 ,  C07C51/567 ,  C10L1/14 ,  C10L1/16 ,  C10L1/18 ,  C10L1/188 ,  C10L1/20 ,  C10L1/22 ,  C10L1/24

    CPC classification number: C10L1/1883 ,  C07C51/347 ,  C07C51/567 ,  C10L1/14 ,  C10L1/18 ,  C10L1/1608 ,  C10L1/1824 ,  C10L1/1852 ,  C10L1/1857 ,  C10L1/1881 ,  C10L1/19 ,  C10L1/1905 ,  C10L1/201 ,  C10L1/204 ,  C10L1/205 ,  C10L1/224 ,  C10L1/2286 ,  C10L1/231 ,  C10L1/2437 ,  C10L1/245

    Abstract: A method is disclosed for the pretreatment of olefinic hydrocarbon feedstock to remove conjugated dienes and/or basic nitrogen compounds that deactivate acidic catalyst particles used in olefin conversion processes by reacting the dienes with one or more dienophiles to form the corresponding Diels-Alder adduct, followed by catalytic conversion of the olefinic hydrocarbon feedstock containing the adduct. The formation of the Diels-Alder adduct essentially eliminates the role of dienes in the feedstock as catalyst deactivating agents. When maleic anhydride (MA) is employed as the dienophile, basic nitrogen reacts with maleic anhydride, or with the tetrahydrophthalic anhydride adduct, to lower the amount of catalyst deactivating basic nitrogen compounds in the feedstock. Where the olefin conversion process comprises etherification of isoolefins with alkanol in a C.sub.4 + or C.sub.5 + olefinic hydrocarbon feedstream to produce a gasoline boiling range product enriched in oxygen and rich in high octane value alkyl tertiary alkyl ethers, it has been discovered that the adduct, particularly those adducts formed with MA, is in the gasoline boiling range and contributes usefully to the oxygen enrichment of the gasoline and to octane value.

    Abstract translation: 公开了一种用于预处理烯烃原料以除去共轭二烯和/或碱性氮化合物的方法，其通过使二烯与一种或多种亲双烯体反应形成相应的狄尔斯 - 阿尔德加合物，使烯烃转化过程中使用的酸性催化剂颗粒失活，随后 通过催化转化含有加合物的烯烃原料。 Diels-Alder加合物的形成基本上消除了二烯在原料中作为催化剂失活剂的作用。 当使用马来酸酐（MA）作为亲二烯体时，碱性氮与马来酸酐或四氢邻苯二甲酸酐加合物反应，以降低原料中催化剂失活碱性氮化合物的量。 当烯烃转化方法包括在C4 +或C5 +烯烃原料流中异构烯烃与烷醇的醚化以产生富含氧并富含高辛烷值烷基叔烷基醚的汽油沸程产物时，已经发现加合物，特别是那些 与MA形成的加合物处于汽油沸点范围内，有助于汽油的富氧和辛烷值。

    Thermal stabilization of tetramethyllead
    90.
    发明授权
    Thermal stabilization of tetramethyllead 失效

    公开(公告)号：US3745185A

    公开(公告)日：1973-07-10

    申请号：US3745185D

    申请日：1972-03-03

    Applicant: ETHYL CORP

    Inventor： COOK S ,  SISTRUNK T

    IPC: C07F7/24 ,  C10L1/14 ,  C10L1/16 ,  C10L1/20 ,  C10L1/30

    CPC classification number: C07F7/24 ,  C10L1/14 ,  C10L1/1608 ,  C10L1/201 ,  C10L1/306

    Abstract: TETRAMETHYLLEAD IN CONCENTRATED FORM, ESPECIALLY WHEN UNDER CONFINEMENT, IS STABILIZED AGAINST PRONOUNCED THERMAL DECOMPOSITION AT ELEVATED TEMPERATURE BY MAINTAINING IT IN INTIMATE CONTACT WITH SUITABLE AMOUNTS OF CERTAIN HYDROCARBONS (B.PB CA. 90-150* C.) SUCH AS TOULENE AND ISOOCTANE. EQUIMOLAR TETRAMETHYLLEAD-ETHYLENE DIBROMIDE CONCENTRATES VIOLENTLY EXPLODED WHEN HEATED UNDER CONFINEMENT TO 295-305*C. INCLUSION OF THE HYDROCARBON IN APPROPRIATE CONCENTRATIONS, IN SOME CASES WITH ETHYLENE DICHLORIDE REPLACING PART OF THE ETHYLENE DIBROMIDE, ELIMINATED THIS EXPLOSIVE DECOMPOSITION AND RAISED THE TEMPERATURE AT WHICH PRONOUNCED, NONEXPLOSIVE THERMAL DECOMPOSITION COMMENCED.

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