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    • 1. 发明授权
    • Process for producing p-xylene
    • 生产对二甲苯的方法
    • US4377718A
    • 1983-03-22
    • US285464
    • 1981-07-21
    • Kimihiko SatoTokuji SakaiYasuo YamasakiTamio OnoderaKoji Sumitani
    • Kimihiko SatoTokuji SakaiYasuo YamasakiTamio OnoderaKoji Sumitani
    • B01J29/00C07C1/00C07C2/86C07C15/08C07C67/00C07C2/68
    • C07C2/864C07C2/865C07C2529/44Y02P20/52Y02P20/584
    • In a process for producing p-xylene which comprises catalytically methylating toluene with a methylating agent in the gaseous phase, the improvement wherein(a) said methylation is carried out continuously in a multi-stage reaction system consisting of a plurality of separate series-connected fixed catalyst layers without separating the resulting xylenes in an intermediate stage,(b) said toluene is fed together with hydrogen gas into only the first-stage fixed catalyst layer and passed successively through the subsequent fixed catalyst layers, the amount of toluene fed being such that the total weight hourly space velocity of toluene is from 1 to 300 hr.sup.-1,(c) said methylating agent is fed into each of said fixed catalyst layers, if desired together with hydrogen gas, the amount of the methylating agent fed into each catalyst layer being 0.01/t moles to 1/t moles, in which t is the number of methyl groups in the methylating agent, per mole of toluene fed into the first-stage catalyst layer, and the total amount of the methylating agent fed into all of the catalyst layers being within the range of 0.1/t moles to 2/t moles, in which t is as defined, per mole of toluene fed into the first-stage catalyst layer, and(d) each fixed catalyst layer is filled with a catalyst composed of a crystalline aluminosilicate containing magnesium oxide or lanthanide oxide.
    • 在一种生产对二甲苯的方法中,其包括在气相中用甲基化剂甲苯化甲苯,其中(a)所述甲基化在多级反应体系中连续进行,所述多级反应体系由多个单独的串联 固定的催化剂层,而不在中间阶段分离所得的二甲苯,(b)将所述甲苯与氢气一起进入第一级固定催化剂层,并依次通过随后的固定催化剂层,进料的甲苯的量 甲苯的总重小时空速为1〜300小时-1,(c)如果需要,将所述甲基化剂与氢气一起进料到每个所述固定催化剂层中,将甲基化剂加入到每个 催化剂层为每摩尔进料到第一阶段催化剂中的甲苯为0.01 / t摩尔至1 / t摩尔,其中t为甲基化剂中的甲基数 并且进料到所有催化剂层中的甲基化剂的总量在0.1 / t摩尔至2 / t摩尔的范围内,其中t定义为每摩尔进料到第一阶段催化剂中的甲苯 层,并且(d)每个固定的催化剂层填充有由含有氧化镁或镧系元素氧化物的结晶硅铝酸盐组成的催化剂。
    • 9. 发明授权
    • Process for isomerization of xylene
    • 二甲苯异构化方法
    • US4300014A
    • 1981-11-10
    • US204018
    • 1980-11-04
    • Yasuo YamasakiTokuji SakaiTamio OnoderaKiji Sumitani
    • Yasuo YamasakiTokuji SakaiTamio OnoderaKiji Sumitani
    • B01J23/32B01J23/90B01J29/44B01J29/90B01J38/12B01J38/20C07B61/00C07C1/00C07C5/27C07C15/08C07C67/00C07C5/24
    • B01J29/90B01J23/32B01J29/44C07C5/2724Y02P20/52Y02P20/584
    • A process for isomerizing xylenes, which comprisescontacting an aromatic hydrocarbon feedstock containing mainly a xylene isomeric mixture containing ethylbenzene with a catalyst of a palladium-containing crystalline aluminosilicate in the vapor phase in the presence of hydrogen to continuously isomerize xylenes and simultaneously de-ethylate the ethylbenzene selectively;interrupting the isomerization reaction;introducing an oxygen-containing gas into a bed of the catalyst in which coke has been deposited during the isomerization reaction, to contact the catalyst with the oxygen-containing gas;burning off the coke deposits on the catalyst with the oxygen-containing gas by gradually increasing the temperature of introduction of the oxygen-containing gas from not more than 200.degree. C. to a temperature in the range of 330.degree. to 390.degree. C. with no part of the catalyst bed exceeding a maximum temperature of 400.degree. C. while controlling the hot spot temperature of the catalyst bed not to exceed 50.degree. C. throughout the burn-off period;reducing in hydrogen the catalyst from which the burnable coke deposits have been removed at least partly;andthereafter resuming the isomerization reaction in the presence of the regenerated catalyst.
    • 异构化二甲苯的方法,其包括在氢气存在下使主要含有乙苯的二甲苯异构体混合物的芳族烃原料与气相中的含钯结晶硅铝酸盐的催化剂接触,以连续异构化二甲苯,同时使二甲苯脱乙基化 乙苯选择性; 中断异构化反应; 在异构化反应期间将含氧气体引入已经沉积焦炭的催化剂床中,以使催化剂与含氧气体接触; 通过逐渐将含氧气体的引入温度从不高于200℃升温到330℃至390℃的温度,用含氧气体燃烧催化剂上的焦炭沉积物, 在整个燃烧期间,催化剂床的热点温度不超过50℃,催化剂床的任何部分超过最高温度400℃。 减少氢气,至少部分地将可燃焦炭沉积物从其中除去的催化剂; 然后在再生催化剂存在下恢复异构化反应。