Integration of p-xylene production and subsequent conversion process
    52.
    发明授权
    Integration of p-xylene production and subsequent conversion process 失效
    整合对二甲苯生产和后续转化过程

    公开(公告)号:US6133470A

    公开(公告)日:2000-10-17

    申请号:US123281

    申请日:1998-07-28

    摘要: A process for producing terephthalic acid and/or dimethyl terephthalate includes contacting a toluene-containing reaction stream with a first catalyst under toluene disproportionation conditions to produce an intermediate product stream of para-xylene with negligible ortho-xylene. The first catalyst includes a crystalline molecular sieve which has an ortho-xylene diffusion rate of at least 50 minutes. The first catalyst can be modified by selectivation with a silicon compound or carbon compound. The intermediate product stream, without need for para-xylene purification, is oxidized to terephthalic acid or dimethyl terephthalate.

    摘要翻译: 用于制备对苯二甲酸和/或对苯二甲酸二甲酯的方法包括在甲苯歧化条件下使含甲苯的反应物流与第一催化剂接触,以产生具有可忽略的邻二甲苯的对二甲苯的中间产物流。 第一催化剂包括具有至少50分钟的邻二甲苯扩散速率的结晶分子筛。 可以通过用硅化合物或碳化合物的选择来修饰第一种催化剂。 不需要对二甲苯净化的中间产物流被氧化成对苯二甲酸或对苯二甲酸二甲酯。

    Process for the catalytic dehydrogenation of alkanes to alkenes with
simultaneous combustion of hydrogen
    58.
    发明授权
    Process for the catalytic dehydrogenation of alkanes to alkenes with simultaneous combustion of hydrogen 失效
    在同时燃烧氢气的情况下将烷烃催化脱氢成烯烃的方法

    公开(公告)号:US5527979A

    公开(公告)日:1996-06-18

    申请号:US423630

    申请日:1995-04-17

    IPC分类号: C07C5/333

    CPC分类号: C07C5/3337 C07C2529/44

    摘要: There is provided a process for the net catalytic oxidative dehydrogenation of alkanes to produce alkenes. The process involves simultaneous equilibrium dehydrogenation of alkanes to alkenes and combustion of the hydrogen formed to drive the equilibrium dehydrogenation reaction further to the product alkenes. In the present reaction, the alkane feed is dehydrogenated over an equilbrium dehydrogenation catalyst in a first reactor, and the effluent from the first reactor, along with oxygen, is then passed into a second reactor containing a metal oxide catalyst which serves to selectively catalyze the combustion of hydrogen. This particular mode of operation is termed a separate reactor, cofed oxygen mode. The equilibrium dehydrogenation catalyst may comprise platinum and the selective metal oxide combustion catalyst may contain bismuth, antimony, indium, molybdenum, or a mixture thereof.

    摘要翻译: 提供了用于烷烃的净催化氧化脱氢以产生烯烃的方法。 该方法包括将烷烃同时平衡脱氢至烯烃,形成氢气的燃烧以进一步促进产物烯烃的平衡脱氢反应。 在本反应中,烷烃进料在第一反应器中通过平衡脱氢催化剂脱氢,然后将来自第一反应器的流出物与氧气一起进入含有金属氧化物催化剂的第二反应器,该反应器用于选择性催化 燃烧氢气。 这种特定的操作模式被称为单独的反应器,共模氧气模式。 平衡脱氢催化剂可以包含铂,并且选择性金属氧化物燃烧催化剂可以含有铋,锑,铟,钼或它们的混合物。

    Process for desulfurizing Claus tail-gas
    59.
    发明授权
    Process for desulfurizing Claus tail-gas 失效
    Claus尾气脱硫工艺

    公开(公告)号:US5229091A

    公开(公告)日:1993-07-20

    申请号:US868432

    申请日:1992-04-15

    摘要: A process is disclosed for removing sulfur from tail-gas emitted from a Claus sulfur recovery process. First, the tail-gas is oxidized so as to convert sulfur therein to sulfur oxides. Oxidized tail-gas is directed into an absorber where a solid absorbent absorbs substantially all the sulfur oxides thereon. After allowing sufficient time for a desired amount of sulfur oxides to be absorbed, absorption is ceased. Next, the solid absorbent containing the absorbed sulfur oxides is contacted with a reducing gas so as to release an off gas containing hydrogen sulfide and sulfur dioxide. Upon releasing sulfur from the solid absorbent, the solid absorbent is regenerated and redirected into the absorber. Sulfur in the off gas emitted by regeneration is concentrated to an extent sufficient for use within a Claus sulfur recovery process for conversion to elemental sulfur. By combining this process with a Claus sulfur recovery process, sulfur dioxide emissions can be reduced to less than about two parts per million.

    摘要翻译: 公开了从克劳斯硫回收过程中排出的尾气中除去硫的方法。 首先,尾气被氧化,以便将硫转化为硫氧化物。 将氧化尾气引入吸收器中,其中固体吸收剂基本上吸收其上的所有硫氧化物。 在允许足够的时间吸收所需量的硫氧化物之后,停止吸收。 接下来,将含有吸收的硫氧化物的固体吸收剂与还原气体接触,以释放含有硫化氢和二氧化硫的废气。 从固体吸收剂中释放出硫后,固体吸收剂被再生并重定向到吸收体中。 通过再生发出的废气中的硫浓缩至足以在克劳斯硫回收过程中用于转化成元素硫的程度。 通过将该方法与克劳斯硫回收方法相结合,可将二氧化硫排放量减少至少于百万分之二。