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公开(公告)号：US4990632A
公开(公告)日：1991-02-05
申请号：US376338
申请日：1989-07-06
IPC分类号： C07C253/26
CPC分类号： C07D301/04 , C07D301/06 , C07D301/08 , C07D301/10
摘要： An improved process is provided for the production of oxides from hydrocarbons by reaction with oxygen, air or a gas enriched in oxygen relative to air, preferably the latter, in the presence of an oxidation catalyst. An alkane, e.g. propane, is converted to an alkene in a dehydrogenator. The product stream is introduced into an oxidation reactor. The product formed therein is recovered in a quench tower. The gas phase from the quench tower is treated in a PSA unit to form a gaseous stream containing the unreacted alkane, alkene, a minor amount of oxygen, i.e. less than about 2 percent by volume, and nitrogen if present in the feed to the oxidation reactor. The gaseous stream, which may or may not contain hydrogen depending on the adsorbent on the PSA unit, is introduced into a selective oxidation unit to remove the remaining oxygen and then recycled to the dehydrogenator. Hydrogen may be introduced into or removed from the PSA effluent, depending on the function of the adsorbent therein, to obtain an optimum concentration for introduction into the dehydrogenator. A preferred PSA system for use in the subject process comprises two parallel PSA units containing differnt adsorbents such that the gaseous stream formed in one PSA unit contians all of the hydrogen from the gas phase of the quench tower. The feed to the PSA units is divided disaproportionately so that the combined PSA effluent recycle streams contain the optimum concentration of hydrogen for the dehydrogenator.
摘要翻译： 提供了一种改进的方法，用于在氧化催化剂存在下，通过与氧气，空气或相对于空气富含氧的气体（优选后者）与烃反应生成氧化物。 烷烃，例如 丙烷转化为脱氢剂中的烯烃。 将产物流引入氧化反应器中。 其中形成的产品在骤冷塔中回收。 来自淬火塔的气相在PSA单元中进行处理以形成含有未反应的烷烃，烯烃，少量氧气（即小于约2体积％）的气态物流，以及如果存在于氧化物进料中的氮气 反应堆。 将取决于PSA单元上的吸附剂的可能含有或不含氢的气流引入选择性氧化装置以除去剩余的氧气，然后再循环至脱氢器。 取决于其中的吸附剂的功能，可以将氢气引入或从PSA流出物中除去，以获得用于引入脱氢器的最佳浓度。 在本发明方法中使用的优选PSA系统包括两个平行的PSA单元，其含有不同的吸附剂，使得在一个PSA单元中形成的气流能够承受来自骤冷塔的气相的全部氢气。 PSA单元的进料不成比例地分配，使得组合的PSA流出物再循环流含有用于脱氢剂的最佳氢浓度。
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2.发明授权
公开(公告)号：US4758252A
公开(公告)日：1988-07-19
申请号：US66446
申请日：1987-06-26
IPC分类号： B01D53/04 , B01D53/047
CPC分类号： B01D53/0446 , B01D53/0476
摘要： This invention relates to an energy efficient method of vacuum regenerating an adsorbent bed. In a typical process, the adsorbent bed undergoes an adsorption step, a vent step, and a vacuum purge step. According to the present invention, the energy of the usually discarded vent gas is used to raise a dense liquid from a lower tank to a higher tank. The potential energy of the raised liquid, upon returning from the higher tank to the lower tank, is used to generate a vacuum for vacuum regeneration of the adsorbent bed.
摘要翻译： 本发明涉及真空再生吸附床的能量效率方法。 在典型的方法中，吸附床经历吸附步骤，排气步骤和真空吹扫步骤。 根据本发明，通常废弃排放气体的能量用于将致密液体从下罐提升到较高的罐。 升高的液体在从较高的罐返回到下部罐时的势能用于产生用于吸附剂床真空再生的真空。
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3.发明授权Argon recovery from hydrogen depleted ammonia plant purge gas utilizing a combination of cryogenic and non-cryogenic separating means 失效利用低温和非低温分离装置的组合，从贫氢氨设备吹扫气体中回收氩气
公开(公告)号：US4687498A
公开(公告)日：1987-08-18
申请号：US832205
申请日：1986-02-24
CPC分类号： F25J3/0252 , B01D53/0476 , B01D53/229 , C01B23/00 , C01C1/0476 , F25J3/0219 , F25J3/0285 , B01D2253/108 , B01D2253/1126 , B01D2256/16 , B01D2256/18 , B01D2257/102 , B01D2257/7025 , B01D2259/40001 , B01D2259/40016 , B01D2259/40032 , B01D2259/40037 , B01D2259/40052 , B01D2259/40056 , B01D2259/40071 , B01D2259/402 , B01D2259/4146 , B01D2259/416 , F25J2205/40 , F25J2205/60 , F25J2205/80 , F25J2210/20 , Y02C20/20 , Y02P20/129 , Y02P20/132 , Y02P20/156 , Y02P20/52 , Y10S62/908 , Y10S62/934
摘要： An improved process is disclosed for argon recovery from an ammonia synthesis plant purge gas stream comprising hydrogen, nitrogen, argon, methane, and ammonia. This purge gas is conventionally subjected to ammonia absorption and a first membrane separation of hydrogen for recycle to the ammonia plant. The hydrogen depleted non-permeate gas stream from the first membrane separator, comprising the aforesaid four components, and any residual moisture from the ammonia absorption, is subjected, according to a first embodiment of the present invention, to the following steps: (i) Separation of methane and residual moisture and most of the nitrogen in the gas stream in a pressure swing adsorption system using molecular sieve or activated carbon material. (ii) Separation of most of the hydrogen in a second membrane separator. The separated hydrogen may be used as purge gas for regeneration of the pressure swing adsorption systems of step (i). (iii) Separation of the nitrogen and residual hydrogen by cryogenic distillation to obtain essentially pure liquid argon product. In a second embodiment, step (ii) above is eliminated and separation of hydrogen is accomplished by cryogenic separation in combination with step (iii). In a third embodiment, separation of most of the hydrogen is accomplished by metal hydride adsorption in place of membrane separation. The present process is equally applicable with minor modifications for the recovery of argon from ammonia synthesis plant purge gas streams, wherein PSA or cryogenic units are employed instead of the first membrane separator, in order to recover hydrogen for recycle to the ammonia synthesis plant.
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