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    • 75. 发明申请
    • AGENTS FOR REDUCING ATMOSPHERIC OXIDISING POLLUTANTS
    • 用于减少大气氧化污染物的试剂
    • WO2002092198A1
    • 2002-11-21
    • PCT/GB2002/002147
    • 2002-05-15
    • JOHNSON MATTHEY PUBLIC LIMITED COMPANYTWIGG, Martyn, Vincent
    • TWIGG, Martyn, Vincent
    • B01D53/60
    • B01D53/8675B01D53/60B01D53/66B01D53/8653B01D2255/20761B01J23/80B01J37/0215B01J37/0225Y02C20/20
    • A method of reducing atmospheric oxidising pollutants comprises contacting an atmospheric oxidising pollutant, such as ozone, with a precious metal-free reducing agent, wherein the reducing agent comprises at least one transition element and/or one or more compounds including at least one transition element wherein the standard electrode potential of the redox reaction including the transition element and an ionic species of the transition element or between the ionic species of the transition element present in the or each compound and a further ionic species of the transition element is less than +1.0 volt. Illustrative reducing agents include a mixture of, optionally reduced, copper (II) oxide and zinc oxide on an alumina support, copper (II) oxide per se , and iron oxide on a mixed alumina/ceria support or a mixture of any two or more thereof.
    • 减少大气氧化污染物的方法包括将大气氧化污染物如臭氧与不含贵金属的还原剂接触,其中所述还原剂包含至少一种过渡元素和/或一种或多种化合物,其包括至少一种过渡元素 其中包括过渡元素的氧化还原反应的标准电极电位和过渡元素的离子种类或存在于或每种化合物中的过渡元素的离子种类和过渡元素的另外的离子种类之间的离子种类小于+1.0 伏特。 说明性的还原剂包括氧化铝载体上氧化铜(II)和氧化锌(任选还原的)的混合物,氧化铝上的氧化物和二氧化铈载体上的氧化铁, 任何两种或更多种的混合物。
    • 79. 发明申请
    • PROCESS FOR THE PRODUCTION OF SULFUR
    • 硫磺生产工艺
    • WO01030692A2
    • 2001-05-03
    • PCT/US2000/029022
    • 2000-10-20
    • B01D53/14B01D53/86C01B17/04C01B17/60
    • C01B17/0413B01D53/1456B01D53/8615C01B17/0404C01B17/0456Y02C20/20
    • A process is provided for producing elemental sulfur from hydrogen sulfide contained in an acid gas feed stream wherein hydrogen sulfide and sulfur dioxide are reacted in a catalytic only sulfur recovery unit comprising a single catalytic converter containing a Claus catalytic reaction zone. A sulfur dioxide-enriched gas recovered from tail gas treatment is recycled and introduced into the catalytic reaction zone as part of a feed gas mixture that also includes the acid gas feed stream. Temperatures within the catalytic reaction zone are effectively moderated by recycle of tail gas effluent to the converter so that high concentrations of hydrogen sulfide in the acid gas feed stream can be tolerated and improved process flexibility and capacity are realized. A pretreatment process including contacting the acid gas with an aqueous acid wash to reduce the concentration of unsaturated hydrocarbons in the acid gas and inhibit deactivation of the oxidation catalyst is also disclosed.
    • 提供了一种用于由酸性气体进料流中所含的硫化氢产生元素硫的方法,其中硫化氢和二氧化硫在仅含催化剂的硫回收单元中反应,所述单元催化转化器含有克劳斯催化反应区。 从尾气处理回收的富含二氧化硫的气体被循环并引入到催化反应区中,作为还包含酸性气体进料流的进料气体混合物的一部分。 催化反应区内的温度通过将尾气排放物再循环到转化器来有效地缓和,使得酸性气体进料流中的高浓度硫化氢可以被容忍并且提高了工艺的灵活性和容量。 还公开了一种预处理方法,其包括使酸性气体与含水酸洗液接触以降低酸性气体中的不饱和烃的浓度并抑制氧化催化剂的失活。