isothermal shift reactor conversion

Forums Process & Operational Ammonia isothermal shift reactor conversion

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  • #43568
    Participant

    Does anybody know what is the per-pass conversion of CO in the isothermal shift reactor offered by Linde or Topsoe?

    is the only reaction happening inthis reactor CO+ h2o = co2 + h2? if not, what are the other reactions. I believe a copper based catalyst is used here and reactor is operated between 250-300C

    #44146
    Participant

    To get started I’d look to the advice from Max Appl’s 1999 book, “Ammonia Principles and Industrial Practice“:

    4.2.1.3. Intermediate-Temperature Shift (ITS)
    A relatively new process concept is the intermediate temperature shift [627], [628], which performs the reaction in a single step. The catalyst is based on a copper-zinc-alumina formulation and optimized for operating in a wider temperature range (200 – 350 “C) than the standard LTS catalyst (190 – 275 “C). The reaction heat can be removed by use of a tube-cooled reactor raising steam or heating water for gas saturation to supply process steam in the reforming section (Linde LAC, ICI Catalco LCA). In a new plant using the spiral-wound Linde reactor [629], a methane slip of only 0.7 mol % (dry basis) is achieved.

    However, Appl is in error regarding the reference to “methane slip”. Referring to the source document [629], Ilg & Kandziora, Linde Ammonia Concept, 41st AIChE Ammonia Safety Symposium, Boston 1996; Ammonia Plant Safety vol.37 (1997) pp.341-352, on p. 344, the following is noted:

    Linde Isothermal Reactor

    This reactor (Figure 8) is used for the CO shift reaction, and allows conversion to below 0.7% CO (dry basis) in a single step.

    The reaction involved is primarily water gas shift, however, as with any shift reaction there are potential side reactions, such as methanol formation and Fischer-Tropsch. One of the claimed benefits of an iso-shift reactor is that the avoidance of HT shift conditions reduces the quantity of contaminants formed by side reaction.

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