Cryogenic operating temperature

Forums Process & Operational Ammonia Cryogenic operating temperature

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  • #49132
    Participant

      Hello everyone,

      In oil base ammonia plant there is one section called nitrogen wash section, which is operated at 75 bar & -188C , The question is why does it operated at such a low temperature , at 75 bar variety of temperature range available in which N2 can be in liquid phase.

      #49171
      Participant

        From what I know, this process was patented by Bernard Grotz, Jr., back in 1969 for the CF Braun company:

        Refer Figure 2 and the supporting text in the patent.

        CF Braun made its way through various hands and is now part of KBR, who have adopted the “purifier” process as a core part of their hydrocarbon fed ammonia technology.

        If you can find this paper:
        Gosnell, J. & Malhotra, A., KBR’s New PURIFIERplus Process, Nitrogen Conference, Vienna, Austria, 12-15 March 2006
        It will give you an update of development of the process in the intervening 35 years but the core tech was pretty well in the same basic state after it left the hands of Grotz. So, that’s a clearly positive testament to the robustness of the original design.

        I’ll leave you to review the detail. The answer to your question is covered by the patent.

        #49176
        Participant

          From what I know, this process was patented by Bernard Grotz, Jr., back in 1969 for the CF Braun company:

          Refer Figure 2 and the supporting text in the patent.

          CF Braun made its way through various hands and is now part of KBR, who have adopted the “purifier” process as a core part of their hydrocarbon fed ammonia technology.

          If you can find this paper:
          Gosnell, J. & Malhotra, A., KBR’s New PURIFIERplus Process, Nitrogen Conference, Vienna, Austria, 12-15 March 2006
          It will give you an update of development of the process in the intervening 35 years but the core tech was pretty well in the same basic state after it left the hands of Grotz. So, that’s a clearly positive testament to the robustness of the original design.

          I’ll leave you to review the detail. The answer to your question is covered by the patent.

          For the Grotz patent, search for:
          US3442613 Grotz, CF Braun, Hydrocarbon Reforming for Production of a Synthesis Gas from which Ammonia can be Prepared

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