Hydrogen recovery method for hydrogenation plant

Hydrogen recovery method for hydrogenation plant

  • CN 101,348,235 B
  • Filed: 07/19/2007
  • Issued: 08/07/2013
  • Est. Priority Date: 07/19/2007
  • Status: Active Grant
First Claim
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1. the hydrogen recycling method of a hydrogenation unit, this method may further comprise the steps:

  • A. the hydrogen make-up of being come by the hydrogen pipe network enters the reactive system [2] of hydrogenation unit, and reaction product enters high pressure hot separator [3] and carries out gas-liquid separation;

    B. separate the gas obtain by step a high pressure hot separator [3] and go into cold high pressure separator [4] through overcooling is laggard;

    The gas that is obtained by cold high pressure separator [4] is back to reactive system [2] through after boosting, and the liquid phase that obtains enters cold low separator [5] after reducing pressure;

    The hydrogen-rich gas that is obtained by cold low separator [5] enters hydrogen recovery system [8], and the recover hydrogen that obtains is back to reactive system [2] or is back to the hydrogen pipe network;

    C. separate the liquid obtain by step a high pressure hot separator [3] and entering thermal low-pressure separators [6] after through decompression, the gas that is obtained by thermal low-pressure separators [6] is gone into flash tank [7] through overcooling is laggard, and the flashed vapour that obtains is back to reactive system [2];

    The service temperature of described high pressure hot separator [3] is 150~

    400 ℃

    , and working pressure is 4.0~

    20MPa;

    The service temperature of described cold high pressure separator [4] is 35~

    60 ℃

    , and working pressure is 3.5~

    20MPa;

    The service temperature of described cold low separator [5] is 35~

    60 ℃

    , and working pressure is 0.70~

    5.0MPa;

    The service temperature of described thermal low-pressure separators [6] is 150~

    400 ℃

    , and working pressure is 0.70~

    5.0MPa;

    The service temperature of described flash tank [7] is 35~

    60 ℃

    , and working pressure is 0.70~

    5.0MPa.

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