Hydrogen purification for make-up gas in hydroprocessing processes

Hydrogen purification for make-up gas in hydroprocessing processes

  • CN 101,273,113 B
  • Filed: 07/11/2006
  • Issued: 06/17/2015
  • Est. Priority Date: 07/20/2005
  • Status: Active Grant
First Claim
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1. the method for hydrogenation incoming flow in hydrotreating reactor, incoming flow comprises heavy hydrocarbon liquid composition and hydrogen gas input component, this hydrogen gas input component comprises recycle hydrogen air-flow and hydrogen make-up air-flow, this reactor generate reactor discharging current, described reactor discharging current is separated into expel liquid stream and Exhaust Gas stream, described Exhaust Gas stream comprises unreacted hydrogen, methane and heavy hydrocarbon, and described method comprises:

  • A, Exhaust Gas stream and hydrogen make-up air-flow are compressed the recycle gas stream generating compression in circulating air compressor, the recycle gas stream of described compression contains from the unreacted hydrogen of Exhaust Gas stream, methane and heavy hydrocarbon, and from the hydrogen make-up of hydrogen make-up air-flow;

    B, the temperature range recycle gas stream of compression being cooled between+30 °

    F (-1.1 DEG C) to-40 °

    F (-40 DEG C);

    C, by the compression cycle gas stream of cooling with containing C 4-C 5the lean liquid solvent stream of hydrocarbon component contacts in uptake zone, to absorb methane and heavy hydrocarbon from the recycle gas stream of described compression, thus the hydrogen-rich gas stream generated containing 90-99mol% hydrogen and liquid-rich solvent streams;

    D, from uptake zone reclaim hydrogen-rich gas stream;

    E, hydrogen-rich gas stream is joined in hydrotreating reactor incoming flow as hydrogen gas input component;

    WithF, at least one flash stage liquid-rich solvent streams described in flash distillation, to produce containing C 4to C 5the lean liquid solvent stream of hydrocarbon component, is used for contacting with the compression cycle gas stream of cooling in step (c), and generates methane and heavy hydrocarbon gaseous product flow.

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