Process for recovering hydrogen and liquefied petroleum gas from gaseous streams

Patent metadata

Field	Value
Publication number	US-10767124-B2
Application number	US-201715473800-A
Country	US
Kind code	B2
Filing date	Mar 30, 2017
Priority date	Mar 31, 2016
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

A process for recovery hydrogen and LPG from a gaseous separated hydroprocessed stream and a stripper gaseous stream and/or a fractionator gaseous stream by increasing the pressure of the stripper gaseous stream and/or the fractionator gaseous stream. Both streams or all three streams can be subjected to sponge absorption and hydrogen recovery in series.

First claim

The invention claimed is:

1. A process for recovering hydrogen comprising:
hydroprocessing a hydrocarbon feed stream in a hydroprocessing reactor to provide a hydroprocessed effluent stream;
separating said hydroprocessed effluent stream in a separation section comprising a separator to provide a liquid separated hydroprocessed stream and a gaseous separated hydroprocessed stream;
stripping said liquid separated hydroprocessed stream to provide a stripper gaseous stream having a pressure of about 0.35 MPa (gauge) to about 2.0 MPa (gauge);
increasing the pressure of the stripper gaseous stream to about 1.4 MPa (gauge) to about 6.9 MPa (gauge);
absorbing C 3 + hydrocarbons from said gaseous separated hydroprocessed stream and said stripper gaseous stream together by contact with a sponge oil in a sponge absorber, wherein said sponge absorber operates at an overhead pressure of between about 1.4 MPa (gauge) and about 6.9 MPa (gauge); and
recovering hydrogen from said gaseous separated hydroprocessed stream and said stripper gaseous stream together.

2. The process of claim 1 wherein said stripping step comprises condensing a stripper overhead stream and separating said stripper gaseous stream from a stripper liquid overhead stream.

3. The process of claim 2 further comprising fractionating said stripper liquid overhead stream to provide a fractionator gaseous stream and recovering C3+ hydrocarbons from said fractionator gaseous stream with said stripper gaseous stream and said gaseous separated hydroprocessed stream.

4. The process of claim 1 further comprising maintaining pressure of said absorption step by adjusting a control valve on an overhead line when an upstream pressure indicator controller does not match a set point.

5. The process of claim 1 , wherein said stripper gaseous stream is passed through an eductor to increase the pressure of said stripper gaseous stream.

6. The process of claim 1 further comprising absorbing acid gases from said stripper gaseous stream and said gaseous separated hydroprocessed stream together by contact with a solvent.

7. The process of claim 1 further comprising adsorbing impurities from hydrogen in said gaseous separated hydroprocessed stream and said stripper gaseous stream together.

8. The process of claim 1 wherein said separation step further comprises: separating said hydroprocessed effluent stream in a hot separator to provide a hot gaseous separated hydroprocessed stream and a hot liquid separated hydroprocessed stream; separating said hot gaseous separated hydroprocessed stream in a cold separator to provide a cold gaseous separated hydroprocessed stream and a cold liquid separated hydroprocessed stream and/or separating said hot liquid separated hydroprocessed stream in a hot flash drum to provide a flash hot gaseous separated hydroprocessed stream and a flash hot liquid separated hydroprocessed stream; and separating said flash hot gaseous separated hydroprocessed stream and/or said cold liquid separated hydroprocessed stream in a cold flash drum to provide a flash cold gaseous separated hydroprocessed stream, which is said gaseous separated hydroprocessed stream, and a flash cold liquid separated hydroprocessed stream, which is said liquid separated hydroprocessed stream.

9. The process of claim 1 further comprising separating said gaseous separated hydroprocessed stream in a cold flash drum to provide a cold gaseous separated hydroprocessed stream and a cold liquid separated hydroprocessed stream.

10. The process of claim 1 , wherein the stripper gaseous stream is passed to a compressor to increase the pressure of the stripper gaseous stream.

Assignees

• Uop Llc

Inventors

• Ladkat Kiran
• Tiwari Neeraj

Classifications

• C01B3/52

  by contacting with liquids; Regeneration of used liquids · CPC title

• C10G67/02 Primary

  plural serial stages only · CPC title

• C01B2203/065

  using hydrotreating, e.g. hydrogenation, hydrodesulfurisation · CPC title

• C10G2300/40

  Characteristics of the process deviating from typical ways of processing · CPC title