RECOVERY OF HYDROGEN FROM FRACTIONATION ZONE OFFGAS

Methods and apparatus for increasing the recovery of hydrogen from fractionation section offgas are described. The methods include reducing the pressure of a liquid effluent from a high-pressure reaction zone, and introducing the effluent into a flash drum forming a low pressure liquid effluent. The...

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1. Verfasser:	HOEHN RICHARD K
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF CRACKING HYDROCARBON OILS FUELS INORGANIC CHEMISTRY LUBRICANTS METALLURGY MINERAL WAXES NON-METALLIC ELEMENTS PEAT PERFORMING OPERATIONS PETROLEUM, GAS OR COKE INDUSTRIES PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS REFORMING OF NAPHTHA TECHNICAL GASES CONTAINING CARBON MONOXIDE THEIR RELEVANT APPARATUS TRANSPORTING
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Zusammenfassung:	Methods and apparatus for increasing the recovery of hydrogen from fractionation section offgas are described. The methods include reducing the pressure of a liquid effluent from a high-pressure reaction zone, and introducing the effluent into a flash drum forming a low pressure liquid effluent. The low pressure effluent is introduced into a low-pressure stripper column, and separated into an overhead vapor stream and at least one additional stream. The stripper column overhead vapor stream is compressed in a one cylinder of a compressor, which has at least one additional cylinder, to an intermediate pressure. The compressed overhead stream is introduced to an intermediate pressure knockout drum forming a gas stream and a liquid stream. The gas stream is introduced into a pressure swing adsorption zone to produce a hydrogen rich gas stream at an intermediate pressure.