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A Method to Produce Methane-Containing Gas

Patent Number: SU1215617

Inventor(s): Ernest Jurn (DK)

Applicant(s): Haldor Topsoe (DK)

Requested Patent: SU1215617

Application Number: SU19752185807 19751104

Priority Number(s): SU19752185807 19751104

IPC Classification: C07C1/04

EC Classification: C07C1/06

Equivalents: AR205595, BR7507253, CA1075906, DD122066, DE2549439, DK142501B, DK142501C, DK495675, FR2290410, IN142700, JP1278110C, JP51068502, JP59053245B

Application of 04.11.1975

Priority of ----

Published: 28.02.1986 in B.I. No. 8

Abstract

Hydrogen and carbon oxides are reacted to form methane by passing an inlet stream of preheated methanation synthesis gas together with a recycle stream of product gas through a catalyst bed in an adiabatic methanation reactor. The inlet temperature is between 250-350oC, the outlet temperature between 500-700oC. The recycle stream is withdrawn from the outlet stream after the latter has been cooled to a temperature between 250-350oC and being, however, at least 50oC above the dew point. A preferred means for withdrawing the recycle stream is an ejector driven by the inlet stream or by added steam.

A method is suggested to produce methane-containing gas by contacting a mixture of carbon monoxide and hydrogen, preliminary heated to 259-339C, with nickel catalyst at an elevated temperature and a pressure of 26-71 atm in an adiabatic reactor (the first step). The outgoing gas flow, which is carried off the first step at a temperature of 500-700C, is cooled to 250-350C, provided that its dew point lays below this temperature by not less than 51C, and transported to the second methanization step. To improve the process economic efficiency, a part of the cooled gas is injected into the first step reactor by means of steam or feed stream to provide a 500-700C temperature of the outgoing gas flow.