Production of H.sub.2 -rich gas

Details Production of H.sub.2 -rich gas Production of H.sub.2 -rich gas

1996-05-21

1998-04-28

Geist, Gary

Compositions

Gaseous compositions

Carbon-oxide and hydrogen containing

252374, 252376, 423652, C07C 102, C06D 102, C10J 102, C08J 6900

Patent

active

057440670

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION



Field of the Invention

This invention relates to the production of hydrogen-rich gas by the partial oxidation of a water saturated gaseous hydrocarbonaceous fuel or a mixture of water saturated gaseous hydrocarbonaceous fuel and a liquid hydrocarbonaceous fuel.
The production of hydrogen-rich gas by the partial oxidation of a liquid hydrocarbonaceous feed or a pumpable slurry of solid carbonaceous feed to produce a raw feed gas which is cleaned and purified and then reacted in a catalyst bed consisting of an alkali-metal promoted mixture of copper uranate and copper oxide to produce a product gas comprising about 20 to 60 mole % hydrogen along with water and acid gases is disclosed in coassigned U.S. Pat. No. 4,338,292. In coassigned U.S. Pat. No. 4,021,366, the process gas stream from the partial oxidation of a liquid hydrocarbon material or a slurry of solid carbonaceous feed is cooled, scrubbed, and water-gas shifted in a bed of low temperature catalyst followed by a bed of high temperature catalyst. In coassigned U.S. Pat. No. 5,152,976, refinery offgas is partially oxidized. However, none of these processes teach applicant's highly efficient process which saturates gaseous hydrocarbonaceous fuel with shift condensate that is heated by direct contact with the process gas stream, and which preheats the saturated gaseous hydrocarbonaceous fuel by indirect heat exchange with at least a portion of the shifted process gas stream prior to introducing the saturated preheated gaseous fuel into the partial oxidation gas generator either alone or as a mixture of saturated gaseous hydrocarbonaceous fuel and liquid hydrocarbonaceous fuel.


SUMMARY

This is a process for producing hydrogen-rich gas from a gaseous hydrocarbonaceous fuel having a minimum C/H wt. ratio of 3.3, such as refinery off-gas, or a mixture of gaseous and liquid hydrocarbonaceous fuel such that the C/H weight ratio in the mixture is greater than 3.3/1. When refinery off-gas and similar gaseous streams with or without mixture with a liquid hydrocarbonaceous fuel are gasified by partial oxidation, water, or steam, moderation is required in order to maintain the reducing mole ratio (H.sub.2 +CO/H.sub.2 O+CO.sub.2) of the process gas stream at a reasonable level to avoid producing excessive soot. This invention supplies the moderator to the gasifier cheaply and efficiently using direct shift condensate contact to pick up moisture into the feed gas using heat from the gas cooling and scrubbing of the syngas and transferring it to the vaporization of water into the feed gas. The heat used is low level heat which is normally discarded to the cooling water. Further, by saturating the fuel gas, there are reductions in the atomic ratio O/C in the partial oxidation gasifier, soot make, and required temperature moderator. The unit efficiency is thereby increased.
This is a partial oxidation process for the production of H.sub.2 -rich gas comprising the following steps:
(1) reacting by partial oxidation a fuel feed comprising a hydrocarbonaceous fuel having a minimum C/H weight ratio of 3.3 and comprising a stream of water saturated gaseous hydrocarbonaceous fuel or a mixed stream of said saturated gaseous hydrocarbonaceous fuel and a liquid hydrocarbonaceous fuel at a temperature in the range of about 2000.degree. F. to 2800.degree. F., and a pressure in the range of about 200 to 2500 psia, with a stream of substantially pure oxygen gas at an atomic ratio of oxygen gas to carbon in the fuel in the range of about 0.6 to 1.6, a weight ratio H.sub.2 O/fuel in the range of about 0.1 to 5.0, and including supplemental H.sub.2 O temperature moderator, wherein said partial oxidation reaction takes place in the reaction zone of a free-flow non-catalytic partial oxidation gas generator to produce a process stream of synthesis gas comprising H.sub.2, CO, CO.sub.2, H.sub.2 O, N.sub.2, H.sub.2 S, COS and particulate carbon, and having a reducing mole ratio H.sub.2 +CO/H.sub.2 O+CO.sub.2 in the range of about 5 to 15;
(2) quench coolin

REFERENCES:
patent: 5358696 (1994-10-01), Jahnke

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