Hydrogasification, direct

In ensuing catalytic stages, usually termed hydrogasrfication and methanation (not to be confused with the noncatalytic, direct hydrogasification processes... 

Direct production of methane from coal is called coal hydrogasification. Several technologies have been developed to make city gas from coal. The main reaction in coal hydrogasification is... 

The concept is a dilute-phase hydrogasification process in which coal is directly reacted with hydrogen to produce maximum yield of methane in the reactor. We are not, as an organization, competitive with industry either in hardware or in process work. 

In this process, gasification is carried out in the presence of hydrogen. Most of the research on hydrogasification has targeted methane as the final product. One approach involves the sequential production of synthesis gas and then methanation of the carbon monoxide with hydrogen to yield methane. Another route involves the direct reaction of the feed with hydrogen (Feldmann et al,... 

Results of our most recent FDP reactor operations are summarized in Table I and the analyses of the feed coals used are listed in Table II. The main objectives of these experiments were (1) to establish the feasibility of directly producing a high Btu gas by hydrogasifying raw coal in a continuous reactor at economical pressures, (2) to measure the yields and distribution of coal hydrogasification reaction products, and (3) to provide data for scaling up the FDP reactor. 

This kinetic study of catalyzed hydrogasification reactions utilizes a high temperature, high pressure recording balance. A thermobalance is particularly useful in gas-solid reactions because the weight of small solid samples can be measured continuously. Direct kinetic analysis of the weight loss curves are straightforward. 

In the direct hydrogasification experiments, hydrogen is fed into the distributor at the bottom of the gasifier. As the data in Table II show, there is no great difference in gas compositions between the tests in which pure steam is the feed gas and those in which pure hydrogen is used. However, because of the gas/solids contact in the 3-inch I.D. reactor, there is a considerable difference in the gas composition seen by the wood particles as... 

The production of methane from coal does not depend entirely on catalytic methanation, and, in fact, a number of gasification processes use hydrogasification, that is, the direct addition of H2 to coal under pressure to form methane (Anthony and Howard, 1976) ... 

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