Hydrogasification

Table 18. Gas Composition and Yield from Integrated Hydrogasification Process at Stage T...

In general terms, as the molecular weight of the feedstock is increased, similar operating conditions of hydrogasification lead to decreasing hydrocarbon gas yields, increasing yields of aromatic Hquids, with carbon also appearing as a product. 

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

Coal can be processed to H2 by heat from a high temperature, gas-cooled reactor at a process efficiency of 60—70%. Process steps are coal hquefaction, hydrogasification of the Hquid, and steam reforming of gaseous products (179). 

Chemistiy of Coal Utilization, 2d suppl. voL, Lowry [ed.], Wiley, New York, 1963) that there are three fundamental reactions the Boudouard reaction (27-17), the heterogeneous water-gas reaction (27-18), and the hydrogasification reaction (27-15). The eqmlibrium constants for these reactions are sufficient to calculate all the reactions listed. 

The hydrogasification reactor operates at pressures of 1000-1500 psig and at temperatures of 760°-982°C in order to obtain the proper reaction rates and yields of methane required for process optimization. About 50% of the feed carbon is converted to gases in the hydrogasifier. 

Methanation Section Test Conditions. To date, the HYGAS pilot plant has been operated with Montana lignite coal feed. This lignite is a low sulfur (usually less than 1 wt % ) coal which has good reactivity for hydrogasification. The coal is nonagglomerating (thus eliminating the need for pretreatment), and it represents the lowest rank of U. S. coals that are available for conversion to substitute natural gas. 

Hydrogasification Process), Final Report HYGAS 381, Washington, ID.C. 

Hydrogasification Process, Amer. Chem. Soc., Div. Fuel Chem. Prepr. 10, 235-245 (1966) September. 

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... 

GRH A process for increasing the calorific value of a lean gas to make it suitable for use as a town gas, by thermal hydrogasification. Developed by British Gas. 

Hydrofoil impellers, 16 673—674 Hydroformulation, 13 768 Hydroformylation, 10 598 allyl alcohol, 2 236—237 ionic liquids in, 26 882—885 maleic anhydride, 15 492 metal carbonyls in, 16 72—73 rhodium-catalyzed, 19 647 Hydroformylation reactions, 13 448 Hydrogasification, coal, 13 845 Hydrogel-based drug delivery,... 

Hydrogasification. Hydrogasification of coal involves reaction of hydrogen with coal carried out at elevated temperatures under high partial pressure of hydrogen. The objective is to add sufficient hydrogen to coal to produce methane as the major product. It has been found that many types of coal can be hydrogasi-fied if the coal is heated rapidly to reaction temperatures. Even under favorable conditions, however, conversion to methane is not complete and aromatics such as benzene are made as by-products. 

Hydrogasification of coal is also a very exothermic reaction. One means of absorbing the heat of reaction is to use a fluidized bed reactor and inject hydrogen and coal reactants at sufficiently low temperature so that the sensible heat required to heat coal and hydrogen to reaction temperature is equivalent to the heat of reaction. 

Hydrogenation Hydroformylation 100-300 edible oils hydrogasification hydrocracking desulfurization catalytic cracking naphtha hydroforming coal liquefaction fatty alcohols 1-6-hexanediol 1-4-butanediol hexamethylenedi amine C4 to Cl5 products... 

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