Abstract:
Improved process for the production of substantially pure methane or clean synthetic natural gas (SNG) including the steps of partial oxidation of a hydrocarbonaceous fuel feed with substantially pure oxygen to produce a process gas stream comprising principally H2, and CO and having a critical mole ratio H2/CO in the range of 1.0 to below 1.5 and preferably 1.0 to 1.3; cooling the process gas stream and separating H2O, CO2 particulate carbon and gaseous impurities therefrom, reacting together the H2 and CO in said process gas stream in a catalytic methanation zone to produce a methane-rich gas stream containing gaseous impurities selected from the group consisting primarily of H2O, and CO2, along with minor amounts of H2, CO, N2, and Ar and mixtures thereof; and removing said H2O and CO2 to produce a product gas stream comprising substantially pure methane i.e. 95 mole % or higher (dry basis). The product gas may be used as a clean substitute natural gas having a gross heating value of about 980 BTU/SCF or higher.
Abstract:
A methane-rich gas stream is produced by catalytic methanation of synthesis gas feed comprising H2 and CO. When the mole ratio H2/CO of the synthesis gas feed is in the range of about 0.5 to 1.15, by adjusting the mole % H2O in the synthesis gas feed to a value in the range of about 0.1 to 15., the gross heating value of the product gas may be increased to a value above that obtained with a dry substantially CO2-free methanator feed gas. This effect of adding H2O becomes more pronounced as the H2/CO ratio drops further below the maximum value of 1.13. Further, in a preferred embodiment the gross heating value of the product gas (with H2O and CO2 removed) was maximized by adjusting the mole % H2O in the synthesis gas feed to the methanator to a critical value in the range of 1.0 to 3.0 and preferably 2.0 while maintaining the H2/CO mole ratio of the synthesis gas feed at a critical value in the range of about 1 to 1.15 and preferably 1.13.
Abstract:
A methane-rich gas stream is produced by catalytic methanation of synthesis gas feed comprising H2 and CO. When the mole % CO in the synthesis gas feed to the methanator is greater than 10 mole %, and the mole ratio H2/CO is in the range of greater than 1.0 to 3, by adjusting the mole % CO2 in the synthesis gas feed to the methanator to a value in the range of about 0.5 to 20, and the mole ratio H2/CO2 in the range of about 2 to 60 and preferably less than 3.9 it was unexpectedly found that a product gas is produced having a gross heating value which is greater than that which is obtained from a dry CO2-free methanator feed gas.
Abstract:
Improved process for the production of a methane-rich product gas stream comprising the following steps: partial oxidation of a hydrocarbonaceous fuel feed employing a H2O/fuel weight ratio of 2.2 to 2.9 and an atomic ratio of oxygen in the substantially pure oxygen to carbon in the fuel of 0.80 to 0.84 to produce a process gas stream comprising principally H2, CO and CH4 in which the mole ratio H2/CO is 1 to 2.5, the mole % CH4 is 15 or more, and the particulate carbon is 13 weight % (basis carbon in the fuel) or less; cooling the process gas stream and separating H2O, CO2, carbon, and gaseous impurities; reacting together the H2 and CO in said process gas stream in a catalytic methanation zone to produce a methane-rich gas stream principally comprising CH4 and containing gaseous members selected from the group consisting of H2, CO, H2O, CO2, and mixtures thereof; and removing said H2O and CO2 to produce a methane-rich product gas stream comprising about 93 mole percent of CH4. By means of the subject invention there is produced a high heating value clean fuel gas or a substitute natural gas of about 960 BTU per SCF or more.
Abstract:
SIMULTANEOUS PRODUCTION OF HIGH QUALITY MOTOR AND JET FUELS IS ACCOMPLISHED BY PASSING A HYDROCARBON FEED THROUGH A HYDROTREATING ZONE, REMOVING MOTOR FUEL AND JET FUEL FROM THE EFFLUENT, PASSING A FRACTION BOILING ABOVE THE JET FUEL RANGE TO A HYDROCACKING ZONE, RECOVERING FROM THE HYDROCRACKING ZONE EFFLUENT A HIGH QUALITY MOTOR FUEL AND RECYCLING THE JET FUEL AND HEAVIER FRACTION TO THE HYDROTREATING ZONE.
Abstract:
Continuous process for the production of a gaseous stream comprising about 50 to 97 mole % methane (dry basis) or higher from a sulfur containing hydrocarbonaceous fuel without polluting the environment. A gaseous stream comprising H2 and CO produced by the partial oxidation of a hydrocarbonaceous fuel is subjected to water gas shift reaction to produce a gaseous stream rich in H2 and CO2. Acid gases i.e. CO2 and H2S are separately removed leaving a hydrogen-rich gas stream. At least a portion of the CO2 previously recovered is recombined with the hydrogen-rich stream to produce a gaseous mixture having a mole ratio H2/CO2 of about 4 to 10. This gas mixture is subjected to conventional catalytic methanation to produce a fuel gas comprising in mole % (dry basis) H2 45 to 1, and CH4 50 to 99. By using the reaction of CO2 and H2 rather than the reaction of CO and H2, a reduction of about 25% in the very large heat release encountered with the methanation reaction may be achieved. Optionally, substantially pure methane may be produced by adding a second portion of CO2 to the aforesaid fuel gas to produce a gaseous mixture having a mole ratio H2/CO2 of about 4, subjecting said gas mixture to conventional catalytic methanation to produce CH4 and H2O, and separating H2O from the process gas stream to produce substantially pure methane. Thus, the normally vigorous exothermic methanation reaction may be controlled better by the stepwise addition of CO2 to react with the hydrogen in the process gas stream.
Abstract:
Continuous process for the production of a gaseous stream comprising at least 90 mole % of methane (dry basis) from a sulfur containing hydrocarbonaceous fuel without polluting the environment including the steps of: partial oxidation of the hydrocarbonaceous fuel with air; cooling, cleaning, and purifying the process gas stream to produce a stream of feed gas comprising CO, H2 and containing N2 in the range of about 30 to 60 mole % (dry basis); two separate catalytic methanation steps with an intervening water-gas shift reaction step; and finally separating CO2 and N2 from the process gas stream to produce said methane stream. The large amount of nitrogen diluent in the reacting gas during the methanation step helps to control the normally vigorous exothermic methanation reaction. The product gas has a heating value in the range of about 900-1000 BTU/SCF. It may be used as a substitute for natural gas or as a feedstock for organic chemical synthesis.
Abstract:
A two-stage hydrocracking process for the conversion of heavy hydrocarbon fractions containing at least 50 p.p.m. nitrogen into lighter products using in both stages a catalyst containing a hydrogenating component supported on a mixture of a modified crystalline zeolite and at least one amorphous inorganic oxide.