Catalytic Rich Gas

CRG [Catalytic Rich Gas] A process for making town gas and rich gas from light petroleum distillate (naphtha). The naphtha is reacted with steam over a nickel-alumina catalyst yielding a gas mixture rich in methane. Developed by British Gas and used in the United Kingdom in the 1960s, but abandoned there after the discovery of North Sea gas. In 1977,13 plants were operating in the United States. 

The Catalytic Rich Gas (CRG) technology from Kvaerner is an example of pre-reformer technology that can be licensed. This technology was developed by British Gas and was first used in 1964. In 2001 over 25 CRG pre-reformers were in operation. If desired, a pre-reduced CRG catalyst is available. ... 

Description Gas feedstock is compressed (if required), desulfurized (1) and sent to the optional saturator (2) where some process steam is generated. The saturator is used where maximum water recovery is important. Further process steam is added, and the mixture is preheated and sent to the pre-reformer (3), using the Catalytic-Rich-Gas process. Steam raised in the methanol converter is added, along with available C02, and the partially reformed mixture is preheated and sent to the reformer (4). High-grade heat in the reformed gas is recovered as high-pressure steam (5), boiler feedwater preheat, and for reboil heat in the distillation system (6). The high-pressure steam is used to drive the main compressors in the plant. 

CRG process (catalytic rich gas process) A catalytic process used to produce fuel gas ftom naphtha, which is a light petroleum distillate. The naphtha is reacted with steam over a nickel-based catalyst at a temperamre of up to 650 C and pressure of 70 bar to produce a gas mixmre that is rich in me ane. Other gases in the product include carbon dioxide, carbon monoxide, and trace amounts of hydrocarbons. The process was superseded in the UKbythe discovery of North Sea gas. 

TABLE 9.16. Catalytic Rich Gas (CRG) Reforming and Substitute Natural Gas (SNG). 

Two-level diffuser contactors, which involve application of ozone-rich gas to the lower chamber. Lower chamber off-gases are applied to the upper chamber. Offgas treatment from contactors is an important consideration. Methods employed for off-gas treatment include dilution, destruction via granular activated carbon, thermal or catalytic destruction, and recycling. 

MRG [Methane rich gas] A catalytic steam-reforming system, similar to the classic syngas reaction of steam with a hydrocarbon mixture, but yielding hydrogen, methane, and carbon monoxide in different proportions. The system is thermodynamically balanced,... 

Recatro A process for making gas from liquid fuels and other gaseous hydrocarbons by catalytic conversion into rich gas, followed by catalytic steam reforming. Developed by BASF and Lurgi. 

If there is an existing Claus process nearby, the SO2 rich gas could be combined with the H2S feed. If the ratio of H2S to SO2 is about 2 1, a minor adjustment could be made and the gas sent to the catalytic reactor. 

The catalytic aqueous phase reforming might prove useful for the generation of hydrogen-rich gas from carbohydrates extracted from renewable biomass and biomass waste streams. The biomass-derived hydrocarbons are suitable to hydrogen generation from biomass, as well as for the reforming. 

Cellulose and sawdust were gasified in supercritical water to produce hydrogen-rich gas, and Ru/C, Pd/C, CeO particles, nano-CeO and nano-(CeZr)v02 were selected as catalysts. The experimental results showed that the catalytic activities were Ru/C > Pd/C > nano-(CeZr)xOj > nano-CeOj > CeO particle in turn. The 10 wt.% cellulose or sawdust with CMC can be gasified almost completely with a Ru/C catalyst to produce 2-4 g hydrogen yield and 11-15 g potential hydrogen yield per 100 g feedstock at the condition of 773 K, 27 MPa, 20 min residence time in supercritical water (Hao et al., 2005). 

Rapagna, S., Eoscolo, RU. 1998. Catalytic gasification of biomass to produce hydrogen-rich gas. Int J Hydrogen Energy 23 551-557. 

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