I would like to ask about the principle of reforming catalyst regeneration and the issue of non-methane total hydrocarbons in the regeneration flue gas
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This post was last edited by leejones on 2017-8-1 15:22. The new \"Emission Standards for Pollutants in the Petroleum Refining Industry\" (GB31570-2015) set limits for pollutant emissions in the refining sector. Among these, the requirements for the flue gas from catalytic cracking catalyst regeneration are that particulate matter shall not exceed 50, nickel shall not exceed 0.5, sulfur dioxide shall not exceed 100, and nitrogen oxides shall not exceed 200; no specifications are set for other pollutants ； The requirements for the flue gas from catalytic reforming catalyst regeneration are that hydrogen chloride levels must not exceed 30, and total non-methane hydrocarbons must not exceed 60; no specifications are set for other pollutants. It is clear that the requirements for the two are significantly different. The flue gases generated during the regeneration of catalytic cracking catalysts are somewhat easier to understand, as the regeneration process mainly involves combustion; therefore, the standards only specify these combustion products. What is the general principle behind the regeneration process of reforming catalysts? Why are there hydrocarbons in the regenerated flue gas? Does the regeneration process of reforming catalysts not involve combustion?
The regeneration of reforming catalysts generally involves coking, oxychlorination, drying, and reduction; overall, the degree of coking is lower than that in catalytic cracking.
The regeneration of the reforming catalyst takes place in two steps: 1. Burning off the carbon and hydrogen on the surface of the catalyst； 2. Re-reduce the metal on the catalyst surface. Because of the presence of chlorine, it is necessary to control it; since combustion occurs in a cyclic manner, the hydrocarbons present cannot be completely burned off.
Thank you. I also have a question: are there benzene compounds in the regenerated flue gas? Theoretically, which might be more abundant, benzene derivatives or hydrocarbons?
Thank you. I also have a question: are there benzene compounds in the regenerated flue gas? Theoretically, which might be more abundant, benzene derivatives or hydrocarbons?
Some studies say dioxins are produced; I’m not too familiar with the details.
It’s more oxidation than burning