Embodiments of the disclosure provide a method and system for sulfur recovery. A Claus tail gas stream is fed to a hydrogenation reactor to produce a hydrogenated gas stream. The hydrogenated gas stream is fed to a quench tower to produce a quenched gas stream. The quenched gas stream is fed to a first stage adsorption vessel of first stage adsorption unit to produce a first outlet gas stream. The first outlet gas stream is fed to a second stage adsorption vessel of a second stage adsorption unit to produce a second byproduct gas stream. The first stage adsorption vessel is regenerated to produce a first byproduct gas stream. The second stage adsorption vessel is regenerated to produce a second outlet gas stream including hydrogen sulfide. Optionally, a portion of the second byproduct gas stream or nitrogen can be fed to the first stage adsorption vessel or the second stage adsorption vessel for regeneration. Optionally, a sales gas can be fed to the second stage adsorption vessel for regeneration. Optionally, vacuum can be applied to the first stage adsorption vessel or the second stage adsorption vessel for regeneration.

A thermal diffusion unit is fluidly connected to a combustion engine via a flue line. The thermal diffusion unit has a plurality of plates assembled in a parallel configuration, including a pair of heating plates having a heating fluid gap extending therebetween and a pair of cooling plates having a cooling fluid gap extending therebetween. A diffusion sheet is positioned between the pair of heating plates and the pair of cooling plates, such that the diffusion sheet interfaces on a first side with one of the heating plates and interfaces on an opposite side with one of the cooling plates. The diffusion sheet includes a plurality of interconnected thermal diffusion cells arranged in a repeating pattern, at least one heated passage fluidly connecting adjacent thermal diffusion cells, and at least one cooled passage fluidly connecting adjacent thermal diffusion cells.

Embodiments of the disclosure provide a method and system for sulfur recovery. A Claus tail gas stream is fed to a hydrogenation reactor to produce a hydrogenated gas stream. The hydrogenated gas stream is fed to a quench tower to produce a quenched gas stream. The quenched gas stream is fed to a first stage adsorption vessel of first stage adsorption unit to produce a first outlet gas stream. The first outlet gas stream is fed to a second stage adsorption vessel of a second stage adsorption unit to produce a second byproduct gas stream. The first stage adsorption vessel is regenerated to produce a first byproduct gas stream. The second stage adsorption vessel is regenerated to produce a second outlet gas stream including hydrogen sulfide. Optionally, a portion of the second byproduct gas stream or nitrogen can be fed to the first stage adsorption vessel or the second stage adsorption vessel for regeneration. Optionally, a sales gas can be fed to the second stage adsorption vessel for regeneration. Optionally, vacuum can be applied to the first stage adsorption vessel or the second stage adsorption vessel for regeneration.

A dehumidification system includes a desiccant, a primary heat exchanger, a secondary heat exchanger, three fans, and a burner. The first fan generates a carbon dioxide airflow through the primary heat exchanger and the secondary heat exchanger. The burner generates a flame into one end of the primary heat exchanger. The flame increases an amount of carbon dioxide within the carbon dioxide airflow. The second fan generates a reactivation airflow that flows over a portion of the secondary heat exchanger, a portion of the primary heat exchanger, and then through a first portion of the desiccant in order to dry the desiccant. The third fan generates a process airflow that flows through a second portion of the desiccant in order to provide dehumidification to the process airflow.

The present invention provides a method and apparatus for removing mercury from gases such as those discharged from roasters and other heat producing systems. In embodiments the method comprises reacting the mercury with dissolved molecular chlorine, and may also comprise reacting the mercury with mercuric chloride to yield mercurous chloride. The mercurous chloride may be removed by precipitation. There are also disclosed apparatuses for implementing the method.

A dehumidification system includes a desiccant, a primary heat exchanger, a secondary heat exchanger, three fans, and a burner. The first fan generates a carbon dioxide airflow through the primary heat exchanger and the secondary heat exchanger. The burner generates a flame into one end of the primary heat exchanger. The flame increases an amount of carbon dioxide within the carbon dioxide airflow. The second fan generates a reactivation airflow that flows over a portion of the secondary heat exchanger, a portion of the primary heat exchanger, and then through a first portion of the desiccant in order to dry the desiccant. The third fan generates a process airflow that flows through a second portion of the desiccant in order to provide dehumidification to the process airflow.

Disclosed is a method of providing oxygen rich gas. Oxygen is separated from ambient air with an oxygen separator in discrete pulses, one pulse at a time. The start of the pulse is synchronized with the beginning of an inhalation of a person. The oxygen rich gas in each pulse is separated from the ambient air in real time during a nitrogen adsorption step concurrent with each inhalation.

A decomposer for an organohalogen compound, containing iron particles comprising iron and iron oxide, wherein the iron particles have a metallic iron content of 15% or more by mass, wherein the metallic iron content is a content of metallic iron in the outermost surface layer of the iron particles to which the ion beam etching has been applied twice under the following etching conditions: degree of vacuum in a chamber: 2.010.sup.2 Pa accelerating voltage of an ion gun: 10 kV emission current: 10 mA etching time: 14 seconds.
The decomposer need not contain copper and has the ability to satisfactorily decompose an organohalogen compound. A method for producing the decomposer is also provided.

Compositions for reduction of NO.sub.x generated during a catalytic cracking process, preferably, a fluid catalytic cracking process, are disclosed. The compositions comprise a fluid catalytic cracking catalyst composition, preferably containing a Y-type zeolite, and a particulate NO.sub.x reduction composition containing ferrierite zeolite particles. Preferably, the NO.sub.x reduction composition contains ferrierite zeolite particles bound with an inorganic binder. In the alternative, the ferrierite zeolite particles are incorporated into the cracking catalyst as an integral component of the catalyst. NO.sub.x reduction compositions in accordance with the invention are very effective for the reduction of NO.sub.x emissions released from the regenerator of a fluid catalytic cracking unit operating under FCC process conditions without a substantial change in conversion or yield of cracked products. Processes for the use of the compositions are also disclosed.

A system includes a biochar sorbent system having a biochar sorbent chamber configured to support a biochar, and an exhaust path configured to flow an exhaust gas through the biochar sorbent chamber, wherein the biochar sorbent system is configured to adsorb an undesirable gas from the exhaust gas into the biochar to generate an enriched biochar and a treated gas.