Acid gas treatment

Combustion Many organic compounds released from manufacturing operations can be converted to innocuous carbon dioxide and water by rapid oxidation (chemical reaction) combustion. However, combustion of gases containing halides may require the addition of acid gas treatment to the combustor exhaust. 

Traditionally, acid gas treatment has required two separate processes. One is to remove hydrogen sulfide and the other is to convert the concentrated hydrogen sulfide stream to sulfur. A new process called the SulFerox process, developed by Shell Oil Company and The Dow Chemical Company, now offers a single process that handles both steps. The process has high degree of flexibility and requires a smaller capital investment than the Amine/Claus process. Chelated iron compounds are the heart of the process and the chemistry allows an aqueous solution of iron in high concentrations. As a result, circulation rates are low and equipment size is very small for the capacity. Figure 5.1 shows a schematic of the SulFerox process [76]. 

The Stretford process for acid gas treatment allows for direct recovery of sulfur without going through a Claus reaction, that is,... 

The bed is fluidized by a mixture of steam and recycled carbon monoxide-hydrogen. Unreacted steam is condensed and the acid gases (CO2, H2S) are removed by conventional acid gas treatment. The product (methane) is separated from the carbon monoxide and hydrogen by a cryogenic process. The solid product (which is actually a mixture of char, coal minerals, and the catalyst) is removed on a continuous basis the majority of the catalyst is recovered and recycled. 

Formula C3H702(0CHCH3CH2)x(0CH2CH2)y0H, avg. X = 66, avg. y = 12 Properties Nonionic Toxicology TSCA listed Uses Emulsifier, solvent in cosmetics defoamer for cutting and drilling fluids, fermentation, chem. mfg., acid gas treatment, pulp and paper, and textiles Features Provides low odor, low irritation, low toxicity to personal care prods Manuf./Distrib. Aldrich http //www.sigma-aldrich.com... 

This chapter covers multi-step work of tailoring C02-selective membrane material, from new copolymers designs to tailor-made copolymer/PEG blends, moreover thin film composite membrane performance are also discussed. The relationships between gas transport properties, structure, morphology and physical properties are analyzed. The performance at different operating conditions and with mixed gases is monitored as well in order to have a guideUne for scaling up the membranes. The benefits of these membranes are the simplicity of preparation, low cost and resistance toward acid gas treatment. 

Chemical and physical solvents are the most commonly used absorption processes for acid gas treatment... 

Chemical and physical solvents are the most commonly used absorption processes for acid gas treatment. In the chemical process, mono- and diethanolamine are used to react with the acid gases reversibly and form products that can be generated by a change in temperature as given in Figure 7.16 The physical process, on the other hand, uses a solvent to absorb the sour gases (Sulfinol process) from the natural gas. The absorbed impurities are then separated from the rich solvent by steam stripping. 

Hardison, L. C., 1990, Recent Developments in Acid Gas Treatment Using the Autocirculation LO-CAT Approach, paper presented at the AIChE Spring National Meeting. Houston, TX. April 7-11. 

Uses Surfactant for fermentation, oil drilling, mining, chem. mfg., acid gas treatment, pulp and paper, and textiles... 

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