Tetrahydrothiophene 1,1-dioxide

The Sulfinol process from Shell Development Company is a good example of the physical/chemical type of process. It blends a physical solvent and an amine to obtain the advantages of both. The physical solvent is Sulfolane (tetrahydrothiophene dioxide) and the amine is usually DIPA (diisopropanol amine). The flow scheme is the same as for an amine plant. ... 

The Shell Sulfinol Process is used for removal of acidic constituents such as H2S, CO2, COS, etc. from a gas stream. Improved performance over other processes is due to the use of an organic solvent, Sulfolane (tetrahydrothiophene dioxide), mixed with an aqueous alkanolamine. Relative proportions of Sulfolane, alkanolamine, and water, as well as the operating conditions, are tailored for each specific application. Simultaneous physical and chemical absorption under feed gas conditions is provided by this Sulfinol solvent. Regeneration is accomplished by release of the acidic constituents at near atmospheric pressure and a somewhat elevated temperature. The flow scheme (Figure 4) is very similar to that of an aqueous alkanolamine system since it involves only absorption, regeneration and heat exchange under typical alkanolamine treater conditions. 

Mixture of aqueous amine (e.g., DIPA) Sulfolane (tetrahydrothiophene dioxide)... 

The salt is prepared efficiently by reaction of trimethylamine with methylene iodide in dioxane-ethanol. The product (1) is then heated at about 150° for about 12 min. in tetrahydrothiophene dioxide dimethyl(methylene)ammonium iodide (2) is obtained in 81 % yield.1... 

The mixed solvent of Sulfinol process consists of a chemical reacting al-kanolamine, water and the physical solvent Sulfolane (tetrahydrothiophene dioxide). The actual formulation is customized for the species of application. The process flow scheme is similar to that of other amine processes. In most applications co-absorbed hydrocarbons from the absorber are flashed from the solvent and used as fuel gas after treating in a fuel gas absorber. The solvent is regenerated in the process. Over 180 units are either in operation or under construction as of April 1994 [38]. 

Colorless crystals from tetrahydrothiophene dioxide, dec -240 . Sublimes at 120 at 0.05 torr. 

Dihydrubutadiene sulfone Dihydrobutadiene sulphone Dioxothiolan EINECS 204-7861 HSDB 122 NSC 46443 Sulfalone Sulfolan Sulfolane Sulpholane Sulphoxaline Tetrahydrothiofen-1,1-dioxid Tetrahydrothiophene dioxide Tetrahydro-thiophene 1,1-dioxide Tetramethylene sulfone Thia-cyclopentane dioxide Thiocyclopentane-1,1-dioxide Thiolane-1,1-dioxide Thiophan sulfone Thiophane dioxide Thiophene, tetrahydno-, 1,1-dioxide. Solid mp = 27,6° bp = 287.3° d = 1,2723 soluble in CH03. 

CAS 126-33-0 EINECS/ELINCS 204-783-1 Synonyms Cyclic tetramethylene sulfone Cyclotetramethylene sulfone Dapsone Dihydrobutadiene sulfone 1,1 -Dioxide tetrahydrothiofuran 1,1-Dioxidetetrahydrolhiophene Dioxothiolan 1,1-Dioxothiolan Sulfalone Sulfolan Tetrahydrothiophene dioxide Tetrahydrothiophene-1,1 -dioxide 2,3,4,5-Telrahydrothiophene-1,1 -dioxide Tetramethylene sulfone Thiacyclopentane dioxide Thiocyclopentane-1,1-dioxide Thiolane-1,1 -dioxide Thiophane dioxide Thiophan sulfone Empirical C4H8O2S Formula CH2CH2CH2CH2SO2... 

Tetrahydrothiophene dioxide Tetrahydrothiophene-1,1-dioxide 2,3,4,5-Tetrahydrothiophene-1,1-dioxide. See Sulfolane... 

The Sulfinol solvent consists of sulfolane (tetrahydrothiophene dioxide) and an alkanolamine, usually diisopropanolamine (DIPA) or methyldiethanolamine (MDEA), and water. The solvent with DIPA is referred to as Sulfinol-D or simply as Sulfinol, and the solvent with MDEA is referred to as Sulfinol-M. Typically, Sulfinol-D is used when essentially complete removal of both hydrogen sulfide and carbon dioxide and deep removal of carbonyl sulfide is desired. Sulllnol-M is used for the selective removal of hydrogen sulfide over carbon dioxide and the partial removal of carbonyl sulfide (Nasir, 1990). Both Sulfinol solvents are reported to be capable of removing mercaptans and alkyl sulfides to very low levels. 

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