Sulfor dioxide

Schuck, E. A., and G. J. Doyle. Photooxidation of Hydrocarbons in Mixtures Containing Oxides of Nitrogen and Sulfor Dioxide. Report No. 29. San Marino, Calif. Air Pollution Foundation, 1959. 126 pp. 

One of the chief difficulties with the solvent system concept is that in the absence of data, one is tempted to push it further than can be justified. For example, the reaction of thionyl halides with sulfites in liquid sulfor dioxide might be supposed to occur as follows, assuming that autoionization occurs ... 

The basis on which the TLV s are set may differ from substance to substance. For some, such as levels for silica dust, a guiding factor is protection against impaimient of health. For others, it is the comfort level of the individual, such as freedom from irritation, nuisance, or other forms of stress for example, the TLV for sulfor dioxide is based on irritation and not on toxicity per se. The TLV list is reviewed annually resulting in some revisions in values and. some additions to the list. 

Operating data for four absorption systems of plants utilizing the Cominco process are presented in TaUe 7-25. Obsraved sulfor dioxide removal efficiencies vary fonn 8S to 97%. The degree of sulfur dioxide removal attainable in a system of this type is obviously d en-doit upon a large nuniba of variables. Chief among these are... 

Hre rich solution is stripped of sulfor dioxide and hydrocarbons as it flows downward in the stripping column countercurrent to vapor (primarily water vapor) generated in the reboiler, which is heated by low pressure steam. 

The reaction of sulfor tnoxide and benzene in an inert solvent is very fast at low temperatures. Yields of 90% benzene sulfonic acid can be expected. Increased yields of about 95% can be realized when the solvent is sulfur dioxide. 

FIra extremely flemmable. keep away from open flame and sparks, no smoking avoid contoct with oxidants, sulforic acid and nitric add. powder. AFFF, foam, caibon dioxide, (halons). 

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