pound.
Ingredient in Gas Odorants
an odorant in natural gas where it serves as a back up to mercaptan compounds. It is chemically
and thermally stable and does not diminish in odor characteristics when exposed to black iron pipe
and tanks. The physical properties of DMS make it easy to handle through common odorizing equip-
ment. It boils at 37° C and is volatile enough at the concentrations required that it will not condense
in transmission and distribution systems under normal operating temperatures and pressures. Di-
methyl sulfide will not fractionate from liquid petroleum gas cylinders nor will it react with compressor
oil to form gums, resins, and compounds with low odorizing values.
Fuel Additive
tors. The use of DMS prevents exhaust nozzle fouling and carbon deposition on the firing chamber
surfaces.
Control of Coke Formation
monoxide. DMS may be utilized in steel mill furnaces to control dusting.
STORAGE AND HANDLING
Dimethyl sulfide is a highly flammable liquid with a flash point of -34°C and an auto-ignition tempera-
ture of 206°C. As a general rule, the same precautions should be employed in the handling of DMS
as are used with diethyl ether. See Bulletin 202B - DMS Bulk Trailer Unloading for more detailed
instructions on handling that specific packaging option.
As with any highly flammable material, DMS should be stored in tightly closed containers, in a cool
place, and away from strong oxidizing agents or open flames. If operations are to be conducted in
closed spaces, explosion-proof electrical switches and motors are suggested, such as will meet
specifications of Class 1, Group C, Division 1 of the National Electrical Code. It is also suggested
that consideration be given to maintaining an inert atmosphere in the head space when loading or
unloading storage tanks or drums.
Drums must be grounded before the DMS can be transferred. Suitable methods include gravity
flow or pressure unloading with an inert gas. For gravity unloading, piping may be of mild steel or
even polyethylene tubing, again being sure that the drum and storage tank are properly grounded
and electrically interconnected. With this method of unloading, air venting the drum should be satis-
factory. In the event of pressure unloading, in no instance should air or oxygen be used for pressur-
izing. In current operations, nitrogen has proven very satisfactory for this type of handling.
Storage tanks must be suitable for flammable liquids and may be mild or stainless steel, or alumi-
num. Nozzles should be flanged and located on top of the tank or vessel whenever possible. Do not