Methylacetylene-propadiene

Earlier workers have identified some of the products of 1-butene pyrolysis (3,4). In this work, several previously unreported products were found along with many of those previously noted. Acetylene was observed among the products from 1-butene as well as 2-butene in yields that paralleled the formation of ethylene. Yields varied from a trace at low temperatures to between 5%-10% of the total C2 product at the highest temperatures. Methylacetylene + propadiene (MAP) yield varied in a similar manner for 1-butene pyrolysis ranging between 2% and 20% of the C3 product. In 2-butene pyrolysis, the MAP yield comprised approximately 10% of the C3 product in all of the runs. 

Methylacetylene also is used in welding torches. Methylacetylene does not decompose as easily as acetylene, and it burns better in air (as opposed to pure oxygen). Methylacetylene is well suited for household soldering and brazing that requires higher temperatures than propane torches can reach. The industrial synthesis of methylacetylene gives a mixture with its isomer, propadiene (allene). This mixture is sold commercially under the name MAPP gas (MethylAcetylene-ProPadiene). 

Synonyms MAPP Gas liquefied petroleum gas with methylacetylene-propadiene ... 

Flammability and Shock Sensitivity Characteristics of Methylacetylene, Propadiene and Propylene Mixtures, Explosives Research Laboratory, Bureau of Mines Report No. 3849, Cooperative Agreement with Dow Chemical Company 14-09-0050-2152, Bureau of Mines, Pittsburgh Research Center, Cochrans Mill Road, P.O. Box 18070, Pittsburgh, PA 15236-0070. Journal of Chemical Engineering Data, 9, no. 3, 467-472 (July 1964). American Chemical Society, 1155 16th Street NW, Washington, DC 20036. 

When soldered connections are needed, the brazing alloy should be flat stick silver solder containing 15% silver. Use MAPP (methylacetylene propadiene). 

Flammable gas containers stored inside of industrial buildings at consumer sites, except those in use or attached for use, must be limited to a total gas capacity of 2500 ft (70.8 m ) of acetylene or nonliquefied flammable gas, or a total water capacity of 735 lb (333 kg) for liquefied petroleum gas or stabilized methylacetylene-propadiene. [Note 735 lb (333 kg) water capacity is equivalent to approximately 309 lb (140 kg) of propane, 368 lb (167 kg) of stabilized methylacetylene-propadiene, or 375 lb (170 kg) of butane.]... 

Synonyms MAPP D Gas liquefied petroleum gas with methylacetylene-propadiene methylacetylene-propadiene mixture methylacetylene-propadiene stabilized CAS Registry Number none DOT Classification Flammable gas DOT Label Flammable gas Transport Canada Classification 2.1 UN Number UN 1075... 

Sodium Alkylbenzene-sulfonates Methylacetylene-Propadiene Mixture Fumaric Acid... 

Compound Name Methyl Acetate Propionic Acid Propionic Anhydride Methyl Mercaptan Dimethyl Sulfide Formic Acid Methyl Alcohol Hexamethylenetetramine Methoxychlor Methoxychlor Diethylebe Glycol Monomethyl Ether Methylacetylene-Propadiene Mixture Methylacetylene-Propadiene Mixture Crotonaldehyde Methyl Acrylate Methyl Formal Methyl Alcohol Methallyl Chloride Methylamine N-Methylaniline Methyl Amyl Acetate Methyl Amyl Alcohol Methyl Isobutyl Carbinol N-Amyl Methyl Ketone O-Toluidine 0-Toluidine N-Methylaniline N-Methylaniline Propyleneiniiine. 

Since carbon can only form a total of four bonds, it is possible for a carbon atom to contain one triple bond and one single bond hydrocarbons containing a triple bond are termed alkynes. Alkynes are named in parallel to the alkanes and alkenes, as described previously, and can also be branched and linear. Propyne, also known as methylacetylene, has the condensed formula CHjC CH and is a component of MAPP gas, a tradename of the Petromont, previously of the Dow Chemical Company. MAPP stands for methylacetylene-propadiene propane. Propyne is usually used in combination with oxygen for welding and is about two to four times more expensive than propane. 

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