Nitrogen mining

A class of nitrogen containing compounds that was omitted from the section just dis cussed includes mines and their derivatives Immes are formed by the reaction of aide hydes and ketones with ammonia Immes can be reduced to primary amines by catalytic hydrogenation... 

PoIya.mines are condensation polymers containing nitrogen they are made by a variety of synthetic routes. Most of the commercial polyamines are made by reaction of epichlorohydrin with amines such as methylamine [25988-97-0] or dimethylamine [39660-17-8] (18,19). Branching can be increased by a dding small amounts of diamines such as ethylenediamine [42751-79-1]. A typical stmcture of this type of polyamine is stmcture (9). 

Patty amines and chemical products derived from the amines are used in many industries. Uses for the nitrogen derivatives may be broken down as follows as a percentage of total market fabric softeners (46%), oil field chemicals (15%), asphalt emulsifiers (10%), petroleum additives (10%), mining (4%), and others (15%) (8). 

Helium and Natural-Gas Systems Separation Helium is produced primarily by separation of hehum-rich natural gas. The hemim content of the natural gas from plants operated by the U.S. Bureau of Mines normally has varied from 1 to 2 percent while the nitrogen content of the natural gas has varied from 12 to 80 percent. The remainder of the natural gas is methane, ethane, and heavier hydrocarbons. 

Jones, G. W. and Kennedy, R. E.. Limits of Inflammability of Natural Gases Containing High Percentages of Carbon Dioxide and Nitrogen, Bureau of Mines Report of Investigation, 3216, 1933. 

Figure 7-50. Effects of pressure on limits of flammability of ethane-nitrogen-air mixture at 26°C. By permission, U.S. Bureau of Mines, Bulletin 627 [43],...

J.A. Herickes J. Ribovich, Study of Military Applications of Nitrogen Tetroxide Explosives , Summary Report No 3746, Bur-Mines, NSDl (1956) 15) P. Gray, The... 

The element phosphorus, like nitrogen, is essential to plant and animal life. Although phosphorus was not identified and isolated until 1669, phosphorus-containing materials have been used as fertilizers since ancient times, usually from bird droppings, fish, and bone. The first phosphoric acid was made by treating bone ashes with sulfuric acid. This marked the beginning of the commercial fertilizer industry. Eventually, mined phosphate rock, a poor fertilizer by itself, was substituted for bones as a raw material for phosphoric acid in the mid-1880s. 

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