Niter cake

Formula NaHS04 MW 120.06 forms a monohydrate, NaHS04 H20 Synonyms sodium hydrogen sulfate sodium acid sulfate niter cake... 

The nitric acid vapors are led from the retort through a series of condensers and finally into absorption towers in which the acid is dissolved in water. The by-product sodium hydrogen sulfate is known as niter cake. Although it would seem reasonable to expect that this material might be used in a second reaction to produce more nitric acid,... 

Ethyl Chloride T rich loroacetaldehyde 7681-38-1 Niter Cake... 

While it is theoretically possible to obtain 2 moles of nitric acid for each mole of sulfuric acid used, 900°C temperature required makes this stoichiometry impractical. However, the residual acid value of the niter cake could be used to make hydrochloric acid from salt (Eq. 11.34). 

Amount of Acid Used. This reaction requires the presence of small amounts of ferrous ion to act as a catalyst. Generally about 0.05-0.2 of an equivalent of acid is used. The acids usually employed in the reduction process are hydrochloric and sulfuric. It should be borne in mind that hydrochloric acid sometimes causes the formation of small amounts of chlorinated amines whereas sulfuric acid may rearrange the intermediate arylhydroxylamines to hydroxyarylamines and cause the formation of darker amines in lower yields, particularly in the case of solid amines. Where the danger of hydrolysis or contamination by such products exists, acetic or formic acid is employed instead. The disadvantages in the use of sulfuric acid appear to be minimized when the sulfuric acid is introduced as sodium acid sulfate (niter cake). When used alone or preferably in conjunction with a calculated quantity of sodium chloride, a very economical and satisfactory promoter is obtained. For example, 2.4 lb of sodium chloride with 6 lb of niter cake per 100 lb of nitro compound gives satisfactory results. The niter cake is first ground and is added, along with the sodium chloride, to the water and finely divided iron in the reducer. 

Nickel cyanide Nickel nitrate Nickel salts Nicotine Nicotine sulfate Niter cake... 

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