Amidosulfuric Acid Research Articles

Pyrolytic Sulfurization Gas Chromatography. II. Simple Determination of the Correction Factors Using Five Standard Compounds

Abstract An improvement has been made in the pyrolytic sulfurization gas chromatographic method, by which the atomic ratio between C, H, O, and N in a sample can be simultaneously determined. Analysis was carried out by use of the correction factors instead of calibration curves. Correction factors were obtained by use of five standard compounds, naphthalene, thiourea, cyanoguanidine, sucrose, and amidosulfuric acid. The method is simple, accurate, and applicable to various compounds.

Formation of Ammonium Sulfate in the Production of Ammonium Amidosulfate by the Ammonolysis of Ammonium lmidobissulfate at Elevated Temperature and under Ammonia Pressure

Formation of ammonium sulfate in the production of ammonium amidosulfate by the reaction of (NH4SO3)2NH + NH3 - 2NH4SO3NH2 has been investigated over the range of 200-310 C and 2-30 kg/cm2 ammonia pressure.Ammonium sulfate formed in the ammonolytic reaction was confirmed by X-ray diffraction, paper chromatography, and chemical analysis. The amount of ammonium suifate increases as the temperature and ammonia pressure are increased. Especially, it increases greatly above 250 C under 30kg/cm2 ammonia pressure, and at about 3000C under the same pressure, the chief product of the reaction is ammonium sulfate. A small amount of sulfur is also produced in the reaction, and this sulfur increases with increasing ammonium sulfate.The mechanisum of the formation of ammonium sulfate is considered that the presence of ammonia promotes the dehydration of ammonium amidosulfate and ammonium imidobissulfate, and the yielded water reacts with above residual two substances to form ammonium sulfate. The overall reaction is given as the following equation.Lower pressure reaction, at 230-280 C and under 2-5kg/cm2 ammonia pressure, was also investigated in connection with the production of amidosulfuric acid and ammonium amidosulfate.