- Analysis of the CO2 and NH3 reaction in an aqueous solution by 2D IR COS: Formation of bicarbonate and carbamate
-
The two-dimensional (2D) infrared correlation spectra obtained from the reaction time- and concentrationdependent IR spectra elucidates the reaction of CO2 and NH3 in an aqueous solution for CO2 absorption. In the synchron
- Park, HoSeok,Jung, Young Mee,You, Jong Kyun,Hong, Won Hi,Kim, Jong-Nam
-
p. 6558 - 6562
(2009/04/13)
-
- NH4CaCl3, the Reactive Intermediate Phase in a Synthesis of CaCl2
-
The reaction of CaCO3 with NH4Cl leads to formation of CaCl2. In this reaction an intermediate phase is formed, that is be characterized as NH4CaCl3. This intermediate phase crystallizes in the GdFeO3 type and decomposes at elevated temperatures to yield CaCl2 and NH4Cl. The fomation andthe decomposition of this intermediate phase as well as the formation o f CaCl2 were studied with X-ray and thermoanalyical methods.
- Naegele, Andreas,Gibson, Katharina,Glaser, Jochen,Meyer, H.-Juergen
-
-
- Process for preparing thiourea dioxide
-
According to this invention there is provided a process for preparing thiourea dioxide characterized in that in the production of thiourea dioxide by the reaction of thiourea and hydrogen peroxide in an aqueous solvent, ammonium bicarbonate is added to the reaction solution at a proper time.
- -
-
-
- Imidazoles and 2-alkyl imidazoles and method for their manufacture
-
The method is for manufacturing imidazoles corresponding to the general formula: STR1 in which R represents hydrogen or an alkyl radical of 1 to 17 carbon atoms. Glyoxal is condensed with an aliphatic aldehyde and ammonia, in a hydroalcoholic medium at a pH comprised between 6 and 8. The glyoxal is in the form of its bisulfite combination and the ammonia being supplied by an ammonium salt of a weak acid.
- -
-
-
- PROLINE DERIVATIVES AND RELATED COMPOUNDS
-
New proline derivatives and related compounds which have the general formula STR1 are useful as angiotensin converting enzyme inhibitors.
- -
-
-
- KINETICS OF UREA DECOMPOSITION IN PRESENCE OF MONOAMMONIUM PHOSPHATE AT ELEVATED TEMPERATURS
-
Manufacture of mixed nitrogen-phosphorus or nitrogen- phosphorus- potassium fertilizers, with the use of urea, its aqueous solutions or melts, or the urea-containing melt formed as an intermediate product in the synthesis of urea, is of great industrial interest. The authors investigated decomposition of urea in presence of monoammonium phosphate, in relation to manufacture of a nitrogen- phosphorus fertilizer by treatment of urea-containing melts with orthophosphoric acid at 100 to 150 C. Decomposition ofrea in this system is described by a kinetic equation of the second order. Equations are given for calculating the degree of decomposition of urea as a function of the time after mixing of the urea solution with monoammonium phosphate and for finding the time required for complete conversion of monoammonium phosphate into diammonium phosphate at different temperatures. It is suggested that the decomposition of urea in the system studied may proceed by direct formation of ammonium carbonates, without the intermediate stage of isomerization to ammonium cyanate.
- SARBAEV AN,TIMOSHENKO LS
-
-
