The thermal decomposition of solid state complexes of some rare earths (lanthanons) with bis-(2-ethylhexyl) phosphoric acid

1994 ◽  
Vol 243 (1) ◽  
pp. 27-34 ◽  
Author(s):  
M.M. Milanova ◽  
D.S. Todorovsky
Keyword(s):  
Thermal Decomposition ◽  
Solid State ◽  
Phosphoric Acid ◽  
Rare Earths

N-Methylcarbamoylphosphate, II. Thermische Zersetzung/ N-Methylcarbamoyl Phosphates, II. Thermal Decomposition

1984 ◽  
Vol 39 (8) ◽  
pp. 1095-1099
Author(s):  
Fritz Seel ◽  
Norbert Klein
Keyword(s):  
Thermal Decomposition ◽  
Solid State ◽  
Phosphoric Acid ◽  
Intermediate Product ◽  
Methyl Isocyanate ◽  
Hydrogen Phosphate ◽  
Aqueous Suspensions ◽  
Protic Solvents ◽  
Acid Esters

AbstractThe thermal decomposition of various salts of mono-N-methylcarbamoyl and bis-N-methylcarbamoyl phosphoric acid in aprotic and protic solvents (acetonitrile, trichlorom ethane, alcohols) and in the solid state has been studied in detail. Final products are mono-, di-, poly-, and cyclophosphates, in addition phosphoric acid esters if alcohols are used as solvents; and either sym. dimethylurea or methyl isocyanate and methylamine. The spontaneous decomposition of sparingly soluble N-methyl carbamoyl phosphates in aqueous suspensions to yield slightly soluble diphosphates demonstrates clearly that the reaction of calcium hydrogen phosphate with alkali cyanates via calcium carbam oylphosphate to give calcium diphosphate - which has been considered a prebiotic key reaction - is not a result of a special feature of the structure of the intermediate product.

Application of Calculus Equation in Solving Thermal Decomposition Kinetics Parameters of Flame Retardant Wood

2014 ◽  
Vol 983 ◽  
pp. 190-193
Author(s):  
Cai Yun Sun ◽  
Yong Li Yang ◽  
Ming Gao
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Thermal Degradation ◽  
Phosphoric Acid ◽  
Flame Retardant ◽  
Kinetic Parameters ◽  
Flame Retardancy ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Kinetics Parameters

Wood has been treated with amino resins and amino resins modified with phosphoric acid to impart flame retardancy. The thermal degradation of samples has been studied by thermogravimetry (TG) in air. From the resulting data, kinetic parameters for different stages of thermal degradation are obtained following the method of Broido. For the decomposition of wood and flame retardant wood, the activation energy is found to decrease from 122 to 72 kJmol-1.

scholarly journals STUDY OF THERMAL DECOMPOSITION PRODUCTS OF NITROGEN-PHOSPHORUS-POTASSIUM FERTILIZERS BASED ON AMMONIUM NITRATE BY X-RAY DIFFRACTUON

2017 ◽  
Vol 61 (1) ◽  
pp. 72
Author(s):  
Konstantin G. Gorbovskiy ◽  
Alena S. Ryzhova ◽  
Andrey M. Norov ◽  
Denis A. Pagaleshkin ◽  
Valentina N. Kalinina ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Phosphoric Acid ◽  
Ammonium Nitrate ◽  
Confined Space ◽  
Decomposition Products ◽  
X Ray ◽  
Thermal Decomposition Products ◽  
Nitrogen Phosphorus ◽  
Thermal Stability Of

Complex mineral ammonium nitrate-based fertilizers are complex multicomponent salt systems possessing low thermal stability and prone to self-sustaining decomposition. This leads to the need to increase the requirements for fire and explosion safety in their manufacture, storage and transportation, caused by the fact that ammonium nitrate is a solid oxidant able to support a combustion, and its heating in confined space can lead to detonation. Components that make up such fertilizers can both reduce (phosphates and ammonium sulfate) and accelerate (chlorine compounds) decomposition of ammonium nitrate. Thus, the thermal stability of fertilizers based on ammonium nitrate largely depends on the ratio of the components that make up its composition or formed as a result of the chemical reaction. The simplest way to reduce the content of ammonium nitrate and increase the thermal stability of fertilizer without changing the content of essential nutrients is to increase the degree of phosphoric acid ammoniation. In this paper, the phase composition change of grade 22:11:11 nitrogen-phosphorus-potassium fertilizer obtained with different ammoniation degree in the process of thermal decomposition was studied by X-ray phase analysis. To obtain this fertilizer, wet-process phosphoric acid obtained sulfuric acid attack of the Khibin apatite concentrate by a hemihydrate method is used. It is shown that an increase in the ammoniation degree has a significant effect on the exothermic decomposition of ammonium nitrate and the amount of material that is released into the gas phase. The phases formed at each stage of the decomposition are determined.Forcitation:Gorbovskiy K.G., Ryzhova A.S., Norov A.M., Pagaleshkin D.A., Kalinina V.N., Mikhaylichenko A.I. Study of thermal decomposition products of nitrogen-phosphorus-potassium fertilizers based on ammonium nitrate by X-ray diffractuon. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 1. P. 72-77

From Coordination Complexes to Potential Heterogeneous Catalysts via Solid‐State Thermal Decomposition: Precursor, Atmosphere and Temperature as Tuning Variables

2019 ◽  
Vol 4 (28) ◽  
pp. 8365-8371
Author(s):  
José Pérez ◽  
José L. Serrano ◽  
Gregorio Sánchez ◽  
Pedro Lozano ◽  
Ivan da Silva ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Solid State ◽  
Heterogeneous Catalysts ◽  
Coordination Complexes

Solid-state transformations by thermal decomposition of [Co(en)3][Fe(C2O4)3] in an inert atmosphere

2020 ◽  
Vol 687 ◽  
pp. 178578
Author(s):  
D.P. Dоmоnоv ◽  
S.I. Pechenyuk ◽  
Yu.P. Semushina ◽  
G.I. Kadyrova
Keyword(s):  
Thermal Decomposition ◽  
Solid State ◽  
Inert Atmosphere
Sign in / Sign up

Export Citation Format

Share Document