Composition Of Decomposition Products Research Articles

Influence of technological process parameters on qualitative characteristics of coal thermolysis products

Purpose. To determine and compare the qualitative and quantitative characteristics of products obtained under different coking conditions to streamline the process and consider the deeper use of recycled materials at Shubarkol Komir JSC. Methodology. Based on the existing coking technology on the basis of the enterprise, two variants of temperature exposure to coal were tested. The first option is heating coal to 900 C, which is carried out by slow thermolysis of coal in a stream of ascending gases. The second option is high-speed heating of coal to 900 C with further loading of the released products into the chamber for additional pyrolysis at 800 C, which is carried out with the development of reactions involving oxygen-containing gases from the furnace and from the outside. Findings. At the production site as well as under laboratory conditions, the composition and quality characteristics of the products of heat treatment of long-flame coal under various temperature effects were determined. Differences in the composition of decomposition products were noted and their quantitative yield was determined. Originality. Analytical data on coking products have been obtained and the dependences of their quantitative and physical parameters on different applications of thermolysis on the coals of the Shubarkol deposit have been established. Practical value. The results of the work allow improving the technology of coke production by introducing an additional stage of pyrolysis, which will lead to an improvement in the consumer properties of coke, and also create conditions for the development of methods for using secondary production products.

ChemInform Abstract: Thermosynthesis of Anhydrous Phosphates.

Abstract Thermosynthesis is a direct and, in the majority of cases, a shorter way of obtaining anhydrous phosphates. In the present paper oxides (carbonates) of multivalent metals and ammonium dihydrogen phosphate were used as initial components. However, the complicated and incessantly changing composition of decomposition products of ammonium dihydrogen phosphate in a wide temperature range virtually excludes the possibility to investigate the systems under equilibrium conditions (in some cases one can investigate only metastable state systems, in which the “equilibrium” is reached “from below”). With the aim, regardless of the above-mentioned, to retain the opportunity to summarize all basic chemical processes (leading reactions) of solid-phase interaction of the initial components we have made use of complex schemes of solid-phase reactions under dynamic (nonequilibrium) conditions with different phosphorus-metal ratios and temperature rate. It does not exclude application of state diagrams (in more n...

Thermal Decomposition Behavior of Heteronuclear Complexes, Ln[Co(CN)<sub>6</sub>]⋅<i>n</i>H<sub>2</sub>O (Ln=La-Yb)

The thermal decomposition behavior of Ln-Co (1:1) cyano complexes and the composition of decomposition products have been examined. Decomposition of their CN-bridged structures proceeded on heating at about 300°C in air, generating amorphous phases containing carbonate complexes. For the complexes comprising La-Nd, submicron sized particles of perovskite-type oxide were formed (without single phase oxides Co3O4 and Ln2O3) from an amorphous phase by heating at about 620°C. For the complexes comprising Eu, Gd and Dy, a mixture of single oxides (Co3O4 and Ln2O3) and perovskite-type oxide was formed. The content of the perovskite-type oxide increased with the increase in decomposition temperature. For the complexes containing Ho and Yb the corresponding perovskite-type oxide could not be obtained even when the complex was decomposed at 1100°C.

Thermosynthesis of Anhydrous Phosphates

Abstract Thermosynthesis is a direct and, in the majority of cases, a shorter way of obtaining anhydrous phosphates. In the present paper oxides (carbonates) of multivalent metals and ammonium dihydrogen phosphate were used as initial components. However, the complicated and incessantly changing composition of decomposition products of ammonium dihydrogen phosphate in a wide temperature range virtually excludes the possibility to investigate the systems under equilibrium conditions (in some cases one can investigate only metastable state systems, in which the “equilibrium” is reached “from below”). With the aim, regardless of the above-mentioned, to retain the opportunity to summarize all basic chemical processes (leading reactions) of solid-phase interaction of the initial components we have made use of complex schemes of solid-phase reactions under dynamic (nonequilibrium) conditions with different phosphorus-metal ratios and temperature rate. It does not exclude application of state diagrams (in more n...

Modification in thermal decomposition products of polymers by catalytic pyrolysis

The catalytic pyrolysis of various hydrocarbon polymers such as aliphatic saturated, olefinic and aromatic compounds was studied in order to investigate the influence of catalysts on the composition of decomposition products. The following types of catalysts were used: pure metals, metal oxides, zeolites and amorphous or crystalline silicates. The order of efficiency of these catalysts for the recovery of polymers was also established.