Thermogravimetric on-line monitoring of transformation of carbon frameworks of organic carbon materials

Abstract

In this paper we used the method of data analysis thermogravimetry, based on the dynamics of conversion of individual structural fragments used the individual components, the so-called conversion online monitoring of structural components (number of pseudomacro fragments of organic matter of different types of carbon-containing materials). Thermolysis process of organic materials is implemented in a number of series-parallel processes in which an unstable intermediate products: there is a direct transition to solid sorbents, a systematic decrease in the mass of the solid residue, changes in the output of the gasandvapor phase, the emergence, growt hand disappearance of the liquid phase. At all stages of the process, these phases interact with each otherand each of themis involved in polycondensation processes lead into the formation of new liquid, solid and gas phases under going transformation in the subsequent stages of the thermolysis. The nature of the destruction of chemical bondsin the thermal decompositionis more dependenton the heating rate. With slow heating selectively destroyed the least stable aliphaticand hydroxylbond. At highheating rate accelerated thermal degradation of components, but lags behind the rate of increase in temperature therefore shifted to higher temperatures. If over heating of raw materials at the same time broken and weak, and astrongaromaticbond. Therefore, the destruction ofthe original organic matterbecomesmore random. This, of course, formed larger fragments of molecules of which are formed of the liquid phase heavy end sresins mainly as phaltenesen riched oxygen and nitrogen components. The greatest amount of unsaturated and unstable degradation products formed in the range of 620-700 К. As for organic materials, organic matter which contains the largest number less strong chemical bonds, the maximum intensity of formation of volatile products is shifted into a zone of low temperatures. With increasing degree of aromaticity of this maximum is shifted tohigher temperatures.