Process Analysis and Mechanism of Multi-stage Hydropyrolysis of Coal

Abstract

Abstract: The mechanism of multi-stage hydropyrolysis of coal was probed through detailed analysis of products of hydropyrolysis with different holding methods. The results showed that the holding method significantly affects the product distributions, thus making an apparent difference in hydrogen utilization efficiency. The holding temperature should be about 350—500 ℃ during which more free radicals are produced rapidly. Pore-riched structures are formed at the holding stage at 350 ℃ due to the evolution of large amount of volatiles, which is favorable to the subsequent hydrogenation reaction. The holding at a low temperature favors the reaction of hydrogen with oxygen-containing groups, leading to the formation of phenol and avoiding the formation of water at a high temperature. The cleavage of chemical bonds in the char is mainly dependent on the pyrolysis temperature. The effect of holding stage is to change the distribution and components of products via stabilizing the free radicals and hydrogenating the heavier products.

Key words: Coal, Multi-stage hydropyrolysis, Process analysis, Mechanism

CLC Number:

O621

TrendMD:

LI Wen, WANG Na, LI Bao-Qing. Process Analysis and Mechanism of Multi-stage Hydropyrolysis of Coal[J]. Chem. J. Chinese Universities, 2002, 23(9): 1767.

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Process Analysis and Mechanism of Multi-stage Hydropyrolysis of Coal

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