Formation Chemistry of the Fmmature coal gas

Guo Shaohui; Qin Kuangzong; Qian Jialin

Abstract

The Fanzhi brown coal (R°% 0. 28) was subjected to hydrous pyrolysis. The brown coal and solidpyrolyer residues (R°% 0.32y-0.68) were studied by ¹³ Cnmr. The Shulan(R°% 0.32) and Huangxianbrown coal(R°% 0. 68) were also analyzed by ¹³C nmr. The results indicated that progressive changesin the chemistry of early coal evolution are likely.(1) demethylation of guaiacyl units to form catechollike structures that are dominant components of the brown coal,(2) cleavage of aryl ether linkages toform phenols and reactive carbocations that alkylate the catechol rings and(3) dehydration of the cate-chol-like structuens to form alkyl phenols. Aromatic ring substitution index(σ)was nearly constant inthe early evolution. The results suggested that aromatic ring in ligin structure did not fuse to form pol-yaromatic rings beforeR°% 0. 7 and CH₄was one of the main products in the early coalification process.

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References

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Formation Chemistry of the Fmmature coal gas

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