Showing papers on "Carbochemistry published in 1978"
TL;DR: A review of the properties and the structure of coals occupying the middle position in the coalification scale that show the best coking properties is presented in this article, with particular regard to their behaviour on heat treatment.
25 citations
Patent•
30 Aug 1978
TL;DR: In this paper, coal which is liquefied in the presence of a pasting solvent, is separated into an ash free and an ash containing coal liquefaction product, each of such products is delayed coked in separate zones with the vapors from such zones being introduced into a common combination coker-fractionator to recover ash containing and ash free coking recycle, pasting solvents for the liquid and lighter products.
Abstract: Coal which is liquefied in the presence of a pasting solvent, is separated into an ash free and an ash containing coal liquefaction product. Each of such products is delayed coked in separate zones with the vapors from such zones being introduced into a common combination coker-fractionator to recover ash containing and ash free coking recycle, pasting solvent for the liquefaction and lighter products. The process is particulary applicable to coal liquefaction products produced from high ash containing coals.
14 citations
01 Jan 1978
TL;DR: In this article, the authors present an assessment of the potential of NMR as a means for determining the distribution of stable isotopes incorporated into products during coal liquefaction in coal-conversion processes.
Abstract: Publisher Summary The need for compositional data on coal and environmentally acceptable fuels from coal was dictated primarily by the recent energy shortages experienced by many nations. Compositional data are important not only in evaluating fuels for their intended end use but also as an aid in the solution of problems associated with the development of economical and efficient coal-conversion processes This chapter discusses nuclear magnetic resonance (NMR) studies of whole coals, solvent extracts of coals, and products from a specific coal liquefaction process development unit. The chapter presents an assessment of the potential of NMR as a means for determining the distribution of stable isotopes incorporated into products during coal liquefaction. The chapter presents the applications of NMR spectrometry in coal research.
9 citations
01 Jan 1978
TL;DR: The analysis of trapped organic compounds in coals and pyrolysis products analysis of oxidation products is discussed in this paper, which is useful for understanding the chemistry in coal conversion processes and in the search for new methods for converting coal.
Abstract: Publisher Summary This chapter discusses the techniques applied to a variety of problems and used for the study of coals and coal products. Mass spectrometry (MS) is an exceedingly useful analytical tool for the organic chemist. The chapter presents the analysis of trapped organic compounds in coals and pyrolysis products analysis of oxidation products. The identification of the aromatic units indigenous to the coal macromolecules obtained by these selective oxidative degradations is an important step in elucidation of the structures of coals. This information is very useful for understanding the chemistry in coal conversion processes and in the search for new methods for converting coal. The chapter also discusses the determination of aromaticity of coal by fluorination.
5 citations