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Various apparatus 988 Composition and analysis of
Testing for thiophen
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According acid alcohol ammonia anthracene apparatus benzene benzol boiling bottom carbon carried causes cent Chem closed coal coal-tar coke coke-ovens colour compounds considerable contains continued cooling creosote oil crude described dissolves distillation easily employed especially fire flues formed fraction fuel gases Germany gives heating heavy higher hydrocarbons iron latter less light oil lignite liquid lower manufacture means mixed mixture naphthalene obtained occur ordinary ovens paraffin pass patent petroleum phenol pipe pitch portion possible prepared present pressure proved pure quantity receiver remains removed residue retort separated shown side similar smell soluble solution sometimes specific steam stills substances sulphuric acid taken takes temperature toluene tons treated tubes usual vapours yield