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DE561183C
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Process for the extraction of phenols from coal tar and lignite tar with liquefied ammonia
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DE557595C
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Process for the extraction of phenols from tars using liquefied ammonia
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DE574678C
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Process for improving fuel oils from coal tar
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DE553410C
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Process for the production of pure phenol as well as cresols and benzene hydrocarbons from primordial tar phenols
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DE655685C
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Process for the production of phenols from hard coal tar and lignite tar
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DE523670C
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Method for purifying naphthalene
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DE604867C
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Process for the O- or C-alkylation of phenols
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DE524891C
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Process for polymerizing olefins
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DE492345C
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Process for the production of coumarone resin
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DE524987C
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Process for refining oils derived from coal
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DE513414C
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Process for carrying out Friedel-Crafts reactions
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DE595349C
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Process for the production of light- and air-resistant oils from raw coal tar oils
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DE504730C
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Process for polymerizing olefins
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DE489960C
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Process for cracking hydrocarbon oils
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DE503936C
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Process for refining petroleum
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DE507919C
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Process for polymerizing olefins
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DE501725C
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Process for refining oils derived from coal
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DE492840C
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Process for refining petroleum
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DE513862C
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Process for polymerizing olefins
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DE550429C
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Process for cleaning hydrocarbon oils
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