Chemistry of hydrocarbon compounds – Unsaturated compound synthesis
Patent
1984-12-31
1987-11-10
Davis, Curtis R.
Chemistry of hydrocarbon compounds
Unsaturated compound synthesis
585300, 585415, 585417, 585541, 585661, 585943, C07C 200
Patent
active
047059087
ABSTRACT:
Natural gas hydrocarbon components, methane to butanes, are converted into low-vapor-pressure liquid hydrocarbons in a combination process which comprises successively passing the heavier fraction (C.sub.2 to C.sub.4) and the lighter fraction (C.sub.1, C.sub.2) with hydrogen over a non silica-based catalyst including crystals of basic mixed oxides and recovering C.sub.5 + hydrocarbons. First the heavier fraction of the feed (C.sub.2 +) is converted at temperatures below 600.degree. C. over a fluidized or moving catalytic bed. Condensible C.sub.3 + products are fractionated for C.sub.5 + recovery and for C.sub.3, C.sub.4 recycling. Gas by-products H.sub.2, C.sub.1, C.sub.2, are separated into an enriched hydrogen stream and into a C.sub.1, C.sub.2 by-product gas which is recycled into the lighter fraction C.sub.1, C.sub.2 of the feed. The resulting lean gas mixture is then reacted with an ionized hydrogen plasma derived from the enriched hydrogen stream, in the presence of the same catalyst in a short residence time reactor. The catalyst, introduced in this reactor at a temperature below 600.degree. C. is also used as a heat transfer medium to quench the reaction. The condensible product in the gaseous effluent from the short residence time reactor is recovered and the gaseous by-products are recycled to the separation unit for hydrogen extraction. The process is of particular interest where natural gas has a relatively low market value.
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