Chemistry of hydrocarbon compounds – Saturated compound synthesis – From nonhydrocarbon feed
Patent
1995-07-20
1998-09-22
Caldarola, Glenn
Chemistry of hydrocarbon compounds
Saturated compound synthesis
From nonhydrocarbon feed
502 38, 502 53, 502 56, C07C 126, B01J 2034
Patent
active
058116281
ABSTRACT:
A method for the hydrodechlorination of a reaction gas primarily composed of chlorinated hydrocarbons is carried out sequentially. A first step is advantageously carried out in a tubular reactor filled with catalyst and cooled externally, to maintain a temperature within a preferred range of 80.degree. to 230.degree. C. and a radial temperature difference of not more than 40.degree. C. Hydrogen is added to the tubular reactor with a hydrogen excess in a preferred range of 1.1 to 1.5 relative to the reaction gas, based on the stoichiometric consumption. The catalyst is present in a catalyst loading in a preferred range of 0.1 to 1.5 v/vh based on the volume of reaction gas. A fixed bed reactor is advantageously used for a second step, optimally connected in straight transit with the output of the reactor of the first step. The full-space reactor is maintained at a temperature within a preferred range of 200.degree. to 300.degree. C. and a hydrogen excess relative to the stoichiometric consumption is in a preferred range of 2 to 100. Catalyst is present in a preferred amount related to a volume of catalyst in step one according to a ratio in a range of 2:1 to 10:1. The dechlorination is preferably carried out at pressures between 1 and 50 bar. A method is further provided for regenerating deactivated catalysts without accumulation of dioxin in the waste gas, achieved by a reducing treatment, followed by an oxidizing treatment at a temperature at or above the last operating temperature of the catalyst.
REFERENCES:
patent: 3634292 (1972-01-01), Hayes
patent: 3855347 (1974-12-01), Oricchio
patent: 4524234 (1985-06-01), Kaiser
patent: 5155075 (1992-10-01), Innes et al.
patent: 5177268 (1993-01-01), Balko et al.
Birke Peter
Geyer Reinhard
Haertwig Werner
Hoppe Anette
Neumann Ulrich
Buck Werke GmbH und Co.
Caldarola Glenn
Dang Thuan D.
Leuna-Katalysatoren GmbH
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