Process for the production of olefins by autothermal cracking

C - Chemistry – Metallurgy – 10 – G

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C10G 11/20 (2006.01) C07C 5/48 (2006.01)

Patent

CA 2593852

The present invention provides a process for the production of olefins by autothermal cracking of a liquid paraffinic hydrocarbon-containing feedstock in the presence of a molecular oxygen-containing gas, wherein said process comprises (a) providing a liquid paraffinic hydrocarbon-containing feedstock, (b) mixing said liquid paraffinic hydrocarbon-containing feedstock with a diluent comprising steam, said diluent being pre-heated to a temperature of at least 300~C, to produce a vaporised diluted liquid paraffinic hydrocarbon- containing feedstream comprising at least 20% by volume of steam, (c) subsequently mixing said vaporised diluted liquid paraffinic hydrocarbon- containing feedstream with a molecular oxygen-containing gas to produce a diluted mixed feedstream, (d) subsequently contacting said diluted mixed feedstream with a catalyst capable of supporting combustion beyond the normal fuel rich limit of flammability, to provide a hydrocarbon product stream comprising olefins.

La présente invention concerne un procédé pour la production d'oléfines par craquage autothermique d'une charge d'alimentation contenant un hydrocarbure paraffinique liquide en présence d'un gaz contenant de l'oxygène moléculaire, ledit procédé comprenant (a) la formation d'une charge d'alimentation contenant un hydrocarbure paraffinique liquide, (b) le mélange de ladite charge d'alimentation contenant un hydrocarbure paraffinique liquide avec un flux comprenant un diluant, ledit diluant étant préchauffé à une température d'au moins 300°C, pour produire une charge d'alimentation contenant un hydrocarbure paraffinique liquide vaporisée et diluée comprenant au moins 20 % en volume de vapeur, (c) le mélange à la suite de cela de ladite charge d'alimentation contenant un hydrocarbure paraffinique liquide vaporisée et diluée avec un gaz contenant de l'oxygène moléculaire pour produire une charge d'alimentation mélangée diluée, (d) la mise à la suite de cela en contact ladite charge d'alimentation mélangée diluée avec un catalyseur capable de supporter la combustion au-delà de la limite normale supérieure d'inflammabilité (mélange trop riche en combustible), pour produire un flux de produit hydrocarboné comprenant des oléfines.

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