Method and apparatus for the manufacture of a hydrocarbon...

C - Chemistry – Metallurgy – 07 – C

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C07C 9/02 (2006.01) B01J 3/04 (2006.01) B01J 19/00 (2006.01) B01J 19/18 (2006.01) C10L 3/06 (2006.01) F17C 11/00 (2006.01) F25J 1/02 (2006.01)

Patent

CA 2219244

A method of producing a stable hydrocarbon product in the form of hydrate of at least one hydrate-forming hydrocarbon surrounded by or suspended in a hydrocarbon-containing liquid. The invention comprises the actual product, a method of manufacturing the product as well as a plant for manufacturing the product. The process comprises the following steps: a) hydrate-forming hydrocarbons and water are brought together in a hydrate-generating zone (1) under hydrate-forming process conditions. Heat energy being released during the hydrate formation is removed from the zone by direct cooling with a first cooling medium. Thereby a first intermediate product is formed, having an average temperature which is equal to or higher than the freezing point of water; b) any non-converted water being present is removed from the first intermediate product, whereby a second intermediate product is obtained, being substantially free of non-converted water c) the second intermediate product is cooled in a cooling zone (80) by direct cooling with a second, hydrocarbon- containing cooling medium, to a final temperature being in average lower than the freezing point of water. The end product comprises particles in a solid, hydrate-containing material, which is surrounded by or suspended in a liquid hydrocarbon carrier medium at a vapour pressure being lower than the final pressure at the final temperature.

On décrit un procédé de production d'un hydrocarbure stable, sous la forme d'hydrate d'au moins un hydrocarbure à formation d'hydrate, entouré d'un liquide contenant un hydrocarbure, ou en suspension dans celui-ci. L'invention concerne ce produit, un procédé de fabrication ainsi que l'installation de production de celui-ci. Le procédé comprend les étapes suivantes: a) dans une zone (1) de production d'hydrate, on met ensemble des hydrocarbures à formation d'hydrate et de l'eau, que l'on soumet aux conditions du processus de formation d'hydrate. On enlève de cette zone l'énergie thermique libérée lors de la formation d'hydrate, par refroidissement direct à l'aide d'un premier milieu de refroidissement. On obtient ainsi un premier produit intermédiaire, lequel possède une température moyenne égale ou supérieure à celle du point de congélation de l'eau. b) On enlève du premier produit intermédiaire toute l'eau présente et non transformée, obtenant ainsi un second produit intermédiaire, pratiquement dépourvu d'eau non transformée. c) Puis, dans une zone (80) de refroidissement, on refroidit ce second produit par contact direct avec un second milieu de refroidissement contenant des hydrocarbures, jusqu'à l'obtention d'une température se situant en moyenne en dessous du point de congélation de l'eau. Le produit terminal est composé d'un matériau solide, particulaire, contenant l'hydrate, entouré d'un milieu porteur liquide à base d'hydrocarbure, ou en suspension dans celui-ci, à une pression de vapeur inférieure à la pression finale existant à la température finale.

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