A process and apparatus for obtaining paraffins or paraffin...

C - Chemistry – Metallurgy – 10 – G

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C10G 73/36 (2006.01) B01D 9/00 (2006.01) C10G 31/06 (2006.01) C10G 73/02 (2006.01) F28C 3/00 (2006.01) F28F 3/00 (2006.01)

Patent

CA 2242051

A process for fractional crystallisation of paraffin from mineral oil based and synthetic crude paraffin, wherein crude paraffin having a high oil content is crystallised in a crystalliser equipped with perforated metal sheets (31) extending in a zigzag in the spaces between the heat exchanger surfaces (39). The paraffin-containing melt is only solidified to an extent such that the fractions and oils for discharge remain liquid and are run off without total solidification of the melt. The perforated sheets (31) support the layers of crystals (43) and during sweating the paraffin is detached in strips from the heat exchanger surface (39) and is adapted to rest on the sloping perforated sheets (31). The inclination of the perforated sheets (31) guides and moves the paraffin strips (53), so that the paraffin strips remain in contact with the heat exchanger surfaces (39) while being pressed by their own weight along the inclined surface (30) towards the heat exchanger surfaces (39).

Procédé de cristallisation fractionnée de la paraffine à partir d'une paraffine à base d'huile minérale et de brut synthétique. La paraffine brute démontrant une teneur en huile élevée est cristallisée dans un appareil de cristallisation doté de feuilles métalliques perforées (31) s'étendant en zigzag entre les surfaces de l'échangeur thermique (39). Le produit de fusion contenant de la paraffine est seulement solidifié à un certain degré, afin que les fractions et les huiles de décharge demeurent liquides et s'écoulent sans une solidification totale du produit de fusion. Les feuilles perforées (31) supportent les couches de cristal (43). Durant l'exsudation, la paraffine est détachée en bandes de la surface de l'échangeur thermique (39) et peut reposer sur les feuilles perforées en pente (31). L'inclinaison des feuilles (31) permet de guider et de déplacer les bandes de paraffine (53) de façon à ce qu'elles demeurent en contact avec les surfaces de l'échangeur thermique (39), tout en étant pressées par leur propre poids le long de la surface inclinée (30) contre les surfaces de l'échangeur thermique (39).

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