Process for producing pitches from coal, tars and...

C - Chemistry – Metallurgy – 10 – C

Patent

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C10C 1/16 (2006.01)

Patent

CA 2556482

The invention relates to the production of brea from distillates arising from high temperature coal tar having a distillation range of more than 260 ~C, by means of sequential and combined application of three stages in mild pressure and temperature conditions (<400~ C, <10 bar g): oxidative thermal treatment used as a reagent for air or oxygen, mixtures thereof, or air which is low in oxygen; thermal treatment in an inert atmosphere and fractionated distillation. It is possible to obtain brea exhibiting environmental advantages and advantages in term of occupational health, which can be used as coal precursors.

L'invention concerne la production de brais appropriés à des applications multiples à partir de distillats provenant du goudron de houille à haute température avec une plage de distillation supérieure à 260 DEG C. A cet effet, trois étapes sont mises en oeuvre de façon combinée et dans des conditions douces de pression et de température (<400 DEG C, <10 bar g). Ces trois étapes sont les suivantes : traitement thermique d'oxydation utilisant comme réactif de l'air ou de l'oxygène, ses mélanges ou de l'air appauvri en oxygène ; traitement thermique dans une atmosphère inerte ; et distillation fractionnée. On obtient ainsi des brais qui présentent des avantages sur le plan écologique et sur le plan de la santé professionnelle et qui peuvent être utilisés comme précurseurs du charbon.

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