Process for cooling solid and gaseous material during...

D - Textiles – Paper – 21 – C

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D21C 11/12 (2006.01)

Patent

CA 2365406

Process for the recovery of chemicals and energy from spent liquor obtained in the chemical pulping process, in which the spent liquor is gasified under sub-stoichiometric conditions to produce partly one phase of solid and/or fused material, together with partly one phase of a flammable gaseous material, whereafter the said phases are cooled by direct contact with a cooling medium (9), is separated from the said phase of flammable gaseous material in order to be dissolved and collected up as a product liquid in a product liquid receiver (11). According to the invention, the said cooling medium (9) consists of an essentially water-free cooling medium, which after vaporizing/cracking increases the calorific value of the flammable gaseous material drawn off. At the same time, the process is improved in this way since the flammable gases can be used more effectively for the purpose of e.g. generating energy.

L'invention concerne un procédé permettant de récupérer des produits chimiques et de l'énergie de la liqueur épuisée obtenue dans les procédés de réduction en pâte chimique, selon lesquels la liqueur épuisée est gazéifiée dans des conditions sub-stoechiométriques pour produire, d'une part, une phase de matière solide et/ou fondue et, d'autre part, une phase de matière gazeuse inflammable. Ces phases sont ensuite refroidies par contact direct avec un agent de refroidissement (9). La liqueur épuisée est séparée de ladite phase de matière gazeuse inflammable afin d'être dissoute et recueillie sous forme de produit liquide dans un collecteur de produit liquide (11). Selon l'invention, l'agent de refroidissement (9) est un agent de refroidissement sensiblement exempt d'eau qui, après vaporisation/fissuration, augmente la valeur calorifique de la matière gazeuse inflammable soutirée. En outre, ce procédé est amélioré en ce sens que les gaz inflammables peuvent être utilisés plus efficacement aux fins, par exemple, de production d'énergie.

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