Process of removing calcium and obtaining sulfate salts from...

C - Chemistry – Metallurgy – 13 – B

Patent

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Details

C13B 10/04 (2011.01) C13B 20/14 (2011.01) C01B 17/96 (2006.01) C01D 5/00 (2006.01) C01F 5/40 (2006.01) C01F 11/18 (2006.01) C01F 11/46 (2006.01) C05C 1/00 (2006.01) C05C 3/00 (2006.01) C05D 1/00 (2006.01) C05D 9/00 (2006.01)

Patent

CA 2697087

The present invention provides a process for obtaining a product stream comprising one or more sulfate salts of potassium, sodium or ammonium from a sugar stream resulting from [processing a lignocellulosic feedstock, said sugar stream which includes calcium sulfate and one or more of these sulfate salts. The process comprises (i) treating the sugar stream to remove calcium, thereby producing a sugar stream containing substantially no calcium, and obtaining a salt stream comprising a calcium salt;(ii) choosing a feed stream that is either (a) a clarified salt stream derived from the salt stream of step (i) after removal of calcium therefrom; or (b) the sugar stream containing substantially no calcium that is produced in step (i); (iii) introducing the feed stream chosen in step (ii) to an ion exchange bed; and (iv) regenerating the ion exchange resin bed of step (iii) with sulfuric acid to produce the product stream.

La présente invention concerne un procédé permettant d'obtenir un flux de produit comportant un ou des sels sulfate de potassium, de sodium ou d'ammonium à partir d'un flux de sucre dérivé de traitement de charge lignocellulosique, ledit flux de sucre comprenant du sulfate de calcium et un ou plusieurs de ces sels sulfates. Le procédé comprend : (i) le traitement du flux de sucre pour éliminer le calcium, permettant ainsi de produire un flux de sucre sensiblement exempt de calcium, et d'obtenir un flux de sel comportant un sel de calcium ; (ii) la sélection d'un flux d'alimentation qui est soir (a) un flux de sel clarifié dérivé du flux de sel de l'étape (i) après élimination de calcium dudit flux; soit (b) le flux de sucre sensiblement exempt de calcium produit à l'étape (i) ; (iii) l'introduction du flux d'alimentation sélectionné à l'étape (ii) sur un lit d'échange ionique ; et (iv) la régénération du lit de résine échangeuse d'ions de l'étape (iii) avec de l'acide sulfurique pour produire le flux de produit.

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