Manufacture of high-strength, low-salt sodium hypochlorite...

C - Chemistry – Metallurgy – 01 – B

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C01B 11/06 (2006.01)

Patent

CA 2674044

A method for continuous manufacture of higher-strength, lower-salt, aqueous sodium hypochlorite bleach from lower-strength aqueous sodium hypochlorite bleach that has some sodium hydroxide and that is essentially free of sodium chloride (salt) crystals, aqueous sodium hydroxide solution having a concentration by weight within a range from about 45% to about 51%, chlorine in gas and/or liquid phase that may or may not include inerts, and a recycle solution. Slurry is withdrawn from the tank at a level below where the lower-strength bleach, the sodium hydroxide solution, the chlorine, and the recycle solution begin to mix with slurry already in the tank. A first portion of the slurry is withdrawn and used as the recycle solution. A second portion of the slurry is withdrawn and processed to separate substantially all salt crystals from residual liquid that is recovered as the higher-strength lower-salt, aqueous sodium hypochlorite bleach.

L'invention concerne un procédé de fabrication en continu d'un agent de blanchiment à base d'hypochlorite de sodium aqueux, à teneur inférieure en sel, de force supérieure, à partir d'un agent de blanchiment à base d'hypochlorite de sodium aqueux de force inférieure, qui contient de l'hydroxyde de sodium et qui est pratiquement exempt de cristaux de chlorure de sodium (sel), d'une solution aqueuse d'hydroxyde de sodium ayant une concentration en poids se situant dans une plage d'environ 45 % à environ 51 %, du chlore en phase gazeuse et/ou liquide qui peut ou peut ne pas comprendre d'inertes, et une solution de recyclage. Une bouillie est retirée du réservoir à un niveau au-dessous de là où l'agent de blanchiment de force inférieure, la solution d'hydroxyde de sodium, le chlore et la solution de recyclage commencent à se mélanger avec la bouillie déjà dans le réservoir. Une première partie de la bouillie est retirée et utilisée en tant que solution de recyclage. Une seconde partie de la bouillie est retirée et traitée pour séparer sensiblement tous les cristaux de sel à partir du liquide résiduel qui est récupéré sous forme d'agent de blanchiment à base d'hypochlorite de sodium aqueux, à teneur inférieure en sel, de force supérieure.

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