Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1996-10-11
1998-08-11
Straub, Gary P.
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
423522, 423551, 423DIG14, 210660, 210670, C01D 500, C01B 1790
Patent
active
057924414
ABSTRACT:
A process employing a fixed-resin bed Acid Retardation Unit (ARU) to separate spent acid from chlorine dioxide generators into a de-acidified sodium sulfate component and a purified sulfuric acid component. The de-acidified sodium sulfate produced is returned to the chemical recovery cycle of the kraft mill in place of acidic chlorine dioxide generator effluent thereby avoiding the destruction of alkalinity in pulp mill liquors. In addition, sulfuric acid is purified providing an opportunity for reuse in various mill applications, and/or concentrated and recycled to the generator. Alternatively, to avoid high evaporation costs, the purified acid can be used to regenerate a cation-exchange unit (CEU) used in the conversion of sodium chlorate to a sodium chlorate/chloric acid mixture which is fed to the generator in place of sodium chlorate and sulfuric acid. Using this approach, the sulfuric acid requirement of chlorine dioxide generators and, in turn, the amount of acidic generator effluent can be reduced. The process is applicable to both atmospheric and subatmospheric chlorine dioxide generators. In the latter case, the concentration of the purified sulfuric acid from the ARU or any other acid separation system can be increased by using a portion of it to dissolve the sodium sesquisulfate by-product from such generators.
REFERENCES:
patent: 3067007 (1962-12-01), Hatch et al.
patent: 3099529 (1963-07-01), Hatch et al.
patent: 3810969 (1974-05-01), Schlumberger
patent: 3975505 (1976-08-01), Fuller
patent: 4081520 (1978-03-01), Swindells et al.
patent: 4104365 (1978-08-01), Howard et al.
patent: 4325934 (1982-04-01), Swindells et al.
patent: 4483740 (1984-11-01), Parkinson et al.
patent: 4678654 (1987-07-01), Holmstrom et al.
patent: 4678655 (1987-07-01), Twardowski
patent: 4798715 (1989-01-01), Hardee et al.
patent: 4915927 (1990-04-01), Lipsztajn et al.
patent: 5064514 (1991-11-01), Caulfield et al.
patent: 5084148 (1992-01-01), Kaczur et al.
patent: 5108560 (1992-04-01), Cawfield et al.
patent: 5116595 (1992-05-01), Scribner et al.
patent: 5174868 (1992-12-01), Lipsztajn et al.
patent: 5223103 (1993-06-01), Kaczur et al.
patent: 5242552 (1993-09-01), Coin et al.
Vulikh et al. "Ion Exchange Production of Acids from Salts", Metody Poluch, Khim. Reaktiv Prep., 16, pp. 5-13, 1967 no month.
Taube, H. and Dodgen, H., J. Amer. Chem. Soc. 71:3330-3336 (1949) Oct. "Applications of Radioactive . . . ".
Luther, R. and McDougall, F.H., Z. Physik Chem. 62:199-242(1908) no month "Die Kinetik . . . ".
Mendiratta, S.K. CPPA 79th Ann. Mtg. Tch. Sec. CPPA A193-A196, Montreal, Que. (Jan. 1993) "Extra Low Aox . . . ".
Charles, J. Pulp & Paper Can. 88(10): (1987) no month, pp. 43-44 "Stora Mill Will . . . ".
Smook, G.A. Handbook for Pulp and Paper Technologists, Joint Textbook Committee of the Paper Industry, 158-160(1982) no month.
Szell, M. & Fredette M., CPPA 80th Ann. Mtg. Tech. Sec. Montreal, Que. A211-A215 (Jan. 1994) "The Development of the ERCO Rio Process".
Michaud et al, "Ion Exchange Resin", Jan. 1990, pp. 44-47, 51.
Paleologou et al. J. Pulp and Paper Sci., 20(2), J39-J45 (1994) Feb. "Sodium Chlorate Splitting . . . ".
Paleologou et al. Pulp and Paper Canada, 95(10), T386-T390 (1994) no month "Membrane Technologies . . . ".
Hatch et al, "Acid Retardation . . . ", I&EC Process Design and Development.
Paleologou et al., J. Pulp Paper Sci. 22(1), J1-J7 (1996) Jan. "Bipolar Membrane . . . ".
Indu, B. Hoq, M.F. and Ernst, W.R., AIChE Journal, 37(11):1744-1748 (1991) Nov. "Acidity of Sulfuric Acid . . . ".
Brown Craig J.
Paleologou Michael
Sheedy Michael
Thompson Rokhsareh
Eco-Tec Limited
Pulp and Paper Research Institute of Canada
Renault Swabey Ogilvy
Straub Gary P.
Vanoy Timothy C.
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