Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...
Patent
1995-02-14
1996-07-16
Phasge, Arun S.
Chemistry: electrical and wave energy
Processes and products
Electrophoresis or electro-osmosis processes and electrolyte...
204523, 204525, 204539, B01D 6144
Patent
active
055363849
ABSTRACT:
A process using an electrodialysis system employing cation-selective membranes and anion-selective membranes, particularly monovalent anion-selective membranes is used to separate kraft pulping liquors into two streams; one that is rich in sulphides (to be used in the initial stage of pulping), and another that is poor in sulphides (to be used in the final stage of pulping). By separating pulping liquors in this way, the sulphur balance in the kraft process can be maintained while obtaining the benefits of modified pulping. The same electrodialytic system can be used to separate green and polysulphide liquors into sulphide-rich and sulphide-poor components.
REFERENCES:
patent: 3933610 (1976-01-01), Ehara et al.
patent: 4207157 (1980-06-01), Hirai et al.
patent: 4325792 (1982-04-01), Vaughan
patent: 4715939 (1987-12-01), Ball et al.
patent: 4717450 (1988-01-01), Shaw et al.
patent: 5082526 (1992-01-01), Dorris
patent: 5110432 (1992-05-01), Boateng
patent: 5292407 (1994-03-01), Roy et al.
patent: 5324403 (1994-06-01), Kennedy et al.
Chemical Abstracts vol. 74, 1971, Item 57156n. (no month).
MCC-Modified continuous kraft pulping-now a reality (B. Johansson et al., Svenski Papperstidning nr 10, 30-35 1984). no month.
EMCC-Extended delignification with a prolonged mild counter-current cooking stage. (J. E. Jiang et al. APPITA, 45 (1), 19, 1992) no month.
Modified kraft processes for softwood bleached-grade pulp. (S. Norden and A. Teder, TAPPI, 62(7), 49-51, Jul. 1979.
Extended delignification by combination of modified kraft pulping & oxygen bleaching. (A. Teder & L. Olm, Paperi ja Puu 63(4a), 315-322, 1981 no month.
Improved modified kraft cooking Partl. Pretreatment with a sodium sulfide solution. B. Mao et al. 1992, Paperi ja Puu, Paper&Timber vol. 74, #6,491-494 no month.
CTAPI, Proceedings of 7th Int. Symp. on Wood and Pulping Chemistry vol. 1 337-347, Beijing, P. R. China, May 25-28, 1993, J. E. Jiang et al. nth.
Extended delignification in kraft cooking through improved selectivity. K. Sjoblom et al., Paperi ja Puu-Paper and Timber 5,452-460, 1988 no month.
Improved modified kraft cooking. B. Mao and N. Hartler, Nordic Pulp and Paper Research Journal, No. 4, 168-173, 1992. no month.
Extended modified cooking of Southern pine with polyslufide:effects on pulp yield..J. E. Jiang, TAPPI, 77(2), 120-124, Feb. 1994.
NSSC recovery process uses direct oxidation. (S. Mizuguichi & T. Naito, Pulp & Paper Canada, 79(8), T251-253, 1978.).
Liquor heat treatment & its impact on chemical recovery. (R. Ryham et al. Proceedings of 4th SPCI Int Conf Bookl, pp. 266-280, Bologna, IT, May 19-22, 1992).
Chemical recovery technology for future fiber production. DESULPHUR process. (R. Ryham et al. 80th Ann. Mtng. CPPA Tech. Sect. B179-B190, Feb. 1994).
Ion transport through monovalent-anion-permselective membranes (G. Saracco et al. Ind. Eng. Chem. Res. 33, 96-101, 1994) no month.
Novel Application of monovalent-ion-permselective membranes to the recovery treatment . . . Ind. Eng. Chem. Res. 32, 675-662, 1993 G. Saracco et al. no month.
Thinly Resin Coated Cation-Exchange Resin Membrane with Permselectivity Between . . . T. Yawataya et al. Dechema Monogr. 47, 501-514, 1962 no month.
Modification of the Transport Properties of Ion Exchange Membranes. IX. Layer . . . T. Sata et al. J. Membr. Sci. 45, 197-208, 1989 no month.
Modification of the Transport Properties of Ion Exchange Membranes. XII. Ionic . . . T. Sata et al. J. Membr. Sci. 45, 209-224, 1989 no month.
Production of Polysulfide Using a New Catalyst. M. Nakamura et al. Proceedings of the Tappi Pulping Conf. Atalanta 407, 1988 no month.
W. E. Lightfoot, New Catalyst Improves Polysulfide Liquor Makeup, O.sub.2 Delignification. Pulp & Paper, 64(1):88, 1990 no month.
Berry Richard M.
Paleologou Michael
Thompson Rokhsareh
Phasge Arun S,.
Pulp and Paper Research Institute of Canada
LandOfFree
Separation of sulphides from pulping liquors by electrodialysis does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Separation of sulphides from pulping liquors by electrodialysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Separation of sulphides from pulping liquors by electrodialysis will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1782218