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| Number | Title | Issue Date |
| 7060650 | Hydrogenation catalysts and methods Catalysts and composite materials comprised of catalytically active materials intercalated with alkali metals and/or optionally coated on alkali metals or combinations of alkali and alkali earth metals are disclosed. Also disclosed are methods for enhancing reaction... | 06/13/2006 |
| 6585880 | Method for recovering chemicals in a process of producing pulp by kraft process In a process for producing kraft pulp, the process is made closed, the yield of pulp is improved and environmental problems are minimized. An alkaline solution containing Na2 S which flows in a process of producing kraft pulp, is electrolyzed b... | 07/01/2003 |
| 6517699 | Method for producing polysulfides by means of electrolytic oxidation The present invention has an object to obtain a cooking liquor containing polysulfide-sulfur at a high concentration by minimizing by-production of thiosulfate ions. The present invention is a method for producing polysulfides, which comprises introducing... | 02/11/2003 |
| 6428676 | Process for producing low alpha lead methane sulfonate This invention provides a process for the electrolytic production of metal containing solutions and in particular a high concentration low impurity low alpha lead methane sulfonate solution using a specially designed electrolytic membrane cell. The proces... | 08/06/2002 |
| 6319358 | Electrolytic causticizing of smelt from a kraft recovery furnace An electrochemical process is provided for treatment of molten kraft smelt produced from black liquor in a kraft recovery boiler. Treated smelt can be contacted with water to produce white liquor which can be re-used or recycled in the kraft process.... | 11/20/2001 |
| 6264819 | Method for producing polysulfide by electrolytic oxidation It is an object of the present invention to produce a cooking liquor containing polysulfide sulfur at a high concentration from white liquor in a pulp production process with a high selectivity at a low electric power with very little production of thiosu... | 07/24/2001 |
| 5716512 | Method for manufacturing salts of metals Process and equipment for manufacturing salts of metals, particularly nickel hypophosphite, are disclosed.... | 02/10/1998 |
| 5653861 | Electrochemical process The invention relates to a method of producing pulp comprising a step of forming green liquor containing alkali metal sulfide and alkali metal carbonate. The method further comprises a step of electrochemically treating the green liquor to oxidize at leas... | 08/05/1997 |
| 5637206 | Process for the electrochemical production of ammonium polysulfide The ammonium polysulfide is produced in at least one electrochemical cell, to which an aqueous ammonium sulfide solution is supplied as electrolyte. The cell comprises an anode, a gas diffusion cathode, and between the anode and the cathode an electrolyte... | 06/10/1997 |
| 5624545 | Production of polysulphide by electrolysis of white liquor containing sulphide Sulphide-containing white liquor is treated in a continuously operating electrolytic cell having separate anode and cathode compartments separated by a partially permeable barrier. White liquor is introduced into the anode compartment of the cell, and an ... | 04/29/1997 |
| 5578189 | Decomposition and removal of H2 S into hydrogen and sulfur The method of removing sulfurous compounds (organic and inorganic) from any fluid (gas or liquid) phase by contacting said fluid (gas or liquid) with the reactive metal to form a metal sulfide recovering said fluid (gas or liquid) free from said sulfurous... | 11/26/1996 |
| 5554270 | Electrolytic desilvering method The present invention relates to an electrolytic desilvering method for photographic effluents. This method is carried out in an electrolytic cell comprising at least one anodic compartment and at least one cathodic compartment. The photographic effluent ... | 09/10/1996 |
| 5536387 | Silver removal Effluent streams from photographic processes contain both silver and thiosulphate ions, and because of the formation of complex anions it is difficult to remove the silver. The silver may be removed using a cell (12) with a cathode (24) exposed to the eff... | 07/16/1996 |
| 4992148 | Process for the electrolytic manufacture of alkali metal sulphide Process for the manufacture of alkali metal sulphide, in which an electrolysis cell is used in which a membrane which is selectively permeable to cations separates an anode chamber containing an anode from a cathode chamber containing a cathode, an electr... | 02/12/1991 |
| 4978433 | Method for recovering silver from photographic processing solution There is disclosed a method for recovering silver from photographic processing solution by electrolysis, in which method the cathode potential is set at a potential range wherein a precipitate of silver sulfide is formed in the electrolytic cell. Accordin... | 12/18/1990 |
| 4526662 | Processes for the recovery of cyanide from aqueous thiocyanate solutions and detoxication of aqueous thiocyanate solutions A process for the recovery of cyanide from thiocyanate. An aqueous solution containing thiocyanate is introduced into an electrochemical reactor. The reactor is activated for an appropriate time period while the pH of the solution is maintained in the ran... | 07/02/1985 |
| 4073705 | Method for treating used or exhausted photographic fixing solution Removal of silver and reduction of COD value in used or exhausted photographic fixing solution are effectively conducted by electrolysis of reversing repeatedly polarity of positive and negative electrodes.... | 02/14/1978 |
| 4040917 | Preparation of intercalated chalcogenides Ions are intercalated in chalcogenides by flowing a current through a system comprising a cathode which contains the chalcogenides (e.g., TaS2 is a suitable chalcogenide), an anode containing electronically conductive material which is not a so... | 08/09/1977 |
| 3996118 | Method for promoting reduction-oxidation of electrolytically produced gases Gaseous products which tend to form at the anode or cathode of an electrolytic or electrochemical system in which the electrolyte is an aqueous medium may be converted into a reduction-oxidation reaction product through the action of a Contacogen. In such... | 12/07/1976 |
