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| Number | Title | Issue Date |
| 4465658 | Chlorine dioxide process Chlorine dioxide is formed at high efficiency from a solution of acid sodium chlorate at high sulphuric acid normality in excess of 9 normal to which methanol is fed. The reaction medium is at its boiling point under a subatmospheric pressure. The inciden... | 08/14/1984 |
| 4421598 | Bleaching procedure using chlorine dioxide and chlorine solutions The advantages of the serial application of chlorine dioxide and chlorine without intermediate wash during the bleaching of wood pulp in the absence of significant amounts of dissolved organic materials are improved by the presence of small quantities of ... | 12/20/1983 |
| 4409066 | Bleaching procedure using chlorine dioxide and chlorine solutions The adverse effects of dissolved organic material in the aqueous phase of pulp suspensions during bleaching using mixtures of chlorine dioxide and chlorine are overcome by applying the chlorine dioxide and chlorine serially to the pulp in two steps withou... | 10/11/1983 |
| 4366120 | Small scale chlorine dioxide plant Chlorine dioxide solution for use in waste water treatment is produced in an automated small scale plant wherein sodium chlorate solution is reacted with sulphur dioxide at subatmospheric pressure by countercurrent flow in a reaction tower. Water ejectors... | 12/28/1982 |
| 4325783 | Bleaching procedure using chlorine dioxide and chlorine solutions The adverse effects of dissolved organic material in the aqueous phase of pulp suspensions during bleaching using mixtures of chlorine dioxide and chlorine are overcome by applying the chlorine dioxide and chlorine serially to the pulp in two steps withou... | 04/20/1982 |
| 4325934 | Production of chlorine dioxide with conversion of by-product solid phase sodium acid sulphate to its neutral form A highly efficient chlorine dioxide generating process which produces chlorine-free chlorine dioxide and neutral solid phase sodium sulphate from sodium chlorate, sulphuric acid and methanol is described. Solid phase sodium acid sulphate recovered from th... | 04/20/1982 |
| 4290998 | Washing apparatus in chlorine dioxide production Washing apparatus for the washing of by-product salts from chlorine dioxide generating processes comprising a multi-stage decantation washer.... | 09/22/1981 |
| 4203957 | Modified phosphorus furnace operation A more efficient and economical phosphorus furnace process with much improved and safer working conditions is described. The process is carried out without an electrostatic precipitator, while ensuring that the furnace exit gases are at consistently low t... | 05/20/1980 |
| 4203961 | Chlorine dioxide generation process The entrainment of reaction medium in the vapor phase is decreased in a chlorine dioxide generator producing a gaseous mixture of chlorine dioxide, chlorine and steam from a boiling reaction medium and wherein generator liquor is recycled with make up che... | 05/20/1980 |
| 4194961 | Electrode spacer element A spacer element for spacing apart interleaved electrodes in an electrolytic cell is constructed of electrically non-conducting and corrosion-resistant material. The spacer element has an integral one-piece structure including a short cylindrical portion ... | 03/25/1980 |
| 4194953 | Process for producing chlorate and chlorate cell construction A sodium chlorate plant comprising a plurality of cell units linked in parallel flow relationship is described. The plant utilizes a single acidification, brine make up and heat exchange for liquor circulating therein. Each cell unit includes a plurality ... | 03/25/1980 |
| 4188367 | Manufacture of red phosphorus Particulate red phosphorus is obtained by thermal conversion of white phosphorus in an essentially dry process in which liquid white phosphorus is injected onto a bed of red phosphorus particles preheated to a temperature above the thermal conversion temp... | 02/12/1980 |
| 4154809 | High efficiency chlorine dioxide production using HCl as acid and methanol addition The efficiency of a low actual hydrogen ion concentration chlorine dioxide producing process in which a chlorate and hydrochloric acid or hydrogen chloride are fed to a reaction medium in a single vessel generator-evaporator crystallizer is increased by t... | 05/15/1979 |
| 4115307 | Phosphate composition A low density, free-flowing, granular phosphate product having a high oil absorption capacity and capable of dissolving in water to provide a solution of pH about 7 to 8 is provided by mixing a hydratable alkali metal phosphate, polyphosphoric acid, and s... | 09/19/1978 |
| 4086328 | Production of chlorine dioxide from buffered reaction media Chlorine dioxide is produced in a continuous process by reaction of sodium chlorate and hydrochloric acid. The reaction medium is maintained at its boiling point under subatmospheric pressure and the resulting steam is used to dilute the chlorine dioxide ... | 04/25/1978 |
| 4086329 | Integrated chlorine dioxide producing system Chlorine dioxide and chlorine are produced by reduction of sodium chlorate with chloride ions in an aqueous acid medium having a total acid normality of 2 to 4.8 normal. The reaction medium is maintained at its boiling point under a subatmospheric pressur... | 04/25/1978 |
| 4075308 | Production of chlorine dioxide at high efficiency Chlorine dioxide is produced in a continuous process by reaction of sodium chlorate and hydrochloric acid. The reaction medium is maintained at its boiling point under subatmospheric pressure and the resulting steam is used to dilute the chlorine dioxide ... | 02/21/1978 |
| 4049513 | Treatment of cell anodes An electrode having a conductive platinum alloy coating and which has deteriorated in use in an electrolytic chlorate cell is heat treated at elevated temperatures of above 300° C to regenerate the coating. The regeneration of the coating is exhibited by... | 09/20/1977 |
| 3975506 | Production of chlorine dioxide A chlorine dioxide-producing process is provided in which water vapor is used to dilute and remove the chlorine dioxide produced from sodium chlorate and hydrochloric acid from the reaction vessel. A cyclic arrangement is provided in which the recycle liq... | 08/17/1976 |
| 3971707 | Oxidation of phosphorus in aqueous medium Elemental phosphorus in electrothermal phosphorus plant effluents is oxidized either by anodically produced atomic oxygen or by an anodically produced mixture of atomic chlorine and atomic oxygen. The elemental phosphorus content of the effluents may be l... | 07/27/1976 |
