Patents by Inventor Heinz Karwat
Heinz Karwat has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 4668488Abstract: Process for the treatment of CO-rich gases incurred in the manufacture of phosphorus, which gases contain impurities like water, and compounds of sulfur, nitrogen and phosphorus. The gas is passed through regenerators for the purpose of removing impurities. In this manner, a product gas is obtained from which impurities have been condensed or frozen.Type: GrantFiled: October 24, 1985Date of Patent: May 26, 1987Assignee: Linde AktiengesellschaftInventors: Gerhard Ranke, Heinz Karwat
-
Patent number: 4609389Abstract: Gaseous components are scrubbed from gaseous mixtures with a physical solvent; the latter, after absorption of the scrubbed-out gaseous components, is regenerated by expansion and stripping, wherein the gaseous fraction being released is discharged and the regenerated solvent is recycled into the scrubbing step. To reduce the content of solvent vapors in the gases to be exhausted into the atmosphere, the released gaseous fraction is cooled in heat exchange with non-thermally degasified solvent in order to condense out entrained solvent vapors from the gaseous fraction.Type: GrantFiled: December 18, 1984Date of Patent: September 2, 1986Assignee: Linde AktiengesellschaftInventor: Heinz Karwat
-
Patent number: 4522638Abstract: A process for regulating the NH.sub.3 content in an organic liquid that acts as a physical scrubbing agent and is used in a procedure for absorbing sour gases from gaseous mixtures. To ensure undisturbed and reliable carrying out of the scrubbing process, an ammonia-precipitating precipitant is added to the scrubbing agent and the precipitate is then separated from the scrubbing agent. Preferred precipitants include sulphuric acid and phosphuric acid. The ammonia salts are effective fertilizers.Type: GrantFiled: May 22, 1984Date of Patent: June 11, 1985Assignee: Linde AGInventor: Heinz Karwat
-
Patent number: 4515760Abstract: The NH.sub.3 content is regulated in methanol used in a process for scrubbing out sour gases from gaseous mixtures and/or for preventing ice formation prior to the scrubbing step. The methanol is freed, after the scrubbing step, respectively of absorbed gaseous components and/or water, and reused in the cycle as scrubbing liquid and/or for preventing ice formation. A strong acid is added to the methanol from water-soluble ammonium salts. Thereby, dissolved salts are formed which are removed together with water. Deleterious trace acids are also removed by an analogous treatment with a basic compound. The acid/base treatments are conducted in succession.Type: GrantFiled: December 21, 1983Date of Patent: May 7, 1985Assignee: Linde AktiengesellschaftInventors: Roland Lang, Heinz Karwat
-
Patent number: 4492676Abstract: For preventing the fouling and/or plugging of apparatus with metallic sulfides in the processing and purification of synthesis gases contaminated with metal carbonyls, wherein the synthesis gases are scrubbed with a physical solvent, which solvent is regenerated and reused, an organic phosphite, e.g., trimethyl phosphite, and/or an organic phosphine, e.g., triethyl phosphine or triphenyl phosphine, is added as a complexing agent to the scrubbing media, preferably in between the scrubbing and absorption regenerating steps.Type: GrantFiled: February 16, 1984Date of Patent: January 8, 1985Assignee: Linde AktiengesellschaftInventors: Karl Baur, Heinz Karwat
-
Patent number: 4478798Abstract: For avoiding equipment fouling from metal sulfide deposition in the processing of cracked gases containing H.sub.2 S and CO, the reactive metal species capable of carbonyl formation are prevented from contacting equipment parts operating within a temperature range favoring the formation of metal carbonyls, e.g., 30.degree.-250.degree. C. To accomplish this, the cracked gas is subjected to solids separation to remove dust particles containing the reactive metal species, or the cracked gas is oxidized to inactivate the metal species. Cooling water is also subjected to a preceding step of removing the reactive metal species.Type: GrantFiled: December 8, 1982Date of Patent: October 23, 1984Assignee: Linde AktiengesellschaftInventor: Heinz Karwat
-
Patent number: 4474740Abstract: Method and apparatus for regenerating physically acting organic scrubbing agents laden with sulfur dioxide and/or sulfur trioxide and eventually carbon dioxide in the course of a gas purification process. Equipment costs and energy losses are reduced by adding ammonia and, if necessary, water, to the laden scrubbing fluids and then separating the resultant ammonia sulfite and/or ammonia sulfate. Large differences in temperature between the scrubbing steps and the regenerating steps are not needed. A beneficial energy balance results.Type: GrantFiled: October 18, 1982Date of Patent: October 2, 1984Assignee: Linde AktiengesellschaftInventors: Heinz Karwat, Peter Haussinger
-
Patent number: 4436707Abstract: Methods for removing acidic gases from gaseous mixtures, such as hydrocarbon containing gaseous mixtures, are disclosed. The method includes washing the gaseous mixtures with a methanol wash stream containing more than about 0.5 weight percent ammonia therein, so as to remove at least a portion of the acidic gases from the gaseous mixtures and to produce a laden methanol stream containing said acidic gases therein, regenerating said laden methanol stream by removing a portion of said acidic gases therefrom, so as to regenerate said wash stream, and recycling the regenerated wash stream.Type: GrantFiled: June 30, 1983Date of Patent: March 13, 1984Assignee: Linde AktiengesellschaftInventor: Heinz Karwat
-
Patent number: 4399111Abstract: In the removal of sour gases by scrubbing with an aqueous alkali metal salt solution, e.g. a solution of K.sub.2 CO.sub.3, the circulating scrubbing liquid is gradually contaminated with organic acids, especially formic acid, which in turn ties up K.sup.+ as the formate which is ineffective for scrubbing purposes. To remove the organic acids, at least a partial stream of the circulating scrubbing liquid is subjected to an oxidation step under conditions leading to the oxidation of the salts of the organic acids, thereby liberating the bound alkali metal ions. If the scrubbing liquid contains an oxidizable activator, the latter can be extracted prior to oxidation of the scrubbing liquid and added back subsequent to the oxidation.Type: GrantFiled: April 14, 1982Date of Patent: August 16, 1983Assignee: Linde AktiengesellschaftInventors: Karl Baur, Eberhard Lassmann, Heinz Karwat
-
Patent number: 4381926Abstract: Methods and apparatus for scrubbing gaseous mixtures containing ammonia are disclosed in which the gaseous mixtures are contacted with methanol in a scrubbing column to remove any acidic gases therefrom, the methanol is separated from the acidic gases and recirculated, and at least a portion of the methanol is contacted with an ion exchange material so as to remove at least a portion of the ammonia therefrom. In one embodiment of the invention, the method and apparatus also includes addition of methanol to the gaseous mixture prior to contacting in the scrubbing column so as to produce a methanol-water mixture with any water contained in the gaseous mixture and prevent the icing thereof, and includes separating the methanol-water mixture from the gaseous mixture prior to contacting with the scrubbing column as well as separating the methanol from the water and recirculating the methanol.Type: GrantFiled: September 24, 1981Date of Patent: May 3, 1983Assignee: Linde AktiengesellschaftInventor: Heinz Karwat
-
Patent number: 4250150Abstract: Process for the treatment of gaseous mixtures, which contain sour gases, with organic solvents, characterized in that the treatment is conducted in the presence of alkaline-reacting compounds in order to prevent corrosion of apparatus parts made of iron or steel.Type: GrantFiled: January 2, 1979Date of Patent: February 10, 1981Assignee: Linde AktiengesellschaftInventors: Heinz Karwat, Roland Lang, Wolfgang Jelend
-
Patent number: 4155988Abstract: In a low temperature gas scrubbing process with a physical scrubbing solution, e.g., methanol, wherein either the H.sub.2 S containing gas-to-be-scrubbed, e.g., coal gasification gas, has a sufficient concentration of SO SO.sub.2 and/or O.sub.2 or wherein the H.sub.2 S containing scrubbing solution is brought into contact with a second O.sub.2 and/or SO.sub.2 containing gas, e.g. a stripping gas, to form elemental sulfur in the scrubbing solution, and said scrubbing solution is regenerated and then cooled to the scrubbing temperature, the improvement which comprises adding a sufficient amount of cyanides to the scrubbing solution to convert the elemental sulfur to thiocyanate, whereby sulfur is not precipitated in the scrubbing solution which would have otherwise occured, and removing the thiocyanate at least partially from the scrubbing solution. The cyanides may be added to the gas-to-be-scrubbed or the scrubbing solution, or there may be sufficient hydrocyanic acid in the gas-to-be-scrubbed at the outset.Type: GrantFiled: January 28, 1977Date of Patent: May 22, 1979Assignee: Linde AktiengesellschaftInventors: Heinz Karwat, Wolfgang Jelend
-
Patent number: 4081257Abstract: Aqueous glycol solutions, used for example, in the de-icing of heat exchange surfaces used in defogging systems, are regenerated by freeze crystallization, the ice being separated with relatively little loss of glycol.Type: GrantFiled: March 30, 1976Date of Patent: March 28, 1978Assignee: Linde AktiengesellschaftInventors: Eberhard Lassmann, Heinz Karwat
-
Patent number: 3935188Abstract: In a process for the removal of hydrogen cyanide from raw gases containing at least one other acidic component selected from the group consisting of hydrogen sulfide, carbonyl sulfide and mixtures thereof comprising scrubbing said other components from the gases with a scrubbing agent, regenerating resultant loaded scrubbing agent, and recycling resultant regenerated scrubbing agent to the scrubbing step,The improvement wherein the hydrogen cyanide is scrubbed out simultaneously with the other acidic components, resultant loaded scrubbing agent is mixed with an aqueous alkali metal or alkaline earth hydroxide solution, and the thus-formed cyanide salt solution is thermally converted into ammonia and formate.Type: GrantFiled: December 10, 1973Date of Patent: January 27, 1976Assignee: Linde AktiengesellschaftInventor: Heinz Karwat