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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7442348 | Sulfur-bearing residue treatment system A sulfur-bearing residue treatment system is provided for the recovery of valuable organic components and the reduction of capital costs and operating costs. The treatment system involves the use of a stripping vessel in conjunction with a heating apparatus. All ele... | 10/28/2008 |
| 7241323 | Pyrolysis process for producing fuel gas Solid waste resource recovery in space is effected by pyrolysis processing, to produce light gases as the main products (CH4, H2, CO2, CO, H2O, NH3) and a reactive carbon-rich char as the main byproduct. Signifi... | 07/10/2007 |
| 7169197 | Pyrolysis processing for solid waste resource recovery Solid waste resource recovery in space is effected by pyrolysis processing, to produce light gases as the main products (CH4, H2, CO2, CO, H2O, NH3) and a reactive carbon-rich char as the main byproduct. Signifi... | 01/30/2007 |
| 6827912 | Gasification reactor vessel The invention relates to a reactor vessel and method for the gasification of carbon-containing fuel, residual and waste materials using an oxygen-containing oxidizing agent and in a reaction chamber which is designed as an entrained-bed reactor, at pressures between... | 12/07/2004 |
| 6797240 | Process and apparatus for the extraction and regeneration of acids from spent acids Process and apparatus for regenerating spent acid liquor includes a primary roasting furnace for evaporating a substantial portion of the liquid from the spent acid to produce acid vapors and partially roasted metal salts. The partially roasted metal salts are trans... | 09/28/2004 |
| 6627784 | Highly efficient method of mixing dissimilar fluids using mechanically induced cavitation A method of mixing two or more dissimilar fluids such a gas and a liquid is provided. The method includes the steps of introducing one fluid into the other to form a mixture, inducing cavitation in the mixture to reduce at least one of the fluids to a lar... | 09/30/2003 |
| 6500301 | Apparatus for gasification of spent liquor Arrangement for understoichiometric gasification of spent liquor from chemical pulp production, comprising an upper reactor part (2), which upper reactor part is provided with a burner (5) for the spent liquor and with an internally clad reactor jacket (4... | 12/31/2002 |
| 6287415 | Arrangement in soda recovery boiler for removing melts for maintenance Arrangement in a soda recovery boiler, comprising normal melt chutes (6) for removing molten salt from the recovery boiler (1). The recovery boiler (1) comprises an outlet (8), mounted in the wall of the recovery boiler such that it is situated lower down... | 09/11/2001 |
| 6178898 | Recovery boiler In a recovery boiler for burning spent liquor of a pulp mill, a combustion chamber has heat transfer walls formed of tubes, at least one vertical heat transfer surface formed of tubes, and superheaters in an upper part of the combustion chamber for recove... | 01/30/2001 |
| 6146604 | Method of removing nitrogen oxides from recovery boiler flue gases A method of removing nitrogen oxides from flue gases of a cellulose pulp mill recovery boiler does so in a cost effective and environmentally friendly manner. In the heat recovery section of the recovery boiler, a peroxide solution (e.g. a water solution ... | 11/14/2000 |
| 6030493 | Process for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers Provided is a process for recovering chemicals and energy from spent liquor obtained when producing paper pulp by chemical delignificatation of fibrous raw material. The spent liquor is gasified in at least two reactors, a first and a second stream of sol... | 02/29/2000 |
| 6027609 | Pulp-mill recovery installation for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers A Pulp Mill Recovery installation for producing liquors containing different concentrations of recovered process chemicals or combustion gasses containing different concentrations of process chemicals from a spent liquor obtained from the production of pu... | 02/22/2000 |
| 6007680 | Apparatus for safely conducting pressurized peroxide bleaching Apparatus for safely carrying out pressurized peroxide bleaching of pulp in a bleaching vessel at a consistency exceeding 8%, the bleaching vessel designed for at least 0.5 MPa overpressure, with the pulp being pumped to the bleaching vessel through a mix... | 12/28/1999 |
| 5992337 | Methods of improving productivity of black liquor recovery boilers Methods of increasing the throughput of recovery boilers equipped with at least two levels of injection of air, the methods improving the thermal efficiency of the boiler with oxygen enrichment of the air in at least one level of the combustion air system... | 11/30/1999 |
| 5961781 | Process for recovering heat energy by condensation of vapor and dilution of sodium hydroxide using a condensing heat exchanger scrubbing system A process of improving the heat efficiency by condensation of vapor in concentrated chemical solutions, according to which vapor and a concentrated chemical solution are introduced into an absorber comprising a cooler/condenser. In accordance with the inv... | 10/05/1999 |
| 5948373 | Free radical oxidation installation for treating liquid effluents contaminated by organic substances In the installation for decontaminating a liquid effluent contaminated by at least one organic substance, a gaseous combustible is burned in a reactor to produce a flame containing hydroxyl free radicals OH° and oxygen O2 and that flame is cen... | 09/07/1999 |
| 5932067 | Method and apparatus for processing a fibrous mass in a spiral shaped flow-typed tube cell The invention is directed towards the method of processing of fibrous mass by a chemical agent and the set up needed for the conducting of the process. Fibrous mass is mixed with a gas transfer agent in the mixing cell and goes to the flow-type tube cell ... | 08/03/1999 |
| 5900112 | Method of reducing the viscosity of a black liquor using thiocyanate salt A method of recycling sodium-based salts used for digesting wood in a digester during the manufacture of pulp and paper. The method comprises collecting a black liquor from the digester, concentrating the black liquor, and adding a salt to the black liquo... | 05/04/1999 |
| 5855736 | Method of reducing corrosion in a power boiler of a pulp mill Method of reducing corrosion in a power boiler of a pulp mill using biofuel and suspended matter obtained from the waste water treatment of the mill. In the method flue gases obtained from a waste heat boiler are fed into the power boiler, causing the sul... | 01/05/1999 |
| 5820830 | Waste recovery and utilization in the kraft recovery process An integrated flue gas treatment and condensing heat exchanger is used to scrub sulfur dioxide from the flue gas produced by a power boiler used in a paper mill operating a kraft process. Sensible and latent heat from the flue gas is recovered and the con... | 10/13/1998 |
| 5820729 | Device and process for dissolving smelt from recovery boilers The invention relates to a device for dissolving smelt chemicals from recovery boilers, a so-called soda smelt dissolver, and to a process for such dissolution using the device. The device is characterized in that it consists of at least two separate diss... | 10/13/1998 |
| 5752994 | Black liquor gasifier A system and method for producing product gas using residual waste liquor is described with a gasifier reactor having a fluidized bed located therein. The gasifier reactor is heated to a predetermined temperature range with either an external heater or a ... | 05/19/1998 |
| 5735331 | Method and apparatus for regulating the temperature in a chemical melt dissolving tank A method of regulating the temperature in a chemical melt dissolving tank, where chemical melt produced in combustion of spent liquor of a cellulose pulp mill is dissolved in liquid, producing green liquor, provides excellent heat economy, while minimizin... | 04/07/1998 |
| 5658540 | High-tech computerized containment and treatment apparatus and process for combustion off-gas An integrated, at least substantially self-contained and at least substantially closed-loop combustion process and system for the control of gaseous, ionic, colloidal, liquid or particulate matter, particularly noxious contaminants contained in the off-ga... | 08/19/1997 |
| 5635152 | Acid regeneration Regeneration of hydrochloric acid by hydrolysis of iron chloride in aqueous solution employs a Pelletiser (5) after preconcentration of acid solution in a "Pre-Evaporator" (1). Pelletiser (5) controls pellet mixture to between 12% and 14% free water by re... | 06/03/1997 |
| 5624470 | Black liquor gasification with integrated warm-up and purge A kraft black liquor gasification system is provided with a hot flue gas generator which serves both as a means for generating a hot flue gas to warm-up the gasifier in preparation for start-up and as a means for generating an inert purge gas to purge the... | 04/29/1997 |
| 5591308 | Wood pulp reactor An oxygen delignification method and apparatus in which a charge of heated wood pulp is reacted with oxygen in the presence of a charge of caustic soda in a plurality of reaction stages located between mixing stages in which caustic is mixed with the wood... | 01/07/1997 |
| 5556602 | Device in a reactor for gasifying spent liquor This invention relates to a device for thermal decomposition of stock, especially a spent liquor obtained from pulp manufacture, where the gas stream formed in this connection passes through a liquid bath. The decomposition device has a reactor with a cha... | 09/17/1996 |
| 5545292 | Kraft smelt solidification in a fluidized bed reactor An improved black liquor recovery system for use in a kraft pulping mill is provided. Molten kraft smelt from a black liquor recovery boiler or recovery system is fed into a fluidized bed reactor where it is cooled and solidified to form solid kraft smelt... | 08/13/1996 |
| 5455011 | System and method for heating and gasification of residual waste liquor A system for providing heated fluidized bed gasification of a residual waste liquor provides a bed of granular material and a source of liquor provided to the material bed. An injector is situated in the material bed and communicates with an air source, a... | 10/03/1995 |
| 5439556 | Oxidation of white liquor using a packing column A method of producing oxidized white liquor from white liquor in which sodium sulfide is oxidized to sodium sulfate. In accordance with the method, an oxygen containing gas is contacted with the white liquor at a temperature of at least 110° C. and such ... | 08/08/1995 |
| 5425850 | CFB black liquor gasification system operating at low pressures A black liquor gasification system intended for use as a replacement for a Tomlinson cycle, Chemical Recovery Unit, and which operates at a temperature below the ash melting temperature thereby removing the potential for smelt-water reactions and explosio... | 06/20/1995 |
| 5407455 | Reactor for gasification of cellulose-waste liquors especially black liquor A reactor for gasification of cellulose-waste liquors, especially black liquor. The reactor includes a reactor cladding a supply for liquor and combustion air in the upper part of the reactor, an outlet opening for gases and other material in the lower pa... | 04/18/1995 |
| 5382322 | Selective white liquor oxidation A method for white liquor oxidation in a kraft mill utilizes a two-stage selective oxidation system in which the first stage is operated to remove sulfide while the second stage is operated to oxidize a significant fraction of the remaining oxidizable sul... | 01/17/1995 |
| 5368731 | Vacuum assisted slaker classifier The grit conveyance system of a classifier having a wash region above the liquid layer is provided with a vacuum means in the wash region for positive removal of liquids through a metal screen for disposal.... | 11/29/1994 |
| 5351631 | Removable damper for chemical recovery furnace Damper apparatus for air ports of a chemical recovery furnace is mounted on a removable windbox faceplate. Damper blades extend from cantilevered arms pivoted at the forward side of the faceplate, with the damper blades being otherwise unsupported, i.e., ... | 10/04/1994 |
| 5307745 | Removable damper for chemical recovery furnace Damper apparatus for air ports of a chemical recovery furnace is mounted on a removable windbox faceplate. Damper blades extend from a cantilevered arm pivoted at the forward side of the faceplate, with the damper blades being otherwise unsupported, i.e.,... | 05/03/1994 |
| 5204069 | Recovery boiler smelt shattering spray Nozzles for directing a jet of steam against a spout flow stream of sodium recovery boiler smelt are secured to an articulating anchor mount for the purpose of maximizing the shattering impact of the steam jet upon the smelt flow stream under a wide range... | 04/20/1993 |
| 5171405 | Reactor having a discontinuous conduit means between surfaces of a downwardly extending stationary spiral Organic constituents in a liquid, such as a waste water from a municipal or industrial process (e.g. bleach plant extraction liquor from the bleaching of paper pulp) may proceed effectively without the addition of alkali. When the organic constituents are... | 12/15/1992 |
| 5143702 | Two stage white liquor oxidation apparatus Apparatus (10) for the two stage oxidation of white liquor. The reaction vessel includes a central first stage chamber (24) and a second stage annular outer chamber (26). Heated air is first introduced through the outer second stage chamber (26) by pipes ... | 09/01/1992 |
