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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 |
| 7252693 | Carbon monoxide conversion process and reactor A process and reaction unit for isothermal shift conversion of a carbon monoxide containing feed gas. The process comprises the steps of introducing the feed gas in a reaction unit into reactor tubes with a fixed bed of a shift conversion catalyst in a reaction zone... | 08/07/2007 |
| 7112262 | Device for downward flow evaporation of a liquid substance and subsequent condensation of the vapour formed A device is disclosed for downward flow evaporation of a liquid substance and subsequent condensation of the vapor formed, which includes a plurality of vertical evaporator tubes housed in a common casing in side-by-side relationship, a distributor tank which is arr... | 09/26/2006 |
| 7065967 | Process and apparatus for boiling and vaporizing multi-component fluids A new boiler or heat transfer apparatus is disclosed for use with multi-component working fluids which includes a vapor removal apparatus designed to maintain a substantial compositional identity between the boiling liquid and its vapor along a length of the apparat... | 06/27/2006 |
| 6998026 | Method for producing tertiary C-C-alkyl esters of (meth)acrylic acid A tert-C4–C8-alkyl (meth)acrylate is prepared by reacting (meth)acrylic acid with an olefin of the formula where R1 and R2, which may be i... | 02/14/2006 |
| 6935051 | Heating and drying apparatus for particulate material A continuous gravity flow apparatus for heating and/or drying of particulate material is vertically disposed and is provided with an inlet at the top and an outlet at the bottom. The apparatus includes a flow passage for the particulate material which is defined bet... | 08/30/2005 |
| 6883596 | Heat exchanger A heater exchanger used to condense a refrigerant in a refrigeration system. The heat exchanger is designed to perform a heat exchanging operation by the use of latent heat of water vaporization, thus having improved heat exchanging efficiency as well as a reduced s... | 04/26/2005 |
| 6830099 | Falling film evaporator having an improved two-phase distribution system An improved two-phase refrigerant distributor for use in a falling film evaporator in a refrigeration chiller system defines apertures in its undersurface from which serrated collars depend. The serrations cooperate to define locations below the undersurface of the ... | 12/14/2004 |
| 6435484 | Absorber An absorber having a shell, wet tubes and cooling fluid supply and collection portions. Partition walls divide the shell into at least three zones. The wet tubes are disposed parallelly in the shell, passing through the partition walls. The opposite open ... | 08/20/2002 |
| 6354369 | Condensing and extraction apparatus Apparatus and method for condensing moisture from an air stream. The condensing comprises concentric cylinders having a common wall. The outer cylinder contains a cooling material, such as water, and upon contact therewith, the air stream is cooled and mo... | 03/12/2002 |
| 6089312 | Vertical falling film shell and tube heat exchanger The present invention provides a vertical falling film shell and tube heat exchanger, where the falling film is formed on the exterior surface of the tubes. A distribution plate is provided below an upper tubesheet, and a sparger plate having sparger hole... | 07/18/2000 |
| 6068730 | Liquid distributor for evaporator A liquid distributor for distributing liquid over the heat transfer surface of an evaporator includes a channel array including one or more supply channels and downwardly deviating distribution channels. Each distribution channel has a step-shaped expansi... | 05/30/2000 |
| 5983996 | Steam condenser A steam condenser has a perforated plate extending transversely in a housing, a pipe extending upwardly from an opening in the plate and having openings in its upper portion, at least one steam inlet, and a deflector adjacent to said inlet extending inwar... | 11/16/1999 |
| 5893410 | Falling film condensing heat exchanger with liquid film heat transfer The falling film condensing heat exchanger includes a plurality of vertical tubes carrying a coolant. A distribution plate is disposed at the upper end of the condenser shell and has a plurality of apertures receiving the tubes. The apertures in the distr... | 04/13/1999 |
| 5213154 | Liquid desiccant regeneration system A single-stage desiccant regeneration system for use in an air conditioning system, the regeneration system comprising a falling film heat exchanger for transferring heat from concentrated desiccant to dilute desiccant, a boiler for regenerating dilute de... | 05/25/1993 |
| 5195578 | Method of and an apparatus for trickling film heat exchange An apparatus for heat exchange between a fluid circulating in a tube of heat conductive material and a flow of liquid in a thin layer circulating by gravity in a channel of heat conductive material, in thermal contact with the tube and disposed in the man... | 03/23/1993 |
| 5076347 | Indirect evaporative cooler An indirect evaporative cooler having an improved heat exchanger. The heat exchanger includes a plurality of heat tubes arranged in a closely spaced vertically stagger matrix and with each tube having an internal fin mounted therein. The heat transfer tub... | 12/31/1991 |
| 5054547 | Vertical tube heat exchanger apparatus having resilient distributor devices and a resilient distributor device therefor A vertical tube heat exchanger having a shell enclosing a bottom tubesheet, a top tubesheet in parallel, spaced-apart relationship to the bottom tubesheet, and a plurality of spaced-apart parallel flow tubes extending between the top tubesheet and bottom ... | 10/08/1991 |
| 5004043 | Internal tubular falling film apparatus for the evaporation of liquids and for the absortion or degassing of solutions of two or more substances Apparatus (10) for the evaporation of liquids or for the absorption or degassing of two-substance or multi-substance solutions of the interior tube falling film type of construction, with a pressure tank (12) through which a heat exchanging medium can pas... | 04/02/1991 |
| 4932468 | Vertical falling film multi-tube heat exchanger A heat exchanger with a multiplicity of generally vertical heat transfer tubes has an improved liquid distribution arrangement in its upper inlet head. The liquid distribution arrangement includes a flow diverting baffle disposed within the inlet head abo... | 06/12/1990 |
| 4924936 | Multiple, parallel packed column vaporizer A multiple, parallel packed column vaporizer for vaporizing a chemical having a relatively low decomposition temperature includes a shell; a plurality of parallel, vertically oriented vaporization columns arranged in the shell, each vaporization column ha... | 05/15/1990 |
| 4848447 | Tube-type heat exchanger and liquid distributor head therefor A tube-type heat exchanger has the tube ends substantially flush with the upper tube sheet and liquid is distributed to the tubes through distributor heads which are sealed and therefore provide gas cushions absorbing volume changes in the tubes.... | 07/18/1989 |
| 4842049 | Heat exchanging apparatus for cooling and condensing by evaporation A heat exchange apparatus having a first header for receiving fluid from a source, flexible thin-walled tubular plastic heat exchange elements defining a plurality of passages through a heat exchange zone and second header means for receiving fluid from s... | 06/27/1989 |
| 4810327 | Falling film evaporator of the vertical-tube type In a falling film evaporator of the vertical-tube type in which liquid to be evaporated is supplied at the top on the outer surface of vertical heat exchanger tubes and the heat medium is supplied to the heat exchanger tubes at the bottom for flow inside ... | 03/07/1989 |
| 4799542 | Heat exchanger with thin-film evaporator A heat exchanger designed to cool a liquid such as water has a boiler with several upright heat-transfer tubes on whose inner surfaces the liquid descends in the form of a thin film while a refrigerant such as ammonia or a Freon rises within the boiler. T... | 01/24/1989 |
| 4704993 | Apparatus for producing power using concentrated brine A power plant includes a source of water, a heat exchanger having an evaporator side maintained below atmospheric pressure for converting the water to steam, and a turbine responsive to said steam for producing work and heat depleted steam. The heat excha... | 11/10/1987 |
| 4641706 | Vertical shell and tube heat exchanger with spacer or clip to form uniform thickness falling films on exterior surfaces of tubes A vertical shell and tube heat exchanger in which the tubes extend through oversized holes in a liquid distribution plate. Liquid flows through the holes and down each tube exterior surface as a falling film. A spacer or clip, desirably of wire, is placed... | 02/10/1987 |
| 4614229 | Method and apparatus for efficient recovery of heat from hot gases that tend to foul heat exchanger tubes A method, together with suitable apparatus therefor, is provided useful in recovering heat from a high temperature cracked hydrocarbon gas, in which a liquid wash is injected into the tubes of a vertically oriented multitube transfer line heat exchanger t... | 09/30/1986 |
| 4584064 | Device and installations for the distillation by thin layer evaporation particularly of hydrocarbons, and process for operating this device The present invention concerns a process for the thin layer evaporation of liquid in which the thin layer to be evaporated is formed by centrifugation. It is characterized in that the pointed part of the said cone is immersed in a reserve of liquid to be ... | 04/22/1986 |
| 4579171 | Shell and tube heat exchanger with welds joining the tubes to tube sheet A falling film heat exchanger in which a continuous weld circumferentially joins each tube to the outer surface of the upper, and desirably also the lower, tubesheet. The welds seal the crevices between the tubes and tubesheet holes and prevent corrosion.... | 04/01/1986 |
| 4572287 | Falling film heat exchanger with film forming members This invention relates to shell and tube vertical falling film heat exchangers. More particularly, this invention is concered with an improved heat exchanger which has an insert or cap on the upper ends of the tubes to direct the liquid against the inner ... | 02/25/1986 |
| 4567942 | Shell and tube falling film heat exchanger with tubes in concentric rings and liquid distribution box A falling film heat exchanger of the shell and tube type has the tubes positioned in concentric rings. A liquid distribution box is positioned above the tube upper ends. Short pipes extend downwardly from the box to feed liquid between the rings of tubes ... | 02/04/1986 |
| 4564064 | Falling film heat exchanger with member to distribute liquid on external surfaces of tubes A falling film heat exchanger having a plurality of tubes is provided with a liquid distribution member surrounding each tube which directs liquid against the tube external wall to control the falling film flow and to form uniform films on each tube. The ... | 01/14/1986 |
| 4532985 | Falling film heat exchanger Falling film heat exchanger includes circular areas for evenly distributing feed liquid and/or heat exchange liquid to the tube interior and/or exterior surfaces. The circular areas may be defined by a liquid porous material, slots in an O-ring or vertica... | 08/06/1985 |
| 4520866 | Falling film evaporation type heat exchanger A falling film evaporation type heat exchanger of the shell-tube type which includes an outer shell or main body portion and a plurality of individual heat transfer tubes disposed therein, with the heat transfer tubes extending substantially in a vertical... | 06/04/1985 |
| 4519448 | Falling film heat exchanger with member to distribute liquid on external surfaces of tubes A falling film heat exchanger having a plurality of tubes is provided with a liquid distribution member surrounding each tube which directs liquid against the tube external wall to control the falling film flow and to form uniform films on each tube. The ... | 05/28/1985 |
| 4317787 | Device for distributing a liquid in thin-film form in vertical heat-exchangers An improved device for the distribution of liquids in a vertical heat-exchange apparatus which has reeds mounted on the top ends of vertical tubes to spread a liquid in film form over the internal surface of each tube of the tube bundle. The reeds of the ... | 03/02/1982 |
| 4248296 | Fluid distributor for condenser tubes A fluid distributor for mounting in the upper end of a vertical condenser tube, comprising a ferrule having a downwardly opening cavity therein, the cavity including a lower frusto-conical portion and an upper spherical portion which is tangential to said... | 02/03/1981 |
| 4235281 | Condenser/evaporator heat exchange apparatus and method of utilizing the same A condenser/evaporator heat exchanger comprising a plurality of vertically oriented panel units spaced moderately from one another. Each panel unit comprises a pair of thin film plastic sheets bonded to one another along a plurality of vertically extendin... | 11/25/1980 |
| 4232734 | Trickler heat-exchange apparatus The upper end portion of an upright tubular wall whose inner side is contacted by material requiring to be cooled, is surrounded by an annular receptacle for cooling water. An annular baffle extends from the receptacle towards but not into contact with th... | 11/11/1980 |
| 4199537 | Liquid distributor for thin-film, tube-bundle apparatus A distributor of liquid is disclosed, to be used in chemical apparatus having a bundle of tubes in the interior of which the liquid to be treated is distributed in the form of a thin film flowing on the internal surfaces of the tubes, the improvement cons... | 04/22/1980 |
