Class 568/493 - Of formaldehyde per se

Subclass of Class 568 - Organic compounds -- part of the class 532-570 series
Definition: Processes of purifying or
No. of patents: 35
Last issue date: 06/24/2008

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Number	Title	Issue Date
7390932	Method for preparing highly concentrated, gaseous formaldehydes Process for preparing high-concentration gaseous formaldehyde having a molar CH2O:H2O ratio of ≧0.6 from an aqueous formaldehyde solution by evaporation of at least part of the solution, in which the aqueous formaldehyde solution is heated to...	06/24/2008
7345207	Production of high-concentration formaldehyde solutions Process for preparing high-concentration formaldehyde solutions having a CH2O content of ≧50% by weight from an aqueous formaldehyde solution having a lower CH2O content by evaporation of part of this solution (partial evaporation), in which ...	03/18/2008
7342139	Method for producing highly concentrated formaldehyde solution A process for preparing a high-concentration formaldehyde solution by removing water from a lower-concentration formaldehyde solution having a formaldehyde content of from 5 to 50% by weight, in which the lower-concentration formaldehyde solution is fed to a preheat...	03/11/2008
7338579	Dewatering process A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water, and methanol by distilling in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product contains substantially...	03/04/2008
7304187	Process for reducing the formaldehyde content of a gas There is provided a process for reducing formaldehyde content of a gas comprising the step of contacting the gas with an aqueous oxidizing solution comprising at least one cation, a base, and H2O2 so as to oxidize at least a part of the formald...	12/04/2007
7145043	Non-Hazardous oxidative neutralization of aldehydes Methods, compositions, and devices for alleviating the problems of toxic discharge of aldehydes present in waste streams are disclosed. The methods relate to forming neutralized aldehydes by treating aldehydes with oxidizing agents. The oxidizing agents offer a simp...	12/05/2006
7109382	Method for the production of formaldehyde A method for formaldehyde production through catalytic oxidation of methanol, comprising the steps of feeding to a first oxidation catalytic bed (2) a gas flow comprising methanol and oxygen at a predetermined crossing linear flow rate, obtaining at the outle...	09/19/2006
6822123	Formaldehyde process A process is provided for the production of formaldehyde from methyl chloride. In the process methyl chloride is oxidized with air over a catalyst to give formaldehyde and hydrogen chloride. In a preferred embodiment of the invention, a mixture of two different cata...	11/23/2004
6809224	Method for the separation of formaldehyde from a reaction mixture containing polyols by the addition of solvents before and/or during the distillation Formaldehyde is removed by distillation from reaction solutions containing a methlolated alkanal which was obtained from the reaction of formaldehyde with an alkanal which has at least one acidic hydrogen atom α to the carbonyl function or from the reaction of a 2-...	10/26/2004
6781019	Method for absorbing formaldehyde from gaseous mixtures that contain it A method for absorbing formaldehyde from gaseous mixtures that contain it, and a method for regenerating the absorption compound used. ...	08/24/2004
6683221	Production of formaldehyde from CH4 and H2S A method wherein a sour natural gas stream can be treated to produce primarily carbon monoxide from methane, and the carbon monoxide and hydrogensulfide are reacted to produce methyl mercaptans, (primarily methanethiol (CH3 SH) and a small amou...	01/27/2004
6531634	Non-hazardous oxidative neutralization of aldehydes Methods, compositions, and devices for alleviating the problems of toxic discharge of aldehydes present in waste streams are disclosed. The methods relate to forming neutralized aldehydes by treating aldehydes with oxidizing agents. The oxidizing agents o...	03/11/2003
6478929	Dewatering process A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water and methanol by distilling the solution in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product...	11/12/2002
6414196	Process and device for preparing pure formaldehyde A process for the post-purification in particular of pyrolysis gases for preparing pure formaldehyde, hemiformal being pyrolyzed in an evaporator, the resulting formaldehyde vapor being passed through a condensed liquid component collected in the bottom a...	07/02/2002
6414195	Method of producing formaldehyde directly from methane The present invention provides a method of using a silica-supported 12-molybdosilicic acid catalyst consisting of 12-moloybdosilicic acid supported on silica, in which 12-molybdosilicic acid is supported in an amount not smaller than 10 mass % on silica, ...	07/02/2002
6379507	Process for producing methylal A process for producing methylal that involves feeding a liquid containing methanol, formaldehyde and water to an uppermost reactor of at least four solid acid catalyst-filled reactors which are each externally connected to an intermediate portion of a di...	04/30/2002
6339175	Process for the non-oxidative preparation of formaldehyde from methanol In a process for preparing formaldehyde from methanol by dehydrogenation in a reactor in the presence of a catalyst at a temperature in the range from 300 to 1000° C., a carrier gas stream which has a temperature above the dehydrogenation temperature is ...	01/15/2002
6294701	Method of producing formaldehyde directly from methane The present invention provides a silica-supported 12-molybdosilicic acid catalyst comprising a silica carrier and at least 10% by weight, based on the silica amount, of 12-molybdosilicic acid supported on the carrier and a method of producing formaldehyde...	09/25/2001
6229053	Method for purification of formaldehyde, use thereof and plastics produced therewith Abstract A process for purifying formaldehyde in which the formaldehyde is scrubbed with alcohol in an absorption unit and in the course of this reacted virtually completely to form the hemiformal and is simultaneously separated off from gaseous impuritie...	05/08/2001
5969191	Production of formaldehyde from methyl mercaptans A method wherein a gas stream containing a methyl mercaptan is passed in contact with a catalyst comprising a supported metal oxide or a bulk metal oxide in the presence of an oxidizing agent and for a time sufficient to convert at least a portion of the ...	10/19/1999
4990685	Process for the preparation of aqueous formaldehyde solutions In a process for the preparation of aqueous formaldehyde solutions consisting of the following steps: (a) reaction of a methanol/water/air mixture in vapor form at elevated temperature over a catalyst, (b) absorption of the reaction mixture in one or more succ...	02/05/1991
4962235	Process for producing high purity formaldehyde A process for producing formaldehyde having high purity is disclosed, which comprises: (A) feeding crude formaldehyde containing water and methanol to the middle or lower part of a distillation column, and feeding a polyalkylene oxide compound which is in...	10/09/1990
4910344	Treatment of compositions containing water and organic oxygenates Aqueous compositions containing organic oxygenates such as methyl isobutyl ketone are treated by pervaporation through a polyvinyl alcohol/polyacrylic acid membrane to yield retentate containing increased concentration of oxygenate....	03/20/1990
4736062	Process for preparing methacrylic acid A process is disclosed for producing an alpha-, beta-ethylenically unsaturated monocarboxylic acid compound which comprises the aldol-type condensation of a saturated aliphatic monocarboxylic acid compound under vapor phase conditions in the presence of a...	04/05/1988
4691060	Process for recovering waste heat from formaldehyde product gas Waste heat possessed by a hot formaldehyde product gas obtained by catalytic reaction of methanol with air is heat exchanged with pressurized water in a waste heat boiler, thereby generating steam, and then leading the product gas to a formaldehyde absorp...	09/01/1987
4385188	Process for removing methanol from aqueous formaldehyde Aqueous formaldehyde solutions containing minor amounts of methanol are substantially stripped of methanol by a low energy process at relatively low temperature by means of recycled inert gas in a stripping column comprising at least about 1.5 theoretical...	05/24/1983
4383123	Manufacture of aqueous formaldehyde Formaldehyde manufacture by oxidative-dehydrogenation of methanol over a silver or copper catalyst. Aqueous formaldehyde solution is obtained from the reaction and is substantially stripped of methanol by a low energy process at relatively low temperature...	05/10/1983
4374814	Method for removal of gaseous formaldehyde from the atmosphere A method for purifying air by removing gaseous formaldehyde under ambient conditions, by bringing the air in contact with a solid shaped composition consisting essentially of one or more polyhydric water-soluble polymers and ambient moisture, in the absen...	02/22/1983
4348540	Manufacture of aqueous formaldehyde Formaldehyde manufacture by oxidative-dehydrogenation of methanol over a silver or copper catalyst. Aqueous formaldehyde solution is obtained from the reaction and is stripped of methanol and water by a low energy process at relatively low temperature by ...	09/07/1982
4285811	Purification of formaldehyde by separation A mixture containing formaldehyde and water is separated effectively by contacting with adsorbents of specific type A zeolites containing exchanged cations of the elements from Group IA (4) to (6) or Group IIA (6) or mixture thereof of the Periodic Table ...	08/25/1981
4124642	6,6,7-Trimethyl-tricyclo[5.2.2.0¹,5 ]undec-8-en-2-one Novel tricyclo-ketone derivatives useful as perfume ingredients and as intermediates for the preparation of (&#b1;) khusimone....	11/07/1978
4090999	Process for the production of urea-formaldehyde adhesives or resins and products obtained thereby This invention relates to a process in which solutions containing from 68 to 70% concentration of formaldehyde are prepared and directly reacted with urea to form urea-formaldehyde adhesives with a solids content of, for example, 65%, without any need for...	05/23/1978
4067805	Process for separating aqueous formaldehyde mixtures Process for the separation of water from mixtures of water and formaldehyde, by contacting the mixtures against an organic polymeric membrane, and withdrawing at the other side of the membrane a mixture having a higher concentration of water....	01/10/1978
4035291	Process for separating aqueous formaldehyde mixtures Process for the separation of water from mixtures of water and formaldehyde by contacting the mixtures against an organic polymeric membrane, and withdrawing at the other side of the membrane a mixture having a higher concentration of water....	07/12/1977
3950247	Separation procedure Process for the separation of water from mixtures of water and organic or inorganic compounds, soluble in water, by contacting the mixtures against an organic polymeric membrane, and withdrawing at the other side of the membrane a mixture having a higher ...	04/13/1976

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Class 568/493 - Of formaldehyde per se