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Class Information
Number: 568/493
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Oxygen containing (e.g., perchlorylbenzene, etc.) > Aldehydes > Acyclic > Processes > Purification or recovery > Of formaldehyde per se
Description: Processes of purifying or

Patents under this class:

Patent Number Title Of Patent Date Issued
7390932 Method for preparing highly concentrated, gaseous formaldehydes Jun. 24, 2008
7345207 Production of high-concentration formaldehyde solutions Mar. 18, 2008
7342139 Method for producing highly concentrated formaldehyde solution Mar. 11, 2008
7338579 Dewatering process Mar. 4, 2008
7304187 Process for reducing the formaldehyde content of a gas Dec. 4, 2007
7145043 Non-Hazardous oxidative neutralization of aldehydes Dec. 5, 2006
7109382 Method for the production of formaldehyde Sep. 19, 2006
6822123 Formaldehyde process Nov. 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 Oct. 26, 2004
6781019 Method for absorbing formaldehyde from gaseous mixtures that contain it Aug. 24, 2004
6683221 Production of formaldehyde from CH4 and H2S Jan. 27, 2004
6531634 Non-hazardous oxidative neutralization of aldehydes Mar. 11, 2003
6478929 Dewatering process Nov. 12, 2002
6414196 Process and device for preparing pure formaldehyde Jul. 2, 2002
6414195 Method of producing formaldehyde directly from methane Jul. 2, 2002
6379507 Process for producing methylal Apr. 30, 2002
6339175 Process for the non-oxidative preparation of formaldehyde from methanol Jan. 15, 2002
6294701 Method of producing formaldehyde directly from methane Sep. 25, 2001
6229053 Method for purification of formaldehyde, use thereof and plastics produced therewith May. 8, 2001
5969191 Production of formaldehyde from methyl mercaptans Oct. 19, 1999
4990685 Process for the preparation of aqueous formaldehyde solutions Feb. 5, 1991
4962235 Process for producing high purity formaldehyde Oct. 9, 1990
4910344 Treatment of compositions containing water and organic oxygenates Mar. 20, 1990
4736062 Process for preparing methacrylic acid Apr. 5, 1988
4691060 Process for recovering waste heat from formaldehyde product gas Sep. 1, 1987
4385188 Process for removing methanol from aqueous formaldehyde May. 24, 1983
4383123 Manufacture of aqueous formaldehyde May. 10, 1983
4374814 Method for removal of gaseous formaldehyde from the atmosphere Feb. 22, 1983
4348540 Manufacture of aqueous formaldehyde Sep. 7, 1982
4285811 Purification of formaldehyde by separation Aug. 25, 1981
4124642 6,6,7-Trimethyl-tricyclo[,5 ]undec-8-en-2-one Nov. 7, 1978
4090999 Process for the production of urea-formaldehyde adhesives or resins and products obtained thereby May. 23, 1978
4067805 Process for separating aqueous formaldehyde mixtures Jan. 10, 1978
4035291 Process for separating aqueous formaldehyde mixtures Jul. 12, 1977
3950247 Separation procedure Apr. 13, 1976

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