Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2005-11-01
2005-11-01
Dentz, Bernard (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C549S257000
Reexamination Certificate
active
06960670
ABSTRACT:
This invention discloses a method for producing maleic anhydride comprising an azeotropic distillation step to dehydrate a crude maleic acid-containing aqueous solution, which method is characterized by as an azeotropic solvent (1) using an organic solvent exhibiting a maximum dissolving concentration of the organic solvent in water in the range of 0.1-5% by weight at a temperature of 20° C. According to this invention, it is made possible to prevent the occurrence of a blocking substance, allow a continuous operation for a long time, and remove by-produced acid components by a process of distillation for azeotropic dehydration.
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Handbook of Chemistry & Physics (43rd Edition) Chemical Rubber Publ. Co., Cleveland, Ohio (1961) p. 944-945.
Hamamoto Kei
Ishii Yoshitake
Kajihara Tetsuya
Kawashima Tadayoshi
Yamada Souichi
Dentz Bernard
McCarter & English LLP
Nippon Shokubai Co. , Ltd.
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