Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2007-11-27
2007-11-27
Witherspoon, Sikarl A. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S913000, C568S918000
Reexamination Certificate
active
10451469
ABSTRACT:
Process for removing methanol from formaldehyde-containing solutions. The present invention relates to a process for removing methanol from formaldehyde-containing solutions, with methanol being converted into formaldehyde dimethyl acetal by reactive distillation in the presence of an acidic fixed-bed catalyst, and the resultant mixture comprising methanol, formaldehyde dimethyl acetal and possibly other impurities being distilled off.
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Kolah, Aspi K., et al, “Acetalization of Formaldehyde with Methanol in Batch and Continuous Reactive Distillation Columns,” Chemical Abs. 125:19905h, XP-002189207, (Oct. 14, 1996) & Ind. Eng. Chem. Res. (1996), 25(10), 3707-3720.
Zhou, Wei, et al, “Application of catalytic distillation in the synthesis of methylal,” Chemical Abs. 132:13270g, XP-002189208, (Jan. 10, 2000) & Gongye Cuihua (1998), 6(1), 35-39.
Göring Matthias
Hoffmockel Michael
Lingnau Juergen
Mück Karl-Friedrich
Connolly Bove & Lodge & Hutz LLP
Ticona GmbH
Witherspoon Sikarl A.
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