Distillation: processes – separatory – Distilling to separate or remove only water – From organic compound
Reexamination Certificate
2000-11-27
2008-08-12
Manoharan, Virginia (Department: 1797)
Distillation: processes, separatory
Distilling to separate or remove only water
From organic compound
C159S049000, C159SDIG016, C203S015000, C203S072000, C203S078000, C562S580000
Reexamination Certificate
active
07410556
ABSTRACT:
The invention relates to a method and a device for the purification of an aqueous solution of an organic acid having a boiling point at atmospheric pressure of less than 450° C., which further has approximately 275 g carboxylate ions/1 or less, preferably 250 g carboxylate ions/1 or less, and preferably less than 1% by weight ionic impurities, calculated on the basis of the total solution. In particular, the invention relates to a method and a device for the continuous purification and concentration, on an industrial scale, of an aqueous solution of an organic acid having a boiling point at atmospheric pressure of less than 450° C. According to the method, this solution is subjected to two or more distillation steps, the first distillation step being carried out at a temperature of from 80° to 150° C. and a pressure of from 50 to 250 mbar, and the second distillation step being carried out at a temperature of from 80° to 200° C. and a pressure of from 0.01 to 50 mbar.
REFERENCES:
patent: 1594843 (1926-08-01), Lawrie
patent: 3721610 (1973-03-01), Chaintron
patent: 4219389 (1980-08-01), Biola et al.
patent: 4601790 (1986-07-01), Stage
patent: 4867849 (1989-09-01), Cova et al.
patent: 5370774 (1994-12-01), Kuenstle et al.
patent: 5660691 (1997-08-01), Barnicki et al.
patent: 5750007 (1998-05-01), Clode et al.
patent: 5750732 (1998-05-01), Verser et al.
patent: 6048441 (2000-04-01), Auer et al.
patent: 6326458 (2001-12-01), Gruber et al.
patent: 6489508 (2002-12-01), Van Gansbeghe et al.
patent: 6509179 (2003-01-01), Veldhuis-Stribos et al.
patent: 6630603 (2003-10-01), Van Breugel et al.
patent: 6706898 (2004-03-01), Sumner, Jr.
patent: 6982026 (2006-01-01), Cockrem et al.
patent: 1 008 099 (1996-01-01), None
patent: WO 98 55442 (1998-12-01), None
International Search Report for PCT/NL 00/00865, dated Apr. 27, 2001.
Breugel Jan Van
Camprubi Vila Margarita
Vidal Lancis Jose Maria
Winkelaar Hendrik Martinus
Foley & Lardner LLP
Manoharan Virginia
Purac Biochem B.V.
Talapatra Sunit
Villacorta Gilberto M.
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