Distillation: processes – separatory – Addition of material to distilland to inhibit or prevent... – For inhibiting or preventing a polymerization reaction
Reexamination Certificate
2006-04-18
2006-04-18
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
Addition of material to distilland to inhibit or prevent...
For inhibiting or preventing a polymerization reaction
C203S001000, C203S049000, C203S091000, C562S600000
Reexamination Certificate
active
07029556
ABSTRACT:
The invention concerns a method of purifying a (meth) acrylic monomer selected among (meth) acrylic acids and their esters, by distillation in the presence of at least a polymerisation inhibitor requiring input of oxygen and/or an inhibitor having better efficacy in the presence of oxygen for stabilizing the liquid phase. The invention is characterized in that the distillation is performed in the presence of a NO2gas, with an oxygen/organic vapor (p/p) ratio ranging between 0.02 and 3%, and with a NO2condensed organic vapor (p/p) ratio ranging between 0.01 and 50 ppm.
REFERENCES:
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patent: 1 087 186 (1955-02-01), None
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patent: 50-101313 (1975-08-01), None
patent: 63027457 (1988-02-01), None
patent: 02-248402 (1990-10-01), None
patent: WO 96/06066 (1996-02-01), None
patent: 96/16921 (1996-06-01), None
Translation of DE 197 20 767 A1.
Patent Abstract of Japan, Publication No. 02-248402, Date of Publication Oct. 4, 1990, Application No. 01-069884, filed Mar. 22, 1989—“Agent And Method For Inhibiting Polymerization Of Acrylic Ester”, Aoki Tadamichi et al.
Reference 1—Japanese patent laid-open No. 50-101313 (published Aug. 11, 1975), Application No. 49-7062 (filed Jan. 16, 1974), NIPPON SHOKUBAI Industrial Co., Ltd., Process For Preventing Polymerization Of Acrylic Acid Or Methacrylate.
Fauconet Michel
Lepizzera Stephane
Arkema
Manoharan Virginia
Millen White Zelano & Branigan P.C.
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