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1. WO1996040592 - FORMIC ACID AND FORMALDEHYDE DESTRUCTION IN WASTE STREAMS

Publication Number WO/1996/040592
Publication Date 19.12.1996
International Application No. PCT/US1996/008308
International Filing Date 03.06.1996
Chapter 2 Demand Filed 07.01.1997
IPC
C02F 1/72 2006.01
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
72by oxidation
C07F 9/38 2006.01
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
FACYCLIC, CARBOCYCLIC, OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
9Compounds containing elements of Groups 5 or 15 of the Periodic System
02Phosphorus compounds
28with one or more P-C bonds
38Phosphonic acids ; Thiophosphonic acids
CPC
C02F 1/725
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
72by oxidation
725by catalytic oxidation
C07F 9/3813
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
FACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
9Compounds containing elements of Groups 5 or 15 of the Periodic System
02Phosphorus compounds
28with one or more P—C bonds
38Phosphonic acids RP(=O)(OH)2; Thiophosphonic acids ; , i.e. RP(=X)(XH)2 (X = S, Se)
3804not used, see subgroups
3808Acyclic saturated acids which can have further substituents on alkyl
3813N-Phosphonomethylglycine; Salts or complexes thereof
Y10S 210/908
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
210Liquid purification or separation
902Materials removed
908Organic
Applicants
  • MONSANTO COMPANY [US]/[US]
Inventors
  • SMITH, Lowell, R.
Agents
  • SZCZEPANSKI, Steven, Z.
  • SZCZEPANSKI, Steven, Z.
Priority Data
08/474,58307.06.1995US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FORMIC ACID AND FORMALDEHYDE DESTRUCTION IN WASTE STREAMS
(FR) ELIMINATION DE L'ACIDE FORMIQUE ET DU FORMALDEHYDE CONTENUS DANS LES FLUX DE DECHETS
Abstract
(EN)
A process is provided for destroying formic acid and/or formaldehyde in an aqueous, organic acid waste stream by contacting the stream with a supported precious metal catalyst and passing air or molecular oxygen gas through the solution to promote chemical oxidation. The invention is a safe, practical and cost effective alternative to bio-system treatment of these compounds using microorganisms. The process of the invention may be practiced in either a batch or continuous mode and, in accordance with the invention, formic acid present in a stream at a level of 3800 ppm and formaldehyde present in an amount of 5800 ppm can be reduced respectively to levels of 200 ppm or less.
(FR)
Le procédé décrit ci-dessous permet d'éliminer l'acide formique et/ou le formaldéhyde contenus dans un flux de déchets aqueux renfermant des acides organiques en mettant en contact avec le flux un catalyseur à base de métaux précieux et en faisant passer de l'air ou de l'oxygène moléculaire gazeux dans la solution afin de faciliter l'oxydation chimique de cette dernière. L'invention constitue une alternative au système de traitement biologique de ces composés faisant appel à des micro-organismes; elle est sûre, pratique et de coût inférieur. Le procédé peut être mis en oeuvre selon un mode discontinu ou continu et, conformément à l'invention,l'acide formique présent dans un flux de déchets à un taux de 3800 ppm et le formaldéhyde présent à un taux de 5800 ppm peuvent être ramenés à des taux de 200 ppm ou inférieurs.
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