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1. (WO1991008038) METHOD AND APPARATUS FOR EFFECTING GAS-LIQUID CONTACT
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/008038 International Application No.: PCT/CA1990/000431
Publication Date: 13.06.1991 International Filing Date: 04.12.1990
Chapter 2 Demand Filed: 03.07.1991
IPC:
A62D 3/00 (2007.01) ,B01D 21/00 (2006.01) ,B01D 53/18 (2006.01) ,B01D 53/52 (2006.01) ,B01D 53/78 (2006.01) ,B01F 3/04 (2006.01) ,B01F 7/00 (2006.01) ,B03D 1/02 (2006.01) ,B03D 1/16 (2006.01) ,C01B 17/05 (2006.01) ,C02F 1/78 (2006.01)
A HUMAN NECESSITIES
62
LIFE-SAVING; FIRE-FIGHTING
D
CHEMICAL MEANS FOR EXTINGUISHING FIRES; PROCESSES FOR MAKING HARMFUL CHEMICAL SUBSTANCES HARMLESS, OR LESS HARMFUL, BY EFFECTING A CHEMICAL CHANGE; COMPOSITION OF MATERIALS FOR COVERINGS OR CLOTHING FOR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; COMPOSITION OF MATERIALS FOR TRANSPARENT PARTS OF GAS-MASKS, RESPIRATORS, BREATHING BAGS OR HELMETS; COMPOSITION OF CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
3
Processes for making harmful chemical substances harmless, or less harmful, by effecting a chemical change in the substances
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
21
Separation of suspended solid particles from liquids by sedimentation
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
53
Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
14
by absorption
18
Absorbing units; Liquid distributors therefor
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
53
Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
34
Chemical or biological purification of waste gases
46
Removing components of defined structure
48
Sulfur compounds
52
Hydrogen sulfide
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
53
Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
34
Chemical or biological purification of waste gases
74
General processes for purification of waste gases; Apparatus or devices specially adapted therefor
77
Liquid phase processes
78
with gas-liquid contact
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
F
MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
3
Mixing, e.g. dispersing, emulsifying, according to the phases to be mixed
04
gases or vapours with liquids
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
F
MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
7
Mixers with rotary stirring devices in fixed receptacles; Kneaders
B PERFORMING OPERATIONS; TRANSPORTING
03
SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
D
FLOTATION; DIFFERENTIAL SEDIMENTATION
1
Flotation
02
Froth-flotation processes
B PERFORMING OPERATIONS; TRANSPORTING
03
SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
D
FLOTATION; DIFFERENTIAL SEDIMENTATION
1
Flotation
14
Flotation machines
16
with impellers; Subaeration machines
C CHEMISTRY; METALLURGY
01
INORGANIC CHEMISTRY
B
NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
17
Sulfur; Compounds thereof
02
Preparation of sulfur; Purification
04
from gaseous sulfur compounds including gaseous sulfides
05
by wet processes
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
72
by oxidation
78
with ozone
Applicants:
THE UNIVERSITY OF TORONTO INNOVATIONS FOUNDATION [CA/CA]; 203 College Street Toronto, Ontario M5T 1P9, CA (AllExceptUS)
SMITH, James, W. [CA/CA]; CA (UsOnly)
ELLENOR, David, Todd, Richard [CA/CA]; CA (UsOnly)
HARBINSON, John, N. [CA/CA]; CA (UsOnly)
Inventors:
SMITH, James, W.; CA
ELLENOR, David, Todd, Richard; CA
HARBINSON, John, N.; CA
Agent:
STEWART, Michael, I.; Sim & McBurney 330 University Avenue Suite 701 Toronto, Ontario M5G 1R7, CA
Priority Data:
2,004,65205.12.1989CA
582,42314.09.1990US
9002462.105.02.1990GB
Title (EN) METHOD AND APPARATUS FOR EFFECTING GAS-LIQUID CONTACT
(FR) PROCED ET APPAREIL DESTINE A EFFECTUER LE CONTACT LIQUIDE-GAZ
Abstract:
(EN) Components, usually but not exclusively gaseous components, are removed in a liquid medium from gas streams and chemically converted into an insoluble phase or physically removed. Specifically, hydrogen sulfide may be removed from gas streams by oxidation in aqueous chelated transition metal solution in a modified agitated flotation cell. A gas-liquid contact apparatus, generally a combined chemical reactor and solid product separation device, comprising such modified agitated flotation cell also is described. In order to effect efficient mass transfer and rapid reaction, gas bubbles containing hydrogen sulfide and oxygen are formed by rotating an impeller at a blade tip velocity of at least about 350 in/sec. to achieve the required shear. To assist in the reaction, a surrounding shroud has a plurality of openings, generally of aspect ratio of approximately 1, of equal diameter and arranged in uniform pattern, such as to provide a gas flow therethrough less than about 0.02 lb/min/opening in the shroud. In general, the gas velocity index is at least about 18 per second per opening, preferably at least about 24 per second per opening. Each of the openings has an area corresponding to an equivalent diameter less than about one inch.
(FR) Des composants, généralement mais pas exclusivement gazeux, sont ôtés de flux de gaz dans un milieu liquide et convertis chimiquement en une phase insoluble ou physiquement supprimés. Spécifiquement, on peut supprimer du sulfure d'hydrogène de courants gazeux par oxydation dans une solution aqueuse de chélate de métal transitoire se trouvant dans une cellule de flottation agitée modifiée. On décrit également un appareil de contact liquide-gaz, associant généralement un réacteur chimique et un dispositif de séparation de produits solides, et comprenant une cellule de flottation agitée modifiée de ce type. Afin d'effectuer un transfert de matière efficace et une réaction rapide, des bulles de gaz contenant du sulfure d'hydrogène et de l'oxygène sont formées par rotation d'un agitateur à une vitesse à l'extrémité des palettes d'environ 350 pouces/sec afin d'obtenir le cisaillement requis. Pour aider cette réaction, une enveloppe circulaire comporte une pluralité d'ouvertures, ayant généralement un allongement de 1 environ, de diamètre égal et disposées suivant une configuration uniforme de manière à fournir à travers lesdites ouvertures un flux de gaz inférieur à environ 0,02 livre/min/ouverture dans l'enveloppe. En général, l'indice de vitesse du gaz est au moins environ 18 par seconde et par ouverture, mais il est préférable qu'il soit au moins d'environ 24 par seconde et par ouverture. Chacune des ouvertures a une sperficie correspondant à un diamètre inférieur à un pouce environ.
Designated States: AU, BR, CA, FI, HU, JP, KR, NO, SU, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
FI922597NO19922210EP0504203JPH05500632CA2070630KR1019920703181
AU1991078954