GB2094167A - Agitators - Google Patents

Agitators Download PDF

Info

Publication number
GB2094167A
GB2094167A GB8200558A GB8200558A GB2094167A GB 2094167 A GB2094167 A GB 2094167A GB 8200558 A GB8200558 A GB 8200558A GB 8200558 A GB8200558 A GB 8200558A GB 2094167 A GB2094167 A GB 2094167A
Authority
GB
United Kingdom
Prior art keywords
core
sleeve
ptfe
agitator
process vessel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8200558A
Other versions
GB2094167B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Glaxo Group Ltd
Original Assignee
Glaxo Group Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Glaxo Group Ltd filed Critical Glaxo Group Ltd
Priority to GB8200558A priority Critical patent/GB2094167B/en
Publication of GB2094167A publication Critical patent/GB2094167A/en
Application granted granted Critical
Publication of GB2094167B publication Critical patent/GB2094167B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • B01F27/052—Stirrers with replaceable wearing elements; Wearing elements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1126—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades the stirrer being a bent rod supported at one end only

Abstract

An agitator for use in having a corrosive viscous liquid or slurry in a chemical process vessel comprises a core 2 of bendable metal which is a push fit in a preformed, non-porous sleeve 3 of PTFE. After the core 2 has been fitted in the sleeve, the core and its covering can be deformed to any desired shape. One end 4 of the sleeve is closed to prevent corrosive liquid or slurry entering between the core and the sleeve. The other end is sealed to the core at a shoulder 5. <IMAGE>

Description

SPECIFICATION Process vessel This invention relates to agitators for use in chemical process vessels.
It has been found that polytetrafluoroethylene (PTFE) is a very suitable material for use in the construction of agitators in chemical process vessels intended to be immersed in certain corrosive liquids, but it suffers from the disadvantage that its inherent lack of rigidity makes it unsuitable for use in viscous liquids or slurries.
An object of the present invention is to provide a way of overcoming this disadvantage.
According to the present invention, an agitator for a chemical process vessel comprises a core of rigid deformable material enclosed in a preformed sleeve of PTFE, the said sleeve being closed at one end and sealed to the core at the other end. At least a portion of the core is preferably, but not essentially, of deformable steel tubing.
It has been found that it is not possible to produce a satisfactory agitator by coating a steel tube or bar with PTFE. This is because such a PTFE coating is porous so that the core will become corroded in some liquids. The peformed PTFE sleeve used in the present invention is not porous and is preferaly a push-on fit on the core. After the sleeve has been fitted to the core, the core can be deformed to any desired shape.
An embodiment of the invention is illustrated the accompanying schematic drawing.
In the embodiment of the invention illustrated in the drawing, a chemical process vessel 1 contains a rotatable agitator which comprises a core 2 composed of a single piece of steel tube. A preformed sleeve 3 of PTFE is a push-on fit on the core 2. The sleeve is such that corrosive liquids will not penetrate the core. As shown in the drawing, one end portion of the core 2, not intended to be placed in the process vessel, is not covered by the sleeve. This uncovered end portion can be fitted in a chuck or the like to enable the agitator to be rotated. The other end 4 of the sleeve 3 is closed for example by a plug cap or the preformed sleeve can be produced with a closed end.
After the sleeve 3 has been fitted on the core 2, the core can be bent to a desird shape such as the shape shown in the drawing. One end of the sleeve is sealed to the core 2 so that there is no chance of corrosive liquid entering between the sleeve and the core, the core being preferably provided with a shoulder 5 at the sealed end.
If desired, the core may be composed of deformable steel tube with a rigid member conveniently a metal bar, projecting from an end of the tube. The tube is enclosed in the PTFE sleeve and the projecting rigid member forms an uncovered end portion engageable in a chuck, or the like.
It is not essential that the core 2 be of steel tubing as it could be provided by a deformable steel bar.
In another embodiment, the core may be first given a desired shape after which it is enclosed in a sleeve of PTFE as hereinbefore described.
An agitator constructed in accordance with this invention is suitable for use with slurries or viscous liquids as it will have sufficient rigidity to prevent it being deformed to any appreciable extent on rotation in the slurry or liquid.
1. An agitator for a chemical process vessel comprising a core of a rigid deformable material enclosed in a preformed sleeve of PTFE, the said sleeve being closed at one end and being sealed to the core at the other end.
2. An agitator as claimed in claim 1, wherein the core is deformable steel tube.
3. An agitator as claimed in either of claims 1 or 2 wherein the core is first enclosed in the preformed sleeve, after which the core and sleeve are bent to a desired shape.
4. An agitator for a chemcial process vessel substantially as described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Process vessel This invention relates to agitators for use in chemical process vessels. It has been found that polytetrafluoroethylene (PTFE) is a very suitable material for use in the construction of agitators in chemical process vessels intended to be immersed in certain corrosive liquids, but it suffers from the disadvantage that its inherent lack of rigidity makes it unsuitable for use in viscous liquids or slurries. An object of the present invention is to provide a way of overcoming this disadvantage. According to the present invention, an agitator for a chemical process vessel comprises a core of rigid deformable material enclosed in a preformed sleeve of PTFE, the said sleeve being closed at one end and sealed to the core at the other end. At least a portion of the core is preferably, but not essentially, of deformable steel tubing. It has been found that it is not possible to produce a satisfactory agitator by coating a steel tube or bar with PTFE. This is because such a PTFE coating is porous so that the core will become corroded in some liquids. The peformed PTFE sleeve used in the present invention is not porous and is preferaly a push-on fit on the core. After the sleeve has been fitted to the core, the core can be deformed to any desired shape. An embodiment of the invention is illustrated the accompanying schematic drawing. In the embodiment of the invention illustrated in the drawing, a chemical process vessel 1 contains a rotatable agitator which comprises a core 2 composed of a single piece of steel tube. A preformed sleeve 3 of PTFE is a push-on fit on the core 2. The sleeve is such that corrosive liquids will not penetrate the core. As shown in the drawing, one end portion of the core 2, not intended to be placed in the process vessel, is not covered by the sleeve. This uncovered end portion can be fitted in a chuck or the like to enable the agitator to be rotated. The other end 4 of the sleeve 3 is closed for example by a plug cap or the preformed sleeve can be produced with a closed end. After the sleeve 3 has been fitted on the core 2, the core can be bent to a desird shape such as the shape shown in the drawing. One end of the sleeve is sealed to the core 2 so that there is no chance of corrosive liquid entering between the sleeve and the core, the core being preferably provided with a shoulder 5 at the sealed end. If desired, the core may be composed of deformable steel tube with a rigid member conveniently a metal bar, projecting from an end of the tube. The tube is enclosed in the PTFE sleeve and the projecting rigid member forms an uncovered end portion engageable in a chuck, or the like. It is not essential that the core 2 be of steel tubing as it could be provided by a deformable steel bar. In another embodiment, the core may be first given a desired shape after which it is enclosed in a sleeve of PTFE as hereinbefore described. An agitator constructed in accordance with this invention is suitable for use with slurries or viscous liquids as it will have sufficient rigidity to prevent it being deformed to any appreciable extent on rotation in the slurry or liquid. CLAIMS
1. An agitator for a chemical process vessel comprising a core of a rigid deformable material enclosed in a preformed sleeve of PTFE, the said sleeve being closed at one end and being sealed to the core at the other end.
2. An agitator as claimed in claim 1, wherein the core is deformable steel tube.
3. An agitator as claimed in either of claims 1 or 2 wherein the core is first enclosed in the preformed sleeve, after which the core and sleeve are bent to a desired shape.
4. An agitator for a chemcial process vessel substantially as described with reference to the accompanying drawings.
GB8200558A 1981-01-08 1982-01-08 Agitators Expired GB2094167B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8200558A GB2094167B (en) 1981-01-08 1982-01-08 Agitators

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8100474 1981-01-08
GB8200558A GB2094167B (en) 1981-01-08 1982-01-08 Agitators

Publications (2)

Publication Number Publication Date
GB2094167A true GB2094167A (en) 1982-09-15
GB2094167B GB2094167B (en) 1985-04-11

Family

ID=26278046

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8200558A Expired GB2094167B (en) 1981-01-08 1982-01-08 Agitators

Country Status (1)

Country Link
GB (1) GB2094167B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6863430B2 (en) * 2002-04-24 2005-03-08 George A. Berube Mixing rod
EP1565256A1 (en) * 2002-09-13 2005-08-24 Glaxo Group Limited Coated blending system
US7303329B1 (en) * 2006-10-20 2007-12-04 Flynn Kevin B Mixing rod with U-shaped member

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6863430B2 (en) * 2002-04-24 2005-03-08 George A. Berube Mixing rod
EP1565256A1 (en) * 2002-09-13 2005-08-24 Glaxo Group Limited Coated blending system
EP1565256A4 (en) * 2002-09-13 2008-05-07 Glaxo Group Ltd Coated blending system
US7303329B1 (en) * 2006-10-20 2007-12-04 Flynn Kevin B Mixing rod with U-shaped member

Also Published As

Publication number Publication date
GB2094167B (en) 1985-04-11

Similar Documents

Publication Publication Date Title
US4318547A (en) Devices used for the connection of pipes
US4758340A (en) Sealing device for a chromatography column
JPS57130538A (en) Apparatus for preventing leakage at kneader or the like
CA2006590A1 (en) Gas-liquid mixer
EP0189391A3 (en) Blood sample tube
GB1254868A (en) Improvements in pressure vessels
TW358039B (en) Mixer tube for low viscosity fluids and use thereof
DE59103905D1 (en) Flameproof cans and method of making the same.
US4302314A (en) Voltammetric cell, measuring electrode and method
DE3460051D1 (en) Rain and spray water tight pressure equalising device, particularly for transport containers
GB2094167A (en) Agitators
GB2180816B (en) Closure construction having back-up support means
IT8105128A0 (en) MIXER AND AGITATOR FOR TANKS USED FOR THE STORAGE OF MORE OR LESS DENSE LIQUIDS SUCH AS MUST, WINES, JUICE, THICKENED AND CONCENTRATED.
US4599173A (en) Cleaning fluid vessel for immersion of cartridge-type filter media
GB2021513A (en) Improved Packaging Assembly
CH381200A (en) Reaction vessel equipped with a stirrer
GB2117658A (en) Stirring in closed vessels
CN214242046U (en) 20L coating prevents wasting bung
TW347348B (en) Mixing apparatus for liquids
EP0736318A2 (en) Liquid filtration device
EP0214764A3 (en) Method and apparatus for ion exchange applications
US3097002A (en) Mixing paddle
GB2261956A (en) Corrosion monitor
DE59302606D1 (en) Enamelled tubular fitting
KR890010474A (en) Tube fixtures through the wall

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19980108