WO1994025550A1 - Fluid treatment process - Google Patents
Fluid treatment process Download PDFInfo
- Publication number
- WO1994025550A1 WO1994025550A1 PCT/GB1994/000954 GB9400954W WO9425550A1 WO 1994025550 A1 WO1994025550 A1 WO 1994025550A1 GB 9400954 W GB9400954 W GB 9400954W WO 9425550 A1 WO9425550 A1 WO 9425550A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fluid
- process according
- treatment
- less
- phosphate
- Prior art date
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 25
- 239000003456 ion exchange resin Substances 0.000 claims abstract description 23
- 229920003303 ion-exchange polymer Polymers 0.000 claims abstract description 23
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 125000000129 anionic group Chemical group 0.000 claims abstract description 17
- 230000018044 dehydration Effects 0.000 claims abstract description 16
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 16
- 239000010452 phosphate Substances 0.000 claims abstract description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 12
- 230000015556 catabolic process Effects 0.000 claims abstract description 6
- 238000006731 degradation reaction Methods 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims abstract description 4
- 239000011347 resin Substances 0.000 claims description 39
- 229920005989 resin Polymers 0.000 claims description 39
- 235000021317 phosphate Nutrition 0.000 claims description 24
- -1 alkyl aryl phosphate Chemical compound 0.000 claims description 15
- 229920001429 chelating resin Polymers 0.000 claims description 11
- 150000002148 esters Chemical class 0.000 claims description 8
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 8
- 239000002480 mineral oil Substances 0.000 claims description 7
- 238000006386 neutralization reaction Methods 0.000 claims description 6
- 150000002989 phenols Chemical class 0.000 claims description 6
- 235000010446 mineral oil Nutrition 0.000 claims description 5
- 229920001467 poly(styrenesulfonates) Polymers 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- LIAWCKFOFPPVGF-UHFFFAOYSA-N 2-ethyladamantane Chemical compound C1C(C2)CC3CC1C(CC)C2C3 LIAWCKFOFPPVGF-UHFFFAOYSA-N 0.000 claims description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 claims description 2
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims description 2
- 229940100198 alkylating agent Drugs 0.000 claims description 2
- 239000002168 alkylating agent Substances 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000026731 phosphorylation Effects 0.000 claims description 2
- 238000006366 phosphorylation reaction Methods 0.000 claims description 2
- 125000005591 trimellitate group Chemical group 0.000 claims description 2
- KOWVWXQNQNCRRS-UHFFFAOYSA-N tris(2,4-dimethylphenyl) phosphate Chemical compound CC1=CC(C)=CC=C1OP(=O)(OC=1C(=CC(C)=CC=1)C)OC1=CC=C(C)C=C1C KOWVWXQNQNCRRS-UHFFFAOYSA-N 0.000 claims description 2
- SZQAOGPCUGHBPG-UHFFFAOYSA-N (2,4,6-trimethylphenyl) dihydrogen phosphate Chemical compound CC1=CC(C)=C(OP(O)(O)=O)C(C)=C1 SZQAOGPCUGHBPG-UHFFFAOYSA-N 0.000 claims 1
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 claims 1
- 229940116351 sebacate Drugs 0.000 claims 1
- CXMXRPHRNRROMY-UHFFFAOYSA-L sebacate(2-) Chemical compound [O-]C(=O)CCCCCCCCC([O-])=O CXMXRPHRNRROMY-UHFFFAOYSA-L 0.000 claims 1
- 239000011575 calcium Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229920005862 polyol Polymers 0.000 description 5
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 239000003729 cation exchange resin Substances 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 239000003957 anion exchange resin Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 150000003014 phosphoric acid esters Chemical class 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical class OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- IXWIAFSBWGYQOE-UHFFFAOYSA-M aluminum;magnesium;oxygen(2-);silicon(4+);hydroxide;tetrahydrate Chemical compound O.O.O.O.[OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] IXWIAFSBWGYQOE-UHFFFAOYSA-M 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910000286 fullers earth Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229930003811 natural phenol Natural products 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical class OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
- C10M175/0075—Working-up used lubricants to recover useful products ; Cleaning synthetic oil based
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/025—Purification; Separation; Stabilisation; Desodorisation of organo-phosphorus compounds
Definitions
- This invention relates to novel conditioning processes useful in prolonging the effective life of functional fluids such as hydraulic fluids.
- a variety of materials are utilised as non-aqueous hydraulic fluids and lubricants.
- the materials which are most commonly employed are triaryl phosphate esters, mineral oils and carboxylate esters. In use all of these materials degrade which degradation may manifest itself in the form of increased acidity of the fluid. As a result of this degradation the fluid must be replaced periodically. As this replacement is an expensive and time consuming operation a variety of reconditioning processes have been utilised in order to prolong the effective life of the fluid.
- molecular sieves are less effective for ester based fluids as the acids produced by hydrolysis tend to remove metal ions from the sieve which in turn can increase the amount of particulate material deposited in the fluid and adversely effect the fluids surface active properties.
- this invention provides a process for the treatment of a non-aqueous functional fluid which comprises contacting said fluid with an anionic ion exchange resin in the presence of sufficient water that the acidity of the fluid may be reduced and subsequently removing water from said fluid by vacuum dehydration.
- the processes of this invention may be utilised not only to maintain the condition of a fluid but also to recondition a degraded fluid.
- the process may be operated on a batch or a continuous basis or any combination of these two approaches.
- a portion of the fluid used in a particular apparatus will be passed through a bypass loop and the process will be applied to the fluid passing through the loop.
- the treated fluid will be combined with the main body of the fluid.
- the process may be operated continuously or intermittently in response to an analysis of the condition of the main body of the fluid.
- the contact between the fluid and the anionic ion-exchange resin may conveniently be carried out by passing the fluid through a bed of the resin. Conveniently the resin can be packed into a cartridge which is inserted into a circuit through which the fluid can be pumped. In the preferred embodiment this circuit will be a bypass loop through which a minor portion of the fluid is passed.
- anionic ion exchange resins normally contain relatively large amounts of water. Some of this water is picked up by the fluid and removed in the dehydration step. These commercial resins may be and preferably are utilised in the processes of this invention. The water content of the resin may be reduced prior to use but this is not normally necessary. We have discovered that the resin bed remains functional in the processes of this invention for long periods without the need for its regeneration. During the operation of the process the resin may become ineffective with the result that the acidity of the fluid is not reduced to or maintained at the desired level. In this circumstance it may be necessary to employ a fresh resin bed.
- the resin can be used either in the commercially available forms which are relatively wet or it can be predried so as to reduce its water content.
- the water content of a predried resin should not be reduced to a point at which it is rendered ineffective or degraded.
- resins which contain from 1 to 20 preferably from 3 to 15% w/w of water.
- the use of predried resins may be preferable since this minimises the initial increase in the water content of the fluid when it is contacted with the resin.
- the fluid After contact with the resin the fluid will contain a quantity of water and this is reduced by a vacuum dehydration process.
- dehydration processes can readily be effected using commercially available equipment such as the HIVAC 124 Oil Purifier and the HSP 181 Series Oil Purifiers sold by Pall Industrial Hydraulics Limited.
- the dehydration should be carried out at a temperature which is sufficiently low to avoid degradation of the fluid. In the case of triaryl phosphate based fluids the dehydration will preferably be carried out at a temperature of less than 75°C.
- the dehydration step need not remove all the water although it is preferred that as much water as is reasonably practical is removed.
- the dehydration step is preferably applied to the fluid shortly or immediately after it has been contacted with the ion-exchange resin. In this preferred embodiment the degradation of the fluid is minimised.
- the dehydration equipment is advantageously and conveniently situated on the by-pass loop immediately downstream of the resin bed. The dehydration step is more effective when applied to the relatively small volume of fluid using this arrangement.
- an anionic exchange resin treatment in combination with a vacuum dehydration step has been discovered to reduce the acidity of the fluid and may also serve to increase its volume resistivity.
- the treatment process also tends to increase the clarity of the fluid and to reduce the concentration of metal ions in the fluid.
- the treatment may also serve to improve the water separability of the fluid.
- the useful life of the fluid is prolonged as a result.
- the fluid is subjected to a vacuum with a pull of from 650 to 950 bar (110 to -200 mbar absolute pressure) and more preferably to a pull within the range 750 to 880 mbar (10 to -120 mbar absolute pressure).
- the processes of this invention may usefully be employed to treat any of the major classes of functional fluid in particular fluids based upon triaryl phosphates, trialkyl phosphates, alkyl aryl phosphates, mineral oils, carboxylate esters and water/glycol fluids.
- the processes of this invention find particular application in the treatment of triaryl phosphate based fluids.
- the triaryl phosphate may be derived from natural or synthetic phenols.
- phosphates derived from natural phenols include esityl phosphate, tricresyl phosphate, trixylenyl phosphate and cresyl diphenyl phosphate.
- the synthetic phenols are most preferably those prepared by the reaction of phenol with an alkylating agent having three or four carbon atoms. The product of such a reaction may comprise a mixture of phenols and alkylated phenols. Triaryl phosphates produced by the phosphorylation of such a mixture may also be used in this invention.
- carboxylate esters which may usefully be treated according to this invention include the trimellitates , diesters eg., adipates, sebacates and esters of trimethylolpropane and pentaerythritol.
- the processes of this invention are preferably used to maintain or return the properties of the fluid to the levels preferred by the user.
- the water content of the body of the fluid will preferably be maintained or reduced to less than 0.1% w/w and more preferably less that 0.05% w/w.
- the neutralisation number of the fluid will preferably be less than 0.2 mgKOH/gm and more preferably less than 0.1 mgKOH/gm.
- the processes of this invention offer an additional advantage in that the concentration of metal ions in the fluid, most notably, sodium, calcium, magnesium and aluminium can be controlled, or in the preferred embodiments reduced.
- the processes of this invention are preferably the sole process used to treat the fluid. They can, however, be used in combination with other known processes or with particular elements of those known processes.
- the fluid may also be contacted with a cationic ion exchange resin or with a filter comprising both an anionic and a cationic ion exchange resin.
- a cationic resin will detract from the advantages of the processes of this invention and is thereby less preferred.
- Functional fluids based on those various classes of compound will normally be formulated with minor proportions of other ingredients such as antifoaming agents and oxidation inhibitors.
- any particular anionic ion exchange resin for use in the processes of this invention may be determined by routine experiment. Those which are ineffective in reducing the level of acidity in the fluid are not useful. Likewise any resins which are not stable in the presence of the fluid are preferably not used. Examples of ion exchange resins which are useful in the processes of this invention include those sold under the Trade Marks AMBERLYST A-21, AMBERLYST IRA-68 and DOWEX 400LB UG.
- the physical form of resin may affect its performance in the processes of this invention. In particular we have discovered that uniformly sized resin particles (such as are sold as monospheres) may provide improved performance and their use forms a preferred aspect of this invention. The invention is illustrated by the following examples:-
- Test Fluid is passed through a vertical glass column, gravity fed, containing the specified solid treatment.
- the column and Test Fluid are * heated to 60°C by use of an infrared lamp. After several passes the "treated" fluid is analysed to determine any change in acidity.
- Test Fluid heated to 60°C is pumped from a stainless steel reservoir, through two stainless steel housings which contain the cartridges holding the specified solid treatment, and back into the reservoir, thus creating a continuous circulatory system.
- Example 2 The procedure of Example 2 was repeated using an ion exchange resin sold under the Trade Mark Dow M-43. The fluid utilised was Reolube TF46.
- Method A was utilised to treat a mineral oil based functional fluid (VG46) and a polyol ester based fluid.
- VG46 mineral oil based functional fluid
- polyol ester based fluid The water content of the resins was measured and the results of these tests are summarised in Table 5.
- Method B was adapted by connecting a Pall HSP 181 Series Oil Purifier Vacuum Dehydration Pump to the stainless steel reservoir.
- the resin used in these tests was DOWEX MONO AMW 400 LB UG (wet 50% water).
- the test fluid was a triaryl- phosphate functional fluid sold under the Trademark Reolube Turbofluid (TF)46 by the FMC Corporation (UK) Limited.
- the fluid was first treated by pumping it through the cartridges holding the ion-exchange resin. This treatment was continued until such time as the acidity of the resin was constant or nearly constant. Thereafter the fluid was pumped through the vacuum pump where it was subjected to a pull of 850 mbars. This vacuum treatment was continued until the water content of the fluid was less than 0.02% by weight.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Treatment Of Water By Ion Exchange (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Lubricants (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU65795/94A AU685454B2 (en) | 1993-05-05 | 1994-05-04 | Fluid treatment process |
DE69429341T DE69429341T2 (en) | 1993-05-05 | 1994-05-04 | METHOD FOR TREATING LIQUIDS |
US08/952,764 US6358895B1 (en) | 1994-05-04 | 1994-05-04 | Fluid treatment process |
EP94913767A EP0696311B1 (en) | 1993-05-05 | 1994-05-04 | Fluid treatment process |
JP6524066A JP3044485B2 (en) | 1993-05-05 | 1994-05-04 | Fluid treatment method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9309239.3 | 1993-05-05 | ||
GB939309239A GB9309239D0 (en) | 1993-05-05 | 1993-05-05 | Fluid treatment process |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994025550A1 true WO1994025550A1 (en) | 1994-11-10 |
Family
ID=10734959
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1994/000954 WO1994025550A1 (en) | 1993-05-05 | 1994-05-04 | Fluid treatment process |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0696311B1 (en) |
JP (1) | JP3044485B2 (en) |
AU (1) | AU685454B2 (en) |
DE (1) | DE69429341T2 (en) |
ES (1) | ES2170097T3 (en) |
GB (1) | GB9309239D0 (en) |
WO (1) | WO1994025550A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU687688B2 (en) * | 1993-06-19 | 1998-02-26 | Outotec Oyj | Process for a direct reduction of iron oxide-containing materials to form FE3C |
WO2005095556A1 (en) * | 2004-03-31 | 2005-10-13 | Nippon Oil Corporation | Metalworking fluid |
DE102009035401A1 (en) | 2009-07-30 | 2011-02-03 | Hydac Filter Systems Gmbh | filter means |
JP5627430B2 (en) * | 2010-12-08 | 2014-11-19 | 三菱重工業株式会社 | Apparatus for removing aromatic phosphate ester from waste oil and waste oil treatment system containing PCB |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3708508A (en) * | 1971-04-09 | 1973-01-02 | Atomic Energy Commission | Method for the purification and recovery of tributyl phosphate used in reprocessing nuclear fuel |
US3793408A (en) * | 1972-01-28 | 1974-02-19 | Atomic Energy Commission | Method for the purification of bis (2-ethyl-hexyl) phosphoric acid |
JPS5268152A (en) * | 1975-12-02 | 1977-06-06 | Nissin Electric Co Ltd | Method of purifying nnphospate ester oil for electric insulation |
JPS5315594A (en) * | 1976-07-28 | 1978-02-13 | Nissin Electric Co Ltd | Method of refining orthophosphoric acid ester oil for electric insulation |
US4203933A (en) * | 1977-05-20 | 1980-05-20 | Sadayoshi Mukai | Method of purifying triaryl phosphate |
EP0077102A2 (en) * | 1981-10-08 | 1983-04-20 | Stauffer Chemical Company | Reclamation of organophosphate fluids |
US4741857A (en) * | 1986-10-06 | 1988-05-03 | The United States Of America As Represented By The United States Department Of Energy | Method of purifying neutral organophosphorus extractants |
GB2248236A (en) * | 1990-09-29 | 1992-04-01 | British Nuclear Fuels Plc | Cleaning of solutions of alkylphosphates |
JPH04122792A (en) * | 1990-09-14 | 1992-04-23 | Hitachi Ltd | Refrigerator |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5233654A (en) * | 1975-09-05 | 1977-03-14 | Nissin Electric Co Ltd | Purification process of phosphoric ester oil for electric insulating materials |
-
1993
- 1993-05-05 GB GB939309239A patent/GB9309239D0/en active Pending
-
1994
- 1994-05-04 EP EP94913767A patent/EP0696311B1/en not_active Expired - Lifetime
- 1994-05-04 WO PCT/GB1994/000954 patent/WO1994025550A1/en active IP Right Grant
- 1994-05-04 JP JP6524066A patent/JP3044485B2/en not_active Expired - Fee Related
- 1994-05-04 ES ES94913767T patent/ES2170097T3/en not_active Expired - Lifetime
- 1994-05-04 DE DE69429341T patent/DE69429341T2/en not_active Expired - Lifetime
- 1994-05-04 AU AU65795/94A patent/AU685454B2/en not_active Ceased
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3708508A (en) * | 1971-04-09 | 1973-01-02 | Atomic Energy Commission | Method for the purification and recovery of tributyl phosphate used in reprocessing nuclear fuel |
US3793408A (en) * | 1972-01-28 | 1974-02-19 | Atomic Energy Commission | Method for the purification of bis (2-ethyl-hexyl) phosphoric acid |
JPS5268152A (en) * | 1975-12-02 | 1977-06-06 | Nissin Electric Co Ltd | Method of purifying nnphospate ester oil for electric insulation |
JPS5315594A (en) * | 1976-07-28 | 1978-02-13 | Nissin Electric Co Ltd | Method of refining orthophosphoric acid ester oil for electric insulation |
US4203933A (en) * | 1977-05-20 | 1980-05-20 | Sadayoshi Mukai | Method of purifying triaryl phosphate |
EP0077102A2 (en) * | 1981-10-08 | 1983-04-20 | Stauffer Chemical Company | Reclamation of organophosphate fluids |
US4741857A (en) * | 1986-10-06 | 1988-05-03 | The United States Of America As Represented By The United States Department Of Energy | Method of purifying neutral organophosphorus extractants |
JPH04122792A (en) * | 1990-09-14 | 1992-04-23 | Hitachi Ltd | Refrigerator |
GB2248236A (en) * | 1990-09-29 | 1992-04-01 | British Nuclear Fuels Plc | Cleaning of solutions of alkylphosphates |
Non-Patent Citations (3)
Title |
---|
DATABASE WPI Section Ch Week 7813, Derwent World Patents Index; Class E11, AN 78-24069A * |
DATABASE WPI Week 7729, Derwent World Patents Index; AN 77-51137Y * |
PATENT ABSTRACTS OF JAPAN vol. 016, no. 383 (C - 0974) 17 August 1992 (1992-08-17) * |
Also Published As
Publication number | Publication date |
---|---|
EP0696311B1 (en) | 2001-12-05 |
EP0696311A1 (en) | 1996-02-14 |
DE69429341T2 (en) | 2002-08-22 |
AU685454B2 (en) | 1998-01-22 |
ES2170097T3 (en) | 2002-08-01 |
AU6579594A (en) | 1994-11-21 |
JP3044485B2 (en) | 2000-05-22 |
DE69429341D1 (en) | 2002-01-17 |
JPH08506614A (en) | 1996-07-16 |
GB9309239D0 (en) | 1993-06-16 |
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