CA2116827A1 - Apparatus and method for recovery of spent glycol - Google Patents
Apparatus and method for recovery of spent glycolInfo
- Publication number
- CA2116827A1 CA2116827A1 CA002116827A CA2116827A CA2116827A1 CA 2116827 A1 CA2116827 A1 CA 2116827A1 CA 002116827 A CA002116827 A CA 002116827A CA 2116827 A CA2116827 A CA 2116827A CA 2116827 A1 CA2116827 A1 CA 2116827A1
- Authority
- CA
- Canada
- Prior art keywords
- glycol
- fluid
- recovering
- industrial fluid
- industrial
- 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.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
- C09K3/185—Thawing materials
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
- C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
- C07C29/84—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation by extractive distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/20—Ground installations for de-icing aircraft
- B64F5/23—Ground installations for de-icing aircraft by liquid application; Spraying installations therefor, e.g. fitted on vehicles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Water Treatments (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
APPARATUS AND METHOD FOR RECOVERY OF SPENT GLYCOL
ABSTRACT
Apparatus and method for recovery of glycols from industrial fluids, such as spent deicing fluid comprising means for stripping water from the fluid to isolate the glycols, followed by distillation. The apparatus yields glycol that is > 99.5%
pure, and suitable for use in deicing aircraft.
ABSTRACT
Apparatus and method for recovery of glycols from industrial fluids, such as spent deicing fluid comprising means for stripping water from the fluid to isolate the glycols, followed by distillation. The apparatus yields glycol that is > 99.5%
pure, and suitable for use in deicing aircraft.
Description
r~ 3~ 27 , . . .
.., ~`
APPARA~US AND M13THOD FOR RECOVERY OF 8PENT GLYCOI, Introduction This application relates to apparatus and a method for recovering spent glycol for subsequent re-use. More particularly, this application relates to a method for recovering glycol based de-icing fluid and other glycol containing induskrial fluids by removal of contaminants and waterl enabling subsequent use of the fluid, as well as for purification of the removed water, rendering the removed water safe for discharge into the environment.
Back~round Of Thè Invention The accumulation of ic2 on the wings of aircraft is a recognized hazard. Ice distorts the shape of the airfoil, thus reducing the lift needed for controlled ~light. Ice also increases the weight of the aircraft, thereby impeding flight.
At present, ice is removed from the wings of aircraft prior to ~light by spraying them with a de-icing fluid. Typically the de-icing fluid is composed of ethylene glycol, propylene glycol or a mixture of the two. At present, at most sites, deicing fluid is discharyed as waste a~ter a single use. This practice burdens the environment, and wastes the glycol. Accordingly, is a need for recovering and recycling spent deicing fluid.
At present, commercial recycling of glycol involves filtration, deionization or distillation. These processes provide for recovery of glycol that is not, in general, sufficiently pure to be used for aircraft deicing applications.
Ethylene and propylene glycols are also used as antifreeze for automobile and truck engines. These antifreeze fluids must be replaced after extended use. There is also a need to recover glycols from these fluids for subse~uent use.
_mmary o~ he Invention The present invention provid~s for the e.conomical recovery of glycols from spent industrial fluids. The invention provides for recovery of glycols of sufficient purity for use in aircraft deicing. Water is stripped from glycol using a packed, heated tower. The isolated glycols are purified using vacuum distillation. Volatile organic compounds contaminaking e~fluent produced in the process are removed, permitting discharge of wa~te water into the environment. In a preferred embodiment, grease, oil and sclids are separated from spent glycols by mechanical means prior to stripping.
Brief Descrlp on Of The Drawinqs Figure 1 is a schematic drawing of a settling tank for cleaning spent glycol containing industrial fluid.
Figure 2 is a schematic drawing of apparatus for recovery of spent glycol from i.ndustrial fluid.
Figure 3 is a schematic drawing of apparatus or removal of volatile organic compounds ~rom effluent produced by the ~ 2 ~ .
apparatus for recovery of spent glycol from industrial fluid.
Detailed Description Of The Invention It is preferred that grease, oil and sediment are removed from spent industrial fluids prior to isolation and purification of glycols from them. Preferred means for removal of grease, oil and sediment is a settling tank with a steel m~sh partition aeparating first and second portions. As shown in Figure 1, spent industrial fluid ("in~luent") is added to a settling tank 1 by way of inlet pipe 2. First portion, 3 of settling tank 1 is separated from second portion, 4, by partition 5. Partition 5 is preferably a sheet of steel mesh.
In operation, spent glycol containing industrial fluid is permitted to stand in settling tank 1 until sediment has fallen to the bottom o~ tank 1, while organic contaminants, such as fuel and hydraulic fluid have floated to the top. The organic contaminants are removed Erom the surface of first portion 3 of tank 1 by pump 6. Sediment is collected and removed from the bottom of tank 1 as sludge. Partition 5 confines the organic contaminants to first portion 3 of tank 1. Cleaned, spent glycol containing industrial fluid is removed by way of line 7 from the second portion 4 of tank 1.
Grease, oil and sediment may also be removed from spent glycol containing industrial fluid prior to stripping and purification with a cartridge type filter.
Referring to Figure 2, cleaned spent glycol containiny ~b~
.
industrial fluid is accumulated in raw product holding tank lo.
In operation, the spent fluid is pumped using a pneumatic diaphragm pump 12 via stainless steel piping ~5 to heat exchanger 30, wherein it is warmed by 8 to 11 degrees centigrade using heat from natural gas heater 20. Blower 25 is drives hot air from heater 20 through packed tower 40. Preferably, blower 25 is an adjustable low profile air blower powered by a continuous-run high e~ficiency electric motor.
Water is stripped from the spent glycol containing industrial fluid in packed tower ~0. Warm air from heater 20 is introduced at the bottom of packed tower 40. The warmed fluid is introduced at the top of packed tower 40 by way of steel piping 35. The warmed fluid percolates through stainless steel packing 45 where warm air produced by heater 20 drives oEf water by the process of evaporation. In the presently preferred embodiment, the interior of tower 40 is maintained at a temperature of 140 to 160 degrees centigrade bv hot air from heater 20. Presently preferred packing is stainless steel packing obtained from Lan Pac~.
Stripped ylycol accumulates in reservoir 44 ak the base of packed tower 40. Water stripped from the spent glycol leaves packed tower 40 as vapor through exhaust ceiling 43. Condensate is removed via drain outlet 46.
The size of packed tower 40 is governed by the rate at which spent glycol containing fluid is to be processed. In the presently pre~erred embodimenk, the system accommodates a volume 2 ~
.
flow of about 10 gallons per minute, using tower dimensions of 20 inches (diameter~ and 25 feet (height). ~ifferent capacities may be accommodated by adjusting dimensions using relationships well known in chemical process engineering.
Progress of the skripping process is monitored by measuring the specific gravity of the stripped glycol accumulated in reservoir 44. Accumulated stripped glycol can be recirculated through packed tower 40 by way of recirculating loop bypass valve 48 and associated pump until the glycol is sufficiently dehydrated.
Dehydrated spent glycol is fed from packed tower outlet 47 to secondary holding tank 50. Therea~ter, the dehydrated glycol is puriPied in vacuum distillation tower 60. By conducting the distillation under vacuum, thermal decomposition of the glycol and acid formation is avoided. Dehydrated glycol is introduced into boiler 65 in distillation tower ~0 where it is vaporized by a liquid propane or natural gas heater. Vacuum is provided by vacuum pump 66. Glycol is cooled by condenser 64, continuing to condense as further cooling is ef~ected by passive heat exchanger 62. Purified glycol is withdrawn at passive heat exchanger 62 and is stored in finished product hatch tank 70. Purified glycol i5 wikhdrawn Prom the system at piping outlet 75.
The puri~ied glycol recovered is about 99.5% pure, and is appropriate for use as deicing fluid for aircraft. I'he liquid recovered ~rom distillation tower 60 includes bufPers, deicing Pluid additives and volatile organic compounds. This liquid may 2 ~
be discharged, or ~urther purified as described below.
Waste water rom the packed tower and vacuum distillation is optionally purified using a combination of filtration, ozone driven oxidation of volatile oryanic compounds, and activated polymers ~or removal of charged species. As shown in Figure 3, waste water is collected in reservoir 210. Introduction of ozone, produced by ozone generator 280, initiatPs destruction of volatile organic compounds. Caustic soda (sodium hydroxide solution) is stored in caustic batch mixing tank 220, and is added as needed to polymer mixing tank 250, to achieve a pH in the range 9.1 to g.5. Optionally, base may also be added to raw product holding tank 210.
Cation and anion polymer suspension, such as those available from MatrixrM or AquaBenrM are prepared in cation batch mixing tank 240 and anion batch mixing tank 230 respectively.
The suspensions are prepared to achieve a concentration of about 7 ppm each. The polymer suspension are added to waste water in polymer mixing tank 250, when the pH of the waste water has been adjusted with base.
The polymer treated waste water is allowed to stand in the polymer mixing tank 250 until solids have precipitated. The sludge is piped away to sludge aging tank 260, and stored.
ThereaEter the sludge is removed and compressed in filter press 270. The polymer treated waste water is piped to ozone reactor vessel 285, where it is treaited with ozone (5-20%) generated by spark discharge or ultraviolet radiation in ozone generator 280 ~J
`:
Ultraviolet radiation generation of ozone i5 preferred as it is more energy efficient than spark discharge. The ozone gas oxidizes and breaks down volatile organic compounds in the polymer treated waste water.
Water from the ozone reactor vessel is filtered using a combination of sand (290~ and twin activated carbon absorption beds (295), before discharge. The sand filter helps prevent blinding of the activated carbon. While one carbon absorption bed is in use the other is reyenerated with ozone. The treated water has contaminant levels reduced to about 1 ppm, which meets or exceeds present local and federal governmental requirements.
The foregoing description and drawings are for illustrative purposes only. Other embodiments of the inventions disclosed will be evident to those of ordinary skill. ''
.., ~`
APPARA~US AND M13THOD FOR RECOVERY OF 8PENT GLYCOI, Introduction This application relates to apparatus and a method for recovering spent glycol for subsequent re-use. More particularly, this application relates to a method for recovering glycol based de-icing fluid and other glycol containing induskrial fluids by removal of contaminants and waterl enabling subsequent use of the fluid, as well as for purification of the removed water, rendering the removed water safe for discharge into the environment.
Back~round Of Thè Invention The accumulation of ic2 on the wings of aircraft is a recognized hazard. Ice distorts the shape of the airfoil, thus reducing the lift needed for controlled ~light. Ice also increases the weight of the aircraft, thereby impeding flight.
At present, ice is removed from the wings of aircraft prior to ~light by spraying them with a de-icing fluid. Typically the de-icing fluid is composed of ethylene glycol, propylene glycol or a mixture of the two. At present, at most sites, deicing fluid is discharyed as waste a~ter a single use. This practice burdens the environment, and wastes the glycol. Accordingly, is a need for recovering and recycling spent deicing fluid.
At present, commercial recycling of glycol involves filtration, deionization or distillation. These processes provide for recovery of glycol that is not, in general, sufficiently pure to be used for aircraft deicing applications.
Ethylene and propylene glycols are also used as antifreeze for automobile and truck engines. These antifreeze fluids must be replaced after extended use. There is also a need to recover glycols from these fluids for subse~uent use.
_mmary o~ he Invention The present invention provid~s for the e.conomical recovery of glycols from spent industrial fluids. The invention provides for recovery of glycols of sufficient purity for use in aircraft deicing. Water is stripped from glycol using a packed, heated tower. The isolated glycols are purified using vacuum distillation. Volatile organic compounds contaminaking e~fluent produced in the process are removed, permitting discharge of wa~te water into the environment. In a preferred embodiment, grease, oil and sclids are separated from spent glycols by mechanical means prior to stripping.
Brief Descrlp on Of The Drawinqs Figure 1 is a schematic drawing of a settling tank for cleaning spent glycol containing industrial fluid.
Figure 2 is a schematic drawing of apparatus for recovery of spent glycol from i.ndustrial fluid.
Figure 3 is a schematic drawing of apparatus or removal of volatile organic compounds ~rom effluent produced by the ~ 2 ~ .
apparatus for recovery of spent glycol from industrial fluid.
Detailed Description Of The Invention It is preferred that grease, oil and sediment are removed from spent industrial fluids prior to isolation and purification of glycols from them. Preferred means for removal of grease, oil and sediment is a settling tank with a steel m~sh partition aeparating first and second portions. As shown in Figure 1, spent industrial fluid ("in~luent") is added to a settling tank 1 by way of inlet pipe 2. First portion, 3 of settling tank 1 is separated from second portion, 4, by partition 5. Partition 5 is preferably a sheet of steel mesh.
In operation, spent glycol containing industrial fluid is permitted to stand in settling tank 1 until sediment has fallen to the bottom o~ tank 1, while organic contaminants, such as fuel and hydraulic fluid have floated to the top. The organic contaminants are removed Erom the surface of first portion 3 of tank 1 by pump 6. Sediment is collected and removed from the bottom of tank 1 as sludge. Partition 5 confines the organic contaminants to first portion 3 of tank 1. Cleaned, spent glycol containing industrial fluid is removed by way of line 7 from the second portion 4 of tank 1.
Grease, oil and sediment may also be removed from spent glycol containing industrial fluid prior to stripping and purification with a cartridge type filter.
Referring to Figure 2, cleaned spent glycol containiny ~b~
.
industrial fluid is accumulated in raw product holding tank lo.
In operation, the spent fluid is pumped using a pneumatic diaphragm pump 12 via stainless steel piping ~5 to heat exchanger 30, wherein it is warmed by 8 to 11 degrees centigrade using heat from natural gas heater 20. Blower 25 is drives hot air from heater 20 through packed tower 40. Preferably, blower 25 is an adjustable low profile air blower powered by a continuous-run high e~ficiency electric motor.
Water is stripped from the spent glycol containing industrial fluid in packed tower ~0. Warm air from heater 20 is introduced at the bottom of packed tower 40. The warmed fluid is introduced at the top of packed tower 40 by way of steel piping 35. The warmed fluid percolates through stainless steel packing 45 where warm air produced by heater 20 drives oEf water by the process of evaporation. In the presently preferred embodiment, the interior of tower 40 is maintained at a temperature of 140 to 160 degrees centigrade bv hot air from heater 20. Presently preferred packing is stainless steel packing obtained from Lan Pac~.
Stripped ylycol accumulates in reservoir 44 ak the base of packed tower 40. Water stripped from the spent glycol leaves packed tower 40 as vapor through exhaust ceiling 43. Condensate is removed via drain outlet 46.
The size of packed tower 40 is governed by the rate at which spent glycol containing fluid is to be processed. In the presently pre~erred embodimenk, the system accommodates a volume 2 ~
.
flow of about 10 gallons per minute, using tower dimensions of 20 inches (diameter~ and 25 feet (height). ~ifferent capacities may be accommodated by adjusting dimensions using relationships well known in chemical process engineering.
Progress of the skripping process is monitored by measuring the specific gravity of the stripped glycol accumulated in reservoir 44. Accumulated stripped glycol can be recirculated through packed tower 40 by way of recirculating loop bypass valve 48 and associated pump until the glycol is sufficiently dehydrated.
Dehydrated spent glycol is fed from packed tower outlet 47 to secondary holding tank 50. Therea~ter, the dehydrated glycol is puriPied in vacuum distillation tower 60. By conducting the distillation under vacuum, thermal decomposition of the glycol and acid formation is avoided. Dehydrated glycol is introduced into boiler 65 in distillation tower ~0 where it is vaporized by a liquid propane or natural gas heater. Vacuum is provided by vacuum pump 66. Glycol is cooled by condenser 64, continuing to condense as further cooling is ef~ected by passive heat exchanger 62. Purified glycol is withdrawn at passive heat exchanger 62 and is stored in finished product hatch tank 70. Purified glycol i5 wikhdrawn Prom the system at piping outlet 75.
The puri~ied glycol recovered is about 99.5% pure, and is appropriate for use as deicing fluid for aircraft. I'he liquid recovered ~rom distillation tower 60 includes bufPers, deicing Pluid additives and volatile organic compounds. This liquid may 2 ~
be discharged, or ~urther purified as described below.
Waste water rom the packed tower and vacuum distillation is optionally purified using a combination of filtration, ozone driven oxidation of volatile oryanic compounds, and activated polymers ~or removal of charged species. As shown in Figure 3, waste water is collected in reservoir 210. Introduction of ozone, produced by ozone generator 280, initiatPs destruction of volatile organic compounds. Caustic soda (sodium hydroxide solution) is stored in caustic batch mixing tank 220, and is added as needed to polymer mixing tank 250, to achieve a pH in the range 9.1 to g.5. Optionally, base may also be added to raw product holding tank 210.
Cation and anion polymer suspension, such as those available from MatrixrM or AquaBenrM are prepared in cation batch mixing tank 240 and anion batch mixing tank 230 respectively.
The suspensions are prepared to achieve a concentration of about 7 ppm each. The polymer suspension are added to waste water in polymer mixing tank 250, when the pH of the waste water has been adjusted with base.
The polymer treated waste water is allowed to stand in the polymer mixing tank 250 until solids have precipitated. The sludge is piped away to sludge aging tank 260, and stored.
ThereaEter the sludge is removed and compressed in filter press 270. The polymer treated waste water is piped to ozone reactor vessel 285, where it is treaited with ozone (5-20%) generated by spark discharge or ultraviolet radiation in ozone generator 280 ~J
`:
Ultraviolet radiation generation of ozone i5 preferred as it is more energy efficient than spark discharge. The ozone gas oxidizes and breaks down volatile organic compounds in the polymer treated waste water.
Water from the ozone reactor vessel is filtered using a combination of sand (290~ and twin activated carbon absorption beds (295), before discharge. The sand filter helps prevent blinding of the activated carbon. While one carbon absorption bed is in use the other is reyenerated with ozone. The treated water has contaminant levels reduced to about 1 ppm, which meets or exceeds present local and federal governmental requirements.
The foregoing description and drawings are for illustrative purposes only. Other embodiments of the inventions disclosed will be evident to those of ordinary skill. ''
Claims (35)
1. Apparatus for recovering at least one glycol from an industrial fluid comprising:
a) means for stripping water from the at least one glycol present in the fluid; and b) means for purification by distillation of the at least one glycol dehydrated in step a) above.
a) means for stripping water from the at least one glycol present in the fluid; and b) means for purification by distillation of the at least one glycol dehydrated in step a) above.
2. The apparatus for recovering the at least one glycol from an industrial fluid of claim 1 wherein the means for stripping water from the at least one glycol present in the spent deicing fluid is a heated, packed tower.
3. The apparatus for recovering the at least one glycol from an industrial fluid of claim 2, further comprising means for preheating the fluid prior to stripping water therefrom.
4. The apparatus for recovering the at least one glycool from an industrial fluid of claim 2 further comprising means for recirculating stripped glycol in the heated, packed tower.
5. The apparatus for recovering the at least one glycol from an industrial fluid of claim 1 further comprising means for separating oils, solids and grease from the fluid.
6. The apparatus for recovering the at least one glycol from an industrial fluid of claim 5 wherein the means for separating oils, solids and grease from the fluid is a cartridge filter.
7. The apparatus for recovering the at least one glycol from an industrial fluid of claim 5 wherein the means for separating oils, solids and grease from the fluid is a settling tank.
8. The apparatus for recovering the at least one glycol from an industrial fluid of claim 7 wherein the settling tank comprises two portions separated from one another by a partition.
9. The apparatus for recovering the at least one glycol from an industrial fluid of claim 1, wherein the means for purification by distillation operates under a vacuum.
10. The apparatus for recovering the at least one glycol from an industrial fluid of claim 1, wherein the means for purification by distillation comprises a boiler and means for condensing vaporized gycol.
11. The apparatus for recovering the at least one glycol from an industrial fluid of claim 1, wherein the fluid is an aircraft deicing fluid.
12. The apparatus for recovering the at least one glycol from an industrial fluid of claim 1, wherein the fluid is selected from the group consisting of antifreeze and coolant for internal combustion engines.
13. The apparatus for recovering the at least one glycol from an industrial fluid of claim 1, wherein the fluid contains at least one glycol selected from the group consisting of ethylene glycol, propylene glycol, and a mixture of ethylene glycol and propolyene glycol.
14. The apparatus for recovering the at least one glycol from an industrial fluid of claim 1, further comprising means for purifying waste water produced thereby.
15. The apparatus for recovering the at least one glycol from an industrial fluid of claim 14, wherein the means for purifying waste water comprises activated polymer means for removal of charged species, ozone driven oxidation means for destruction of volatile organic compounds, and filtration means.
16. The apparatus for recovering the at least one glycol from an industrial fluid of claim 15, wherein the means for removal of charged species includes cation polymer suspensions and anion polymer suspensions.
17. The apparatus for recovering the at least one glycol from an industrial fluid of claim 15, wherein the ozone driven oxidation means for destruction of volatile organic compounds comprises an ozone generator, and an ozone reactor vessel.
18. The apparatus for recovering the at least one glycol from an industrial fluid of claim 17, wherein the ozone generator is selected from the group consisting of ultraviolet lamps and a spark discharge device.
19. The apparatus for recovering the at least one glycol from an industrial fluid of claim 14, wherein the filtration means comprises at least one activated carbon absorption bed.
20. The apparatus for recovering the at least one glycol from an industrial fluid of claim 19, wherein the filtration means further comprises a sand filter.
21. The apparatus for recovering the at least one glycol from an industrial fluid of claim 19, wherein the at least one carbon absorption bed can be regenerated by exposure to ozone.
22. The apparatus for recovering the at least one glycol from an industrial fluid of claim 14, further comprising means for adjusting the pH of the waste water.
23. A method for recovery of at least one glycol from an industrial fluid comprising:
a) stripping water from the at least one glycol present in the fluid; and b) purifying by distillation the at least one glycol dehydrated in step a) above.
a) stripping water from the at least one glycol present in the fluid; and b) purifying by distillation the at least one glycol dehydrated in step a) above.
24. A method for recovery of at least one glycol from an industrial fluid of claim 23 wherein the at least one glycol present in the industrial fluid is dehydrated using is a heated, packed tower.
25. The method for recovery of at least one glycol from an industrial fluid of claim 24, wherein the fluid is warmed prior to stripping water therefrom.
26. The method for recovery of at least one glycool from an industrial fluid of claim 24 wherein stripped glycol us recirculated in the heated, packed tower.
27. The method for recovery of at least one glycol from an industrial fluid of claim 23 wherein oils, solids and grease are separated from the fluid prior to the step of stripping.
28. The method for recovery of at least one glycol from an industrial fluid of claim 27, wherein oils, solids and grease are separated from the fluid using a cartridge filter.
29. The method for recovering the at least one glycol from an industrial fluid of claim 27 wherein oils, solids and grease are separated from the fluid using a settling tank.
30. The method for recovery of at least one glycol from an industrial fluid of claim 23, wherein the step of purification by distillation is carried out in a vacuum.
31. The method for recovery of at least one glycol from an industrial fluid of claim 23, wherein the fluid is an aircraft deicing fluid.
32. The method for recovery of at least one glycol from an industrial fluid of claim 23, wherein the fluid is selected from the group consisting of antifreeze and coolant for internal combustion engines.
33. The method for recovery of at least one glycol from an industrial fluid of claim 23, wherein the fluid contains a mixture of glycols selected from the group ethylene glycol and propylene glycol.
34. The method for recovery of at least one glycol from an industrial fluid of claim 23, further comprising a method for purifying waste water resulting therefrom.
35. The method for recovery of at least one glycol from an industrial fluid of claim 34, wherein the method for purifying waste water comprises the steps of removal of charged species by activated polymers, destruction of volatile organic compounds by ozone, and filtration.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14630393A | 1993-11-02 | 1993-11-02 | |
| US146,303 | 1993-11-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2116827A1 true CA2116827A1 (en) | 1995-05-03 |
Family
ID=22516770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002116827A Abandoned CA2116827A1 (en) | 1993-11-02 | 1994-03-02 | Apparatus and method for recovery of spent glycol |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2116827A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999015486A1 (en) * | 1997-09-19 | 1999-04-01 | De-Icing Inc. | Method and apparatus for purification of deicing fluid for recovery of glycol |
| US5928477A (en) * | 1998-01-07 | 1999-07-27 | Inland Technologies Inc. | Method and apparatus for removing water from an aqueous fluid mixture |
| EP1058575B1 (en) * | 1997-12-05 | 2004-07-21 | Inland Technologies Inc. | Method and apparatus for removing water from aqueous fluid mixture |
| WO2010072311A2 (en) * | 2008-12-24 | 2010-07-01 | Clariant International Ltd | Process for workup of glycol-containing aircraft deicers |
| WO2010072312A2 (en) * | 2008-12-24 | 2010-07-01 | Clariant International Ltd | Method for reprocessing aircraft de-icing agents comprising glycol |
| WO2010011783A3 (en) * | 2008-07-23 | 2010-07-29 | Brad Michael Malatesta | Method of cleaning and recycling glycol-tainted water from de-icing operations at airports |
| WO2017156615A1 (en) | 2016-03-16 | 2017-09-21 | Aéro Mag 2000 Rrr Inc. | Method and system for recycling spent ethylene glycol from recovered aircraft de-icing solutions |
| US10144688B2 (en) | 2016-03-17 | 2018-12-04 | Aéro Mag 2000 Rrr Inc. | Method and system for recycling spent ethylene glycol from recovered aircraft de-icing solutions |
-
1994
- 1994-03-02 CA CA002116827A patent/CA2116827A1/en not_active Abandoned
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999015486A1 (en) * | 1997-09-19 | 1999-04-01 | De-Icing Inc. | Method and apparatus for purification of deicing fluid for recovery of glycol |
| US6565753B1 (en) | 1997-09-19 | 2003-05-20 | De-Icing, Inc. | Method for purification of deicing fluid for recovery of glycol |
| EP1058575B1 (en) * | 1997-12-05 | 2004-07-21 | Inland Technologies Inc. | Method and apparatus for removing water from aqueous fluid mixture |
| US5928477A (en) * | 1998-01-07 | 1999-07-27 | Inland Technologies Inc. | Method and apparatus for removing water from an aqueous fluid mixture |
| US6120651A (en) * | 1998-01-07 | 2000-09-19 | Inland Technologies Inc. | Method for removing water from an aqueous fluid mixture |
| US8252149B2 (en) | 2007-07-24 | 2012-08-28 | Brad Michael Malatesta | Method of cleaning and recycling glycol-tainted water from de-icing operations at airports |
| WO2010011783A3 (en) * | 2008-07-23 | 2010-07-29 | Brad Michael Malatesta | Method of cleaning and recycling glycol-tainted water from de-icing operations at airports |
| WO2010072312A2 (en) * | 2008-12-24 | 2010-07-01 | Clariant International Ltd | Method for reprocessing aircraft de-icing agents comprising glycol |
| WO2010072312A3 (en) * | 2008-12-24 | 2011-02-24 | Clariant Finance (Bvi) Limited | Method for reprocessing aircraft de-icing agents comprising glycol |
| WO2010072311A3 (en) * | 2008-12-24 | 2011-02-24 | Clariant Finance (Bvi) Limited | Process for workup of glycol-containing aircraft deicers |
| US20110303870A1 (en) * | 2008-12-24 | 2011-12-15 | Clariant Finance (Bvi) Limited | Process For Workup Of Glycol-Containing Aircraft Deicers |
| JP2012514053A (en) * | 2008-12-24 | 2012-06-21 | クラリアント・ファイナンス・（ビーブイアイ）・リミテッド | Method for treating glycol-containing aircraft deicing agents |
| WO2010072311A2 (en) * | 2008-12-24 | 2010-07-01 | Clariant International Ltd | Process for workup of glycol-containing aircraft deicers |
| US8262927B2 (en) * | 2008-12-24 | 2012-09-11 | Clariant Finance (Bvi) Limited | Process for workup of glycol-containing aircraft deicers |
| WO2017156615A1 (en) | 2016-03-16 | 2017-09-21 | Aéro Mag 2000 Rrr Inc. | Method and system for recycling spent ethylene glycol from recovered aircraft de-icing solutions |
| RU2710555C1 (en) * | 2016-03-16 | 2019-12-27 | Аэро Маг 2000 Ррр Инк. | Method and system for processing for secondary use of spent ethylene glycol from regenerated anti-icing solutions for aircraft |
| US10144688B2 (en) | 2016-03-17 | 2018-12-04 | Aéro Mag 2000 Rrr Inc. | Method and system for recycling spent ethylene glycol from recovered aircraft de-icing solutions |
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