EP0041746A2 - Recovery of contaminated seal oils - Google Patents
Recovery of contaminated seal oils Download PDFInfo
- Publication number
- EP0041746A2 EP0041746A2 EP81200520A EP81200520A EP0041746A2 EP 0041746 A2 EP0041746 A2 EP 0041746A2 EP 81200520 A EP81200520 A EP 81200520A EP 81200520 A EP81200520 A EP 81200520A EP 0041746 A2 EP0041746 A2 EP 0041746A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- column
- oil
- seal
- contaminated
- 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.)
- Withdrawn
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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
- C10M175/005—Working-up used lubricants to recover useful products ; Cleaning using extraction processes; apparatus therefor
Definitions
- the invention relates to a process for removing volatile components from a contaminated seal oil.
- the sealing system of large rotary compressors such as those handling natural gas or process gas on a refinery, in many cases consists of two liquid-film seals with sealing oil admitted to the space between the seal rings at a slightly higher pressure than the gas to be sealed.
- the sealing oil (which in most cases is a mineral oil based lubricating oil) flows slowly past both seal rings: the portion which escapes on the atmospheric side of the seal is fit for re-use, but the portion escaping in the highpressure or gas side of the seal ring will be contaminated with components of these gases, which components are dependent on the composition of these gases and consist of e.g. hydrogen sulphide and/or light hydrocarbons.
- the seal oil which leaks from the high pressure side of the seal assembly cannot be recycled to the compressor without being purified. Hydrogen sulphide present therein has to be removed because it will be corrosive to the linings of the seals, and light hydrocarbons have to be removed because they dilute the seal oil and lower the flash point thereof, and accordingly increase its flammability.
- the invention provides a process for the removal of volatile components from contaminated seal oils by stripping in a specific way.
- a process for removing volatile components from a contaminated seal oil which comprises stripping the contaminated seal oil in countercurrent flow with an inert gaseous material in a tray column or a packed bed column.
- the trays may e.g. consist of valve trays, bubble cap trays or perforated plates.
- a packed bed column which is a column packed with solid particles, such as ceramic spheres, and in particular Raschig rings.
- the seal oil to be treated trickles in downward flow over the solid particles and forms liquid films on the surface thereof.
- the stripping may be carried out at a wide temperature range.
- the temperature will in general be adapted to the type of compounds to be removed from the seal oil, and to the inert gaseous material to be used as stripping agent.
- Temperatures from 20-120 o C are preferred. Atmospheric pressures or somewhat above are very suitable.
- An inert gaseous stripping material is a material which does not react with components of the seal oil or the contaminants thereof under the prevailing stripping conditions.
- Very suitable inert gaseous materials to be used in the stripping are nitrogen, air and steam.
- volatile components in particular hydrogen sulphide, can be substantially completely removed from contaminated seal oils, and the recovered seal oil can be recycled to the compressor.
- seal oil from which volatile components have been removed according to the process of the invention cannot be recycled indefinitely to the compressor because non-volatile contaminants will not have been removed. For that reason it is of advantage to remove a minor part of the contaminated seal oil, and add about the same amount of fresh oil to the purified oil to be recycled to the compressor.
- the invention is illustrated by way of example in the figure, which is a schematic one.
- Equipment which is not essential for the process according to the invention such as liquid and gas meters, heating and cooling equipment, has been omitted from the figure.
- Contaminated seal oil present in tank 1 is heated with heating equipment 2 to the required temperature and pumped with the aid of pump 3 via line 4 to the upper part of stripping column 5.
- Column 5 contains a bed 6 of 9.5 mm ceramic Raschig rings, which bed is supported by grid support 7. Stripping gas is introduced into column 5 below grid support 7 via line 8. Purified seal oil leaves column 5 via line 9. The stripping gas leaves column 5 via line 10.
- a buffer gas was provided to the labyrinth of the primary seals, so that the gas contacting the seal oil contained about 50 ppm H 2 S at 23 bar.
- the seal oil emerging from the pressure side of the seal contained from 1-100 ppm H 2 S and was forwarded to tank 1.
- the oil was heated with the aid of a steam coil to about 80°C, forwarded to, column 5 which has a diameter of a 0.30 m and contained a bed of 4 m length packed with 2.5 mm Raschig rings, and stripped with nitrogen at a pressure of 1.1 to 1.2 bar abs.
- the throughput was 1250 1/day of seal oil; the amount of nitrogen used was 1250 1/day.
- the purified oil did not contain any H 2 S, had a flash point of at least 180 0 , and could be recycled to the compressor.
- the seal rings on the compressor showed no sign of attack by corrosive agents on the biennial overhaul.
Abstract
A process for the removal of volatile components (light hydrocarbons and/or H2S) from a contaminated seal oil by stripping in countercurrent flow with an inert gaseous material (air, nitrogen, steam) in a tray column or a packed-bed column.
Description
- The invention relates to a process for removing volatile components from a contaminated seal oil.
- The sealing system of large rotary compressors, such as those handling natural gas or process gas on a refinery, in many cases consists of two liquid-film seals with sealing oil admitted to the space between the seal rings at a slightly higher pressure than the gas to be sealed. The sealing oil (which in most cases is a mineral oil based lubricating oil) flows slowly past both seal rings: the portion which escapes on the atmospheric side of the seal is fit for re-use, but the portion escaping in the highpressure or gas side of the seal ring will be contaminated with components of these gases, which components are dependent on the composition of these gases and consist of e.g. hydrogen sulphide and/or light hydrocarbons.
- The seal oil which leaks from the high pressure side of the seal assembly cannot be recycled to the compressor without being purified. Hydrogen sulphide present therein has to be removed because it will be corrosive to the linings of the seals, and light hydrocarbons have to be removed because they dilute the seal oil and lower the flash point thereof, and accordingly increase its flammability.
- The invention provides a process for the removal of volatile components from contaminated seal oils by stripping in a specific way.
- Accordingly there is provided a process for removing volatile components from a contaminated seal oil, which comprises stripping the contaminated seal oil in countercurrent flow with an inert gaseous material in a tray column or a packed bed column.
- In case a tray column is used the trays may e.g. consist of valve trays, bubble cap trays or perforated plates.
- It is preferred to use a packed bed column, which is a column packed with solid particles, such as ceramic spheres, and in particular Raschig rings. The seal oil to be treated trickles in downward flow over the solid particles and forms liquid films on the surface thereof.
- The stripping may be carried out at a wide temperature range. The temperature will in general be adapted to the type of compounds to be removed from the seal oil, and to the inert gaseous material to be used as stripping agent.
- Temperatures from 20-120oC are preferred. Atmospheric pressures or somewhat above are very suitable.
- An inert gaseous stripping material is a material which does not react with components of the seal oil or the contaminants thereof under the prevailing stripping conditions. Very suitable inert gaseous materials to be used in the stripping are nitrogen, air and steam.
- With the process according to the invention volatile components, in particular hydrogen sulphide, can be substantially completely removed from contaminated seal oils, and the recovered seal oil can be recycled to the compressor.
- It will be understood that seal oil from which volatile components have been removed according to the process of the invention, cannot be recycled indefinitely to the compressor because non-volatile contaminants will not have been removed. For that reason it is of advantage to remove a minor part of the contaminated seal oil, and add about the same amount of fresh oil to the purified oil to be recycled to the compressor.
- The invention is illustrated by way of example in the figure, which is a schematic one.
- Equipment which is not essential for the process according to the invention such as liquid and gas meters, heating and cooling equipment, has been omitted from the figure.
- Contaminated seal oil present in tank 1 is heated with
heating equipment 2 to the required temperature and pumped with the aid of pump 3 vialine 4 to the upper part of stripping column 5. Column 5 contains a bed 6 of 9.5 mm ceramic Raschig rings, which bed is supported by grid support 7. Stripping gas is introduced into column 5 below grid support 7 vialine 8. Purified seal oil leaves column 5 vialine 9. The stripping gas leaves column 5 vialine 10. - In a two-stage centrifugal compressor a gas, which contains about 7% H2S, was compressed from 1 bar abs. to 23 bar abs.
- In order to keep this gas removed from the seals as far as possible a buffer gas was provided to the labyrinth of the primary seals, so that the gas contacting the seal oil contained about 50 ppm H2S at 23 bar. The seal oil emerging from the pressure side of the seal contained from 1-100 ppm H2S and was forwarded to tank 1. In this tank the oil was heated with the aid of a steam coil to about 80°C, forwarded to, column 5 which has a diameter of a 0.30 m and contained a bed of 4 m length packed with 2.5 mm Raschig rings, and stripped with nitrogen at a pressure of 1.1 to 1.2 bar abs. The throughput was 1250 1/day of seal oil; the amount of nitrogen used was 1250 1/day. The purified oil did not contain any H2S, had a flash point of at least 1800, and could be recycled to the compressor. The seal rings on the compressor showed no sign of attack by corrosive agents on the biennial overhaul.
Claims (8)
1. A process for removing volatile components from a contaminated seal oil, characterized in that the contaminated seal oil is stripped in countercurrent flow with an inert gaseous material in a tray column or a packed bed column.
2. A process according to claim 1, characterized in that a packed bed column is used.
3. A process according to claim 2, characterized in that the packed bed consists of Raschig rings.
4. A process according to any one of the preceding claims, characterized in that the stripping is carried out at a temperature from 20-120°C.
5. A process according to any one of the preceding claims, characterized in that the inert gaseous material is nitrogen.
6. A process according to any one of claims 1-4, characterized in that the inert gaseous material is air.
7. A process according to any one of claims 1-4, characterized in that the inert gaseous material is steam.
8. A process according to claim 1, substantially as described with particular reference to the figure.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8018824 | 1980-06-09 | ||
GB8018824 | 1980-06-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0041746A2 true EP0041746A2 (en) | 1981-12-16 |
EP0041746A3 EP0041746A3 (en) | 1982-04-07 |
Family
ID=10513909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81200520A Withdrawn EP0041746A3 (en) | 1980-06-09 | 1981-05-14 | Recovery of contaminated seal oils |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0041746A3 (en) |
JP (1) | JPS5723694A (en) |
AU (1) | AU545950B2 (en) |
CA (1) | CA1180298A (en) |
NO (1) | NO811925L (en) |
ZA (1) | ZA813771B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5241092A (en) * | 1991-05-13 | 1993-08-31 | Praxair Technology, Inc. | Deodorizing edible oil and/or fat with non-condensible inert gas and recovering a high quality fatty acid distillate |
US5315020A (en) * | 1992-07-29 | 1994-05-24 | Praxair Technology, Inc. | Method of recovering waste heat from edible oil deodorizer and improving product stability |
US5403475A (en) * | 1993-01-22 | 1995-04-04 | Allen; Judith L. | Liquid decontamination method |
CN111909773A (en) * | 2020-07-22 | 2020-11-10 | 安徽国孚凤凰科技有限公司 | Method for removing peculiar smell of regenerated base oil |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5945398A (en) * | 1982-09-08 | 1984-03-14 | Tokuyama Soda Co Ltd | Purification of lubricating oil |
CH657867A5 (en) * | 1983-09-21 | 1986-09-30 | Buss Ag | METHOD FOR REPROCESSING ALTOEL AND DISTILLATION DEVICE FOR IMPLEMENTING THE METHOD. |
JPS6236497A (en) * | 1985-08-12 | 1987-02-17 | Tokuyama Soda Co Ltd | Recovery of oils |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR676678A (en) * | 1928-09-28 | 1930-02-26 | Procedes R Audubebt Sa Des | De-production of engine lubricating oils |
FR709242A (en) * | 1931-01-13 | 1931-08-04 | Rohol Vergaser Ges M B H | Process for the regeneration of lubricating oils in internal combustion machines |
US2635754A (en) * | 1946-08-13 | 1953-04-21 | Donald E Stem | Magnetic plate |
US3229900A (en) * | 1960-04-08 | 1966-01-18 | Battelle Development Corp | Reverse leakage seal for reciprocating parts |
FR2257678A1 (en) * | 1974-01-16 | 1975-08-08 | Foster Wheeler Corp | |
US4032441A (en) * | 1976-06-30 | 1977-06-28 | Larkin G Eugene | Method for reclaiming used hydraulic fluid |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3933953A (en) * | 1972-06-06 | 1976-01-20 | Max Leva | Apparatus for deodorizing fats and oils |
JPS524770B2 (en) * | 1973-03-31 | 1977-02-07 | ||
US4140586A (en) * | 1976-06-14 | 1979-02-20 | Bethlehem Steel Corporation | Method and apparatus for distillation |
-
1981
- 1981-05-05 CA CA000376901A patent/CA1180298A/en not_active Expired
- 1981-05-14 EP EP81200520A patent/EP0041746A3/en not_active Withdrawn
- 1981-06-05 JP JP8586981A patent/JPS5723694A/en active Pending
- 1981-06-05 NO NO811925A patent/NO811925L/en unknown
- 1981-06-05 ZA ZA00813771A patent/ZA813771B/en unknown
- 1981-06-09 AU AU71431/81A patent/AU545950B2/en not_active Ceased
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR676678A (en) * | 1928-09-28 | 1930-02-26 | Procedes R Audubebt Sa Des | De-production of engine lubricating oils |
FR709242A (en) * | 1931-01-13 | 1931-08-04 | Rohol Vergaser Ges M B H | Process for the regeneration of lubricating oils in internal combustion machines |
US2635754A (en) * | 1946-08-13 | 1953-04-21 | Donald E Stem | Magnetic plate |
US3229900A (en) * | 1960-04-08 | 1966-01-18 | Battelle Development Corp | Reverse leakage seal for reciprocating parts |
FR2257678A1 (en) * | 1974-01-16 | 1975-08-08 | Foster Wheeler Corp | |
US4032441A (en) * | 1976-06-30 | 1977-06-28 | Larkin G Eugene | Method for reclaiming used hydraulic fluid |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5241092A (en) * | 1991-05-13 | 1993-08-31 | Praxair Technology, Inc. | Deodorizing edible oil and/or fat with non-condensible inert gas and recovering a high quality fatty acid distillate |
US5374751A (en) * | 1991-05-13 | 1994-12-20 | Praxair Technology, Inc. | Deodorizing edible oil and/or with non-condensible inert gas and recovering a high quality fatty acid distillate |
US5315020A (en) * | 1992-07-29 | 1994-05-24 | Praxair Technology, Inc. | Method of recovering waste heat from edible oil deodorizer and improving product stability |
US5401866A (en) * | 1992-07-29 | 1995-03-28 | Praxair Technology, Inc. | Method of recovering waste heat from edible oil deodorizer and improving product stability |
US5403475A (en) * | 1993-01-22 | 1995-04-04 | Allen; Judith L. | Liquid decontamination method |
US5423979A (en) * | 1993-01-22 | 1995-06-13 | Allen; Judith L. | Liquid decontamination apparatus |
CN111909773A (en) * | 2020-07-22 | 2020-11-10 | 安徽国孚凤凰科技有限公司 | Method for removing peculiar smell of regenerated base oil |
Also Published As
Publication number | Publication date |
---|---|
JPS5723694A (en) | 1982-02-06 |
CA1180298A (en) | 1985-01-02 |
ZA813771B (en) | 1982-06-30 |
NO811925L (en) | 1981-12-10 |
AU7143181A (en) | 1981-12-17 |
AU545950B2 (en) | 1985-08-08 |
EP0041746A3 (en) | 1982-04-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT NL |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT NL |
|
17P | Request for examination filed |
Effective date: 19820125 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19830620 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: LANGRIDGE, CLIFFORD |