EP0129680A2 - Process for the treatment of process waste waters and waste waters in the hydrogenation of coal - Google Patents
Process for the treatment of process waste waters and waste waters in the hydrogenation of coal Download PDFInfo
- Publication number
- EP0129680A2 EP0129680A2 EP84105177A EP84105177A EP0129680A2 EP 0129680 A2 EP0129680 A2 EP 0129680A2 EP 84105177 A EP84105177 A EP 84105177A EP 84105177 A EP84105177 A EP 84105177A EP 0129680 A2 EP0129680 A2 EP 0129680A2
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- EP
- European Patent Office
- Prior art keywords
- water
- coal
- hydrogenation
- waste waters
- treatment
- 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.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/06—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by destructive hydrogenation
Definitions
- the invention relates to a process for the treatment of process water and waste water in the hydrogenation of coal.
- Coal hydrogenation is usually understood to mean the addition of molecular hydrogen to coal under pressure and under cracking conditions, with catalysts generally being present.
- Oxygen contained in the coal is partly converted into tar acids, i.e. Phenols, cresols and xylenols converted. Another proportion of oxygen leads to the formation of water of reaction.
- the hydrogenation is followed by separators in which the hydrogenation products are separated.
- the so-called cold separator separates the COAL OIL and the aqueous phase.
- Quench water is injected to prevent blockages due to salt formation in the pipes upstream of the cold separator. Together with the water of reaction in the cold separator, this forms the aforementioned aqueous phase.
- the tar acids are very water-soluble products. Some of them go into the reaction and quench water.
- the listed wastewater cannot be released into public waters due to the tar acid content and the hydrogen sulfide and ammonia still contained in them for environmental reasons.
- the state of the art is to feed them to a phenol recovery system with a downstream wastewater treatment after separation of hydrogen sulfide and ammonia.
- the waste water purified in this way can then be discharged with a remaining permissible residual phenol content.
- An older proposal (DE - 30 36 259 A 1 provides for the solution of the wastewater problems to use the waters containing tar acid in a Texaco gasification plant connected to the hydrogenation plant.
- the Texaco plant serves for the production of hydrogen from vacuum residue or coal, whereby The vacuum residue or the coal in a water suspension is introduced into the reactor.
- the suspension arises from the waters containing tar acid.
- the disposal possibility thus provided does not require any intermediate cleaning stages for the waters.
- the invention is therefore based on the object of simplifying the treatment of the process water and waste water in such cases. According to the invention this is achieved in that the tar-containing wastewater from atmospheric distillation and / or vacuum distillation is used as quench water and thus to reduce the necessary amount of demineralized water to be supplied. At the same time, the total amount of waste water from the hydrogenation system is reduced by the amount returned. This is ultimately linked to an increase in the amount of coal oil used by reducing the amount that passes into the aqueous phase Amount of tar acid as a result of the initial concentration of tar acid already contained in the return water.
- Dried coal is mashed with solvent in a slurry 1 and hydrogenated in a reactor 2 with the addition of hydrogen.
- the reaction products are separated in a hot separator downstream of the hydrogenation reactor 1.
- gases and vapors are drawn off overhead; a liquid phase, which contains the solids, is removed from the sump into the vacuum distillation 4.
- the top product of the hot separator 3 is passed to a downstream cold separator 5.
- the liquid phase is water, which is partly formed from the oxygen chemically bound in the coal and partly consists of injection water (quench water). This quench water is injected into the vapor phase behind the hot separator 3 in order to avoid blockages caused by crystallizing ammonium salts.
- the water contains part of the tar acids (phenols, cresols, xylenols), which are also formed in the hydrogenation from the oxygen contained in the coal.
- tar acids phenols, cresols, xylenols
- coal oil obtained is distilled atmospherically with addition of stripping steam in an atmospheric distillation 6.
- the water phase resulting from the cooling of the top product in turn contains tar acids.
- Light and medium oil of atm. Distillation 6 are subjected to a hydrogenating stabilization 7.
- the outgoing gas phase of the cold separator 5 is divided into recirculating and discharge gas after an oil wash carried out under process pressure.
- the discharge gas is cleaned in a gas scrubber 8 and broken down into hydrogen, heating gas, SNG and LPG in a low-temperature separation plant 9.
- the solid-containing residue of the hot separator 3 is topped in the vacuum distillation 4.
- the resulting heavy oil is extracted from the atm together with heavy and medium oil. Distillation as solvent in the mash 1.
- Steam jets are used to generate vacuum.
- the condensate of the propellant steam used contains tar components.
- the following wastewater quantities and concentrations were measured in a coal liquefaction plant for the hydrogenation of a gas flame coal extracted in the Ruhr area with a throughput of 152 t (waf) coal / d, corresponding to an hourly output of approx. 6.3 t / h:
- the water generated in the hydrogenation is composed of the residual moisture of the coal, the injection and formation water.
- the injection water volume is 34.8 t / d, ie the wastewater from the distillations 30.4 t / d can cover this water requirement approximately.
- the amount of waste water containing tar acid is advantageously reduced by this value. Instead of 76.1 t / d, there are only 45.7 t / d.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Industrial Gases (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Nach der Erfindung wird der Prozeßwasserbedarf und der Wasseranfall bei der Hydrierung von Kohle durch Verwendung der anfallenden Abwässer als Quenchwasser in den zum Kaltabscheider führenden Rohrzuleitungen verringert.According to the invention, the process water requirement and the amount of water in the hydrogenation of coal are reduced by using the waste water obtained as quench water in the pipe feed lines leading to the cold separator.
Description
Die Erfindung betrifft ein Verfahren zur Behandlung von Prozeßwässern und Abwässern bei der Hydrierung von Kohle.The invention relates to a process for the treatment of process water and waste water in the hydrogenation of coal.
Unter der Kohlehydrierung wird üblicherweise die Anlagerung von molekularem Wasserstoff an Kohle unter Druck und unter spaltenden Bedingungen verstanden, wobei im allgemeinen Katalysatoren anwesend sind.Coal hydrogenation is usually understood to mean the addition of molecular hydrogen to coal under pressure and under cracking conditions, with catalysts generally being present.
In der Kohle enthaltener Sauerstoff wird bei der Hydrierung zum Teil in Teersäuren, d.h. Phenole, Cresole und Xylenole umgewandelt. Ein weiterer Sauerstoffanteil führt zur Bildung von Reaktionswasser.Oxygen contained in the coal is partly converted into tar acids, i.e. Phenols, cresols and xylenols converted. Another proportion of oxygen leads to the formation of water of reaction.
Der Hydrierung nachgeschaltet sind Abscheider, in denen die Hydrierprodukte aufgetrennt werden. Im sogenannten Kaltabscheider erfolgt die Separierung von KOHLEÖL und wässriger Phase.The hydrogenation is followed by separators in which the hydrogenation products are separated. The so-called cold separator separates the COAL OIL and the aqueous phase.
Um in den dem Kaltabscheider vorgeschalteten Rohrleitungen Verstopfungen durch Ansalzungen zu vermeiden, wird Quenchwasser eingespritzt. Dieses bildet zusammen mit dem Reaktionswasser im Kaltabscheider die vorgenannte wässrige Phase.Quench water is injected to prevent blockages due to salt formation in the pipes upstream of the cold separator. Together with the water of reaction in the cold separator, this forms the aforementioned aqueous phase.
Bei den Teersäuren handelt es sich um sehr gut wasserlösliche Produkte. Ein Teil von ihnen geht in das Reaktions-und Quenchwasser über.The tar acids are very water-soluble products. Some of them go into the reaction and quench water.
Weitere Mengen teersäurehaltiger Abwässer fallen in der unter Zugabe von Wasserdampf durchgeführten atmosphärischen Destillation des in der Hydrierung gewonnenen Kohleöls sowie im Kondensat der Treibdampfstrahler der Vakuumdestillation des Hydrierrückstandes an.Further quantities of wastewater containing tar acid are obtained in the atmospheric distillation of the coal oil obtained in the hydrogenation, with the addition of steam, and in the condensate of the motive steam emitters of the vacuum distillation of the hydrogenation residue.
Die aufgeführten Abwässer können wegen des Teersäuregehaltes und des weiterhin in ihnen enthaltenen Schwefelwasserstoffs und Ammoniaks aus Umweltschutzgründen nicht in öffentliche Gewässer abgegeben werden. Stand der Technik ist, sie nach Abtrennung von Schwefelwasserstoff und Ammoniak einer Phenolgewinnungsanlage mit einer nachgeschalteten Abwasserbehandlung zuzuführen. Das so gereinigte Abwasser kann dann mit einem verbliebenen zulässigen Restgehalt an Phenolen abgeleitet werden.The listed wastewater cannot be released into public waters due to the tar acid content and the hydrogen sulfide and ammonia still contained in them for environmental reasons. The state of the art is to feed them to a phenol recovery system with a downstream wastewater treatment after separation of hydrogen sulfide and ammonia. The waste water purified in this way can then be discharged with a remaining permissible residual phenol content.
Ein älter Vorschlag (DE - 30 36 259 A 1 sieht zur Lösung der Abwässerprobleme eine Verwendung der teersäurehaltigen Wässer in einer mit der Hydrieranlage verbundenen Texaco-Vergaser-Anlage vor. Die Texaco-Anlage dient der Erzeugung von Wasserstoff aus Vakuumrückstand bzw. Kohle, wobei der Vakuumrückstand bzw. die Kohle in einer Wassersuspension in den Reaktor eingetragen wird. Die Suspension entsteht aus den teersäurehaltigen Wässern. Die damit gegebene Entsorgungsmöglichkeit erfordert keine Zwischenschaltung von Reinigungsstufen für die Wässer.An older proposal (DE - 30 36 259 A 1 provides for the solution of the wastewater problems to use the waters containing tar acid in a Texaco gasification plant connected to the hydrogenation plant. The Texaco plant serves for the production of hydrogen from vacuum residue or coal, whereby The vacuum residue or the coal in a water suspension is introduced into the reactor. The suspension arises from the waters containing tar acid. The disposal possibility thus provided does not require any intermediate cleaning stages for the waters.
Dort, wo keine Texaco-Vergaser-Anlage vorgesehen ist, ist man bisher weiter auf die oben beschriebene Aufbereitung der Prozeßabwässer angewiesen. Das erfordert einen erheblichen apparativen und energetischen Aufwand, der umso größer wird, je größer die zu reinigende Wassermenge ist.Where no Texaco carburetor system is provided, the treatment of process waste water described above is still required. This requires a considerable amount of equipment and energy, which increases the greater the amount of water to be cleaned.
Der Erfindung liegt daher die Aufgabe zugrunde, in derartigen Fällen die Behandlung der Prozeßwässer und Abwässer zu vereinfachen. Nach der Erfindung wird das dadurch erreicht, daß die teersäurehaltigen Abwässer der atmosphärischen Destillation und/ oder der Vakuumdestillation als Quenchwasser zu verwenden und damit die notwendige, zuzuführende entmineralisierte Wassermenge zu verringern. Gleichzeitig wird die anfallende Gesamtabwassermenge der Hydrieranlage um den rückgeführten Betrag vermindert. Verbunden damit ist schließlich eine Erhöhung der ausgebrachten Kohle- ölmenge durch Verringerung der in die wässrigen Phase übergehenden Teersäuremenge als Folge der bereits im Rückführwasser enthaltenen Teersäure-Anfangskonzentration.The invention is therefore based on the object of simplifying the treatment of the process water and waste water in such cases. According to the invention this is achieved in that the tar-containing wastewater from atmospheric distillation and / or vacuum distillation is used as quench water and thus to reduce the necessary amount of demineralized water to be supplied. At the same time, the total amount of waste water from the hydrogenation system is reduced by the amount returned. This is ultimately linked to an increase in the amount of coal oil used by reducing the amount that passes into the aqueous phase Amount of tar acid as a result of the initial concentration of tar acid already contained in the return water.
In der Zeichnung ist die erfindungsgemäße Verfahrensweise in Form eines Fließschemas schematisch dargestellt.In the drawing, the procedure according to the invention is shown schematically in the form of a flow diagram.
Getrocknete Kohle wird mit Lösungsmittel in einer Anmaischung 1 angemaischt und unter Zugabe von Wasserstoff in einem Reaktor 2 hydriert. In einem dem Hydrierreaktor 1 nachgeschalteten Heißabscheider erfolgt eine Trennung der Reaktionsprodukte. Im Heißabscheider 3 werden Gase und Dämpfe über Kopf abgezogen; aus dem Sumpf wird eine - die Feststoffe enthaltene Flüssigphase - in die Vakuumdestillation 4 abgeführt.Dried coal is mashed with solvent in a slurry 1 and hydrogenated in a reactor 2 with the addition of hydrogen. The reaction products are separated in a hot separator downstream of the hydrogenation reactor 1. In the hot separator 3, gases and vapors are drawn off overhead; a liquid phase, which contains the solids, is removed from the sump into the vacuum distillation 4.
Das Kopfprodukt des Heißabscheiders 3 wird nach Abkühlung einem nachgeschaltenen Kaltabscheider 5 zugeleitet. Zusammen mit dem Kohleöl fällt hier als flüssige Phase Wasser an, das teilweise aus dem in der Kohle chemisch gebundenem Sauerstoff gebildet wird, zu einem anderen Teil aus Einspritzwasser (Quenchwasser) besteht. Dieses Quenchwasser wird in die Dampfphase hinter dem Heißabscheider 3 eingespritzt, um Verstopfungen durch auskristallisierende Ammoniumsalze zu vermeiden.After cooling, the top product of the hot separator 3 is passed to a downstream
Das Wasser enthält einen Teil der Teersäuren (Phenole, Cresole, Xylenole), die ebenfalls in der Hydrierung aus dem in der Kohle enthaltenem Sauerstoff gebildet werden.The water contains part of the tar acids (phenols, cresols, xylenols), which are also formed in the hydrogenation from the oxygen contained in the coal.
Das gewonnene Kohleöl wird atmosphärisch unter Zugabe von Strippdampf in einer atmosphärischen Destillation 6 destilliert. Die bei der Abkühlung des Kopfproduktes entstehende Wasserphase enthält wiederum Teersäuren. Leicht- und Mittelöl der atm. Destillation 6 werden einer hydrierenden Stabilisierung 7 unterworfen.The coal oil obtained is distilled atmospherically with addition of stripping steam in an
Die über Kopf abgehende Gasphase des Kaltabscheiders 5 wird nach einer unter Prozeßdruck vollzogenen ölwäsche in rückgeführtes Kreislauf- und Ausschleusgas aufgeteilt. Das Ausschleusgas wird in einer Gaswäsche 8 gereinigt und in einer Tieftemperaturzerlegungsanlage 9 in Wasserstoff, Heizgas, SNG und LPG zerlegt.The outgoing gas phase of the
Der feststoffhaltige Rückstand des Heißabscheiders 3 wird in der Vakuumdestillation 4 getoppt. Das dabei gewonnene Schweröl wird zusammen mit Schwer- und Mittelöl aus der atm. Destillation als Lösungsmittel in die Anmaischung 1 zurückgefahren. Zur Vakuumerzeugung werden Dampfstrahler eingesetzt. Im Kondensat des dabei verwendeten Treibdampfes sind Teersäureanteile enthalten.The solid-containing residue of the hot separator 3 is topped in the vacuum distillation 4. The resulting heavy oil is extracted from the atm together with heavy and medium oil. Distillation as solvent in the mash 1. Steam jets are used to generate vacuum. The condensate of the propellant steam used contains tar components.
Aus dem Rückstand der Vakuumdestillation 4 wird in einer Vergasungsstufe 10 Synthesegas (CO + H2) bzw. in einer Konvertierung und Gaswäsche 11 Hydrierwasserstoff gewonnen.From the residue of
Reicht der über Kreislaufgas, Tieftemperaturzerlegung 9 und Rückstandsvergasung 10 rückgeführte Wasserstoff für Hydrierung und Stabilisierung nicht aus, wird über eine zusätzliche Kohlevergasung 12 mit nachgeschalteter Konvertierung und Gasreinigung 13 das Defizit gedeckt.If the hydrogen recirculated via cycle gas, low-temperature decomposition 9 and
Die erfindungsgemäße Rückführung der teersäurehaltigen Abwässer der Destillation zum Einspritzwasserstrom nach dem Heißabscheider 3 ist gestrichelt dargestellt. Die Rückführung erfolgt sowohl aus der atm. Destillation 6 als auch aus der Vakkumdestillation 4. Nachfolgend ist ein Zahlenbeispiel für die dadurch entstehende Verringerung der Abwässer gegeben.The return of the tar-containing wastewater from the distillation to the injection water stream after the hot separator 3 is shown in dashed lines. The return takes place both from the atm.
In einer Kohleverflüssigungsanlage zur Hydrierung einer im Ruhrgebiet geförderten Gasflammkohle mit einem Durchsatz von 152 t (waf) Kohle/d, entsprechend einer Stundenleistung von ca. 6,3 t/h, wurden folgende Abwassermengen und Konzentrationen gemessen:
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833322784 DE3322784A1 (en) | 1983-06-24 | 1983-06-24 | METHOD FOR TREATING PROCESS WASTEWATER AND WASTEWATER WHILE COAL HYDROGENATING |
DE3322784 | 1983-06-24 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0129680A2 true EP0129680A2 (en) | 1985-01-02 |
EP0129680A3 EP0129680A3 (en) | 1987-05-06 |
EP0129680B1 EP0129680B1 (en) | 1988-08-17 |
Family
ID=6202299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84105177A Expired EP0129680B1 (en) | 1983-06-24 | 1984-05-08 | Process for the treatment of process waste waters and waste waters in the hydrogenation of coal |
Country Status (9)
Country | Link |
---|---|
US (1) | US4597851A (en) |
EP (1) | EP0129680B1 (en) |
JP (1) | JPS6013886A (en) |
AU (1) | AU557994B2 (en) |
BR (1) | BR8403056A (en) |
CA (1) | CA1231655A (en) |
DE (2) | DE3322784A1 (en) |
PL (1) | PL146219B1 (en) |
ZA (1) | ZA844751B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6437303A (en) * | 1987-08-03 | 1989-02-08 | Komatsu Mfg Co Ltd | Liquid gnawing seal type continuous liquid/viscous object packaging method and equipment |
JPH01153410A (en) * | 1987-12-10 | 1989-06-15 | Komatsu Ltd | Liquid containing type packing method and apparatus for liquid and viscous material |
US6533945B2 (en) | 2000-04-28 | 2003-03-18 | Texaco Inc. | Fischer-Tropsch wastewater utilization |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB522037A (en) * | 1938-12-03 | 1940-06-06 | Int Hydrogeneeringsoctrooien | Improvements in the destructive hydrogenation of carbonaceous materials and in dephenolising waste water |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1983234A (en) * | 1925-02-14 | 1934-12-04 | Standard Ig Co | Conversion of solid fuels and product derived therefrom or o'ther materials into valuable liquids |
US1931550A (en) * | 1925-02-14 | 1933-10-24 | Standard Ig Co | Conversion of solid fuels and products derived therefrom or other materials into valuable liquids |
US1994075A (en) * | 1925-02-14 | 1935-03-12 | Standard Ig Co | Conversion of solid fuels and products derived therefrom or other materials into valuable liquids |
US1996009A (en) * | 1925-02-14 | 1935-03-26 | Standard Ig Co | Conversion of solid fuels and products derived therefrom or other materials into valuable liquids |
US1990708A (en) * | 1930-08-22 | 1935-02-12 | Standard Ig Co | Production of valuable hydrocarbons |
US3503866A (en) * | 1968-04-24 | 1970-03-31 | Atlantic Richfield Co | Process and system for producing synthetic crude from coal |
US3909390A (en) * | 1972-09-15 | 1975-09-30 | Universal Oil Prod Co | Coal liquefaction process |
US3926775A (en) * | 1973-11-01 | 1975-12-16 | Wilburn C Schroeder | Hydrogenation of coal |
US3944480A (en) * | 1974-03-29 | 1976-03-16 | Schroeder Wilburn C | Production of oil and high Btu gas from coal |
US3954596A (en) * | 1974-06-03 | 1976-05-04 | Schroeder Wilburn C | Production of low sulfur heavy oil from coal |
US4260471A (en) * | 1979-07-05 | 1981-04-07 | Union Oil Company Of California | Process for desulfurizing coal and producing synthetic fuels |
US4350582A (en) * | 1979-10-18 | 1982-09-21 | Chevron Research Company | Two-stage coal liquefaction process with process-derived solvent |
-
1983
- 1983-06-24 DE DE19833322784 patent/DE3322784A1/en not_active Withdrawn
-
1984
- 1984-05-08 DE DE8484105177T patent/DE3473472D1/en not_active Expired
- 1984-05-08 EP EP84105177A patent/EP0129680B1/en not_active Expired
- 1984-06-21 AU AU29703/84A patent/AU557994B2/en not_active Ceased
- 1984-06-22 ZA ZA844751A patent/ZA844751B/en unknown
- 1984-06-22 JP JP59127695A patent/JPS6013886A/en active Granted
- 1984-06-22 CA CA000457191A patent/CA1231655A/en not_active Expired
- 1984-06-22 PL PL1984248360A patent/PL146219B1/en unknown
- 1984-06-22 BR BR8403056A patent/BR8403056A/en not_active IP Right Cessation
- 1984-06-25 US US06/624,105 patent/US4597851A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB522037A (en) * | 1938-12-03 | 1940-06-06 | Int Hydrogeneeringsoctrooien | Improvements in the destructive hydrogenation of carbonaceous materials and in dephenolising waste water |
Also Published As
Publication number | Publication date |
---|---|
ZA844751B (en) | 1985-05-29 |
US4597851A (en) | 1986-07-01 |
PL248360A1 (en) | 1985-04-24 |
PL146219B1 (en) | 1989-01-31 |
JPH037237B2 (en) | 1991-02-01 |
BR8403056A (en) | 1985-05-28 |
DE3322784A1 (en) | 1985-01-03 |
DE3473472D1 (en) | 1988-09-22 |
JPS6013886A (en) | 1985-01-24 |
EP0129680A3 (en) | 1987-05-06 |
EP0129680B1 (en) | 1988-08-17 |
AU2970384A (en) | 1985-01-31 |
CA1231655A (en) | 1988-01-19 |
AU557994B2 (en) | 1987-01-15 |
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