EP0148554B1 - Coal gasification process - Google Patents
Coal gasification process Download PDFInfo
- Publication number
- EP0148554B1 EP0148554B1 EP84305601A EP84305601A EP0148554B1 EP 0148554 B1 EP0148554 B1 EP 0148554B1 EP 84305601 A EP84305601 A EP 84305601A EP 84305601 A EP84305601 A EP 84305601A EP 0148554 B1 EP0148554 B1 EP 0148554B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquor
- steam
- coal
- aqueous
- effluent
- 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.)
- Expired
Links
- 239000003245 coal Substances 0.000 title claims description 15
- 238000002309 gasification Methods 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 150000002894 organic compounds Chemical class 0.000 claims description 2
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 239000000376 reactant Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/02—Fixed-bed gasification of lump fuel
- C10J3/06—Continuous processes
- C10J3/16—Continuous processes simultaneously reacting oxygen and water with the carbonaceous material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/02—Fixed-bed gasification of lump fuel
- C10J3/06—Continuous processes
- C10J3/08—Continuous processes with ash-removal in liquid state
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0973—Water
- C10J2300/0976—Water as steam
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
- C10J2300/1656—Conversion of synthesis gas to chemicals
- C10J2300/1662—Conversion of synthesis gas to chemicals to methane
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
- C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
Definitions
- This invention relates to coal gasification processes.
- these effluent liquors can be treated to remove phenols and ammonia before biological treatments.
- the untreated or partially treated liquor can be incinerated, leaving a solid for disposal. All of these effluent treatment processes have some disadvantage and present technological difficulties.
- the present invention provides a process for the production of methane-containing gases wherein a feedstock comprising coal is gasified in the presence of steam and oxygen as gasifying agents, under fixed-bed, ash-slagging conditions and the product gas is treated to remove therefrom an effluent liquor containing condensed unreacted steam, water soluble compounds and condensed organic compounds characterised in that a portion of the steam requirement for the reaction is provided by adding an aqueous liquor comprising said effluent liquor togther with the said gasifying agents directly through the tuyeres into the raceway of a fixed bed ash slagging gasifier.
- the aqueous liquor may also comprise purer forms of water such as that used for cooling purposes or as boiler feed.
- the recycled liquor is injected at the point where the other gasifying agents are added i.e. through tuyeres into the raceway.
- the steam buffle and tuyeres would be modified to provide liquor or water at the point of steam injection.
- aqueous species confers a number of surprising advantages, although it was to be expected that such addition would have an adverse effect upon either the operation of the gasifier or the slag-tapping operations. However, in neither case was any difficulty noted.
- the oxygen consumption (based upon the amount of carbonaceous material consumed) was found to have increased slightly but this was more than offset in the savings in cost in not having to raise steam.
- the organic species are, of course, useful as a reactant species.
- the steam requirement for gasification is substantially reduced.
- up to about 50% of virtually all the liquor normally produced for a bituminous coal is recycled.
- Up to 50% the total H 2 0 species requirement for the gasification reaction may be provided by the aqueous liquor viz as water per se or as recycled liquor.
- a further advantage is that inorganic materials contained in the effluent liquor are taken up by the slag and thus are removed, with the slag, from the system.
- the heavy metal content of the slag e.g. zirconium is increased compared with no liquor injection being employed.
- a bleed off of some of the liquor may be desirable for treatment to remove chlorides and other salts when build up of these compounds in the recycling liquor begins to occur.
- the aqueous liquor may contain some organic species dissolved or emulsified therein.
- the liquor may be used as vehicle for conveying suspended solid materials, i.e. coal fines, to the reactor.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Industrial Gases (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
- This invention relates to coal gasification processes.
- During the gasification of coal with steam and oxygen an aqueous liquor is produced consisting mainly of solubilized phenolic compounds, ammonia, hydrogen sulphide, hydrogen cyanide, alkali metals and salts. This effluent cannot be discharged to waste without treatment since the biological oxygen demand is far too great for the environment to cope with without serious ecological effects. The problem is far more serious with ash-slagging processes than with dry-ash processes since the steam requirement for the process is generally less and the by-produced effluent liquors tend to be more concentrated.
- Conventionally, these effluent liquors can be treated to remove phenols and ammonia before biological treatments. Alternatively the untreated or partially treated liquor can be incinerated, leaving a solid for disposal. All of these effluent treatment processes have some disadvantage and present technological difficulties.
- The recycling of aqueous liquors obtained during the steam/oxygen gasification of coal is already known. For example, in PCT publication No. WO 80/00974 there is disclosed a process wherein aqueous liquors obtained during the dry-ash, fixed bed gasification of coal is fed to an entrained bed ash-slagging gasifier. Similarly, US-A-3971636 teaches recycling an aqueous condensate separated from synthesis gas obtained by the ash-slagging, fluidised bed gasification of coal. In these examples the aqueous liquor is used as a vehicle for feeding coal fines in the form of slurries to the gasifier.
- Although in these references the primary gasifier is an ash-slagging gasifier, they had completely differing modes of operation. In neither case is the ash-slagging gasifier of fixed bed construction and because of this there are obvious advantages in that a non-fixed bed arrangement allows the liquor to be rapidly heated and thus eliminates any danger of the reactions being quenched.
- Indeed as will be seen from the teachings in W080/00974, effluent liquor obtained from the fixed bed stage is only recycled to the entrained stage.
- From a consideration of the prior art it would not be expected that recycle liquor injection could be successfully achieved with fixed bed ash-slagging gasifiers.
- We have now surprisingly found that effective operation of a coal gasification under fixed bed, ash slagging conditions can be achieved by direct injection of aqueous liquor together with other gasifying agents, and that where such liquor is an effluent liquor the problem of disposal is substantially alleviated.
- Thus the present invention provides a process for the production of methane-containing gases wherein a feedstock comprising coal is gasified in the presence of steam and oxygen as gasifying agents, under fixed-bed, ash-slagging conditions and the product gas is treated to remove therefrom an effluent liquor containing condensed unreacted steam, water soluble compounds and condensed organic compounds characterised in that a portion of the steam requirement for the reaction is provided by adding an aqueous liquor comprising said effluent liquor togther with the said gasifying agents directly through the tuyeres into the raceway of a fixed bed ash slagging gasifier.
- The aqueous liquor may also comprise purer forms of water such as that used for cooling purposes or as boiler feed.
- The recycled liquor is injected at the point where the other gasifying agents are added i.e. through tuyeres into the raceway. In practice the steam buffle and tuyeres would be modified to provide liquor or water at the point of steam injection.
- The addition of the aqueous species confers a number of surprising advantages, although it was to be expected that such addition would have an adverse effect upon either the operation of the gasifier or the slag-tapping operations. However, in neither case was any difficulty noted. The oxygen consumption (based upon the amount of carbonaceous material consumed) was found to have increased slightly but this was more than offset in the savings in cost in not having to raise steam. In addition a considerable advantage accrued in that if the liquor is aqueous effluent not only are there considerable savings in being able to reuse the water, but also the dissolved and suspended materials are disposed of in the reactor. The organic species are, of course, useful as a reactant species.
- Thus, in recycling liquor in this way the steam requirement for gasification is substantially reduced. For example, up to about 50% of virtually all the liquor normally produced for a bituminous coal is recycled. Up to 50% the total H20 species requirement for the gasification reaction may be provided by the aqueous liquor viz as water per se or as recycled liquor. A further advantage is that inorganic materials contained in the effluent liquor are taken up by the slag and thus are removed, with the slag, from the system. The heavy metal content of the slag e.g. zirconium is increased compared with no liquor injection being employed. A bleed off of some of the liquor may be desirable for treatment to remove chlorides and other salts when build up of these compounds in the recycling liquor begins to occur. The aqueous liquor may contain some organic species dissolved or emulsified therein. However, in addition, the liquor may be used as vehicle for conveying suspended solid materials, i.e. coal fines, to the reactor.
- The invention will now be illustrated by reference to the following example:
- A fixed-bed, ash-slagging coal gasification plant, for example as in "The Chemistry of Coal Utilization", 2nd Supplementary Volume, 1981, published by John Wiley & Son, Inc., was modified to allow injection of liquid aqueous species down the steam oxygen tuyeres. The plant was started up according to conventional techniques for the steam/oxygen gasification on Markam Mains Coal at a working pressure of 24.78 br(g). The reactant feed rates and gas production rate are summarized in the following Table. In column A, the reactant rates prior to liquor injection are given. Liquor injection was increased by the steps shown in Columns B, C and D over a period of 21 hours.
Claims (4)
1. A process for the production of methane-containing gas wherein a feedstock comprising a coal is gasified in the presence of steam and oxygen as gasifying agents, under fixed-bed ash-slagging conditions and the product gas is treated to remove thereform an effluent liquor containing condensed unreacted steam, water-soluble compounds and condensed organic compounds, characterised in that a portion of the steam requirement for the reaction is provided by adding an aqueous liquor comprising said effluent liquor together with the said gasifying agents directly through the tuyeres into the raceway of a fixed bed ash slagging gasifier.
2. A process as claimed in Claim 1, wherein up to 50% of the H20 species required for the gasification reaction are provided by aqueous liquor.
3. A process as claimed in Claim 1, wherein said aqueous liquor is a vehicle for suspended materials.
4. A process as claimed in Claim 3, wherein said suspended materials are coal fines.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8322899 | 1983-08-25 | ||
| GB838322899A GB8322899D0 (en) | 1983-08-25 | 1983-08-25 | Coal gasification process |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0148554A2 EP0148554A2 (en) | 1985-07-17 |
| EP0148554A3 EP0148554A3 (en) | 1986-01-22 |
| EP0148554B1 true EP0148554B1 (en) | 1988-10-19 |
Family
ID=10547868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84305601A Expired EP0148554B1 (en) | 1983-08-25 | 1984-08-17 | Coal gasification process |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0148554B1 (en) |
| JP (1) | JPS6076593A (en) |
| KR (1) | KR860001121B1 (en) |
| CS (1) | CS265208B2 (en) |
| DE (1) | DE3474685D1 (en) |
| GB (3) | GB8322899D0 (en) |
| IN (1) | IN162228B (en) |
| NO (1) | NO843385L (en) |
| PL (1) | PL145182B1 (en) |
| ZA (1) | ZA846540B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0220342A1 (en) * | 1985-11-01 | 1987-05-06 | Metallgesellschaft Ag | Process for treating an aqueous condensate |
| DE102006041838B4 (en) * | 2006-09-04 | 2010-08-05 | Siemens Aktiengesellschaft | Process for gasifying solid gasification substances in slag bath gasification reactors |
| CN101812323B (en) * | 2009-08-14 | 2013-02-13 | 赛鼎工程有限公司 | Method for using multi-element mixed gasification agent to prepare synthesis gas by dry slagging of fixed bed |
| DE102013113769B4 (en) * | 2013-12-10 | 2020-07-16 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Process for the fixed bed pressure gasification of carbonaceous fuels |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB237883A (en) * | 1924-07-29 | 1926-12-20 | Louis Chavanne | Improved process and apparatus for the gasification of solid fuel, applicable also to volatilizing or reducing ores |
| GB717484A (en) * | 1952-01-17 | 1954-10-27 | Kloeckner Humboldt Deutz Ag | A method and a device for the disposal of phenol-containing waste water |
| DE1496384A1 (en) * | 1965-12-31 | 1969-05-14 | Projektierungs Konstruktions U | Procedure for the containment and removal of the dust from the raw gas and the condensates during pressure gasification |
| NL189517C (en) * | 1974-12-05 | 1993-05-03 | Shell Int Research | PROCESS FOR THE PREPARATION OF SYNTHESIS GAS. |
| US3971636A (en) * | 1974-12-23 | 1976-07-27 | Gulf Oil Corporation | Condensate scrubbing of coal gasifier product |
| DE2607745C2 (en) * | 1976-02-26 | 1984-03-15 | Metallgesellschaft Ag, 6000 Frankfurt | Process for treating condensate from the cooling of raw gas from the pressurized gasification of solid fuels |
| US4175929A (en) * | 1978-08-29 | 1979-11-27 | The United States Of America As Represented By The United States Department Of Energy | Process for control of pollutants generated during coal gasification |
| US4199327A (en) * | 1978-10-30 | 1980-04-22 | Kaiser Engineers, Inc. | Process for gasification of coal to maximize coal utilization and minimize quantity and ecological impact of waste products |
| JPS5699295A (en) * | 1979-12-29 | 1981-08-10 | Chiyouei Ko | Gas generator |
| SE434163B (en) * | 1981-03-10 | 1984-07-09 | Skf Steel Eng Ab | SET AND DEVICE FOR PREPARING A MAIN COOLOXIDE AND VETGAN CONTAINING GAS FROM COAL AND / OR CARBON-CONTAINING INGREDIENTS |
| EP0083670A1 (en) * | 1982-01-07 | 1983-07-20 | Ruhrkohle Aktiengesellschaft | Process for the elimination of process water effluents containing tar acids |
| GB2116580B (en) * | 1982-03-12 | 1985-04-11 | British Gas Corp | Gasifying coal in fixed bed ash-slagging gasifier |
-
1983
- 1983-08-25 GB GB838322899A patent/GB8322899D0/en active Pending
-
1984
- 1984-08-10 GB GB848420360A patent/GB8420360D0/en active Pending
- 1984-08-17 DE DE8484305601T patent/DE3474685D1/en not_active Expired
- 1984-08-17 GB GB08421038A patent/GB2146039B/en not_active Expired
- 1984-08-17 EP EP84305601A patent/EP0148554B1/en not_active Expired
- 1984-08-22 ZA ZA846540A patent/ZA846540B/en unknown
- 1984-08-24 CS CS846423A patent/CS265208B2/en unknown
- 1984-08-24 PL PL1984249331A patent/PL145182B1/en unknown
- 1984-08-24 IN IN642/MAS/84A patent/IN162228B/en unknown
- 1984-08-24 NO NO843385A patent/NO843385L/en unknown
- 1984-08-24 JP JP59176539A patent/JPS6076593A/en active Pending
- 1984-08-25 KR KR1019840005162A patent/KR860001121B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CS265208B2 (en) | 1989-10-13 |
| CS642384A2 (en) | 1988-07-15 |
| GB8420360D0 (en) | 1984-09-12 |
| PL249331A1 (en) | 1985-05-07 |
| EP0148554A3 (en) | 1986-01-22 |
| KR850001919A (en) | 1985-04-10 |
| DE3474685D1 (en) | 1988-11-24 |
| GB8322899D0 (en) | 1983-09-28 |
| JPS6076593A (en) | 1985-05-01 |
| GB2146039A (en) | 1985-04-11 |
| GB2146039B (en) | 1987-10-14 |
| NO843385L (en) | 1985-02-26 |
| GB8421038D0 (en) | 1984-09-19 |
| ZA846540B (en) | 1985-03-27 |
| IN162228B (en) | 1988-04-16 |
| EP0148554A2 (en) | 1985-07-17 |
| KR860001121B1 (en) | 1986-08-13 |
| PL145182B1 (en) | 1988-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4157246A (en) | Hydrothermal alkali metal catalyst recovery process | |
| US4159195A (en) | Hydrothermal alkali metal recovery process | |
| US4219338A (en) | Hydrothermal alkali metal recovery process | |
| US4260421A (en) | Cement production from coal conversion residues | |
| US4077778A (en) | Process for the catalytic gasification of coal | |
| US4113615A (en) | Method for obtaining substantially complete removal of phenols from waste water | |
| US4558027A (en) | Catalysts for carbon and coal gasification | |
| US4193771A (en) | Alkali metal recovery from carbonaceous material conversion process | |
| US4266083A (en) | Biomass liquefaction process | |
| US4211646A (en) | Waste water process | |
| EP0024792A2 (en) | A method for producing a methane-lean synthesis gas from petroleum coke | |
| EP0245910A1 (en) | A process for purifying waste water | |
| PL1772446T3 (en) | Process for producing organic compounds from glycerol , the glycerol coming from renewable raw material | |
| EP0148554B1 (en) | Coal gasification process | |
| US4147611A (en) | Regeneration of alkali metal sulfides from alkali metal hydrosulfides | |
| US4137295A (en) | Carbide production using molten metals as heat source | |
| US4556402A (en) | Process of gasifying solid fuels in a moving bed and in a fluidized bed | |
| US4917763A (en) | Method of recovering chemical from spent pulp liquors | |
| US2988573A (en) | Process for producing phenol | |
| NL7907408A (en) | METHOD FOR RECOVERING ENERGY FROM LOW QUALITY FUELS. | |
| US3954596A (en) | Production of low sulfur heavy oil from coal | |
| GB1595622A (en) | Recovery of alkali metal compounds for reuse in a catalytic coal conversion process | |
| US5266189A (en) | Integrated low severity alcohol-base coal liquefaction process | |
| FI70057B (en) | FOERFARANDE FOER BEHANDLING AV SVARTLUT | |
| EP0757046B1 (en) | Molybdenum epoxidation catalyst recovery |
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): BE DE FR IT NL |
|
| 17P | Request for examination filed |
Effective date: 19850614 |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Designated state(s): BE DE FR IT NL |
|
| 17Q | First examination report despatched |
Effective date: 19870803 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE FR IT NL |
|
| ITF | It: translation for a ep patent filed | ||
| REF | Corresponds to: |
Ref document number: 3474685 Country of ref document: DE Date of ref document: 19881124 |
|
| ET | Fr: translation filed | ||
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| BECH | Be: change of holder |
Free format text: 881019 *BRITISH GAS P.L.C. |
|
| ITTA | It: last paid annual fee | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19940711 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19940720 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19940728 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19940831 Year of fee payment: 11 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Effective date: 19950831 |
|
| BERE | Be: lapsed |
Owner name: BRITISH GAS P.L.C. Effective date: 19950831 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19960301 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19960430 |
|
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19960301 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19960501 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |