EP0200074B1 - Stabilizer for aqueous suspensions - Google Patents
Stabilizer for aqueous suspensions Download PDFInfo
- Publication number
- EP0200074B1 EP0200074B1 EP86105103A EP86105103A EP0200074B1 EP 0200074 B1 EP0200074 B1 EP 0200074B1 EP 86105103 A EP86105103 A EP 86105103A EP 86105103 A EP86105103 A EP 86105103A EP 0200074 B1 EP0200074 B1 EP 0200074B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pet
- coke
- bentonite
- stabilizer
- weight
- 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 - Lifetime
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
Definitions
- the present invention relates to a composition
- a composition comprising an aqueous suspension of pet-coke and an stabilizer.
- Pet-coke is a high heat value product with low content of ashes, and a great interest exists hence in converting said pet-coke into a fluid product by dispersing it in liquids, in particular in water.
- the aqueous suspensions of pet-coke can be stabilized by adding to them bentonite in amounts comprised within the range of from 0.2 to 3% by weight relatively to the weight of the suspension.
- the concentration of pet-coke in water it is usually comprised within the range of from 50% to 80% by weight.
- the composition contains, in addition to the aqueous suspension of pet-coke and to the bentonite, normal fluidifiers, in particular those obtained by the sulphonation and salifying of coal tar, and possible condensation with formaldehyde, or the non-surfactant anionic polyelectrolytes, in particular those having alkyl-substituted polynuclear aromatic groups and having a molecular weight higher than 300 and preferably comprised within the range of from 500 to 3000.
- normal fluidifiers in particular those obtained by the sulphonation and salifying of coal tar, and possible condensation with formaldehyde
- non-surfactant anionic polyelectrolytes in particular those having alkyl-substituted polynuclear aromatic groups and having a molecular weight higher than 300 and preferably comprised within the range of from 500 to 3000.
- the granulometry of pet-coke in the aqueous suspension is such as to have particles of size lower than 300 1 1m, and preferably the suspension is formed by two groups of particles of different average size, the first group of particles having an average size between 210 11m and 60 11m, whilst the par- tides of the second group have an average size comprised between 1/6 and 1/20 of the average size of the particles of the first group.
- the particles of the first group are at least 50% and up to 80% by weight of the total of the particles.
- the bentonite is added to the fluidifier-containing pet-coke in the step of pet-coke grinding, or in the step of mixing with water and additives.
- the process in case of a continuous-type granulometry of the particles of pet-coke, the process is carried out as described above, with the exception of the fact that the grinding is carried out under wet and not dry conditions.
- the bentonite can be added either during the wet grinding step in which the coarser fractions are produced, or, preferably, during the wet grinding during which the finer (micronized) fraction is produced.
- a rod mill In order to obtain the coarser fraction, a rod mill is generally used, whilst to obtain the finer fraction a ball micronizer is used.
- the end particle sizes of the two pet-coke fractions are those as above mentioned.
- the wet milling to obtain the coarser fraction is preferably carried out by mixing the raw pet-coke to be ground with the wet-micronized fraction, continuining the grinding, until the size desired for the coarse fraction is reached. This is the grinding process adopted in Examples 2 and 3.
- a slurry has been prepared with the coarse fraction and the micronized fraction, in the weight ratio of 65/35 at a concentration of pet-coke of 72.0% by weight, and with an amount of DAXAD 15 of 0.5%. Bentonite has been metered into it in the amounts of respectively 0%, 1.0%, 1.5%, 2.0%, 2.5%.
- the values of stability, as % after 48 hours, for the five cases, are respectively 91.0; 96.0; 98.5; 99; 99.5.
- the determination of the static stability is carried out by pouring the coal suspension into a 170x24 mm plexiglas cylinder and keeping it resting for a determined time at constant temperature.
- the cylinder is introduced in a freezer to cause the suspension to solidify.
- the 150-mm high core is thex extracted from the cylinder and from its ends two samples of about 15 mm of height are drawn.
- the two samples are then analyzed for the determination of the content of solids.
- the % ratio of the solids content found in the top sample to that of the bottom sample allows to calculate the stability.
- the static stability is expressed by a number comprised between 0 and 100.
- the pet-coke used was that of Example 1.
- the wet-micronization has been carried out at a concentration of 50% of solids, with an amount of DAXAD 15 corresponding to the concentration of 0.5%, as referred to the end rod milling.
- the coarse/fine ratio in the end rod milling has been 65/35.
- the end concentration of pet-coke has been of 71% by weight.
- the pet-coke used was that of Example 1.
- the whole amount of fluidifier additive DAXAD 15 has been added in the micronization step, so as to obtain in the end rod milling a concentration of 0.5%.
- the bentonite amounts above listed correspond to 0%, 0.05%, 0.10%, 0.15%, 0.25%. 0.35%. 0.45% in the end product.
- the concentration of pet-coke in the end product has resulted around 71 %.
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Liquid Carbonaceous Fuels (AREA)
- Industrial Gases (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Coke Industry (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2045685 | 1985-04-23 | ||
IT20456/85A IT1187660B (it) | 1985-04-23 | 1985-04-23 | Stabilizzante di sospensioni acquose |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0200074A2 EP0200074A2 (en) | 1986-11-05 |
EP0200074A3 EP0200074A3 (en) | 1987-11-04 |
EP0200074B1 true EP0200074B1 (en) | 1990-02-07 |
Family
ID=11167220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86105103A Expired - Lifetime EP0200074B1 (en) | 1985-04-23 | 1986-04-14 | Stabilizer for aqueous suspensions |
Country Status (14)
Country | Link |
---|---|
EP (1) | EP0200074B1 (ja) |
JP (1) | JPH068420B2 (ja) |
AU (1) | AU587610B2 (ja) |
BR (1) | BR8601992A (ja) |
DD (1) | DD244561A5 (ja) |
DE (1) | DE3668908D1 (ja) |
ES (1) | ES8802578A1 (ja) |
FI (1) | FI861554A (ja) |
GR (1) | GR860933B (ja) |
IN (1) | IN167190B (ja) |
IT (1) | IT1187660B (ja) |
NO (1) | NO861561L (ja) |
SU (1) | SU1731065A3 (ja) |
ZA (1) | ZA862533B (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4282922A (en) * | 1980-05-16 | 1981-08-11 | E. I. Du Pont De Nemours And Company | Lead coated alumina fiber and lead matrix composites thereof |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4062694A (en) * | 1975-07-14 | 1977-12-13 | International Telephone And Telegraph Corporation | Stable particulate suspensions |
US4251230A (en) * | 1978-10-26 | 1981-02-17 | International Telephone And Telegraph Corporation | Coal suspensions in organic liquids |
US4375358A (en) * | 1980-09-02 | 1983-03-01 | Conoco Inc. | Fuel slurries of solid carbonaceous material in water |
US4505716A (en) * | 1984-02-15 | 1985-03-19 | Itt Corporation | Combustible coal/water mixture for fuels and methods of preparing same |
-
1985
- 1985-04-23 IT IT20456/85A patent/IT1187660B/it active
-
1986
- 1986-04-04 ZA ZA862533A patent/ZA862533B/xx unknown
- 1986-04-08 IN IN256/MAS/86A patent/IN167190B/en unknown
- 1986-04-09 GR GR860933A patent/GR860933B/el unknown
- 1986-04-11 AU AU55990/86A patent/AU587610B2/en not_active Ceased
- 1986-04-14 FI FI861554A patent/FI861554A/fi not_active Application Discontinuation
- 1986-04-14 DE DE8686105103T patent/DE3668908D1/de not_active Expired - Fee Related
- 1986-04-14 EP EP86105103A patent/EP0200074B1/en not_active Expired - Lifetime
- 1986-04-18 BR BR8601992A patent/BR8601992A/pt unknown
- 1986-04-21 NO NO861561A patent/NO861561L/no unknown
- 1986-04-21 DD DD86289444A patent/DD244561A5/de not_active IP Right Cessation
- 1986-04-22 SU SU864027314A patent/SU1731065A3/ru active
- 1986-04-22 ES ES554668A patent/ES8802578A1/es not_active Expired
- 1986-04-23 JP JP61092434A patent/JPH068420B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
AU5599086A (en) | 1986-10-30 |
FI861554A (fi) | 1986-10-24 |
DE3668908D1 (de) | 1990-03-15 |
EP0200074A2 (en) | 1986-11-05 |
GR860933B (en) | 1986-07-01 |
DD244561A5 (de) | 1987-04-08 |
NO861561L (no) | 1986-10-24 |
IN167190B (ja) | 1990-09-15 |
IT1187660B (it) | 1987-12-23 |
SU1731065A3 (ru) | 1992-04-30 |
EP0200074A3 (en) | 1987-11-04 |
BR8601992A (pt) | 1987-01-06 |
FI861554A0 (fi) | 1986-04-14 |
ES8802578A1 (es) | 1987-07-01 |
AU587610B2 (en) | 1989-08-24 |
ES554668A0 (es) | 1987-07-01 |
JPH068420B2 (ja) | 1994-02-02 |
JPS61247794A (ja) | 1986-11-05 |
IT8520456A0 (it) | 1985-04-23 |
ZA862533B (en) | 1986-11-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3989195A (en) | Production of aqueous calcium carbonate suspensions | |
EP0108767B1 (en) | A process for producing a slurry of a pulverized carbonaceous material | |
EP0259348A4 (en) | METHOD FOR INFLUENCING CARBON AGGLOMERATION TIME. | |
CA1188517A (en) | Aqueous phase continuous, coal fuel slurry and a method of its production | |
EP0200074B1 (en) | Stabilizer for aqueous suspensions | |
US4498906A (en) | Coal-water fuel slurries and process for making | |
US4938983A (en) | Stable suspensions of solid particulates in aqueous media | |
US4130401A (en) | Combustible and mobile fuel slurry and method of preparing same | |
US4118245A (en) | Method for producing clay slurries | |
CA1191684A (en) | Coal-water fuel slurries and process for making same | |
WO1985001060A1 (en) | Process for preparing a carbonaceous slurry | |
US4756720A (en) | Process for producing a high concentration coal-water slurry | |
US4749381A (en) | Stable slurries of solid carbonaceous fuel and water | |
EP0126442B1 (en) | Coal-aqueous mixtures having a particular coal particle size distribution | |
KR900005100B1 (ko) | 고체연료-물슬러리 혼합물 및 그 제조방법 | |
US4592760A (en) | Coal slurry | |
US4530701A (en) | Process of manufacturing a co-fuel additive with combustion-modifying effects | |
EP0325309B1 (en) | Method for preparing a high-concentration solids suspension in water | |
SU1530099A3 (ru) | Способ получени высококонцентрированных водоугольных суспензий | |
JPH0349318B2 (ja) | ||
EP0165350B1 (en) | Process for producing a high concentration coal-water slurry | |
JPS641518B2 (ja) | ||
EP0109740A2 (en) | Combustible compositions containing coal, water and surfactant | |
EP0244902A2 (en) | Aqueous slurry of coal and related preparation processes | |
KR960003669B1 (ko) | 분산염료의 저장안정성 액체 제형 및 그의 제조방법 |
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 |
Kind code of ref document: A2 Designated state(s): DE FR GB NL SE |
|
PUAB | Information related to the publication of an a document modified or deleted |
Free format text: ORIGINAL CODE: 0009199EPPU |
|
RA1 | Application published (corrected) |
Date of ref document: 19861210 Kind code of ref document: A2 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE FR GB NL SE |
|
17P | Request for examination filed |
Effective date: 19880208 |
|
17Q | First examination report despatched |
Effective date: 19881227 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19900207 Ref country code: NL Effective date: 19900207 |
|
ET | Fr: translation filed | ||
REF | Corresponds to: |
Ref document number: 3668908 Country of ref document: DE Date of ref document: 19900315 |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
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 | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19980320 Year of fee payment: 13 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19980327 Year of fee payment: 13 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19980424 Year of fee payment: 13 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990414 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19990414 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19991231 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000201 |