EP0077909A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
High consistency-aqueous slurry of powdered coal
Assignee: DKS Co Ltd
•
Filing: 1982-09-13
•
Granted: —
•
Expires: 2002-09-13
Abstract
Abstract There is provided a high consistency-aqueous slurry of powdered coal capable of conveying by a hydraulic pump and combusting as such comprising at least 60% by weight of powdered coal, water and, as a viscosity lowering agent, a polyether compound or a derivative thereof containing at least 10% by weight of oxyethylene units based on the polyoxyalkylene chain thereof.
Inventors
- 👤 Akihiro Naka
- 👤 Shuichi Honjo
- 👤 Tominobu Mayuzumi
- 👤 Yasuharu Tanakamaru
- 👤 Yoshihisa Nishida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 23:14
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/326
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
An aqueous slurry of powdered coal composition having a consistency of at least 60% by weight comprising powdered coal, water and an effective amount of, as a viscosity lowering agent, a polyether compound selected from the group consisting of: (a) an adduct of an active hydrogen compound with a lower alkylene oxide containing at least 10% by weight of oxyethylene units based on the total oxyalkylene chain content; (b) a cross-linked product of said compound a); and (c) a reaction product of said compound a) or b) with an inorganic or organic acylating agent, a halogenating agent, an oxidizing agent or a monoisocyanate; said polyether compound having a molecular weight of at least 1,000.
Claim 2
Dependent Claim
114 words
An aqueous slurry of powdered coal composition having a consistency of at least 60% by weight comprising powdered coal, water and an effective amount of, as a viscosity lowering agent, a polyether compound selected from the group consisting of: (a) an adduct of an active hydrogen compound with a lower alkylene oxide containing at least 10% by weight of oxyethylene units based on the total oxyalkylene chain content; (b) a cross-linked product of said compound a); and (c) a reaction product of said compound a) or b) with an inorganic or organic acylating agent, a halogenating agent, an oxidizing agent or a monoisocyanate; said polyether compound having a molecular weight of at least 1,000.
Claim 3
Dependent Claim
20 words
The composition of Claim 1, wherein said active hydrogen compound has at least one hydroxyl, amino, imino, or carboxylic group.
Claim 4
Dependent Claim
29 words
The composition of Claim 1, wherein said cross-linking agent is a polyisocyanate, a polyepoxy compound, a polyaldehyde, a function derivative of polycarboxylic acid or a free radical-generating peroxide catalyst.
Claim 5
Dependent Claim
19 words
The composition of Claim 1, wherein said reaction product with said acylating agent is a sulfate or phosphate ester.
Claim 6
Dependent Claim
11 words
The composition of Claim 1, wherein said coal is cleaned coal.
Claim 7
Dependent Claim
15 words
The composition of Claim 5, wherein said consistency ranges from 70 to 80% by weight.
Claim 8
Dependent Claim
22 words
The composition of Claim 1, said amount of said polyether compound ranges from 0.01 to 5.0% by weight based on the slurry.
Claim 9
Dependent Claim
23 words
The composition of Claim 7, wherein said amount of said polyether compound ranges from 0.03 to 2.0% by weight based on the slurry.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.