US 5,690,704 A · Additive for carbonaceous solid-water slurry, method for production thereof, and carbonaceous solid-water slurry compositions

Abstract

An additive for a carbonaceous solid-water slurry which excels preeminently in the ability to disperse a finely powdered carbonaceous solid in water and, when used only in a small amount, permits production of a carbonaceous solid-water slurry which possesses high concentration, exhibits high fluidity, and precludes change of viscosity due to aging, a method for the production of the additive, and a slurry composition are provided. The additive to be used for high concentration of carbonaceous solid-water slurry comprises a specific water-soluble copolymer and contains a low molecular copolymer (a) having a weight weight-average molecular weight in a range or from 1000 to 39000 and specific ratios of adsorption relative to a carbonaceous solid and a clayish mineral and a high molecular copolymer (b) having a weight weight-average molecular weight of not less than 40000 and specific ratios of adsorption relative to a carbonaceous solid and a clayish mineral at a weight ratio, (a)/(b), in the range of from 10/90 to 99/1, the met hod is for the production of the additive, and the slurry composition is produced by the incorporation of the additive.

An additive for a high concentration carbonaceous solid-water slurry comprising a copolymer (a) and a copolymer (b) selected from the group of water-soluble copolymers obtained by polymerizing the monomer components,

(A) from 0.2 to 20 mol % of a nonionic monomer represented by the formula (I):
##STR10## wherein R.sup.1 stands for --CH.sub.2 --, --(CH.sub.2).sub.2 --, --(CH.sub.2).sub.3 --, --C(CH.sub.3).sub.2 --, --CO, CH.sub.2 CO--,
A.sup.1, A.sup.2, and A.sup.3 independently stand for a hydrogen atom or a methyl group where R.sup.1 is --CH.sub.2 --, --(CH.sub.2).sub.2 --, --(CH.sub.2).sub.3 --, or --C(CH.sub.3).sub.2 -- or A.sup.1 and A.sup.2 independently stand for a hydrogen atom, a methyl group, or --COOX and A.sup.1 and A.sup.2 do not simultaneously stand for --COOX and A.sup.3 stands for a hydrogen atom, a methyl group, --COOX, or CH.sub.2 COOX
where
R.sup.1 is CO or
--CH.sub.2 CO and A.sup.1 and A.sup.2 independently stand for a hydrogen atom or a methyl group where A.sup.3 is --COOX or --CH.sub.2 COOX, wherein X stands for a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an ammonium group, or an organic amine group
R.sup.2 stands for an alkylene group of 2 to 4 carbon atoms,
n stands for a number of an average in the range of from 1 to 100,
R.sup.3 stands for an alkyl group of 1 to 30 carbon atoms, an alkenyl group, an aryl group, an aralkyl group, a cyclic alkyl group, or a cyclic alkenyl group, or a monovalent organic group derived from a heterocyclic compound,
(B) from 50 to 99.8 mol % of at least one anionic monomer selected from the group consisting of (B-1) an unsaturated carboxylic acid monomer represented by the formula (II):
##STR11## wherein R.sup.4 and R.sup.5 independently stand for a hydrogen atom, a methyl group, or --COOM and R.sup.4 and R.sup.5 do not simultaneously stand for --COOM,
R.sup.6 stands for a hydrogen atom, a methyl group, or --CH.sub.2 COOM, providing that R.sup.4 and
R.sup.5 independently stand for a hydrogen atom or methyl group where R.sup.6 is --CH.sub.2 COOM, and
M stands for a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an ammonium group, or an organic amine group and (B-2) a sulfoalkyl(meth)acrylate type monomer represented by the formula (III):
##STR12## wherein R.sup.7 stands for a hydrogen atom or a methyl group, Z stands for an alkylene group of 1 to 4 carbon atoms, and
Y stands for a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an ammonium group, or an organic amine group, and
(C) from 0 to 49.8 mol % of an other monomer co-polymerizable with any of the monomers (A), (B-1), or (B-2), selected from the group consisting of:
methacrylic acid alkyl esters;
vinyl sulfonic acid, styrene sulfonic acid, allyl sulfonic acid, methallyl sulfonic acid, and 2-acrylamide-2-methylpropane sulfonic acid, and the monovalent metal salts, divalent metal salts, ammonium salts, and organic amine salts of the said acids;
hydroxyl group containing (meth)acrylates;
(meth)acrylamides;
styrene and p-methyl styrene;
vinyl acetate, propenyl acetate;
and vinyl chloride;
and mixtures thereof,
provided the total of the monomers of (A), (B-1), (B-2), and (C) is 100 mol % wherein said copolymer
(a) is a water soluble low molecular copolymer made from 0.2 to 20 mol % of the nonionic monomer (A), 50 to 99.8 mol % of at least one anionic monomer (B), and 0 to 49.8 mol % of the other monomer (C), having a weight-average molecular weight in a range of from 1000 to 39000, an adsorption ratio relative to carbonaceous solids in a range of from 5 to 50%, and an adsorption ratio relative to clayish mineral particles in the range of from 5 to 40% and said copolymer
(b) is a water soluble high molecular copolymer made from 0.2 to 20 mol % of the nonionic monomer (A), 50 to 99.8 mol % of at least one anionic monomer (B), and 0 to 49.8 mol % of the other monomer (C), having a weight-average molecular weight in a range not less than 40000, an adsorption ratio relative to carbonaceous solids in a range not less than 50%, and an adsorption ratio relative to clayish mineral particles in a range not less than 40% at a weight ratio, (a)/(b), in the range of from 10/90 to 99/1.

25 more elements

Additive for carbonaceous solid-water slurry, method for production thereof, and carbonaceous solid-water slurry compositions

Life of this patent

Additive for carbonaceous solid-water slurry, method for production thereof, and carbonaceous solid-water slurry compositions

Life of this patent

Abstract

Claims11