# US 5,348,721 A · Polyaluminumchlorosulfates and preparation and uses thereof

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- Number: US 5,348,721 A
- Document ID: US5348721A
- Status: Granted
- Kind: A
- Application number: 08/018,959
- Filed: 1993-02-18
- Granted: 1994-09-20
- Earliest claimed: 1992-02-18
- Assignees: Elf Atochem S.A.
- Inventors: J. D. Murphy; R. Schuffenecker; H. Suty
- Web page: https://patentgrep.com/patent/US5348721A

## CPC

- D21H 21/10: Retention agents or drainage improvers
- C01F 7/78: Compounds containing aluminium, with or without oxygen or hydrogen, and containing two or more other elements (aluminates C01F7/02; compounds containing aluminium, fluorine and alkali or alkaline earth metals C01F7/54; nitrates containing other cations besides aluminium C01F7/66; sulfides, sulfites or sulfates containing other cations besides aluminium C01F7/70 - C01F7/74)
- C02F 1/5245: {using basic salts, e.g. of aluminium and iron}
- D21H 17/66: Salts, e.g. alums
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)

## Abstract

The invention relates to high basicity polyaluminumchlorosulfates and their preparation process, said polyaluminumchlorosulfates being useful in the treatment of drinking water, aqueous effluents, and in the papermaking industry and having the formula: Al(OH).sub.a Cl.sub.b (SO.sub.4).sub.c M.sub.d N.sub.e in which: M is an alkaline-earth metal; N is an alkaline metal; a, b, c, d and e are numbers such that: 1.95<a<2.4; 0<c<0.15; 0<d<0.16; 0<e<1.7; a+b+2c=3+2d+e.

## Claims

### Claim 1

High basicity water-soluble polyaluminumchlorosulfate, yielding a content of polymeric aluminum as Al.sub.13 of at least 1 mol % when said polyaluminumchlorosulfate is dissolved in water to form a solution which has an aluminum concentration of 0.01M and having the formula:
Al(OH).sub.a Cl.sub.b (SO.sub.4).sub.c M.sub.d N.sub.e
in which:
M is an alkaline-earth metal;
N is an alkali metal;
a, b, c, d and e are numbers such that:
1.95<a<2.4; 0<c<0.15; 0<d<0.16;
0.4<e<1.7; and a+b+2c=3+2d+e.

### Claim 2 (depends on 1)

Polyaluminumchlorosulfate according to claim 1, in which M is calcium.

### Claim 3 (depends on 1)

Polyaluminumchlorosulfate according to claim 1, in which N is sodium.

### Claim 4 (depends on 1, 2, 3)

Polyaluminumchlorosulfate according to one of claims 1 to 3, in which:
2.05<a<2.25; 0.04<c<0.06; 0.1<d<0.13; 0.4<e<0.8.

### Claim 5 (depends on 4)

Polyaluminumchlorosulfate according to claim 4, having a basicity higher than 67%.

### Claim 6 (depends on 5)

Polyaluminiumchlorsulfate according to claim 5 having a basicity higher that 72%.

### Claim 7 (depends on 1)

Polyaluminumchlorosulfate according to claim 1, having a basicity higher than 67%.

### Claim 8 (depends on 1)

Polyaluminumchlorosulfate according to claim 1, having a content of aluminum as Al.sub.13 higher than 1 mol % for an Al concentration of 0.06M.

### Claim 9 (depends on 1)

Polyaluminumchlorosulfate according to claim 1, yielding a content of polymeric aluminum as Al.sub.13 of at least 3 mol % when said polyaluminimchlorosulfate is dissolved in water to form a solution which has an aluminum concentration of 0.01M.

### Claim 10 (depends on 1)

Polyaluminumchlorosulfate according to claim 1, having a basicity of higher than 72%.

### Claim 11

A process for prepartin a high basicity water-soluble polyaluminumchlorosulfate, yielding a content of polymeric aluminum as Al.sub.13 of at least 1 mol % when said polyaluminimchlorosulfate is dissolved in water to form a solution which has an aluminum concentration of 0.01M and having the formula:
Al(OH).sub.a Cl.sub.b (SO.sub.4).sub.c M.sub.d N.sub.e
in which:
M is an alkaline-earth metal;
N is an alkali metal;
a, b, c, d and e are numbers such that:
1.95<a<2.4; 0<c<0.15; 0<d<0.16;
0.4<e<1.7; and a+b+2c=3+2d+e;
comprising reacting, at a temperature of 50.degree. to 70 .degree. C. an alkaline-earth metal compound M and an alkali metal compound N with a polyaluminumchlorosulfate of the formula:
Al(OH).sub.a,Cl.sub.b,(SO.sub.4).sub.c,
in which:
1<a'<1.95; 0<c'<0.15;
a'+b'+2c'=3;
in the following proportion, calculated in molecular equivalents:
0<M/Al<0.16 and 0.4<N/Al<1.7.

### Claim 12 (depends on 11)

A process according to claim 11, in which the temperature is between 60.degree. and 65.degree. C.

### Claim 13 (depends on 11)

A process according to claim 11, in which the alkaline-earth metal compound is a calcium compound.

### Claim 14 (depends on 13)

A process according to claim 13 in which the calcium compound is selected form the group consisting of Ca(OH).sub.2, CaCO.sub.3 and mixtures thereof.

### Claim 15 (depends on 11)

A process according to claim 11, in which the alkali metal is a sodium compound.

### Claim 16 (depends on 15)

A process according to claim 15 in which the sodium compound is Na.sub.2 CO.sub.3.

### Claim 17 (depends on 11)

A process according to claim 11, in which:
1.1<a'<1.4; 0.04<c'<0.06; and 0.1<M/Al<0.13 and 0.4<N/Al<0.8.

### Claim 18 (depends on 11, 12, 13, 14, 15, 16, 17)

A process according to one of claims 11 to 17, in which the polyaluminumchlorosulfate of formula Al(OH).sub.a,Cl.sub.b,(SO.sub.4).sub.c, is obtained by the process that comprises reacting basic aluminum chloride with basic aluminium sulfate, both previously heated, at a temperature between 80.degree. and 120.degree. C., the relative proportions of the constituents being chosen so that polyaluminumchlorosulfate of the abovementioned formula Al(OH).sub.a,Cl.sub.b,(SO.sub.4).sub.c, is obtained.

### Claim 19 (depends on 11, 12, 13, 14, 15, 16, 17)

A process according to one of claims 11 to 17, in which the polyaluminumchlorosulfate of formula Al(OH).sub.a,Cl.sub.b,(SO.sub.4).sub.c, is obtained by the process that comprises reacting basic aluminum chloride with sulfuric acid at a temperature between 60.degree. and 120.degree. C., the relative proportions of the constituents being chosen so that polyaluminumchlorosulfate of the formula Al(OH).sub.a,Cl.sub.b,(SO.sub.4).sub.c, above is obtained.

### Claim 20 (depends on 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)

A method of coagulating and flocculating impurities in papermaking effluent that comprises contacting said effluent with a polyaluminumchlorosulfate as defined in one of claims 1 to 12.

### Claim 21 (depends on 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)

A method of rendering water potable that comprises coagulating and flocculating impurities in water intended for drinking with a polyaluminumchlorosulfate as defined in one of claims 1 to 12 and subsequently separating the water from said coagulated and flocculated impurities.