Claims
- 1. A process for treating water to inhibit formation of scale on surfaces contacted by the water, which comprises: mixing in the water an effective amount of a calcium ion capturing agent for chelating the calcium ions contained in the water to prevent deposition of scale on surfaces contacted by the water, said calcium ion capturing agent being an alkali metal salt of a copolymer of maleic acid (MA) and a monomer (AA) selected from the group consisting of acrylic acid and methacrylic acid, wherein the mol ratio (.gamma.) of the monomer units MA/AA is from 1.15 to 2.7, the number average molecular weight (MW) of the copolymer is from 1000 to 8000, and the product of (.gamma.) multiplied by (MW) is at least 3000.
- 2. A process as claimed in claim 1 wherein (MW) is from 1500 to 6000.
- 3. A process as claimed in claim 1 wherein (MW) is from 2000 to 5000.
- 4. A process as claimed in claim 1 wherein the mol ratio (.gamma.) of the monomer units is from 1.3 to 2.6.
- 5. A process as claimed in claim 1 wherein the product of (.gamma.) multiplied by (MW) is from 4000 to 6000.
- 6. A process as claimed in claim 1 in which the water is boiler feed water or circulating water containing calcium ions.
Priority Claims (1)
Number |
Date |
Country |
Kind |
56-55351 |
Apr 1981 |
JPX |
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Parent Case Info
This application is a division, of U.S. Ser. No. 360,518 filed Mar. 22, 1982, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4175066 |
Shibazaki et al. |
Nov 1979 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
360518 |
Mar 1982 |
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