| 摘要 |
1,210,534. Boiler water treatment. BETZ LABORATORIES Inc. 3 Nov., 1967 [3 Nov., 1966], No. 50064/67. Heading C1C. A composition for treating Ca and Mgcontaining boiler water comprises a precipitating-agent, an adsorbent and an acid having a dissociation constant of 3-8. Precipitants are phosphates, carbonates and silicates. The preferred acids are triglycollamic acid, oxalic acid, ethylenediaminetetraacetic acid and citric acid. Adsorbents are lignosulphonate, lignin, tannin, starch, mannuronate salt, alginate salt, agaragar and polyelectrolytes of mol. weight 5000- 15,000,000 containing the group where R represents nitrile, amide, carboxyl or carboxyl alkyl, or a water-soluble salt of such a polyelectrolyte. |
