SU1719322A1 - Method of preventing scale formation - Google Patents

Abstract

The invention relates to methods for treating water, can be used in the preparation of seawater for evaporation plants and in cooling systems for circulating water supply and improves the effectiveness of preventing the formation of scale. As inhibitors, histidine mono- or dihydrochloride is used, which is introduced into water in an amount of 2-2.5 Yu 3 mol / L. The use of histidine chlorohydrates makes it possible to increase the effectiveness of the prevention of salt deposits by 50-53% and to exclude the ingress of toxic components into the system. 4 tab.

Description

The invention relates to water treatment methods and can be used in the preparation of seawater for evaporation plants and in cooling systems for circulating water supply.

The purpose of the invention is to increase the degree of prevention of scale.

To prevent scale, mon or histidine dihydrochloride is introduced into the water. The reagents are introduced in the amount of (2-2.5) -10 mol / l.

To determine the effectiveness of the prevention of deposits, the reagent is introduced into the test water and the resulting solutions are thermostated in 250 mm tanks at 95 ° C to 5-6 times evaporation. As the solutions are evaporated, the liquid is added.

The hardness salts that were separated out after evaporation were dissolved in 0.1N. NA and complexometric method determine their content.

The effectiveness of the prevention of scale formation is calculated by the formula:

  -choo

v-ref about.

where Cx is the content of hardness salts in the sample solution after the experiment with the inhibitor;

Co is the content of hardness salts in the solution after the experiment without an inhibitor;

Sikh - the content of hardness salts in the initial solution.

 Etc. i-me r 1. To 500 ml of seawater with a salinity of 20,000 mg / l, total hardness 66 mEq / l, sulphate ion content 350 mg / l, ion chloride 6,500 mg / l, pH 8.5 add 0.191 g of histidine monochlorohydrate and thermostatically controlled at 95 ° C until evaporated five times. Scale formation prevention efficiency of 97.8%.

Example 2. To 500 ml of tap water with a salinity of 470 mg / l, total hardness of 5.9 mg-eq / l, content of sulfate ions 205 mg / l, chloride of ions 35.5 mg / l, pH 8 add 0.191 g of monohydrochloride histidine and thermostatic at 95 ° C until evaporation six times. Effective u

98.5% scale prevention rate.

In tab. Table 1-4 shows the results on the effectiveness of preventing sediments depending on the amount of reagent added in tap water using histidine monochlorohydrate (Table 1) and histidine dihydrochloride (Table 2) and in sea water using histidine monochlorohydrate (Table 3) and dichlorohydrate histidine (Table 4).

Use as scale inhibitors of mono- and dihydrochloride

Histidine makes it possible to increase the effectiveness of the prevention of salt deposits by 50–53% and to eliminate the ingress of toxic components into the system.

Claims (1)

Claims of the method of preventing the formation of scale, including the introduction of an amino acid derivative, characterized in that, in order to increase the degree of prevention of scale, a histidine monohydrochloride or dihydrochloride is used as the amino acid derivative. Table 1 table 2 Table 3 Table 4