SU802204A1 - Method of stabilizing aqueous solutions - Google Patents

Description

one

The invention relates to methods for stabilizing aqueous solutions and can be used in water supply, water treatment, water treatment to prevent deposits of mineral salts in pipelines, desalination plants, coolers and other inlay-prone apparatus.

There is a method of stabilization of aqueous solutions, including the processing of their inorganic phosphates: trisodium phosphate, tripolyphosphate, hexametaphosphate p ..

The disadvantage of this method is that with an increase in temperature above 60 ° C, an increase in the pH of the medium and salinity, inorganic phosphates are hydrolyzed, which in turn leads to the formation and deposition of basic calcium phosphate on the surfaces of heat exchange equipment.

There is a method of stabilizing aqueous solutions, which consists in processing them before using them.

complexons having a general formula

R

R

.X

isr-hj-chj-lf

RR

where R CH. (ethylenediaminetetramethylphosphonic acid EDTP) pj.

This method is closest to the invention to the technical essence and the achieved result

The disadvantage of this method is the low efficiency of the treatment of aqueous solutions; The carbonate hardness of the treated solution is 8.14 mEq / L of npiH. concentrations of complexone 2 mg / l and 9.1 at 5 mg / l, and the amount of deposits on the walls is 0.96 mg and 0.37 mg

at appropriate concentrations. In addition, the process is characterized by a high consumption of the reagent used.

The aim of the invention is to increase the degree of stabilization and reduce reagent consumption.

The goal is achieved by the treatment of aqueous solutions with complexones containing together the functional groups of alkanesulfo-, alkoncarboxylic and alkaiphosphonic acids; at the same time, chelating agents are administered in the amount of 2-5 mg / l. The use of chelating agents having the general formula

SiB,

r-CH2-CH2-N

: "4" 3

and jointly containing IR residues of alkanesulfo-, alkancarboic and alkanophosphonic acids, leads to an increase in the efficiency of reagent treatment of aqueous solutions following Comparative data on the effectiveness of stabilization of aqueous pacTBQpoB with Comppexons

the effect of increasing their affinity for ultramicrozirculating crystallizing solid phase.

Example 1. 50 ml of Ca (HCO2) solution are poured into the flasks, and with carbonate hardness of 10 meq / l, the complexones are added as 0.1% solutions. The flasks were thermostatic in a water bath for 2 hours at a temperature of 80 ° C.

The results are presented in table. one.

Table 1

EXAMPLE 2 50 ml of freshly prepared CaSO. Solution prepared by mixing equivalent amounts of calcium chloride and sodium sulfate is poured into the flasks.

The concentration of CaS04 solution is 7.8 g / l, the degree of supersaturation is 160%. Comparative data on the content of Ca504, complexone aqueous solution

R-4-snOON R-f-4-CHiPOaH.a

(prototype)

RlZ-CHiCHiSOjH RJ-H; In -CH,

R-CH-j POjH; RQi-CHj COOH RiACH CH- SO H

Introduced complexones in the form of a 0.1% solution. The resulting mixtures are incubated in a water bath for 2 hours at a temperature of 80 C.

The results are presented in Table. 2

table 2

3.52

7.62 7.80

7.76 g / l, in treated

Claims (2)

Claim 1. Method for stabilization of aqueous solutions, including treatment with complexones from ethylenediamine derivatives, characterized in that, in order to increase the degree of stabilization and reduce reagent consumption, the treatment is carried out with complexones containing together the functional groups of alkanesulpho-, alkanecarboxylic and alka-phosphonic {syllot . Continued table. 2 2. A method according to claim 1, characterized in that the chelating agents are administered in an amount of 2-5 mg / l. Information sources, . taken into account in the examination 1. Klchko V.A. Desalinated water. M., Stroyededat, 1968, p. 43. 2. Patent SZYA 3.893150, 25 cl. 357-17, 01.07.75 (prototype).