SU842054A1 - Method of producing polyphosphate solutions for stabilizing treatment of water - Google Patents

Description

one

This invention relates to the technology for the stabilization treatment of npONbiiineH and sewage with increased overall hardness and mineralization, in particular, of oil-field wastewater.

The closest in technical essence to the present invention is a method of preparing solutions of polyphosphates for the stabilization treatment of circulating water by dissolving them in fresh water 1.

The disadvantage of this method is the small stabilizing effect of polyphosphates. When the solution is dispensed above 0.08–0.1% of the concentration at the injection site, the process of phosphate softening of water proceeds, causing large losses of phosphate in the form of sludge.

The purpose of the invention is to increase the stabilizing properties of phosphates, increase their stability, storage capabilities, prevent the formation of precipitation in them, as well as save reagents.

The goal is achieved by the fact that, when polyphosphates dissolve, calcium salts are added to the solutions at

weight ratio

  P Poisonous

0.07: 0.23.

In this case, the preparation of polyphosphate solutions is carried out in two stages, with the first preparing a concentrated solution of polyphosphate with a weight ratio in the solution of 0.05-0.07. In addition, when preparing solutions, industrial waters containing calcium salts are used.

When processing industrial water

0 solutions of polyphosphates with the specified ratio achieve a reduction in deposits of mineral salts by about two times compared with the treatment with the same solutions prepared

5 in fresh water.

Solution 1. Dissolve 5 g of sodium polyphosphate containing 62% PdO- (Ca2 + content is 0.06 g / l) in 1 liter of fresh water. Weight ratio Ca: P; iO5 in the resulting solution

0 status is 0.019. At the same time, goto t solution of sodium polyphosphate in the same concentration, in which 0.96 g of CCE was previously dissolved (the content of Ca in the solution was 6.341 g / l, the weight ratio of Ca: P, Oy fHo 0.11).

The indicated solutions with the same; The conditions are treated with model hydroscopic water of the following compound, g / l: NaCI 83, MgCI, 3.8, CaCI 3.33, CaCCHO) 2.6; CaS04 0.54; pH 6.8. In the course of the treatment, 1 ml of paliphosphate solution per 1 liter of mixed water is added, after three hours of mixing samples of industrial water treated with the indicated polyphos-solutions. veil, in closed glass cylinders, the concentration of precipitated c is determined. calcium carbonate precipitate. At. treatment with the solution prepared by the perversion method, the precipitate concentration of CaCO- is 24 mg / l, and when treated with a solution containing calcium salt, the concentration of the precipitate CaCO-j is 12 mg / l. The data on the concentration of precipitated calcium carbonate to the estimated cpotcy of the service of the pipeline in the treatment of industrial water with polyphosphate solutions with different ratios {Ca are given in Table. 1. Water is treated with poly phosphate solutions at a dose of 5 mg / l. table Continued table. 1 Preparation of a polyphosphate solution with the addition of calcium salt with a Ca ratio in the solution of 0.07-0.23 / increases the estimated service life of the pipeline by 1.7-2.2 times compared to the treatment of industrial water with a polyphosphate solution prepared by a known method. Example 2. Calcium chloride (145 g / l) is dissolved in distilled water and by dilution, solutions containing from 1 to 145 g / l CaCBj are obtained. In the resulting solutions, as well as in distilled water, sodium polyphosphate (30 g / l) (in solutions containing from O to 14.5 g / l of Cacae) and 300 g / l (in solutions containing from O to 145 g / l CaCS2) Visual observations were made for 10 days. The results of the observations are given in Table. 2. Table 2

ABOUT

186

26 36

186 186

186

57 88 186

Clear solution

0.05 Same

0.07 The solution dimmed after 5 days

&, P The same after 3 days

0.17 Same, after 1 day precipitate

From the data in Table 2, it follows that dilute solutions of polyphosphates (30 g / l) containing calcium ions with a weight ratio above 0.07 should be stored for no more than 1-2 days. Therefore, working solutions of polyphosphates with an optimal weight ratio of Ca 5 0.07-0.23 it is possible to prepare either in one stage with a shelf life of not more than 1-5 days, or in two stages, and in the first stage a concentrated solution of polyphosphates is prepared with a weight ratio of Ca: O, O5-0; 07. and in the second stage, it is diluted with water containing calcium salts to the optimum weight ratio

0.07-0.23.

penalties a u, u7-u, j. Example 3. Sodium polyphosphate solutions are prepared in promlienium water of the following composition g / l: NaCl 66; СаС1а2,2; MDS1aZ, 3) Ca (HCO-5),

1.73J CaSO4 OJ52; NaBr 0.28, NaJ 0.03. At the same time pH 6,8 density 1,047 r / ct / ft. 19.4 kg of sodium polyphosphate containing 62% PjO are dissolved, and 64 liters of a concentrated solution containing 300 g / l of sodium polyphosphate are obtained (the weight ratio Ca: P2O5 in solution is 0.07). Every day, for 20 days, 3.2 l of this solution is diluted with pro-industrial water, the half-continuation table. 2 43; 0.23 52.4 О О

polyphosphate working solution

5 sodium 10 g / l with a weight ratio of Ca of 0.22. The working solution of polyphosphate is metered in the amount of 4 l / h into the STREAM of industrial water with a flow rate of 8 through pipelines d 55 mm (the water velocity is about

0 I m / s). Manufactured water passes through pipelines with steel samples before supplying the reagent to it and after mixing it with the reagent (polyphosphate working solution). Steel

5 samples weighed before they are installed in pipelines, as well as after 10 and 20 days of their testing in pipelines. The test results show that the weight of sediments (consisting of calcium carbonate) on samples installed in the pipeline after the reagent was supplied is 100- 200 times less than before the supply of the reagent.

five

From Example 3, it can be seen that it is advisable to use the extract water containing calcium salts for preparing solutions of polyphosphates.

Claims (1)

The use of the proposed method makes it possible to double the effect1} of stabilization treatment of industrialized waters, to increase the service life of pipelines 1.7-2.2 times, to ensure the stability of the solutions obtained. ; The solution contains an abundant precipitate suspension containing an abundant precipitate. A clear solution. The invention is L. A method of preparing solutions of polyphosphates for the stabilization treatment of water by dissolving them, characterized in that, in order to increase their stabilizing properties, sol. cal, su qi with a weight ratio equal to 0.07-0.23. 2, a method according to claim 1, characterized in that, in order to increase the stability of the solutions, to store them and prevent the formation of precipitates in them, the preparation of polyphosphate solutions is carried out in two stages, the first being prepared with a concentrated polyphosphate solution the weight ratio of Ca- in the solution is 0.05-0.07. 3. The method according to paragraphs. 1, and 2, about t l and the fact that, in order to save reagents, industrial waters containing calcium salts are used. Sources of information taken into account during the examination 1. Kruschel GE, Education and prevention: rotation of sediments in water cooling systems. M., 1955, p. 174178.