SU1761693A1 - Method for inhibition of salt deposits - Google Patents

Abstract

Use: metallurgical industry, water supply, water treatment. SUMMARY OF THE INVENTION: To prevent scaling, a composition containing, in wt%, is introduced into water: hydrolyzed copolymer of acrylonitrile, methacrylic acid and itaconic acid 0.5-2.0 aminocaproic N, N-dimethylene-phosphonic acid 1.0-4, 0 and water - the rest. The use of the composition makes it possible to increase the effectiveness of preventing CaCO3 deposits by 22-32%, to reduce the consumption of reagents by 17% to reduce the content of suspended substances in the treated water. 3 tab.

Description

The invention relates to compositions for the prevention of deposits of mineral salts and can be used in the metallurgical industry, as well as in water supply and water treatment.

The closest to the proposed technical essence is a composition for the inhibition of scaling, including a hydrolyzed water-soluble acrylic copolymer, methacrylic acid copolymer and 2-acrylamide-2 methylpropylsulphoalkyl or 2 methacrylamino-2-methylpropyl-sulfonic acids, and as an anionic surfactant, octene signal, octoglopene, 2-methacrylamino-2-methylpropyl sulfonic acid, and as an anionic surfactant, 2 octane signal, octogene sulfonate, 2 methacrylamino-2-methylpropyl sulfonic acid, and as an anionic surfactant, 2 octane signal, octopone sulfonate, 2 methacrylamino-2-methylpropyl sulfonic acid, and as an anionic surfactant 2 octane signal, octclenome sulfonate, 2 methacrylamino-2-methylpropyl sulfonic acid, and an anionic surfactant octylene cell octaccrylamino-2-methylpropyl sulfonic acid; sodium salt.

The disadvantage of this composition is low inhibiting ability, high cost and high consumption of initial reagents.

The aim of the invention is to increase the inhibitory ability of the composition and reduce its consumption.

The composition for inhibiting scaling contains hydrolyzed copolymer of acrylonitrile, methacrylic and itaconic acids, aminocaproic-N.N-dimethylene-phosphonic acid and water in the following ratio, wt.%: Hydrolyzed acrylonitrile copolymer, methacrylic and itaconic acids

0.5-2.0

aminocapronone - N, N -dimeti (L

WITH

Xi on

OS Yu CJ

Lenphosphonic acid1, 0-4.0 water the rest The hydrolyzed copolymer of acrylonitrile, methacrylic acid and itaconic acid (GSAMIC), obtained at a ratio of monomers of 96: 6: 2, is a pasty substance, well soluble in water.

Aminocaproic N, N-dimethylene phosphonic acid is obtained by phosphorylation of caprolactam in an aqueous medium by the interaction of formaldehyde and phosphorus trichloride and aminocaproic acid, which is formed in this medium.

155.7 kg of 31.6% hydrochloric acid, 88.1 kg (0.78 kg-mol) of caprolactam are loaded into an enamelled reactor equipped with a reflux condenser and a stirrer and stirred at 50 ° C for 3 hours, In water, 218.8 kg (1.58 kg-mol) of phosphorus trichloride and 126.5 kg (1.55 kg-mol) of 37% formalin. The temperature of the reaction mixture is gradually raised to 100 ° C and kept at 1 00-105 ° C for 8 hours (the ratio of caprolactam: phosphorus trichloride: formalin 1: 2: 2). The released hydrogen chloride is collected in a scrubber. After the phosphorylation reaction is complete, the contents in the reactor are cooled to 50 ° C and 282.7 kg of 43% sodium hydroxide are continuously added at this temperature. The result is 1000 kg of a 30% aqueous solution of the sodium salt of aminocaproic N, N -dimethylene phosphonic acid, conventionally called ROS. The product yield is 94%, the pH of the solution is in the range of 3.5-5.0.

Example 1. To obtain a composition of 5.0 10% HLAMA (based on a dry product of 0.5%), 6.6 kg of 30% AFA (based on a dry product of 2%) and 88.4 kg of water load into a stainless steel tank and mix with compressed air. A 2.5% salinity inhibitor solution is obtained.

The composition is used by introducing it into the circulating water, varying the feed rate depending on the flow of circulating water.

Example 2. Tests of a scale inhibitor are carried out on the circulating water of the sinter production plant of a metallurgical combine.

The composition is administered in the amount of 2.5 mg / l of circulating water. The ratio of the components of the composition of GSAMIC: ROS in terms of 100% substance is 1: 4.

Table 1 presents the characteristics of the initial circulating water and water after the inhibitor is introduced into it.

The inhibitory effect of the composition is determined by the gravimetric method - by changing

the weight of the plates lowered into the settling trays for 12 days.

The rate of deposition using the inhibitor is

0.0205 m / year, without inhibitor - 2.57 mm / year. Table 2 presents the results on the inhibitory capacity of the composition depending on the ratio of its constituent components.

Example 3. Purification is subjected to circulating and off-balance waters of agro-production, containing suspended substances in the amount of 5-7 g / l. The proposed composition is added to wastewater in the amount of 2.5 mg / l, after which it is settled.

Table 3 presents data on the time of clarification of wastewater to a suspension concentration of 0.05 g / l, depending on the ratio of the components of the composition (according to table 2)

The use of the proposed composition in the treatment of water allows to increase the effectiveness of preventing carbonate deposits by 22-32% while maintaining a high degree of prevention of calcium sulfate deposits, reduce reagent consumption by 17%, and reduce the suspended matter content in the treated water.

Claims (1)

The claims Composition for inhibiting scaling comprising hydrolyzed acrylate copolymer plate, characterized in that, in order to increase the ability of the composition and inhibiting reduction of its flow, as it contains the acrylate copolymer hydrolyzed acrylonitrile copolymer, methacrylic and itaconic acid and additionally aminocaproic M , M-dimethylene phosphonic acid and water in the following ratio of components, May. %: hydrolyzed copolymer of acrylonitrile, methacrylic and itaconic acids 0,5-2,0; aminocapronate M. dimethylenephosphonic acid 1, 0-4.0; water the rest Table 1 table 2 Table 3