Salt-production scale inhibitor and application thereof

Abstract

The invention discloses a salt-production scale inhibitor. Specifically, the salt-production scale inhibitor is prepared from organic phosphonic acid (or organic phosphonate), a terpolymer, a phosphono carboxylic acid copolymer, a unary polymer, caustic soda flakes and deionized water, wherein the phosphono carboxylic acid copolymer has both carboxylic acid groups and phosphonic acid groups, the terpolymer can be a carboxylate-sulfonate-nonionic copolymer with the molecular weight being 3000-5000, and the unary polymer can be one or a combination of polyacrylic acid and hydrolyzed polymaleic anhydride. According to the salt-production scale inhibitor provided by the invention, monomers have good synergism, the efficient chelating scale-inhibition effect of organophosphorus, and the high thermal-stability and good dispersion effect of the polymers are achieved, the chlorine resistance is high, and the chemical stability is good; when the using concentration is 10-20 mg / L, the salt-production scale inhibitor shows good scale inhibition and scale removal performance on salts such as calcium sulfate and calcium carbonate, which are liable to form scale; the salt-production scale inhibitor is wide in application range, the service cycle of equipment can be effectively prolonged, and the production efficiency is improved.

Description

technical field

[0001] The invention relates to the field of scale inhibitors and dispersants, in particular to a salt-making scale inhibitor and its application. technical background

[0002] Most brine salt production processes use brine purification to remove calcium and magnesium ions in the original brine, but it is impossible to completely remove them. A certain amount of calcium and magnesium ions still remain in the purified brine. In the subsequent evaporation process, as the brine The continuous evaporation and concentration of brine will increase the concentration of calcium and magnesium ions in the brine, and scale deposits will easily form in the evaporation tank and heating chamber, which will directly lead to a decrease in heat transfer rate, an increase in process energy consumption, and a shortened production cycle. In addition, due to the high salt content of brine, a large amount of deposits and scales will be formed on the surface of the pipeline during ...

Examples

Embodiment 1

[0018] Salt-making antiscaling agent, the mass percentages of effective components of each substance are: 5% of 1,6-hexamethylenetriaminepentamethylenephosphonic acid, 8% of diethylenetriaminepentamethylenephosphonic acid heptasodium salt, carboxylic acid Salt-sulfonate-nonionic terpolymer 2%, phosphonocarboxylic acid copolymer 2%, sodium polyacrylate 12%, caustic soda 2.8%, deionized water 68.2%.

[0019] Among them, the carboxylate-sulfonate-nonionic terpolymer is composed of monomer acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and hydroxypropyl acrylate in a mass ratio of 12.5:6:1 at 90 It is prepared by polymerization at ℃, and the viscosity-average molecular weight is 4300.

[0020] The antiscalant was applied to a salt field in Huainan, and the system could continue to operate for more than 10 months when used at a concentration of 20mg / L, and the antiscalant effect was obvious.

Embodiment 2

[0022] Salt-making antiscaling agent, the mass percentages of effective components of each substance are: 7% of 1,6-hexamethylenetriaminepentamethylenephosphonic acid, 5% of heptasodium diethylenetriaminepentamethylenephosphonic acid, 5% of ethylene diaminepentamethylenephosphonic acid Sodium amine tetramethylene phosphonate 7%, phosphonocarboxylic acid copolymer 5%, hydrolyzed polymaleic anhydride 5%, caustic soda 6%, deionized water 65%.

[0023] The antiscalant was applied to a salt field in Henan, and the system could continue to operate for more than 10 months when used at a concentration of 20mg / L, and the antiscalant effect was obvious.

Embodiment 3

[0025] Salt-making antiscaling agent, the mass percentages of effective components of each substance are: 7% of 1,6-hexamethylenetriaminepentamethylenephosphonic acid, 4% of diethylenetriaminepentamethylenephosphonic acid, butyl 2-phosphonate Alkane-1,2,4-tricarboxylic acid 4%, carboxylate-sulfonate-nonionic terpolymer 5%, phosphonocarboxylic acid copolymer 4%, hydrolyzed polymaleic anhydride 3%, polyacrylic acid 4%, deionized water 69%.

[0026] Among them, carboxylate-sulfonate-nonionic terpolymer is composed of monomer acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and hydroxypropyl acrylate in a mass ratio of 12.5:6:1 at 95 It is prepared by polymerization at ℃, and the viscosity-average molecular weight is 3800.

[0027] The antiscalant was applied to a salt field in Ningxia, and the system could continue to operate for more than 10 months when used at a concentration of 20mg / L, and the antiscalant effect was obvious.

technical field

[0001] The invention relates to the field of scale inhibitors and dispersants, in particular to a salt-making scale inhibitor and its application. technical background

[0002] Most brine salt production processes use brine purification to remove calcium and magnesium ions in the original brine, but it is impossible to completely remove them. A certain amount of calcium and magnesium ions still remain in the purified brine. In the subsequent evaporation process, as the brine The continuous evaporation and concentration of brine will increase the concentration of calcium and magnesium ions in the brine, and scale deposits will easily form in the evaporation tank and heating chamber, which will directly lead to a decrease in heat transfer rate, an increase in process energy consumption, and a shortened production cycle. In addition, due to the high salt content of brine, a large amount of deposits and scales will be formed on the surface of the pipeline during ...

Examples

Embodiment 1

[0018] Salt-making antiscaling agent, the mass percentages of effective components of each substance are: 5% of 1,6-hexamethylenetriaminepentamethylenephosphonic acid, 8% of diethylenetriaminepentamethylenephosphonic acid heptasodium salt, carboxylic acid Salt-sulfonate-nonionic terpolymer 2%, phosphonocarboxylic acid copolymer 2%, sodium polyacrylate 12%, caustic soda 2.8%, deionized water 68.2%.

[0019] Among them, the carboxylate-sulfonate-nonionic terpolymer is composed of monomer acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and hydroxypropyl acrylate in a mass ratio of 12.5:6:1 at 90 It is prepared by polymerization at ℃, and the viscosity-average molecular weight is 4300.

[0020] The antiscalant was applied to a salt field in Huainan, and the system could continue to operate for more than 10 months when used at a concentration of 20mg / L, and the antiscalant effect was obvious.

Embodiment 2

[0022] Salt-making antiscaling agent, the mass percentages of effective components of each substance are: 7% of 1,6-hexamethylenetriaminepentamethylenephosphonic acid, 5% of heptasodium diethylenetriaminepentamethylenephosphonic acid, 5% of ethylene diaminepentamethylenephosphonic acid Sodium amine tetramethylene phosphonate 7%, phosphonocarboxylic acid copolymer 5%, hydrolyzed polymaleic anhydride 5%, caustic soda 6%, deionized water 65%.

[0023] The antiscalant was applied to a salt field in Henan, and the system could continue to operate for more than 10 months when used at a concentration of 20mg / L, and the antiscalant effect was obvious.

Embodiment 3

[0025] Salt-making antiscaling agent, the mass percentages of effective components of each substance are: 7% of 1,6-hexamethylenetriaminepentamethylenephosphonic acid, 4% of diethylenetriaminepentamethylenephosphonic acid, butyl 2-phosphonate Alkane-1,2,4-tricarboxylic acid 4%, carboxylate-sulfonate-nonionic terpolymer 5%, phosphonocarboxylic acid copolymer 4%, hydrolyzed polymaleic anhydride 3%, polyacrylic acid 4%, deionized water 69%.

[0026] Among them, carboxylate-sulfonate-nonionic terpolymer is composed of monomer acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and hydroxypropyl acrylate in a mass ratio of 12.5:6:1 at 95 It is prepared by polymerization at ℃, and the viscosity-average molecular weight is 3800.

[0027] The antiscalant was applied to a salt field in Ningxia, and the system could continue to operate for more than 10 months when used at a concentration of 20mg / L, and the antiscalant effect was obvious.

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