Composite corrosion and scale inhibitor, and its application in circulating cooling water treatment
A technology of corrosion and scale inhibitors and additives, applied in water/sludge/sewage treatment, descaling and water softening, chemical instruments and methods, etc., can solve the problems of high total phosphorus concentration, no report on oxalic acid research, phosphorus discharge restrictions And other issues
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Embodiment 1
[0058] Take by weighing 18.0g oxalic acid, 6.6g zinc sulfate heptahydrate, 15.0g active matter content and be 30% by weight maleic anhydride and styrene sulfonic acid copolymer (at 30 ℃, limit viscosity is 0.072dl / g, maleic anhydride and The weight ratio of styrene sulfonic acid = 70 / 30), 16.0 g of glutamic acid with an active content of 50% by weight, dissolved in 42.7 g of water to prepare a corrosion and scale inhibitor.
[0059] Add the prepared medicament to the test water 1, so that the concentration of the corrosion and scale inhibitor is 35 mg / L test water.
Embodiment 2
[0061] Weigh 20.0g of sodium oxalate, 3.15g of anhydrous zinc chloride, 20.0g of acrylic acid and styrene sulfonic acid copolymer with an active substance content of 30% by weight (the limiting viscosity at 30°C is 0.072dl / g, acrylic acid and styrene The weight ratio of sulfonic acid=70 / 30), 33.3g of polyacrylic acid with an active substance content of 30% by weight (at 30°C, the limiting viscosity is 0.072dl / g, and the weight average molecular weight is 3000) are dissolved in 23.55g of water to form a slow Corrosion and scale inhibitors.
[0062] Add the prepared agent to the test water 2 (adjust the pH value to 7.8-8.2 with sulfuric acid), so that the concentration of the corrosion and scale inhibitor is 40mg / L test water.
Embodiment 3
[0064] Weigh 25.0g of potassium oxalate, 6.6g of zinc sulfate heptahydrate, and 23.3g of ethyl acrylate and styrenesulfonic acid copolymer with an active content of 30% by weight (at 30°C, the limiting viscosity is 0.072dl / g, ethyl acrylate The weight ratio to styrene sulfonic acid = 70 / 30), 18.0g of active matter content of 50% by weight hydroxyethylidene diphosphonic acid was dissolved in 27.1g of water to prepare corrosion and scale inhibitors.
[0065] Add the prepared agent to test water 1 and 2 (adjust the pH value to 7.8-8.2 with sulfuric acid), so that the concentration of corrosion and scale inhibitor is 45mg / L test water.
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