Compound scale inhibitor for treating recirculated cooling water and preparation method thereof

Abstract

The invention discloses a compound scale inhibitor for treating recirculated cooling water and a preparation method thereof. The scale inhibitor consists of polyaspartic acid and three or more HEDP, ATMP, SHMP, PESA, and PAPE, wherein the PASP is between 10 and 25 mg / L, the HEDP is between 1 and 10 mg / L, the ATMP is between 1 and 5 mg / L, the PESA is between 1 and 10 mg / L, the SHMP is between 1 and 5 mg / L, and the PAPE is between 1 and 5 mg / L. During the preparation of the compound scale inhibitor, the polyaspartic acid is added first, and then other materials are added into the polyaspartic acid; the heating temperature is between 60 and 80 DEG C, the stirring speed is 300 r / m, and the pH value is between 8.1 and 10.2; and the obtained product is kept stand for 1 to 6 hours. The compound scale inhibitor has excellent scale-inhibiting property and belongs to a low phosphorous formula, the formation rate of calcium phosphate scale is extremely low during the use, wastewater discharged by the formula cannot cause eutrophication pollution to the environment, and the compound scale inhibitor belongs to an environment-friendly product and is particularly suitable for the treatment of recirculated water with high calcium hardness and high alkali hardness.

Description

technical field

[0001] The invention relates to a green water treatment agent, in particular to a compound scale inhibitor for treating circulating cooling water and a preparation method thereof, belonging to the technical field of industrial water treatment. Background technique

[0002] From the requirements of environmental protection and sustainable development, "greening" is undoubtedly an important trend in the development of water treatment agents in the 21st century. In industry, industrial circulating cooling water is a large water user. Whether it is chemical industry, metallurgy, thermal power generation or large-scale central air conditioning, circulating water is used for heat exchange. Therefore, improving the use efficiency of industrial or civil circulating water will save water resources and reduce Production costs and enhanced environmental protection are of great significance.

[0003] Common water treatment agents in industry include: (1) Polyphosphates....

Examples

Embodiment 1

[0014] Preparation of the compound antiscalant: After heating 1L of water to 70°C, add 10mg of PASP into it and dissolve to make the base solution. Then add 3mg HEDP, 3mgATMP, and 3mg polyol phosphate into it and stir evenly, the stirring speed is kept at 300 rpm; the pH value is controlled around 9; stand for 2 hours.

[0015] Prepare Ca2+=800mg / l, HCO 3 - = 1200 mg / l water quality.

[0016] Using the scale inhibitor and water quality of this example to carry out the static scale inhibition test, when the concentration factor is 3 times, the scale inhibition rate of calcium carbonate scale is 89%.

Embodiment 2

[0018] Preparation of the compound antiscalant: After heating 1L of water to 70°C, add 15mg of PASP into it and dissolve to make the base solution. Then add 4mg HEDP, 2mgATMP, and 3mg polyol phosphate, and stir evenly, the stirring speed is kept at 300 rpm; the pH value is controlled around 9; stand for 4 hours.

[0019] Prepare Ca2+=800mg / l, HCO 3 - = 1200 mg / l water quality.

[0020] Using the scale inhibitor and water quality of this example to carry out the static scale inhibition test, when the concentration ratio is 4 times, the scale inhibition rate of calcium carbonate scale is 92%.

Embodiment 3

[0022] Preparation of the compound antiscalant: After heating 1L of water to 70°C, add 15mg of PASP into it and dissolve to make the base solution. Then add 5 mg HEDP, 3 mg ATMP, and 3 mg polyol phosphate, and stir evenly, the stirring speed is kept at 300 rpm; the pH value is controlled around 9; stand for 3 hours.

[0023] Prepare Ca2+=1000mg / l, HCO 3 - = 1400 mg / l water quality.

[0024] Using the scale inhibitor and water quality of this example to carry out the static scale inhibition test, when the concentration factor is 3 times, the scale inhibition rate of calcium carbonate scale is 96%.

technical field

[0001] The invention relates to a green water treatment agent, in particular to a compound scale inhibitor for treating circulating cooling water and a preparation method thereof, belonging to the technical field of industrial water treatment. Background technique

[0002] From the requirements of environmental protection and sustainable development, "greening" is undoubtedly an important trend in the development of water treatment agents in the 21st century. In industry, industrial circulating cooling water is a large water user. Whether it is chemical industry, metallurgy, thermal power generation or large-scale central air conditioning, circulating water is used for heat exchange. Therefore, improving the use efficiency of industrial or civil circulating water will save water resources and reduce Production costs and enhanced environmental protection are of great significance.

[0003] Common water treatment agents in industry include: (1) Polyphosphates....

Examples

Embodiment 1

[0014] Preparation of the compound antiscalant: After heating 1L of water to 70°C, add 10mg of PASP into it and dissolve to make the base solution. Then add 3mg HEDP, 3mgATMP, and 3mg polyol phosphate into it and stir evenly, the stirring speed is kept at 300 rpm; the pH value is controlled around 9; stand for 2 hours.

[0015] Prepare Ca2+=800mg / l, HCO 3 - = 1200 mg / l water quality.

[0016] Using the scale inhibitor and water quality of this example to carry out the static scale inhibition test, when the concentration factor is 3 times, the scale inhibition rate of calcium carbonate scale is 89%.

Embodiment 2

[0018] Preparation of the compound antiscalant: After heating 1L of water to 70°C, add 15mg of PASP into it and dissolve to make the base solution. Then add 4mg HEDP, 2mgATMP, and 3mg polyol phosphate, and stir evenly, the stirring speed is kept at 300 rpm; the pH value is controlled around 9; stand for 4 hours.

[0019] Prepare Ca2+=800mg / l, HCO 3 - = 1200 mg / l water quality.

[0020] Using the scale inhibitor and water quality of this example to carry out the static scale inhibition test, when the concentration ratio is 4 times, the scale inhibition rate of calcium carbonate scale is 92%.

Embodiment 3

[0022] Preparation of the compound antiscalant: After heating 1L of water to 70°C, add 15mg of PASP into it and dissolve to make the base solution. Then add 5 mg HEDP, 3 mg ATMP, and 3 mg polyol phosphate, and stir evenly, the stirring speed is kept at 300 rpm; the pH value is controlled around 9; stand for 3 hours.

[0023] Prepare Ca2+=1000mg / l, HCO 3 - = 1400 mg / l water quality.

[0024] Using the scale inhibitor and water quality of this example to carry out the static scale inhibition test, when the concentration factor is 3 times, the scale inhibition rate of calcium carbonate scale is 96%.