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Method for preparing phosphor-free anti-scaling corrosion inhibitor

A technology of phosphorus-free scale inhibition and preparation method, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. and other problems, to achieve the effect of saving industrial water, good synergy, and inhibiting corrosion

Active Publication Date: 2012-02-15
SHANDONG TIANQING TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of phosphorus-free scale and corrosion inhibitors to solve the problems of scale, corrosion and microorganisms used in the prior art to deal with industrial circulating cooling water. The content of total phosphorus in the circulating cooling water discharge is high, it does not meet the requirements of the national environmental protection policy, and it cannot meet the needs of safe and stable operation of industrial circulating cooling water, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 50kg of sodium molybdate, 500kg of polyaspartic acid, 300kg of binary copolymer, 40kg of methylbenzotriazole, 30kg of zinc sulfate, and 80kg of deionized water to make 1000kg.

[0020] Mix the above-mentioned raw materials in proportion in the reaction kettle for compounding, and the compounding ambient temperature is 20°C.

[0021] A chemical plant uses a plate heat exchanger, and the volume of the circulating cooling water system is 2000m 3 , the circulation volume is 3000m 3 , The material of the heat exchanger is TP304, and the pipe is carbon steel pipe. Concentration ratio is 5.5 times, and 30 mg / L of the environmentally friendly and economical phosphorus-free scale and corrosion inhibitor of the present invention is added according to the amount of water replenishment. "Determination of molybdate in industrial circulating cooling water by thiocyanate spectrophotometry" GB / T 23836-2009 The actual detection of molybdate content is 5.3mg / L.

[0022] Note: 66...

Embodiment example 2

[0025] Weigh 10kg of sodium molybdate, 300kg of polyaspartic acid, 200kg of terpolymer, 10kg of methylbenzotriazole, 10kg of zinc chloride, and 470kg of deionized water to make 1000kg.

[0026] The above-mentioned raw materials are mixed in proportion in the reaction kettle for compounding, and the compounding ambient temperature is 25°C.

[0027] A thermal power plant is a shell and tube condenser, and the volume of the circulating cooling water system is 5000m 3 , the circulation volume is 10800m 3 , The material of the heat exchanger is H68 brass, and the pipe is carbon steel pipe. The concentration ratio is 6 times, and the non-phosphorous scale and corrosion inhibitor of the present invention is added according to the amount of water replenishment 20mg / L, and the theoretically calculated molybdate content is 1%×66.1%×20×6=0.79mg / L. Determination of molybdate in cooling water Thiocyanate spectrophotometric method "GB / T 23836-2009 The actual detection of molybdate content...

Embodiment example 3

[0030] Weigh 20kg of sodium molybdate, 450kg of polyaspartic acid, 250kg of terpolymer, 30kg of methylbenzotriazole, 20kg of zinc chloride, and 230kg of deionized water to make 1000kg.

[0031] The above-mentioned raw materials are mixed in proportion in the reaction kettle for compounding, and the compounding ambient temperature is 30°C.

[0032] A power plant uses shell and tube heat exchangers, and the volume of the circulating cooling water system is 13000m 3 , the circulation volume is 22000m 3 , The condenser material is TP316 stainless steel, and the pipe is carbon steel pipe. The concentration ratio is 5.5 times, and the phosphorus-free scale and corrosion inhibitor 28mg / L of the present invention is added according to the amount of water replenishment. The theoretically calculated molybdate content is 2%×66.1%×28×5.5=2.04mg / L. Determination of molybdate in cooling water Thiocyanate spectrophotometric method "GB / T 23836-2009 The actual detection of molybdate content ...

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Abstract

The invention provides a method for preparing a phosphor-free anti-scaling corrosion inhibitor. The method is characterized in that: the phosphor-free anti-scaling corrosion inhibitor is a composition consisting of the following raw materials in parts by weight: 5 to 50 parts of deionized water, 1 to 5 parts of sodium molybdate, 30 to 50 parts of polyaspartic acid, 20 to 30 parts of polycarboxylic acid, 1 to 4 parts of methylbenzotriazole, and 1 to 3 parts of zinc salt. The method comprises the following step of mixing the raw materials in a reaction kettle according to a preset proportion toprepare the required phosphor-free anti-scaling corrosion inhibitor, wherein the mixing environmental temperature is between 20 DEG C and 30 DEG C. According to the method, monomers have excellent synergic action and long stable phase, emission of 'the three wastes' is prevented, the environmental pollution problem caused by phosphor is completely eliminated, the concentration rate of industrial recycling cooling water reaches over 5 times, and massive water resources are saved. Test results prove that scale inhibition rate is over 95 percent, the environmentally friendly requirement for the industrial recycling cooling water treatment discharge is fulfilled.

Description

Technical field [0001] The invention is the field of industrial circulating water treatment technology and involves a stains. Background technique [0002] Industrial circulating cooling water treatment is mainly to solve the problems of scaling, corrosion and microbial hazards in the industrial circulating cooling water system.Incorporating dirt -resistant corrosion agent to the circulating cooling water system is the most important way. At present, the total phosphorus content of the total phosphorus content produced and applications produced and applied by most dirt -resistant corrosion agents is relatively high.Generally, the total phosphorus content is above 6.8%, resulting in the total phosphorus in industrial circulating cooling water is generally 7-15 mg / L. Although the total phosphorus content with high total phosphorus content is a non -toxic or low -toxic water treatment agent, they are, but they areIt will cause environmental problems such as rich nutritionalization a...

Claims

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Application Information

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IPC IPC(8): C02F5/10C02F5/12C23F11/14C23F11/18
Inventor 胡新霞刘文峰王金明刘晓民柴斌张雷毕光照
Owner SHANDONG TIANQING TECH DEV
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