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Pretreatment filming agent and pretreatment filming method for circulating cooling water system

A technology of circulating cooling water and pre-filming agent, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. Simplified operation and cost saving effect

Inactive Publication Date: 2004-07-07
中国石油化工股份有限公司北京燕山分公司研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before 1998, the method of S204 solid pre-film agent plus copolymer was mostly used, that is, sodium hexametaphosphate plus zinc salt plus copolymer plus sulfamic acid. The problem encountered during pre-film was that the agent was added to the system. There are a lot of insoluble matter, the turbidity of water is high (greater than 20mg / L), and the pre-film effect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation process: prepare 50g each of liquid A and liquid B

[0031]0.92g zinc oxide is mixed with 10g phosphoric acid, stirred and dissolved, and 8g water is added, then adding 31.08g solid content is 30% AA / AMPS / HPA containing sulfonic acid group terpolymer (HPA is hydroxypropyl acrylate, weight Ratio is AA / AMPS / HPA=60 / 20 / 20), stir, shake up, promptly obtain the 50gB liquid of required preparation; Dissolve 0.8g benzotriazole in 4.5g active ingredient and be 50% HPAA and Add 14.5g of HEDP with 50% active ingredient, then add 30.2g of water, and shake well to obtain 50g of liquid A that needs to be prepared.

[0032] Add the above-prepared drug A solution to the test water at a concentration of 250mg / L, and then add 250mg / L of B solution to carry out the test of "rotating coupon weight loss method". The water quality of the test water is: Ca 2+ 155mg / L, total alkalinity 160mg / L, Cl - 41mg / L, SO 4 2- 18mg / L, pH7.6, turbidity 1.2mg / L. The test temperature is 30°C...

Embodiment 2

[0041] Preparation process: prepare 50g each of liquid A and liquid B

[0042] 1.72g of zinc oxide is mixed with 7g of phosphoric acid, stirred and dissolved, and 30g of AA / AMPS containing sulfonic acid group binary copolymer (weight ratio is AA / AMPS=60 / 40) with a solid content of 30% is added, and 11.28g of water is added, fully Dissolve and shake well to obtain the required B solution. Add 24g of HEDP with an active component of 50% to 10g of paraphosphosulfonic acid with an active component of 40%, then add 1.3g of benzotriazole, stir and dissolve, then add 14.7g of water, fully dissolve, shake Mix evenly to get the required A solution.

[0043] Dosing the above prepared medicament solution A into the test water at a medicament concentration of 150mg / L, then adding 150mg / L of B solution into the test water, and carrying out the test of "rotating coupon weight loss method", the water quality of the test water is : Ca 2+ 231mg / L, total alkalinity 243mg / L, Cl - 79mg / L, SO ...

Embodiment 3

[0052] Preparation process: Prepare 50g each of liquid A and liquid B.

[0053] 1.2g of zinc oxide is mixed with 9g of phosphoric acid, stirred and dissolved, and 20g of AA / AMPS containing sulfonic acid group binary copolymer (weight ratio is AA / AMPS=70 / 30) with a solid content of 30% is added, and 19.8g of water is added, namely To obtain 50g of B liquid to be prepared; mix 1g of benzotriazole, 8g of EDTMP with 30% active ingredient and 26g of HEDP, stir to dissolve, then add 15g of water, fully dissolve, shake well, and obtain 50g of the required preparation Liquid A.

[0054] Add the above-mentioned prepared drug solution A liquid to the test water at a drug concentration of 200 mg / L, then add 200 mg / L of B liquid to the test water, and carry out the test of "rotating coupon weight loss method". The water quality of the test water is : Ca 2+ 155mg / L, total alkalinity 123mg / L, Cl - 106mg / L, SO 4 2- 34mg / L, pH8.4, turbidity 1.6mg / L. The test temperature is 25°C, and the...

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Abstract

A precoating agent for precoating a film on the inner surface of the equipment and pipeline in a circulating cooling water system is prepared from phosphoric acid (2-10 wt.%), zinc dihydrogen phosphate (1-10), organic phosphonic acid (5-18), hydrocinnamyl triazazole (0.5-2.0), and the copolymer containing carboxy. Its advantages are low cost and simplified operation.

Description

technical field [0001] The invention relates to a pre-film agent suitable for circulating cooling water systems and a pre-film method for circulating cooling water systems, in particular to a pre-film agent for starting up a circulating cooling water system without acid addition and a pre-filming method for circulating cooling water systems Pre-film method. Background technique [0002] The all-organic alkaline water treatment technology is currently the commonly used method for circulating water treatment. This technology has the advantages of no need to add acid and low corrosion rate. Because there is no acid-adding equipment on site, the pre-film is required to be carried out without adding acid. Before 1998, the method of S204 solid pre-film agent plus copolymer was mostly used, that is, sodium hexametaphosphate plus zinc salt plus copolymer plus sulfamic acid. The problem encountered during pre-film was that the agent was added to the system. There are a lot of insol...

Claims

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Application Information

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IPC IPC(8): C02F5/12C02F5/14
CPCC23F11/08
Inventor 阎岩王成郦和生常磊李祥舟秦会敏
Owner 中国石油化工股份有限公司北京燕山分公司研究院
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