Composite scale resistant corrosion inhibitor and its use in reusing ammonia-nitrogen containing waste water in circulating cooling water

A scale and corrosion inhibitor, circulating cooling water technology, applied in the direction of scale removal and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc.

Inactive Publication Date: 2004-04-28
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

[0003] Chinese patent application CN1258649A discloses a multi-component compound scale and corrosion inhibitor, which mainly includes organic phosphonic acid, sulfonic acid-containing copolymer and zinc salt, and can be used for petrochemical The disadvantage of wastewater treatment is that the multi-component compound scale and corrosion inhibitor can only be used for petrochemical wastewater with very little ammonia nitrogen content (0.14-1.88mg / L) as circulating water treatment for replenishment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation process: prepare compound scale and corrosion inhibitors A liquid and B liquid 80g each

[0037] Weigh 10.4g of sodium phosphate and dissolve it in 67.6g of water, stir to dissolve, then add 2g of sodium hexametaphosphate, shake well and dissolve to obtain 80g of liquid A that needs to be prepared.

[0038] Taking by weighing 40g solid content is that 30% AA / AMPS / HPA contains carboxylic acid group and sulfonic acid group terpolymer (weight ratio is AA / AMPS / HPA=70 / 15 / 15), active component is 50% Dissolve 6g of PBTCA in 16.5g of water, and finally add 17.5g of zinc sulfate heptahydrate and 10 drops of 1:3 sulfuric acid to fully dissolve it, and shake it well to obtain 80g of liquid B to be prepared.

[0039] When adding liquid A and liquid B prepared in the test water at a concentration of 80 mg / L at the same time, sodium phosphate (in PO 4 3- meter), sodium hexametaphosphate, terpolymer containing carboxylic acid groups and sulfonic acid groups, PBTCA, Zn ...

Embodiment 2

[0042] Preparation process: prepare compound scale and corrosion inhibitors A liquid and B liquid 80g each

[0043] Weigh 3g of disodium hydrogen phosphate and dissolve it in 71g of water, stir to dissolve, then add 6g of sodium hexametaphosphate, shake well and dissolve to obtain 80g of liquid A that needs to be prepared.

[0044] Taking by weighing 27g solid content is that 30% AA / MA / HPA contains carboxylic acid group terpolymer (weight ratio is AA / MA / HPA=60 / 8 / 32), active ingredient is 50% PBTCA 8g, dissolves In 27.5g of water, finally add 17.5g of zinc sulfate heptahydrate and 10 drops of 1:3 sulfuric acid to fully dissolve and shake well to obtain 80g of liquid B to be prepared.

[0045] When the prepared A liquid and B liquid are added to the test water at a concentration of 80mg / L at the same time, the disodium hydrogen phosphate (in PO 4 3- total), sodium hexametaphosphate, terpolymer containing carboxylic acid group, PBTCA, Zn 2+ The effective concentrations are 2mg...

Embodiment 3

[0048] Preparation process: prepare compound scale and corrosion inhibitors A liquid and B liquid 80g each

[0049] Weigh 3.8g of sodium dihydrogen phosphate and dissolve it in 72.2g of water, stir to dissolve, then add 4g of sodium hexametaphosphate, shake well and dissolve to obtain 80g of liquid A that needs to be prepared.

[0050] Take by weighing 30g solid content and be that 30% AA / AMPS / HPA contains carboxylic acid group and sulfonic acid group terpolymer (weight ratio is AA / AMPS / HPA=60 / 20 / 20), active ingredient is 50% Dissolve 8g of HEDP in 33.7g of water, and finally add 8.3g of anhydrous zinc chloride and 5 drops of concentrated hydrochloric acid to fully dissolve it, and shake it well to obtain 80g of liquid B to be prepared.

[0051] When the prepared A liquid and B liquid are added to the water containing the test at a concentration of 80 mg / L at the same time, the sodium dihydrogen phosphate (in PO 4 3- meter), sodium hexametaphosphate, terpolymer containing ca...

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Abstract

The present invention features that while reusing sewage containing ammonia nitrogen as circulating cooling water, acid is added into water to control pH value in 6.5-8.5, and composite scale and corrosion inhibitor and bactericide are used unitedly to control the corrosion, scaling and bacteria growth during reusing sewage. The composite scale and corrosion inhibitor includes phosphate, polyphosphate, organic phosphonic acid, carboxy radical containing copolymer, zinc salt, etc.

Description

technical field [0001] The present invention relates to a composite scale and corrosion inhibitor and its application in the recycling of ammonia nitrogen-containing sewage to circulating cooling water. More specifically, the present invention relates to a composite scale and corrosion inhibitor and its application in secondary biochemical treatment The post-ammonia nitrogen-containing sewage is used as makeup water for the circulating cooling water system. Background technique [0002] Usually, the crude oil used in refineries contains nitrogen-containing compounds. During the refining process of crude oil, a material flow containing ammonia nitrogen will be produced. Although most of the useful ammonia is recovered from this material flow through the ammonia refining process, some ammonia will inevitably enter The sewage system is formed to form sewage containing ammonia nitrogen. At present, this part of ammonia nitrogen-containing sewage is generally sent to the sewage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14
Inventor 任志峰郦和生李春丽王岽成敏张士义郭红卫张春原阎岩李祥舟秦会敏常磊
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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