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Corrosion-retarding compound scaling inhibitor for treating circulating low-hardness water

A technology of corrosion and scale inhibitor and composite agent, which is applied in water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, descaling and water softening, etc. Inhibit calcium phosphate scale, poor dispersion, high adhesion rate, etc., to achieve excellent calcium phosphate scale resistance performance, prevent calcium phosphate scale precipitation, and simple operation

Inactive Publication Date: 2003-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the organic phosphonic acid and organic phosphonic acid in the formula have poor calcium phosphate scale inhibition and dispersion effects, which show that they have a good treatment effect on water with very low alkalinity and hardness, and when the hardness and alkalinity of water quality are slightly higher , the adhesion rate of some test tubes will be higher
If a polymer with good calcium phosphate scale resistance is added to the formula, the effect and dispersion effect of calcium phosphate scale resistance will be improved, but it will bring difficulty in compounding, and it will affect the activity of cationic surfactant type fungicides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example is the preparation of 2-phosphino-1,2-dicarboxylic acid-6-sulfonic acid hexane (PSHD).

[0029] Take a 500ml four-neck bottle, add 358g (2.49mol) of dimethyl maleate and 180g of glacial acetic acid, heat up to 60°C under stirring, add 333g of trimethyl phosphite dropwise, control the reaction temperature and keep it warm for 24 hours, then distill it off under reduced pressure The resulting methyl acetate and excess glacial acetic acid yield intermediates.

[0030] In a 500ml four-neck flask, add 41g of intermediate (0.16mol) dropwise to 13.6g of KH (0.176mol) suspended in toluene (250ml), stir at room temperature for 30 minutes, add 52g of dibromobutane (0.24mol ), heated and refluxed for 4 hours. Cool the reaction mixture with 2% HO 2 SO 4 Wash with MgSO 4 Dry and distill under reduced pressure to remove light components to obtain 25 g of halogenated phosphine carboxylate.

[0031] In a 100ml three-necked flask, add 13g (0.031mol) halogenated phosphi...

Embodiment 2

[0034] This embodiment is a carbon steel corrosion experiment.

[0035] Preparation of complex agent: 30 grams of HPAA, 10 grams of PSOD, 4 grams of ATMP, 10 grams of ZnCl 2 , 46 g H 2 O was added to a 250ml beaker in turn, and stirred evenly to obtain the required compounding agent

[0036] Water quality: calcium hardness 18mg / L, magnesium hardness 16mg / L, total alkalinity 50mg / L.

[0037] Referring to the HG / T2159-91 standard, the above-mentioned compounding agent and water quality were used to carry out the corrosion test of rotating coupons. The test water temperature was 80°C, the speed was 75 rpm, and the operation was 96 hours. The amount of compounding agent added was 50mg / L.

[0038] Experimental results: The corrosion rate of the test piece is 0.030mm / a.

Embodiment 3

[0040] This embodiment is a carbon steel corrosion experiment.

[0041] Compound ratio: 15g HPAA, 20g PSOD, 4g HEDP, 4g ZnSO 4 , 57 g H 2 O.

[0042] Water quality: calcium hardness 55mg / L, magnesium hardness 20mg / L, total alkalinity 60mg / L.

[0043] The experimental method is the same as that in Example 2, and the addition amount of the compound agent is 50 mg / L.

[0044] Experimental results: The corrosion rate of the test piece is 0.045mm / a.

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Abstract

A corrosion-retarding compound scaling inhibitor for treating the circulated low-hardness coding water contains sulfonic acid contained phosphincarboxylic acid (1-30 wt.%), hydroxyphosphinoacetic acid compound (5-40%), organic phosphonic acid compound (1-12%), zinc salt (1-20%) and water (30-80%). Its advantages include high anti-scaling effect, no deposit of calcium phosphate, and less nutrient-enriching pollution of water.

Description

technical field [0001] The invention relates to a water treatment agent for treating low-hardness circulating water. technical background [0002] For industrial circulating cooling water systems, different water quality causes different degrees of metal corrosion, and the corrosion and scaling tendency of water quality can be measured by the stability index (IR) of water. 6.0<IR<7.5 belongs to corrosive water quality, and IR>7.5 belongs to strong corrosive water quality. The water quality in most parts of southern my country belongs to low hardness and low alkalinity water quality. The calcium hardness in the water is less than 60mg / L, the alkalinity is less than 80mg / L, the pH is about 7, and the stability index IR>7.5, which belongs to highly corrosive water quality. In some areas, the calcium hardness of the water is less than 20 mg / L, the alkalinity is less than 60 mg / L, the total dissolved solids content is 66-100 mg / L, and the stability index IR is more t...

Claims

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Application Information

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IPC IPC(8): C02F1/54C02F5/14C23F14/00
CPCC23F11/08C23F14/02
Inventor 王振宇李本高
Owner CHINA PETROLEUM & CHEM CORP
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