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Effect of circulating water treatment agent of scale inhibition and dispersion effect of the main factors

In recent years, various types of water treatment agents and formulations are constantly emerging, in order to maximize the effect of water treatment agent, the understanding and study of the water treatment agent of the applicable conditions and the mechanism of action is particularly important. Many engaged in water treatment technology research and application of the technical staff of poly phosphate, organic phosphate and carboxylic acid polymer dispersing agent made relatively thorough research on the scale inhibition and dispersion agent, and the proper use of new scale inhibition and dispersion agent played a role in promoting development. However, on the scale inhibitor and compound corrosion inhibitor in use for inhibiting calcium carbonate and calcium phosphate scale inhibition and dispersion performance influence factor is lack of systematic study, showed the same reagents in different circulating water system or in the same cycle water system in different period of treatment differ very far. For the interpretation of water treatment agent in actual use in the emergence of some abnormal phenomena of water treatment agent, correctly grasp the conditions of use, it is necessary to present the routine use of several kinds of typical water treatment agent affecting factors are systematically studied.

This article through nuclear magnetic resonance ( NMR ) instrument at home and abroad China used 9 kinds of typical water treatment agent of the main component analysis, main component is determined by agents; by static scale inhibition test method to study the concentration of the medicament, turbidity, ferric ion, calcium hardness and alkalinity as well as fungicides and other factors on the performance of scale inhibition and dispersion agent the effect, the 5 main influence factors on different types of pharmaceutical performance of scale inhibition and dispersion effect is not the same.

1 test methods

1.1 water and chemicals

Water quality: 100mg/L 135mg/L calcium hardness, alkalinity.

Agent: water treatment agent of all retrieved circulating water field.

1.2 test methods

Method: test water treatment agent principal component analysis by Swiss Buuk company 300M nuclear magnetic resonance spectrometer ( NMR ).

Methods: inhibition of calcium carbonate inhibition by Sinopec " cooling water analysis and test method of the 401 law ".

Resistance calcium phosphate scale according to Sinopec " cooling water analysis and test method of the 402 law ".

2 scale dispersant classification

From the scene of 35 domestic and international water treatment agent sample, the first analysis of physical and chemical indexes, classifying, and nuclear magnetic resonance and ion chromatography of main component and structure identification, summed up 9 types of specific as shown in table 1. The first class to third class for the copolymer type scale inhibitor dispersing agent, fourth to ninth categories are compound corrosion inhibitor; further comparison can be seen, the fourth class to sixth class is the main component of unit polymer, seventh class to ninth class contains multiple copolymer.

3 scale inhibition and dispersion effects

3.1 drug concentration effect

The concentration of the medicament is one of the main factors influencing effect. Table 2 is the agent in the respective insecticides recommended concentration range of scale inhibition and dispersion effects. The results showed that: 9 different types of agents in 3 concentration under the conditions of the calcium carbonate has the scale inhibition effect. Under the same concentration, the inhibition rate of composite agent more than single agent inhibition rate, is the main agent of the other component and a polymeric synergies exist between. In general, HEDP and polymer have obvious synergistic effect. The polymer single agent, containing hydroxy sulfonic acid group is better than other types of scale effect, mainly because the polymer in the sulfonic acid group is strong polar group, have stronger dispersion effect. But the resistance of calcium phosphate and inhibiting calcium carbonate is significantly different, 1, 4 and 7 three types of almost no resistance calcium phosphate role, the other six categories in low concentration of scale effect is very poor, with the concentration increased, scale effect is significantly increased, such as second, 3, 8 and 9 four class. This phenomenon indicates that the resistance mechanism and resistance of calcium phosphate and calcium carbonate in the mechanism of action is not the same. Wang Jing ( 4 ) argues that: inhibitors on calcium carbonate inhibition depends mainly on the solubilization and teratogenicity, the calcium carbonate is not easy to form crystals and crystal size. But the resistance of calcium phosphate, calcium phosphate solubility active due to small, easy to form crystals, scale inhibitor on the calcium phosphate solubilization not worth mentioning, only those who can disperse has formed crystal dispersing agent, can prevent formation of calcium phosphate scale effect, therefore, on the calcium phosphate works mainly by agents dispersing ability. In general, containing hydroxyl groups, sulfonic acid polymer has good dispersing effect, which showed better resistance of calcium phosphate.

Table 1 the main components of classified samples

Chemical types of main components

1 acrylic / polycyclic aromatic sulfonates

2 acrylate / allyl sulfonate hydroxypropyl ether

3 acrylic acid / methyl acrylate

4 polypropylene acid /HEDP/Zn2+

5 polypropylene acid /PBTC/Zn2+

6 polyacrylic acid / polyoxyethylene ether ester /Zn2+

7 of acrylic acid and maleic anhydride copolymer /PBTC/Zn2+

8 AMPS /HEDP/PBTC/Zn2+ copolymer of acrylic acid and

9 acrylic acid and sulfonate hydroxypropyl ether copolymer /HEDP/PO43-/Zn2+

Table 2 different types of agents in different concentrations of smegma rate%

Medicament

Types of different concentration of inhibition rate

30 10 30 10 30 10.

Calcium carbonate calcium phosphate calcium carbonate calcium phosphate calcium carbonate calcium phosphate

116.2 0 16.8 1.2 32.6 6

251.3 6.5 55.1 90.7 69.4 93.8

319.8 7.7 39 100 41.2 97.9

476.4 2.1 78.2 4.4 79.9 7.2

582.3 4.9 85.7 9.1 87.6 29.6

683.1 39.3 85.9 38.6 86 39.3

783.6 3.4 83.7 3.3 87.1 4.5

887.6 27.4 93.3 93.2 94 95.8

977.8 49.7 83 63.8 83.5 91.1

Note: brackets in the depth first, 2, and 3 types of agents depth

3.2 the effect of turbidity

Table 3 turbidity on 9 reagent calcium carbonate and calcium phosphate scale inhibitive effect results. The data in Table 3 show, turbidity, 4, and 7 to third of three kinds of chemicals inhibiting calcium carbonate scale effect basically has no effect on the fifth, 6, 9, 8 and four compounds inhibiting calcium carbonate scale effect has negative effect, and with increased turbidity, these agents inhibiting calcium carbonate scale effect is reduced, but on the first and 2 two types of agents inhibiting calcium carbonate scale effect are synergistic effect, with high turbidity or calcium carbonate inhibition effect increased. A comparison of these differences can be seen, the single agent of calcium carbonate inhibition effect by the turbidity of small effect, the majority of compound calcium carbonate inhibition effect was affected by the influence of turbidity on the turbidity; calcium phosphate scale inhibitive effect greater than calcium carbonate inhibition effect, such as second, 3, 8 and 9 four kinds of medicament, resistance phosphate calcium carbonate scale effect with turbidity increases drastically, shall be used in a control loop of the turbidity of water within 10mg/L. This phenomenon also shows medicament inhibiting calcium carbonate is mainly the solubilization and teratogenic effects, resistance calcium phosphate scale is mainly dispersion effect.

Table 3 Effect of different medicament turbidity of scale inhibition and dispersion effects

Medicament

Different types of inhibition rate of turbidity

0 mg/L 10mg/L 30mg/L 50mg/L

Calcium carbonate calcium phosphate calcium carbonate calcium phosphate calcium carbonate calcium phosphate calcium carbonate calcium phosphate

116.8 1.2 17.8 0 22.9 0 39.1 0

255.1 90.7 58.1 86.8 57.7 64.4 66.3 52.7

339 100 33.3 90.4 33.5 76.1 33.6 66.5

478.2 4.4 76.2 4.7 76 9 75.9 6.7

585.7 9.1 82.4 9 72.4 8 69.9 9.1

685.9 38.6 80.3 38 76.9 31 74.8 29.3

783.7 3.3 83.1 0 82.3 0 81.5 0

893.3 93.2 85.9 90 81.7 87.1 77.6 78.3

983 63.8 79.4 63 72 57.3 68.6 57

3.3 effect of ferric ion

Circulating water are often due to metal corrosion to iron ion concentration increased, especially the use of strong corrosive water circulating water system and material leakage system, iron ion concentration is sometimes as high as 5mg/L. Iron ions in different types of chemical scale inhibition and dispersion effects as shown in table 4. The data in Table 4 show : iron ion in addition to the fourth and 9 two kinds of medicament inhibiting calcium carbonate scale effect is very small, the other seven kinds of chemicals inhibiting calcium carbonate scale effect is great, and with the increase of iron ion concentration, calcium carbonate inhibition effect is greatly reduced; iron ion on all of the nine types of reagents resistance calcium phosphate scale have great influence, with iron ion concentration increased, the calcium phosphate scale inhibitive effect is greatly reduced. These results indicate that circulating water of iron ions on scale inhibition and dispersion effect is a kind of very harmful ions, in use should be possible control of iron ion concentration is less than 1mg/L.

Table 4 iron ions on chemical scale inhibition and dispersion effect.

Medicament

Different types of iron ion content of inhibition rate

0 mg/L 1mg/L 3mg/L 5mg/L

Calcium carbonate calcium phosphate calcium carbonate calcium phosphate calcium carbonate calcium phosphate calcium carbonate calcium phosphate

116.8 1.2 16.3 0 2.4 0 3 0

255.1 90.7 31.5 0 21 0 8.3 0

339 100 34.8 93.2 25.6 92.6 24.1 4

478.2 4.4 78 4.7 78.7 5.9 75.6 6.1

585.7 9.1 76.4 5.9 69.3 4 67.8 5

685.9 38.6 76.3 38 44.6 32.5 37.7 23.1

783.7 3.3 71.6 3.6 67 4.1 65.3 0

893.3 93.2 91.8 87.7 89.5 87.4 87.6 66.8

983 63.8 77 63 68.7 59.9 51.7 49.8

3.4 calcium hardness and alkalinity influence

The people in the water treatment practice, water calcium hardness and alkalinity on dispersing agent and the effect of the great. Table 5 is the calcium hardness and alkalinity on different types of scale inhibition and dispersion effects influence the results. Results in Table 5 clearly shows that calcium hardness and alkalinity in water, various types of agents on calcium carbonate inhibition effect is very large. Calcium hardness and alkalinity with increased, inhibition rate decreased, but the impact is not the same. The first four agent on calcium carbonate inhibition effect influence, shows that these four kinds of agents not in high calcium hardness and alkalinity in water using. On four kinds of medicament after calcium carbonate inhibition effect on smaller, shows that these four kinds of medicament can be high in hardness and alkalinity in water using.

Table 5 calcium hardness and alkalinity on different types of chemical scale inhibitor dispersing effect.

Medicament

Different types of calcium hardness and alkalinity in water scale inhibition rate

A B C D water water water water

Calcium carbonate calcium phosphate calcium carbonate calcium phosphate calcium carbonate calcium phosphate calcium carbonate calcium phosphate

1100 0 18.4 0 14.2 0 16.8

2100 49.6 95.2 7.9 67.7 0 55.1

398 89.2 66 40.9 36.3 0 39

493.7 83.3 91.7 16.5 89.2 3.3 78.2

598.8 96.5 97.3 32.2 93.8 0 85.7

698 79.5 95.2 51.5 91.4 33.4 85.9

798.7 0 87.5 0 80.9 0 83.7

897.7 100 97.2 90.5 90.1 84.4 93.3

997.5 100 97.9 84.2 90.4 70.9 83

Note: A water hardness and alkalinity were 100mg/L and 135mg/L; B water hardness and alkalinity were 150mg/L and 203mg/L; C water hardness and alkalinity were 200mg/L and 270mg/L; D water hardness and alkalinity were 250mg/L and 250mg/L.

Compared with resistance of calcium carbonate, calcium hardness and alkalinity water on insecticide resistance calcium phosphate scale effect more. If in addition to the eighth and 9 two kinds of medicament resistance calcium phosphate scale effect is relatively small, the other seven kinds of medicament, when calcium hardness and alkalinity increased 1 times, these agents on calcium phosphate scale almost completely out of scale inhibition.

Effects of 3.5 fungicides

Fungicides against corrosion and scale inhibitor for inhibiting calcium carbonate and the effect of calcium phosphate as shown in table 6.

Table 6 fungicides on chemical scale inhibition and dispersion effect.

Medicament

Different types of fungicides, inhibition rate

Without fungicides fungicide 1 fungicides fungicide fungicide 4 3 2

Calcium carbonate calcium phosphate calcium carbonate calcium phosphate calcium carbonate calcium phosphate calcium carbonate calcium phosphate calcium carbonate calcium phosphate

116.8 1.2 15.9 2.8 16.9 1.9 9.9 2.7 13.5 2.5

255.1 90.7 54.5 69.8 34.4 0.7 46.8 83.9 55.6 89.6

339 100 34.9 93.6 44.1 0.9 36.6 98 37.1 96

478.2 4.4 75.4 39.5 71.6 3.2 64.7 53.3 80.8 42.9

585.7 9.1 77 25.9 83.8 4.6 80.3 42.9 81.3 24.7

685.9 38.6 90.5 39.5 89.3 3.2 89.9 52.9 82.3 56.5

783.7 3.3 83.9 5.6 86.3 2.5 65.9 4.3 82 4.6

893.3 93.2 90.1 100 88.8 2

 
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