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Method for inhibiting the formation and deposition of silica scale in aqueous systems

A water system, silicon oxide technology, applied in chemical instruments and methods, special compound water treatment, water softening, etc., can solve problems such as undetectable

Inactive Publication Date: 2011-05-04
NALCO CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, silica levels can be increased from 150-200 to 180-220ppm by adding a dispersant, an increase that is usually not detectable in a silica cycle

Method used

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  • Method for inhibiting the formation and deposition of silica scale in aqueous systems
  • Method for inhibiting the formation and deposition of silica scale in aqueous systems
  • Method for inhibiting the formation and deposition of silica scale in aqueous systems

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] beaker experiment

[0044] Use will yield an initial concentration of 300PPM (as SiO 2 ) of sodium metasilicate to prepare a solution for the beaker experiment. In addition to the sodium metasilicate solution, each beaker contained various amounts of the inhibitor of the present invention ranging from 0-100 PPM. The pH of each beaker was adjusted to 7.5. The samples were stirred using a magnetic stirrer and allowed to stand at room temperature. Equal samples were taken at different times and SiO was determined spectrophotometrically using ammonium molybdate 2 . The results are shown in Table 1.

[0045] Table 1

[0046]

[0047] In another set of beaker experiments, in addition to sodium metasilicate, calcium chloride (990PPM, as CaCO 3 ) and magnesium sulfate (340PPM, as CaCO 3 count). The initial concentration of silicon oxide is 250PPM, with CaCO 3 count. The pH of each beaker was adjusted to 7.4. The results are shown in Table 2.

[0048] Table 2

...

Embodiment 2

[0055] Experimental Cooling Tower Experiment

[0056] A simulated cooling tower study was used to evaluate the effectiveness of silica inhibitors. The chemical composition of the make-up water of the tower is as follows:

[0057] 84.9g CaCl 2 2H 2 O / 250 gallons of make-up water;

[0058] 147.3g MgSO 4 ·7H 2 O / 250 gallons of make-up water;

[0059] 233.8g Na 2 SiO 3 5H 2 O / 250 gallons of make-up water; and

[0060] 56ml concentrated H 2 SO 4 / 100 gallons of make-up water.

[0061] The water was circulated until silica precipitated. The pH of the recirculated water was controlled at 7.8 and phosphonate scale inhibitors were used to control calcium carbonate precipitation. The dosage of silicon oxide inhibitor product was kept at 30PPM.

[0062] Blank experiments without silica inhibitor showed relatively low levels of silica and hardness before silica precipitation occurred. This experiment did not have a silica inhibitor, but had a calcium carbonate phosphonate ...

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Abstract

A method for inhibiting the formation and deposition of silica and silicate compounds in water systems comprising adding to the water in the water system an effective inhibiting amount of one or more water-soluble polymers of formula wherein M is a repeating unit obtained after polymerization of one or more monomers comprising a polymerizable carbon-carbon double bond; r is 0 to about 5 mole percent, s is 100 to about 95 mole percent; R1 is H or C1-C4 alkyl; R2 is a group of formula -(CH2-CHR3-O)n-; R3 is H or CH3, or a mixture thereof; and n is 2 to about 25.

Description

technical field [0001] The present invention generally relates to silica scale inhibitors. More specifically, the present invention relates to methods of inhibiting the formation and deposition of silica and silicate compounds in aqueous systems using polyoxyalkylene group-containing water-soluble polymers. Background technique [0002] In many parts of the world, amorphous silica scale can cause serious clogging problems when industrial water contains large amounts of silica. In most places, substantial amounts of silica mean that industrial waters contain at least 5 ppm and up to about 500 ppm dissolved silica, and may contain higher amounts of dissolved, dispersed, or colloidal forms of silica. [0003] The solubility of silica disadvantageously limits the effective use of water in industrial applications such as cooling, boilers, geothermal, reverse osmosis, and papermaking. Specifically, when minerals are concentrated during processing, their concentrations can exceed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C09K23/00C09K23/14
CPCC02F5/10C02F2303/08C02F2305/04C02F5/02
Inventor 亚斯波尔·S·吉尔斯利凯恩思·S·基德马比弗兰克·丰-跃·鲁约翰·D·莫里斯
Owner NALCO CO