Method for testing chelating ability of chelating acid to metal calcium ions

A technology of chelating acid and chelating calcium, which is applied in the direction of chemical method analysis, material analysis by observing the influence on chemical indicators, measuring devices, etc. It can solve the problem that the judgment of calcium ion stability cannot be easily achieved by testing, It is difficult to accurately judge the test operation results and the test operation is difficult, etc., to achieve the effect of easy promotion and use, realization of evaluation, and simple operation

Inactive Publication Date: 2018-07-10
PETROCHINA CO LTD
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Problems solved by technology

[0003] At present, the chelating ability test method commonly used in laboratory experiments is mainly to observe the precipitation by uniformly mixing acid solution with sodium carbonate and calcium chloride solution. This process requires repeated addition of sodium hyd

Method used

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  • Method for testing chelating ability of chelating acid to metal calcium ions
  • Method for testing chelating ability of chelating acid to metal calcium ions
  • Method for testing chelating ability of chelating acid to metal calcium ions

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[0053] Example 1

[0054] Reagent preparation:

[0055] 0.25mol / L calcium acetate solution: accurately weigh 40g of pure calcium acetate, dilute it with distilled water in a 1000mL volumetric flask to the mark, shake well for use.

[0056] NH 3 -NH 4 Cl buffer solution: Dissolve 54g NH with distilled water 4 Cl and 350 ml of ammonia water, the buffer solution has a pH value of 10, and the volume is adjusted to 1000 ml with a volumetric flask, and shake well for use.

[0057] Mixed indicator: accurately weigh 40g, 2g, 1g of potassium chloride, naphthol green B, and acid chrome blue K, dilute with distilled water to a 1000mL volumetric flask to the mark, shake well for use.

[0058] The above reagents are of analytical grade.

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Abstract

The invention provides a method for testing the chelating ability of a chelating acid to metal calcium ions. The method comprises the following steps: taking a chelating acid solution, titrating the chelating acid solution by using a calcium acetate standard solution in the presence of a buffer solution until an end point is reached, calculating the chelating ability of the chelating acid to the calcium ions according to formula (1), and representing the chelating ability by the amount of the sample chelated calcium ions: omega(Ca) = (C1*V1*M)/(m1/V2*V3), wherein omega(Ca) representing the calcium ion chelating ability, mg/g; C1 representing the concentration of the calcium acetate solution, mol/L; V1 representing the consumption volume of the calcium acetate solution, mL; M representing the molar mass of calcium, g/mol; m1 representing the mass of the sample, g; V2 representing an accurate volume value after 500 mL volumetric flask calibration, mL; and V3 representing an accurate volume value after 100 mL pipet calibration, mL. The determination method has the advantages of simplicity and rapidness in operation, and easiness in promotion and use.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for testing the chelating ability of chelating acid to metal calcium ions. Background technique [0002] Acidizing operation is an important measure to ensure increased production and injection in oilfield development. The main mechanism of sandstone acidification is the reaction of hydrofluoric acid with aluminosilicate and fluoroaluminate, but calcium hydroxide precipitation may be formed during the reaction. Therefore, whether the effective chelation of precipitated ions can be realized is an important index to investigate the performance of chelating acid. [0003] At present, the chelating ability test method commonly used in laboratory experiments is mainly to observe the precipitation by uniformly mixing the acid solution with sodium carbonate and calcium chloride solutions. This process requires repeated addition of sodium hydroxide solution to adjust the p...

Claims

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Application Information

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IPC IPC(8): G01N21/79G01N31/16
CPCG01N21/79G01N31/162
Inventor 隋蕾邓志颖陆红军姚斌张随望陆小兵王勇宋昭杰王尔珍
Owner PETROCHINA CO LTD
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