Test method for chelating capability of chelating acid to metallic iron ions
A technology of chelating acid and chelating iron, which is applied in the direction of chemical analysis by titration method, can solve the problems of difficult test operation, many iron ion stabilizers, and difficult test operation results, and achieve good repeatability and easy popularization and use , the effect of simple operation
Inactive Publication Date: 2017-06-13
PETROCHINA CO LTD
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Problems solved by technology
At present, the chelating ability test method commonly used in laboratory experiments consumes more iron ion stabilizers, requires repeated heating, and the test operation is difficult. It is difficult to judge the results of the test operation accurately, resulting in the judgment of the stability of the iron ion stabilizer. to test purpose
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Embodiment 1
[0049] Reagent preparation:
[0050] 0.1mol / L ferric ammonium sulfate dodecahydrate solution: accurately weigh ammonium ferric sulfate dodecahydrate (NH 4 Fe(SO 4 ) 2 12H 2 O) 24.1g in a beaker, dissolved in distilled water and fixedly dissolved in a 500mL volumetric flask, shake well for later use.
[0051] 0.05mol / L EDTA standard solution: Accurately weigh 19g of ethylenediaminetetraacetic acid disodium salt, heat it, dissolve it in distilled water, and then dissolve it in a 1000mL volumetric flask, cool it, and shake it well for later use.
[0052] 2% sulfosalicylic acid solution: weigh 2.0g sulfosalicylic acid in a narrow-mouth glass bottle, add 98ml distilled water, shake well for later use.
[0053] The above reagents were all analytically pure.
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The invention provides a test method for chelating capability of chelating acid to metallic iron ions. The test method comprises the steps of taking chelating acid solution, titrating through EDTA standard solution to a destination in the presence of ammonium ferric sulfate dodecahydrate, then calculating out the chelating capability of the chelating acid to the iron ions according to a formula (1) and expressing through amount of chelating iron ions in a sample. In the formula, omega (Fe) is iron ion chelating capability mg / g, V1 is the volume mL of consumed EDTA standard solution, V2 is the volume mL of blank experiment consumed EDTA standard solution, C2 is the concentration mol / L of the EDTA standard solution, m2 is the weight g of the sample, V3 is the volume mL calibrated by a 500mL volumetric flask, and V4 is the volume mL calibrated by a 5mL transfer pipette. The test method disclosed by the invention is simple and quick to operate, has good repeatability and is easy to popularize and apply.
Description
technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for testing the ability of chelating acid to chelate metal iron ions. Background technique [0002] Acidizing operation is an important measure to ensure increased production and injection in oilfield development. During the stirring and pumping reaction, the acid solution will dissolve pipelines, equipment and formation clay minerals to generate iron ions. The iron ion stabilizer makes iron ions form stable complex ions, no precipitation occurs in the residual acid solution, and the secondary pollution caused by acidification to the formation is avoided, so the iron ion stabilizer is added to the acid solution. [0003] In order to ensure the function of the stabilizer, its quality is evaluated, so as to screen out high-quality iron ion stabilizers, so as to achieve the purpose of improving the success rate of acidizing process, prolonging the effective period of ...
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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 邓志颖姚斌陆小兵王勇宋昭杰隋蕾王尔珍
Owner PETROCHINA CO LTD
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