Ferric ion stabilizing capability measurement method of acidification ferric ion stabilizer

A technology of iron ion stabilizer and determination method, which is applied in the direction of color/spectral characteristic measurement, etc., which can solve the problems of large influence of measurement result storage time, large method error, and low measurement result, so as to facilitate experimental operation and end point judgment , high precision, avoid the effect of repeated heating

Active Publication Date: 2012-06-27
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its advantage is that the titration end point jumps significantly, and the relative error of parallel determination is small; the disadvantage is that the method error is too large, because I- is easily oxidized to I by air under acidic conditions. 2 , the product Fe 2+ It is also easily oxidized to Fe by air 3+ , Fe 3+ Continue to oxidize I-, etc., resulting in low measurement results, and the measurement results are also greatly affected by the storage time

Method used

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  • Ferric ion stabilizing capability measurement method of acidification ferric ion stabilizer
  • Ferric ion stabilizing capability measurement method of acidification ferric ion stabilizer
  • Ferric ion stabilizing capability measurement method of acidification ferric ion stabilizer

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Experimental program
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Effect test

Embodiment 1

[0034] Reagent preparation

[0035] 5.0mg / mL standard ferric ion solution: Accurately weigh 6.0335g of ferric chloride hexahydrate (FeCl 3 ·6H 2O) in a beaker, after dissolving with distilled water, dissolve it in a 250mL volumetric flask, and shake it up for subsequent use;

[0036] 20% anhydrous sodium carbonate solution: Weigh 20.0g of anhydrous sodium carbonate into a thin-mouth plastic bottle, add 80mL of distilled water, shake well for later use;

[0037] 10% sulfosalicylic acid solution: weigh 10.0g sulfosalicylic acid into a narrow-mouth glass bottle, add 90mL distilled water, shake well for later use;

[0038] Buffer solution with pH=2.2: Pipette 230 mL of 0.2 mol / L hydrochloric acid solution and 250 mL of 0.2 mol / L potassium hydrogen phthalate solution, mix and dilute to 1000 mL with distilled water;

[0039] 0.01mg / mL iron standard solution: Accurately weigh 0.8634g iron ammonium alum [(FeNH 4 (SO 4 ) 2 12H 2 O] Put it in a beaker, add distilled water to diss...

Embodiment 2

[0055] Using this assay method, five different iron ion stabilizers were tested for their ability to stabilize iron ions, and the standard was added for recovery experiments. The results are shown in Table 2. It can be seen from Table 2 that the recovery rate of standard addition is in the range of 100±10%, and the accuracy is better.

[0056] Table 2 Iron ion stabilizer spiked recovery experimental results

[0057]

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Abstract

The invention relates to a ferric ion stabilizing capability measurement method of an acidification ferric ion stabilizer, which comprises the steps that: excess standard ferric ion solution is added into a certain amount of ferric ion stabilizer, so complex reaction is generated between all the ferric ion stabilizer and the standard ferric ion solution, then the pH is adjusted to between 5-6, the redundant Fe<3+> is hydrolyzed to generate the Fe(OH)3 flocculent precipitate, the precipitate is removed through centrifugation, all the supernatant is collected, and in the acid medium, a sulfosalicylic acid spectrophotometric method is utilized to test the total ferric content which is stabilized by the ferric ion stabilizer. The invention has the following advantages that: 1, the adopted method is simple and quick to operate, and has good repeatability and high precision; 2, the problems of multiple repeated heating, repeated diluting, finish determination and the like of the liquid do not exist in the adopted method, and the personal factor is prevented from influencing the test result; and 3, the test precision of the ferric ion content is high, and the test of the ferric ion is benefited.

Description

technical field [0001] The invention relates to a method for measuring the ability of an iron ion stabilizer for acidification to stabilize iron ions, and belongs to the field of petrochemical industry. Background technique [0002] During the acidizing operation of oil and water wells, the high-concentration acid solution will dissolve the iron compounds on the surface of the pipeline and equipment during the stirring and pumping process, and will erode the iron minerals and clay minerals in the rock after entering the formation. etchant, but also dissolves some iron. These dissolved irons generally appear as Fe in solution 2+ and Fe 3+ state exists. With the continuous reaction between the acid solution and the formation rock, the effective concentration of the acid solution gradually decreases and the pH value increases. When the pH of the acid rises to 2.2 (Fe 3+ When the concentration is 0.01mol / L), it starts to produce Fe(OH) 3 Precipitation; when the pH value of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 李俊华李俊莉李移乐刘彦锋任海晶
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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