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Method for quantitatively detecting alkaline component in desulfurized alcohol lye

A quantitative detection method and technology of alkaline components, applied in the field of chemical analysis, can solve problems such as the inability to determine the content of alkaline components in sweetened lye

Pending Publication Date: 2019-05-31
SHANDONG JINGBO PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional acid-base titration method is only suitable for the determination of OH in sweetened lye - Concentration, unable to determine the content of each specific alkaline component in sweetened lye

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Prepare simulated sweetening lye, the content of NaOH in the simulated sweetening lye is 4.00wt%, Na 2 The content of S is 1.97wt%, Na 2 CO 3 The content is 2.62wt%. Quantitative detection is performed with the simulated sweetened lye as the solution to be tested, and the specific process includes:

[0105] Pipette 2mL of the solution to be tested and accurately weigh the mass. Put it in a 100mL beaker, add 75mL of distilled water, add 6 drops of Alizarin Yellow GG-Thymol Blue Indicator, and titrate with hydrochloric acid standard titration solution. The solution changes from green to blue, which is the first titration end point. At this time, the solution pH =10.0, write down the volume V of the standard titration solution consumed by the titration 1 (V 1 = 5 mL). During the titration process of this step, shake the Erlenmeyer flask quickly, and slowly drop in the hydrochloric acid standard titration solution, and the titration speed is about 60 drops / min.

[01...

Embodiment 2

[0121] Prepare simulated sweetening lye, the content of NaOH in the simulated sweetening lye is 6.00wt%, Na 2 CO 3 The content is 4.00wt%. Quantitative detection is performed with the simulated sweetened lye as the solution to be tested, and the specific process includes:

[0122] Pipette 2mL of the solution to be tested and accurately weigh the mass. Put it in a 100mL beaker, add 75mL of distilled water, add 6 drops of Alizarin Yellow GG-Thymol Blue Indicator, and titrate with hydrochloric acid standard titration solution. The solution changes from green to blue, which is the first titration end point. At this time, the solution pH =10.0, write down the volume V of the standard titration solution consumed by the titration 1 (V 1 = 6 mL). During the titration process of this step, shake the Erlenmeyer flask quickly, and slowly drop in the hydrochloric acid standard titration solution, and the titration speed is about 60 drops / min.

[0123] Then add 10mL formaldehyde and ...

Embodiment 3

[0134] Preparation of simulated sweetening lye, Na in the simulated sweetening lye 2 The content of S is 3.92wt%, Na 2 CO 3 The content of NaHS is 5.35wt%, and the content of NaHS is 0.70wt%. Quantitative detection is performed with the simulated sweetened lye as the solution to be tested, and the specific process includes:

[0135] Pipette 2mL of the solution to be tested and accurately weigh the mass. Put it in a 100mL beaker, add 75mL of distilled water, add 6 drops of Alizarin Yellow GG-Thymol Blue Indicator, and titrate with hydrochloric acid standard titration solution. The solution changes from green to blue, which is the first titration end point. At this time, the solution pH =10.0, write down the volume V of the standard titration solution consumed by the titration 1 (V 1 = 2 mL). During the titration process of this step, shake the Erlenmeyer flask quickly, and slowly drop in the hydrochloric acid standard titration solution, and the titration speed is about 6...

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Abstract

The invention belongs to the field of chemical analysis, in particular to a method for quantitatively detecting an alkaline component in a desulfurized alcohol lye. The method comprises the followingsteps of: a) mixing a desulfurized alcohol lye with an alizarin yellow GG-thymol blue indicator, and performing titration with hydrochloric acid until the color of the solution is changed from green to blue; b) mixing the titrimetric solution in the step a) and the formaldehyde and a phenolphthalein indicator, and performing titration with hydrochloric acid until the color of the solution is changed from red to colorless; c) mixing the titrimetric solution in the step b) and a bromocresol green-methyl red mixture indicator, and performing titration with hydrochloric acid until the color of thesolution is changed from green to dark red; and d) according to the hydrochloric acid amount consumed by titration in each step in the steps a)-c), calculating and obtaining the content of each alkaline component in the desulfurized alcohol lye. The method provided by the invention employs various indicators to perform step-by-step titration for the desulfurized alcohol lye to achieve the quantitative detection of the alkaline components in the desulfurized alcohol lye and provide the most true and effective data for operators.

Description

technical field [0001] The invention belongs to the field of chemical analysis, in particular to a quantitative detection method for alkaline components in sweetened lye. Background technique [0002] Demercaptan lye is the alkaline washing liquid used in the liquefied gas or gasoline sweetening process. Since the NaOH contained in the alkali washing liquid will undergo various chemical reactions during the mercaptan process, it will lead to the demercaptization of the sweetening lye. The ingredients become more complex during use. [0003] In the process of sweetening, the content change of each alkaline component in the sweetening lye will have a significant impact on the effect of sweetening, so in the process of sweetening, the specific content of each alkaline component in the sweetening lye used Regular measurements are necessary. However, the traditional acid-base titration method is only suitable for the determination of OH in sweetened lye - Concentration, unable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 付明义卢艳景栾波
Owner SHANDONG JINGBO PETROCHEM