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Measurement method for water content in organic solution

A technology of organic solution and measurement method, which is applied in the preparation of test samples, material resistance, etc., can solve problems such as insecurity and large errors, and achieve the effects of short time consumption, simple operation and high test accuracy.

Active Publication Date: 2015-05-13
GUIZHOU ANDA TECH ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem of unsafe and large error in the method for measuring the moisture content in the organic solution in the prior art, the present invention provides a method for measuring the moisture content in the organic solution, which has high measurement accuracy, short time, convenient operation and safety

Method used

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  • Measurement method for water content in organic solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example is used to illustrate the method for measuring the moisture content in the organic solution disclosed in the present invention.

[0026] Mix 25g of high-purity N-methylpyrrolidone (NMP) with a purity greater than 99.9% and 25g of high-purity water (conductivity greater than 10M ohms) to form an organic solution with a moisture content of 50%.

[0027] Add 0.05 g of sodium chloride to the organic solution to form the test sample A1.

[0028] Test the conductivity of the sample to be tested with a Mettler Tortoise conductivity meter, and then calculate the moisture content in the organic solution based on Y=0.0613X+35.161.

Embodiment 2

[0030] This example is used to illustrate the method for measuring the moisture content in the organic solution disclosed in the present invention.

[0031] Mix 15g of high-purity N-methylpyrrolidone (NMP) with a purity greater than 99.9% and 35g of high-purity water (conductivity greater than 10M ohm) to form an organic solution with a moisture content of 70%.

[0032] Add 0.05 g of sodium chloride to the organic solution to form sample A2 to be tested.

[0033] Test the conductivity of the sample to be tested with a Mettler Tortoise conductivity meter, and then calculate the moisture content in the organic solution based on Y=0.0613X+35.161.

Embodiment 3

[0035] This example is used to illustrate the method for measuring the moisture content in the organic solution disclosed in the present invention.

[0036] Mix 10g of high-purity N-methylpyrrolidone (NMP) with a purity greater than 99.9% and 40g of high-purity water (conductivity greater than 10M ohms) to form an organic solution with a water content of 80%.

[0037] Add 0.05g of sodium chloride to the organic solution to form the test sample A3.

[0038] Test the conductivity of the sample to be tested with a Mettler Tortoise conductivity meter, and then calculate the moisture content in the organic solution based on Y=0.0613X+35.161.

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Abstract

The invention provides a measurement method for water content in organic solution. The method comprises the following steps: S1, water-soluble strong electrolyte is added in non-conducting organic solution to obtain a sample to be measured, wherein the organic solution comprises organic solvent and water, and the mass ratio of the mol number of positive charges formed in the sample to be measured and the organic solvent is 1.70*10-5 mol / g: 1.72*10-5 mol / g; S2, the electric conductivity of the sample to be measured is measured as X us / cm; and S3, Y is calculated according to the formula of Y=0.0613X+35.161, and the water content in the organic solution is Y%. The measurement method provided by the invention has the advantages of high measurement precision, short time, convenience in operation and safety.

Description

technical field [0001] The invention relates to a method for measuring the moisture content in an organic solution. Background technique [0002] The amount of water in the organic solution is an important indicator of the quality of the organic solution, which directly affects the performance of the organic solution, and is crucial to precise synthesis and separation tests. Existing test methods include weight loss (differential heat), rectification, extraction, Metrohm Karl Fischer moisture analyzer, GC (gas chromatography), density method and other test methods. [0003] Among them, the most widely used method is the Karl Fischer method. In order to improve the accuracy of determining the end point, permanent stop titration or potentiometric titration is often used, but the sensitivity is still low, the preparation of reagents is cumbersome, the preparation conditions are harsh, and pyridine has a foul smell, which pollutes the environment and will damage the health of o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/06G01N1/38
Inventor 刘建波
Owner GUIZHOU ANDA TECH ENERGY CO LTD