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Method for preparing blank solution in PT base value determination method

A technology of blank solution and preparation method, applied in chemical analysis by titration method, etc., can solve the problems of unstable alkali value determination, change of titrant concentration, inaccuracy, etc., and achieve reliable technical guarantee, accuracy, and error. reduced effect

Active Publication Date: 2019-05-31
SHAANXI SHANHUA COAL CHEM IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] During the inspection of PT semi-finished products and finished products, it was found that the stability and accuracy of the base value measurement results were not enough, resulting in large errors in the base value measurement results
After separate analysis of multiple factors and parameters, the determination of the base number may be affected by the following factors: 1. Although the beaker and magnetic stirrer used for the determination are cleaned as required, the determination of the base number is relatively sensitive and may still be affected; 2. The burette may not be Accurate; 3. The titration data may be inaccurate due to the control system problem of the potentiometric analyzer; 4. The concentration of the titrant changes
Through the separate analysis of the above four factors, it is found that the unstable and inaccurate determination of the base value is caused by the preparation method of the blank solution

Method used

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  • Method for preparing blank solution in PT base value determination method
  • Method for preparing blank solution in PT base value determination method
  • Method for preparing blank solution in PT base value determination method

Examples

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Embodiment 1

[0029] This embodiment provides a method for preparing a blank solution in a PT base value determination method, comprising the following steps:

[0030] Prepare the solution before preparing the solution. Wash the glass bottle, the magnet of the stirring device, the measuring cylinder, the beaker, the alkaline burette, the glass bottle stopper, etc. repeatedly with distilled water for 3 to 5 times, and dry them for later use.

[0031] Step 1: Add 9500ml of methanol solution with a content of 99.9% into the glass bottle, then add 400ml of high-purity water and 0.8ml of 0.5mol / L sodium hydroxide solution into the methanol solution, and put 2 to 3 magnets into the glass bottle. Stir in a glass bottle with a magnetic stirring device, and stir for the first time for 8 hours to make a methanol solution of sodium hydroxide;

[0032] Step 2: leave the methanol solution of sodium hydroxide in step 1 open for 12 hours at room temperature;

[0033] Step 3: Stir the methanol solution of...

Embodiment 2

[0036] This embodiment provides another method for preparing a blank solution in the PT base value determination method, which includes the following steps:

[0037] Prepare the solution before preparing the solution. Wash the glass bottle, the stirring rod of the stirring device, the measuring cylinder, the beaker, the alkaline burette, the glass bottle stopper, etc. repeatedly with distilled water for 3 to 5 times, and dry them for later use.

[0038] Step 1: Add 9500ml of methanol solution with a content of 99.9% to the glass bottle, then add 400ml of high-purity water and 0.8ml, 0.5mol / L sodium hydroxide solution to the methanol solution, put the stirring rod into the glass bottle and use the stirring device Stir, make the methanol solution of sodium hydroxide through first stirring 8h;

[0039] Step 2: leave the methanol solution of sodium hydroxide in step 1 open at room temperature for 12 hours;

[0040] Step 3: Stir the methanol solution of sodium hydroxide in step 2 ...

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Abstract

The invention provides a method for preparing a blank solution in a PT base value determination method. The method comprises the following steps of: the step 1: adding 9500ml of a 99.9% methanol solution to a glass bottle, adding 400ml of distilled water to the methanol solution, adding 0.8ml of 0.5mol / L sodium hydroxide solution, and stirring the mixture for 8 hours at the first time to prepare amethanol solution of sodium hydroxide; the step 2: performing standing of the methanol solution of sodium hydroxide obtained in the step 1 in an open state at a room temperature; and the step 3: performing stirring of the methanol solution of sodium hydroxide for the second time, and employing a bottle cap to cover the methanol blank solution of sodium hydroxide for standby. The base value of thepolytetrahydrofuran prepared in the invention is employed to measure the blank solution to reduce the number of times of the measurement of the blank solution, improve the measurement accuracy of thePT base value and improve the finished product of the PT product.

Description

technical field [0001] The invention relates to the technical field of detection methods for polytetrahydrofuran, in particular to a method for preparing a blank solution in a PT base value determination method. Background technique [0002] Polytetrahydrofuran (PTMEG hereinafter referred to as PT), also known as polytetrahydrofuran diol, polytetramethylene ether glycol, polytetramethylene glycol, polytetramethylene glycol ether, polytetramethylene glycol, is a kind of alcohol , esters, ketones, aromatic hydrocarbons and chlorinated hydrocarbons, white waxy solid insoluble in aliphatic hydrocarbons and water, polytetrahydrofuran is a white solid at room temperature, it becomes a colorless transparent liquid after melting, and becomes a transparent liquid when the temperature exceeds room temperature. PT can be used in many industries such as clothing, medical treatment, and machinery manufacturing, such as tires, transmission belts, gaskets, coatings, artificial leather, fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 封建利高立东边利利孟茸茸孙娟李海侠
Owner SHAANXI SHANHUA COAL CHEM IND GRP
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