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Method for investigating purity of retrieved ethanediol

A test method, the technology of ethylene glycol, is applied in the direction of chemical analysis by titration, material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, etc., which can solve the problem of recovering ethylene glycol. Apply for patents and other issues to achieve high accuracy, reduce unit consumption, and good precision

Inactive Publication Date: 2006-11-29
PETROCHINA CO LTD
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Problems solved by technology

[0004] There is no patent application for the research and development of the test method for the purity of recovered ethylene glycol at home and abroad

Method used

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Experimental program
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Embodiment Construction

[0019] Determination principle

[0020] In an acidic medium, periodic acid can quantitatively oxidize alcohols on adjacent carbon atoms on hydroxyl groups, and other alcohols such as diethylene glycol do not participate in the reaction, so the indirect iodometric method can be used to determine the content of ethylene glycol. The reaction is as follows:

[0021]

[0022]

[0023]

[0024]

[0025] Instruments and Reagents

[0026] iodine measuring bottle 250ml

[0027] Acid Burette 50ml

[0028] Pipette 20ml 5ml

[0029] Volumetric flask 1000ml 250ml

[0030] Periodic acid solution: weigh 5±0.01g HIO 4 ·2H 2 O, added to a 1000ml volumetric flask, diluted with 1:2 sulfuric acid to 1000ml, and stored in a brown bottle for later use.

[0031] Na 2 S 2 O 3 Standard solution: C(Na 2 S 2 O 3 )=0.1mol / L

[0032] 20% KI solution: ready-made

[0033] 1+2 sulfuric acid solution: 1 volume of concentrated sulfuric acid is dissolved in two volumes...

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Abstract

The invention is a testing method of recovered glycol purity, weighing 0.6-0.8g of glycol sample and placing it into 250 ml volumetric flask and diluting with water to scale and shaking uniformly; using pipette to absorb 5 ml of solution obtained and adding in 250 ml iodine measuring flask and absorbing 20 ml of high-iodine solution and adding in the iodine measuring flask and shaking uniformly; placing for 30 min in 45 deg.C constant temperature water bath and taking out and cooling to room temperature; adding in 10 ml of 20% KI solution and 100 ml of water, and placing in dark place for 10 min and titrating with 0.1 mol / L Na2S2O3 to buff; adding in 1 ml of 1% starch indicator and continuing titrating until blue disappears, able to directly reflect concrete value of glycol purity and accurately find measuring proportion to new glycol without special instrument, and the invention has characters of simple and convenient, rapid, highly accurate and good precision.

Description

Technical field: [0001] The present invention relates to the field of chemical industry, in particular, it is a test method for recovering the purity of ethylene glycol. Background technique: [0002] Ethylene glycol is one of the important raw materials for the production of polyester plants. The analysis of the incoming raw material ethylene glycol is usually carried out in accordance with the requirements of the national standard. Evaluation of alcohol purity and quality. However, there are certain purity requirements for the ethylene glycol used in the online circulation of the device, and the content of recycled ethylene glycol cannot be accurately quantified only by the determination of distillation range, density and moisture. [0003] Due to the water-containing ethylene glycol produced in the polycondensation process, the device adopts a recovery process to distill refined ethylene glycol through rectification, dehydration, and delighting to obtain ethylene glycol ...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N31/16
Inventor 孙存云陈蓝天易光硕
Owner PETROCHINA CO LTD
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