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Chemical analysis method for ortho-toluenediamine and meta-toluenediamine in tar

A technology of m-toluenediamine and analysis method, which is applied in the field of chemical analysis, and can solve the problems of unfixed chemical composition, large difference in processing technology, and low detection accuracy.

Active Publication Date: 2015-12-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These detection methods have disadvantages such as low specificity, low detection sensitivity, low detection accuracy, and limitations in the scope of use.
In addition, due to the great difference in the processing technology of tar recovery, it is usually a combination of various irregularities and proportions, so that the chemical composition contained in it is not fixed, which brings great difficulties to the identification of tar recovery

Method used

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Examples

Experimental program
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Embodiment Construction

[0013] Below in conjunction with example the present invention will be further described.

[0014] GF254 silica gel plate was used as the stationary phase of thin-layer chromatography, petroleum ether: acetone = 3:8 was selected as the developer, and iodine vapor was used for color development. Preparation of activated plates: dry at 110°C for 60 minutes, and place in a desiccator for later use. The configuration of the spot plate standard solution: the standard solution (2,4-TDA ethylene glycol solution) is about 8g each time, and the required concentration is calculated according to the required concentration (1mg / g, 2mg / g, ... 9mg / g). Weigh the corresponding mass of TDA with an electronic balance, add it to a 10ml graduated test tube with stopper, and calculate the mass of ethylene glycol according to the mass and concentration of TDA.

[0015] Gas chromatography analysis, including the following steps: sample volume: 0.2μl; nitrogen pressure: 0.05MPa; hydrogen pressure: 0...

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Abstract

The invention discloses a chemical analysis method for ortho-toluenediamine and meta-toluenediamine in tar. The chemical analysis method comprises a thin-layer chromatographic analysis step and a gas-phase chromatographic analysis step. The chemical analysis method for ortho-toluenediamine and meta-toluenediamine provided by the invention is simple in realizing procedure, high in accuracy, strong in sensitivity and less in consuming time.

Description

technical field [0001] The invention belongs to the field of chemical analysis, in particular to a chemical analysis method for o- and m-toluenediamine in tar. Background technique [0002] At present, the market demand for toluene diisocyanate (TDI) is large, and it is reported that the global demand is about 1.5 million tons per year. It is expected that the market demand for TDI will increase by 5% in the next few years. The industrial production of TDI generally adopts the amine phosgenation method, and the main raw materials are toluenediamine (TDA) (especially meta-TDA) and phosgene. In recent years, the demand for TDI at home and abroad has soared, which has stimulated the production of TDA accordingly. At present, TDA produced in China is mainly produced by hydrogenation of dinitrotoluene (DNT), which is crude TDA, including water, solvent, meta-TDA, isomer ortho-TDA, tar and other components. The tar as waste still contains a large amount of meta-TDA, a small amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/90G01N30/02
Inventor 白芳华超陆平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI