What are the detection methods of peroxides in methyl methacrylate?

What are the detection methods of peroxides in methyl methacrylate?

Methyl Methacrylate (MMA) is an important organic chemical product, which is widely used in plastics, coatings, adhesives and other fields. During synthesis and storage, MMA may generate peroxides, which not only affects its performance, but may also cause safety hazards. Therefore, the detection of peroxide content in MMA is particularly important. This article will introduce several commonly used peroxide detection methods, and analyze their advantages and disadvantages.

1. peroxide detection principle

Peroxide is usually produced by oxidation of double bonds and is a highly reactive substance. In MMA, peroxide formation is mainly related to oxygen and temperature. Detection methods for peroxides are generally based on their chemical or physicochemical properties, such as color change, spectral characteristics, electrochemical response, etc.

2. high performance liquid chromatography (HPLC)

High performance liquid chromatography is a commonly used detection method with high sensitivity and high selectivity. Through the MMA sample after proper pretreatment, injection into the liquid chromatograph, the use of column separation of peroxide and other components, and then through the UV detector or fluorescence detector for detection. The detection limit of HPLC method is low, which is suitable for the detection of trace peroxide.

Advantages:

• Sensitivity is high, selectivity is good.
The
• operation is simple and the result is accurate.
• Suitable for complex sample detection.

Disadvantages:

• Equipment costs are high and maintenance is complex.
• Pre-processing time is longer, consumables consumption is large.

3. gas chromatography-mass spectrometry (GC-MS)

Gas chromatography-mass spectrometry combines the separation ability of gas chromatography and the identification ability of mass spectrometry, which can realize the separation and qualitative and quantitative analysis of peroxide at the same time. After extraction and purification, the samples were separated by gas chromatography and detected by mass spectrometry. The GC-MS method has high sensitivity and resolution, and is suitable for the detection of trace peroxides.

Advantages:

• Separation and identification ability, the results are reliable.
• Operation automation is high, suitable for laboratory use.
• Can simultaneously detect multiple compounds.

Disadvantages:

The
• cost is high and the equipment is complex.
• The pre-treatment process is cumbersome and time-consuming.

4. chemical titration method

The chemical titration method is a classical detection method based on the chemical reaction of a peroxide with a specific reagent. For example, the peroxide content can be calculated by titrating the change in volume of the reaction using the reaction of peroxide with dimethylglyoxime (Dithiooxamide) to form a specific product. This method is simple, low cost, suitable for rapid detection in mass production.

Advantages:

The
• operation is simple and the cost is low.
• Suitable for on-site rapid detection.

Disadvantages:

The
• sensitivity is low and it is difficult to detect trace peroxides.
• Affected by the sample matrix, the results may not be accurate.

5. sensor detection method

In recent years, sensor detection technology has been gradually applied to the detection of peroxides. This method takes advantage of the oxidation characteristics of peroxides, and its concentration is directly detected by an electrochemical sensor or an optical chemical sensor. The sensor detection method is fast, sensitive and portable, which is suitable for on-line detection and industrial process control.

Advantages:

• Response speed is fast, suitable for online detection.
• No complex pre-treatment, easy to operate.
• Cost is low, suitable for large-scale applications.

Disadvantages:

• Sensitivity and selectivity may be limited.
• Requires regular calibration and maintenance costs are high.

6. spectrum detection method

The spectral detection method is based on the characteristic absorption spectrum of the peroxide. For example, the content of peroxide is determined by analyzing the absorption characteristics of a sample using ultraviolet-visible spectroscopy (UV-Vis) or infrared spectroscopy (FTIR) techniques. This method does not require complex sample preparation and is suitable for rapid detection.

Advantages:

• Operation is simple, without pre-treatment.
• Suitable for online and non-destructive testing.

Disadvantages:

• Sensitivity and selectivity may be limited.
• Susceptible to sample matrix interference, the result accuracy may be affected.

7. summary and prospect

There are various methods for the detection of peroxides in methyl methacrylate, and each method has its advantages and disadvantages. High performance liquid chromatography and gas chromatography-mass spectrometry have high sensitivity and high accuracy, suitable for laboratory analysis; chemical titration and sensor detection method are simple to operate, suitable for on-site rapid detection; spectral detection method is suitable for on-line monitoring. With the continuous development of detection technology, more efficient and sensitive detection methods will be applied to the detection of peroxides in MMA in the future, so as to provide a stronger guarantee for product quality and safety.