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Method for detecting oxygen content in butadiene by utilizing semiconductor laser technique

A laser technology and butadiene technology, applied in the field of detection, can solve the problems of inability to realize automation, long analysis cycle, low precision, etc., and achieve the effects of accurate and reliable analysis results, convenient automatic control, and avoidance of damage.

Inactive Publication Date: 2009-09-30
SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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Problems solved by technology

This analysis method has the analysis period that is relatively long, and the content of butadiene in the production of the reaction device cannot be timely; the accuracy is not high (only up to 0.1%), and the consumption of chemical reagents is required. The process is very cumbersome and cannot be automated. Manual analysis can only be used. This analysis requires a lot of human resources and requires manual contact with sample analysis. It is easy to cause physical harm to manpower in the long run.

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  • Method for detecting oxygen content in butadiene by utilizing semiconductor laser technique
  • Method for detecting oxygen content in butadiene by utilizing semiconductor laser technique
  • Method for detecting oxygen content in butadiene by utilizing semiconductor laser technique

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Embodiment Construction

[0042] 1. Preparation before the experiment

[0043] First turn on the power of the LAG-4000 semiconductor laser instrument, and the instrument performs a self-test; after the instrument is running normally, perform a leak test on the bypass pipe and gas circuit to ensure that there is no leak in the gas circuit of the instrument analysis room. Then open the nitrogen valve and continuously feed high-purity nitrogen for 15 minutes to replace the analysis system to ensure that there is no oxygen in the analysis system.

[0044] 2. Sample analysis

[0045] Close the nitrogen valve and open the injection valve at the same time, so that the sample to be tested (industrial butadiene) enters the sample chamber of the analysis system. A laser beam with a wavelength of 760nm and an intensity of 1mW was emitted by a LAG-4000 semiconductor laser instrument to irradiate the sample. After measuring the irradiation, the oxygen content in the butadiene of the sample to be tested can be cal...

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Abstract

The invention provides a method for detecting oxygen content in industrial butadiene by utilizing a laser technique, comprising steps of irradiating the detected butadiene gas by utilizing a laser beam (only absorbed by oxygen) being 700-800 nm in wavelength and 0.5-1.5mW in strength, and obtaining the oxygen concentration of the detected butadiene gas by analyzing the attenuation of the laser intensity, wherein the attenuation of the laser intensity is in a functional relationship with the oxygen content in the detected butadiene gas. The method for detecting oxygen content in butadiene adopts the semiconductor laser technique to achieve fast detection of samples (less than 5 seconds), convenient operation, and exact and reliable analysis result (accuracy reaching 0.05 percent); the detection device has simple structure, convenient operation and safe and reliable detection process and prevents the detected samples from damaging workers.

Description

technical field [0001] The invention belongs to the technical field of detection and relates to a method for measuring the oxygen content in butadiene, in particular to a method for measuring the oxygen content in industrial butadiene by using semiconductor laser technology. Background technique [0002] In industrial production, the oxygen content in butadiene is a very important control index. Because butadiene is prone to peroxidation reaction in the presence of oxygen to form peroxides. Butadiene peroxide is reactive, an extremely unstable substance, and cannot be easily handled safely. With the expansion and wide application of petrochemical products, their potential dangers continue to increase, and they are prone to explosion under the effects of external impact force, friction, impact, thermal stimulation, etc. This accidental explosion has a very damaging effect on the surrounding area. Therefore, it is very important to detect the oxygen content in butadiene in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
Inventor 邢龙春刘海生刘沛李婷樊晓伟杜文选武克峰赵秀勤李斌许翠红
Owner SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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