Capillary chromatography detection process of mixed benzene
A capillary chromatography and capillary column technology, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as affecting accuracy and peak shape, difficulty in chromatographic analysis, and unsatisfactory separation, and achieve high accuracy, simple and fast operation. , the effect of great guiding significance
Active Publication Date: 2010-08-04
JIANGSU LONGCHANG CHEM
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Problems solved by technology
Due to similar structures and similar boiling points, there are certain difficulties in chromatographic analysis
At present, there are many methods for analyzing dichlorobenzene isomers by gas chromatography, such as: organosilicon bentonite packed column analysis, which is not ideal for the separation of trace m-dichlorobenzene in high-content p-dichlorobenzene; PEG-20M stainless steel packing Column or capillary column, OV-17 stainless steel packed column analysis, because the reaction between stainless steel and chloride affects the accuracy and peak shape of the measurement, and the time is long, close to or even more than 0.5 hours
Method used
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[0013] 1. Preparation before experiment
[0014] 1. Reagents and instruments
[0015] Chlorobenzene (analytical pure), p-dichlorobenzene (analytical pure), m-dichlorobenzene (analytical pure), o-dichlorobenzene (analytical pure), chloroform (analytical pure)
[0016] GC-9790 gas chromatograph, Zhejiang Zhida N2000 workstation, 30m*0.32mm*0.5um
[0017] SE-54 (cross-linked) high-efficiency capillary column, the number of theoretical plates > 2500 fast / m
[0018] 2. Conditions for chromatographic analysis of dichlorobenzene isomers
[0019] Column temperature: 100°C
[0020] Vaporization temperature: 260°C
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The invention discloses a capillary chromatography detection process of mixed benzene. The mixed benzene mainly comprises chlorobenzene, paradichlorobenzene, meta-dichlorobenzene, ortho-dichlorobenzene and little trichlorobenzene. The mixed benzene is placed into a gas chromatograph to be detected with a capillary column, and finally the detection result is obtained from the standard deviation value through multiple detection comparison. The invention is characterized in that the capillary column for detection is the cross linked SE-54 high efficiency capillary column, and in the experiment, specific conditions are designed for the capillary column, thus the chlorobenzene, paradichlorobenzene, meta dichlorobenzene, ortho-dichlorobenzene and little trichlorobenzene with similar structures and close boiling points can be effectively detected. The method has the characteristics of simple and rapid operation, high degree of accuracy and high precision and has certain instructive significance to process production.
Description
technical field [0001] The invention relates to a mixed benzene capillary chromatographic detection process, in particular to a mixed benzene capillary chromatographic detection process with simple and quick operation, high accuracy and high precision. Background technique [0002] The main components of mixed benzene include chlorobenzene, p-dichlorobenzene, m-dichlorobenzene and o-dichlorobenzene, and a small amount of trichlorobenzene. Dichlorobenzene isomers p-dichlorobenzene, m-dichlorobenzene, and o-dichlorobenzene are intermediates of dyes, pesticides, and medicines, and are also important organic solvents and anti-moth and anti-mold agents. Due to similar structures and similar boiling points, there are certain difficulties in chromatographic analysis. At present, there are many methods for analyzing dichlorobenzene isomers by gas chromatography, such as: organosilicon bentonite packed column analysis, which is not ideal for the separation of trace m-dichlorobenzene...
Claims
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Inventor 佘道才王兆昌吴春江杨海荣
Owner JIANGSU LONGCHANG CHEM
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