Preparation method of pesticide residue level benzene

A technology of pesticide residue grade and adsorption column, which is applied in chemical instruments and methods, purification/separation of hydrocarbons, adsorption purification/separation, etc., can solve the requirements of trace detection, many impurity interference peaks, and the price of imported products Advanced problems, to achieve the effect of simple operation and wide application prospects

Active Publication Date: 2017-02-01
中国船舶集团有限公司第七一八研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, currently domestically produced analytical pure benzene and chromatographically pure benzene contain too many impurity interference peaks, most of which cannot meet the requirements of trace detection, which makes domestic laboratories engaged in the development and production of standard gases and trace detection Most of the high-purity benzene reagents produced by foreign companies are used, and the price of imported products is high, which limits the detection work. Therefore, it is of great practical significance to study the preparation method of pesticide residue grade benzene

Method used

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  • Preparation method of pesticide residue level benzene
  • Preparation method of pesticide residue level benzene
  • Preparation method of pesticide residue level benzene

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Experimental program
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Effect test

Embodiment 1

[0030] Step 1. the analytical pure benzene in the reagent bottle 1 is introduced in the adsorption column 3 that desulfurizer is housed by liquid metering pump 2, abandons the benzene of the former volume fraction 10% that flows out from adsorption column 3, then will from adsorption The remaining benzene flowing out in the column 3 is introduced in the drying column 4 that anhydrous calcium chloride is housed and dried;

[0031] Wherein, the carrier of the desulfurizing agent is activated alumina with a particle size of 1.5mm, and the active component is a mixture of copper, palladium, indium and lanthanum; The mass fractions are copper 10%, palladium 0.05%, indium 0.01% and lanthanum 0.05%;

[0032] Step 2. discards the benzene of the previous volume fraction 5% that flows out from drying column 4, then introduces in the there-necked flask 9 the remaining benzene that flows out from drying column 4;

[0033] Step 3. Heat the benzene in the three-necked flask 9 to 75°C to 81...

Embodiment 2

[0038] Step 1. the analytical pure benzene in reagent bottle 1 is introduced in the adsorption column 3 that desulfurizer is housed by liquid metering pump 2, abandons the benzene of the former volume fraction 15% that flows out from adsorption column 3, then will from adsorption The remaining benzene flowing out in the column 3 is introduced in the drying column 4 equipped with 4A molecular sieves and dried;

[0039] Wherein, the carrier of the desulfurizer is a zeolite molecular sieve with a particle size of 2.5mm, and the active components are copper, palladium, tin and lanthanum; the total mass of the desulfurizer is 100%, and the mass of each active component in the desulfurizer is The fraction is copper 15%, palladium 0.05%, tin 0.05% and lanthanum 0.02%;

[0040] Step 2. discards the benzene of the former volume fraction 10% that flows out from drying column 4, then introduces in the there-necked flask 9 the remaining benzene that flows out from drying column 4;

[004...

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Abstract

The invention relates to a preparation method of pesticide residue level benzene, and belongs to the technical field of chemical reagents. The method comprises the following steps: introducing analytic pure benzene into an adsorption column filled with a desulfurizing agent for adsorption and impurity removal, then introducing the analytic pure benzene into a drying column filled with a drying agent for drying, performing rectification, removing front fractions and collecting a product to obtain the pesticide residue level benzene. The pesticide residue level benzene prepared by the preparation method can meet the requirements on trace analysis in the scientific research and physical and chemical detection fields such as gas preparation, food analysis and environmental analysis; furthermore, the method is easy to operate, low in cost and easy to implement, and has wide application prospect.

Description

technical field [0001] The invention relates to a method for preparing pesticide residue grade benzene, which belongs to the technical field of chemical reagents. Background technique [0002] Pesticide residue grade reagent is a high-purity reagent specially used for trace analysis in scientific research and physical and chemical testing fields such as environmental analysis, standard gas preparation and food analysis. The impurity components in the raw materials used for standard gas preparation will affect the accuracy of the standard gas value; the trace analysis detection content in physical and chemical analysis such as environmental analysis and food analysis is generally in ppm (10 -6 ) and ppb (10 -9 ) level, once a trace of contamination occurs in the test sample, it may cause errors in the test results. Therefore, in order to reduce pollution in actual testing, the reagents used should be high-purity reagents. [0003] However, currently domestically produced an...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/05C07C7/12C07C15/04
CPCC07C7/005C07C7/05C07C7/12C07C15/04
Inventor 龙庆云韦桂欢董云峰张洪彬杨品代伟娜李占强
Owner 中国船舶集团有限公司第七一八研究所
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