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Crude benzene detection method

A detection method, crude benzene technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of benzene vapor reducing the accuracy of detection results, toxicity, human and environmental hazards, and difficult operation control, so as to shorten the test time and reduce the Harmful to people and the environment, easy to operate

Inactive Publication Date: 2013-06-12
吉林建龙钢铁有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the traditional method of detecting crude benzene, some benzene will be turned into benzene vapor, which will enter the human body through the ears, nose, mouth, skin, etc. to cause poisoning; when benzene vapor is mixed with air in a certain proportion , it will explode when encountering an open flame, causing a safety accident, and the toxicity produced in the distillation will cause harm to people and the environment; and the loss of benzene vapor will reduce the accuracy of the test results
Moreover, the traditional method for detecting crude benzene is cumbersome and difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Prepare the mixed standard solution of benzene, toluene, xylene and naphthalene, wherein the mass concentration of benzene is , the mass concentration of toluene is , the mass concentration of xylene is , and the mass concentration of naphthalene is ;

[0067] Inject the obtained standard solution into a gas chromatograph for gas chromatographic detection. The column temperature adopts a temperature-programmed method, with an initial temperature of 60°C, rising to 160°C at a rate of 5°C / min, and then rising to 160°C at a rate of 10°C / min. 180°C, then raised to 230°C at a rate of 15°C / min; the temperature of the gasification chamber is 250°C; the temperature of the detector is 250°C; the carrier gas is high-purity nitrogen, the pre-column pressure is 2.85psi; the flow rate of hydrogen is 40mL / min ; The air flow rate is 400mL / min; the make-up volume is 3.7mL / min; the injection volume is 0.4μL. Detect and obtain the gas chromatogram of standard solution, the result is as f...

Embodiment 2~53

[0072] The present invention detects the collected 52 crude benzene samples by gas chromatography. The temperature of the column adopts a temperature-programmed method. The initial temperature is 60°C, and it rises to 160°C at a rate of 5°C / min, and then rises to 160°C at a rate of 10°C / min. to 180°C, and then raised to 230°C at a rate of 15°C / min; the temperature of the gasification chamber is 250°C; the temperature of the detector is 250°C; the carrier gas is high-purity nitrogen, the pre-column pressure is 2.85psi; min; the air flow rate is 400mL / min; the make-up volume is 3.7mL / min; the injection volume is 0.4μL;

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Abstract

The invention provides a crude benzene detection method. Gas chromatography detection is performed on crude benzene to be detected, and a gas chromatography map is obtained. The crude benzene detection method research shows that in the gas chromatography map, a constituent corresponding to a chromatography peak before peak appearance of a naphthaline chromatography peak is a constituent contained in a fraction of crude benzene below 180 DEG C, peak areas of all chromatography peaks before the peak appearance of the naphthaline chromatography peak in the gas chromatography map, and peak areas of all chromatography peaks in the gas chromatography peak map are obtained through computation with the detection method, and therefore the mass content of the fraction of the crude benzene below 180 DEG C is obtained. Detection results obtained with the detection method are high in accuracy, an analysis cycle can be shortened, and production efficiency is improved. Experiment results show that the accuracy of the detection method is above 98%, and detection analysis for the crude benzene can be accomplished within 25 minutes.

Description

technical field [0001] The invention relates to the technical field of crude benzene recovery, in particular to a detection method of crude benzene. Background technique [0002] Crude benzene is one of the products in the crude gas produced by coal pyrolysis. It is a benzene series compound recovered from the coke oven gas after deamination, of which benzene is the main content. The active components in crude benzene are benzene, toluene, and xylene, with a total content of about 85% to 90%. The main components in crude benzene are all distilled out before 180°C, and the distillate after 180°C becomes solvent oil. When determining the content of each component in crude benzene and calculating the yield, the amount of distillation before 180°C is usually regarded as 100% for calculation, so the amount of distillation before 180°C is used as one of the indicators to identify the quality of crude benzene. [0003] The amount of crude benzene distilled before 180°C depends on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 韩计委吴飞
Owner 吉林建龙钢铁有限责任公司