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Method for determining ethanol and isopropyl benzene contents of air and waste gas

A determination method and technology for cumene, which are applied in measurement devices, instruments, scientific instruments, etc., can solve the problem that ethanol and cumene cannot be sampled and analyzed at the same time, so as to reduce sampling and analysis steps, achieve good technical effects, and improve The effect of work efficiency

Inactive Publication Date: 2015-12-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem that ethanol and cumene in air and waste gas cannot be sampled and analyzed simultaneously in the prior art, and a new method for measuring the content of ethanol and cumene in air and waste gas is provided

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  • Method for determining ethanol and isopropyl benzene contents of air and waste gas

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Effect test

Embodiment 1

[0014] Determination of ethanol and cumene in the exhaust gas of a dicumyl peroxide production unit.

[0015] 1. Instruments and accessories

[0016] (1) Agilent 6890N gas chromatograph,

[0017] (2) Chromatographic column: HP-FFAP, 30m×0.53mm×1.0μm.

[0018] (3) 2mL sample bottle with PTFE sealing silicone rubber gasket.

[0019] 2. Materials and reagents

[0020] (1) Ethanol, cumene, dimethylformamide, and carbon disulfide are all chromatographically pure with a purity of ≥99.5%.

[0021] (2) High-purity nitrogen: purity ≥99.999%.

[0022] (3) Activated carbon tube: 100mg in the front section and 50mg in the back section.

[0023] (4) Desorption solution: 60:40 (v / v) carbon disulfide / dimethylformamide mixed solution.

[0024] 3. Sampling work

[0025] At the sampling point (exhaust gas temperature 26.5°C, air pressure 101.2kPa), a 15-minute exhaust gas sample was collected with an activated carbon tube at a flow rate of 0.1L / min. After sampling, immediately seal both ends of the activated ...

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Abstract

The invention relates to a method for determining ethanol and isopropyl benzene contents of air and waste gas, and mainly aims to solve the problem that ethanol and isopropyl benzene cannot be sampled and analyzed at the same time in the air and the waste gas in the prior art. The method for determining ethanol and isopropyl benzene contents of the air and the waste gas comprises the following steps: (1) sampling with an activated carbon tube at a sampling point, immediately enclosing the two ends of the activated carbon tube after sampling, and waiting for determination; (2) opening the activated carbon tube collected in the step (1) during detection, pouring activated carbon into a solvent desorption bottle, and extracting upper-layer desorption solution for determination; (3) injecting the desorption solution obtained in the step (2) into a gas chromatograph, quantitatively analyzing under a certain chromatographic condition, and dividing a detection result by a sampling volume to obtain the concentrations of the ethanol and the isopropyl benzene in the air and the waste gas at a workplace. If the sample concentrations exceed a detection range, the problem is well solved by determination after dilution with the desorption solution. The method can be applied to determination of the ethanol and isopropyl benzene contents.

Description

Technical field [0001] The invention relates to a method for determining the content of ethanol and cumene in air and waste gas. Background technique [0002] Ethanol is an important solvent that can dissolve a variety of organic and inorganic substances. The rate of ethanol metabolism mainly depends on the content of enzymes in the body, which has large individual differences and is related to genetics. Ethanol is addictive and carcinogenic. Long-term exposure to high concentrations of ethanol can cause symptoms such as headache, dizziness, irritability, fatigue, and nausea. However, in the standard method for the determination of toxic and hazardous substances in the workplace air formulated by the Ministry of Health, there is no method for the determination of ethanol, and there is no provision for the allowable limit of ethanol in the workplace air. Cumene can irritate the skin and mucous membranes and is harmful to the spleen and liver. Due to its slow excretion, it can ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N1/22
Inventor 肖寒魏新明邹兵姜素霞高翔马明李明哲
Owner CHINA PETROLEUM & CHEM CORP
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