Method for detecting concentration of pentacarbonyl iron in carbon monoxide gas

Abstract

The invention discloses a method for detecting the concentration of pentacarbonyl iron in carbon monoxide gas. The method comprises specific steps as follows: preparation of standard solutions of iron, preparation of an absorption liquid, collection of samples, measurement by an atomic absorption spectrophotometer, drawing of a standard curve, calculation of the concentration of iron in a sample solution and calculation of the concentration of the pentacarbonyl iron in the carbon monoxide gas. The method is simple and fast to operate, and the measurement result is accurate and reliable.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for detection of iron pentacarbonyl content in gas. Background technique [0002] Iron pentacarbonyl is a compound of iron and carbon monoxide. Many catalysts used in industry are very sensitive to carbonyl compounds. A few parts per million of carbonyl compounds can cause catalyst poisoning and deactivation, which not only shortens the service life of the catalyst, but also causes Some side reactions affect the long-term operation of the device to a large extent. In the carbonylation of CO and methanol, iron pentacarbonyl not only has a direct impact on the catalyst, but also leads to an increase in the iron content of the system, and in severe cases, leads to unqualified product quality. Because iron pentacarbonyl is a highly toxic substance, it is harmful to the human body even at a low concentration, and it is flammable and explosive. At present, there is no standard for the de...

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Problems solved by technology

[0002] Iron pentacarbonyl is a compound of iron and carbon monoxide. Many catalysts used in industry are very sensitive to carbonyl compounds. A few parts per million of carbonyl compounds can cause catalyst poisoning and deactivation, which not only shortens the service life of the catalyst, but also causes Some side reactions affect the long-term operation of the device to a large extent

Low-temperature gas chromatography combined with inductively coupled plasma mass spectrometry and Fourier transform infrared spectrophotometry for the determination of iron pentacarbonyl iron pentacarbonyl is expensive and unaffordable for general laboratories, which is not conducive to the promotion and use of the method

The colorimetric method introduced in "Determination of Hazardous Substances in the Air" has low sensitivity

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