Improved gas chromatographic measurement method for naphthalene content in coal tar

Abstract

The invention discloses a method for quickly measuring the naphthalene content in coal tar. In the method, toluene is selected as a solvent, poly(ethylene glycol succinate) is selected as fixing solution, an acid washed 201red support is adopted, the ratio of the fixing solution to the acid washed 201 red support is 0.07, and a chromatographic column is 2 meters long. The method comprises the following steps: dissolving 0.7 gram of poly(ethylene glycol succinate) in chloroform, adding the acid washed 201 red support and uniformly coating the poly(ethylene glycol succinate) on the acid washed 201 red support; and drying in the air, pumping the solution into the stainless steel chromatographic column by using a vacuum pump, mounting the chromatographic column chromatographic instrument, introducing a carrier gas at a small flow rate, aging for more than 8 hours under the condition that the temperature of a column box is 180 DEG C till a base line is stable, and keeping the aged product for later use. The instrument test conditions are as follows: the column temperature is 120 DEG C; the hydrogen flame temperature is 220 DEG C; the gasification temperature is 220 DEG C; the hydrogen pressure (column pressure) is 0.06MPA; the air pressure is 0.20MPa; the sensitivity is low; and the attenuation degree is 1. A qualitative method and a quantitative method are selected by: drawing a standard curve by using an internal standard curve method; and processing a test sample and working out a result. In the invention, the steps are simple, the operation is simple and a large number of samples can be analyzed in a short time period.

Description

technical field [0001] The invention belongs to a method for determining the naphthalene content of coal tar, and relates to an improved gas chromatography determination method for the naphthalene content of coal tar. Background technique [0002] For a long time, iron and steel plants have been using the national standard YB / T5078-2001 "Gas Chromatographic Determination of Naphthalene Content in Coal Tar" as a daily detection method for naphthalene content in coal tar. This method is usually the most frequently used inspection item in the production and processing of tar in iron and steel plants. Although the accuracy is high, the sample (extraction three times) is cumbersome and takes a long time (1 hour). Alkanes seriously pollute the working environment and damage the health of employees. The analysis time is long, and it takes 40 minutes to inject a sample twice; especially when a large number of samples need to be analyzed in a short period of time, the existing determ...

AI Technical Summary

Problems solved by technology

This method is usually the most frequently used inspection item in the production and processing of tar in iron and steel plants. Although the accuracy is high, the sample (extraction three times) is cumbersome and takes a long time (1 hour). Alkanes seriously pollute the working environment and damage the health of employees. The analysis time is long, and it takes 40 minutes to inject a sample twice; especially when a large number of samples need to be analyzed in a short period of time, the existing determination methods cannot meet the needs of steel plant production.