Gas drying device for micro-coulometry total-chlorine analyzer

Abstract

The invention discloses a gas drying device for a micro-coulometry total-chlorine analyzer. The gas drying device comprises a concentrated sulfuric acid drying cylinder and a magnesium perchlorate drying tube which are serially connected, wherein the concentrated sulfuric acid drying cylinder comprises a cylinder body, a gas inlet pipe and a gas outlet; concentrated sulfuric acid is contained in the cylinder body; the magnesium perchlorate drying tube comprises a tube body, an ingress pipe, an eduction pipe and a tube plug, magnesium perchlorate is contained in the tube body, the lower part of the cylinder body is cylindrical, and the upper part of the cylinder body is spherical. The gas drying device is mainly used for micro-coulometry measurement of total chloride content in petrochemical products, and is capable of effectively removing water in a sample gas by drying the sample gas for two times; the detection sensitivity, accuracy and repeatability of the total chlorine measurement are remarkably improved, and the effective detection of a low-chlorine sample can be realized.

Description

technical field [0001] The invention relates to a gas drying device for a microcoulomb total chlorine analyzer, which belongs to the field of petrochemical analysis instruments and is mainly used for the microcoulometry determination of the total chlorine content in petrochemical products. Background technique [0002] In the production and use of products in the petrochemical industry, the presence of chlorine is the main factor that causes corrosion of production equipment, catalyst poisoning, low qualification rates of raw materials and synthetic chemicals, engine wear, and excessive exhaust emissions. At present, the determination of total chlorine content in petrochemical products at home and abroad mainly adopts the microcoulomb method. This method must first oxidize and burn the sample in a quartz combustion tube heated to 800~1100°C to convert chlorine into gaseous hydrogen chloride. The carrier gas is brought into the electrochemical coulometric cell for detection. ...

AI Technical Summary

Problems solved by technology

When the sample gas flows out of the quartz tube and reaches the electrolytic cell, due to the condensation of water, part of the gaseous hydrogen chloride will dissolve in the condensed water and cannot reach the electrolytic cell for detection, resulting in low test results and poor repeatability of test results

What's more, for low-chlorine samples with a chlorine content of less than 2mg / L, due to the low chlorine content in the sample itself, the hydrogen chloride produced by combustion is very small, and the hydrogen chloride cannot reach the Coulomb electrolytic cell due to the condensation of hydrogen chloride, which directly causes the detection. carried out, thus limiting the detection of samples with low chlorine content

In the prior art, a heating belt is generally wound around the entrance of the electrolytic cell for heating, so as to prevent the moisture generated by combustion from entering the electrolytic cell after condensing at the entrance, which will affect the detection.

However, this heating method has two disadvantages. One is that the temperature of the heating belt can reach 90°C during heating, and it is easy to burn the operator if you are not careful during operation. The other is that sometimes there is still partial condensation, which causes the peak shape during detection. Tailing affects detection accuracy

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