Principle and characteristics of microcoulometric chlorine content tester

The microcoulomb chlorine content meter is based on the microcoulomb principle. Various forms of sulfur (chlorine) in the sample are converted into sulfur dioxide (all converted into HCl) in nitrogen and oxygen at high temperature, enter the titration cell, and generate iodine through electrolysis to react with sulfur dioxide (silver ions are generated through electrolysis in the cell to react with chloride ions). The microcomputer automatically calculates the total sulfur content (total chlorine content) in the sample based on the amount of electricity consumed by the generated iodine (the microcomputer calculates the amount of electricity consumed by the generated silver ions) according to Faraday's law. The entire analysis process is controlled by a computer, and the sample is loaded by an automatic sampler. The instrument has a high degree of automation. It can be used for the analysis of trace sulfur or chlorine in petrochemical products, and is widely used in petroleum, chemical, scientific research, teaching, environmental protection, quality inspection, commodity inspection and other industries.

Microcoulometric chlorine content tester features:

Vzui's latest digital coulometer is the most fully configured and widely used sulfur (chlorine) measuring instrument. It is a sulfur (chlorine) measuring instrument with good performance and the highest degree of automation.

vComputer controls, displays the whole process status, parameters, and prints various results.

vSimple operation, reliable performance, good stability, easy installation, the cracking system is air-cooled, and the fan starts and stops automatically.

The microcoulometric chlorine tester uses the principle of Faraday's law. For every 96,500 coulombs of electricity that passes through the electrolytic cell, 1 gram of equivalent substance will be precipitated or dissolved on the electrode. It can be expressed as follows:

W=Q/96500*(M/N)

Where:

W – the amount of precipitated substance, in grams.

N is the number of electrons consumed by each molecule or atom that is deposited or dissolved at the electrode.

M——molecular or atomic weight of the precipitated substance.

Q – The amount of electricity passing through the electrodes during electrolysis.

The sample is carried into the cracking tube by the carrier gas and fully burned with oxygen, and the sulfur or chlorine in it is quantitatively converted into SO2 or HCL. SO2 or HCL is absorbed by the electrolyte and the following reaction occurs:

SO2+H2O+I2 =SO3 +2H++2I- or HCL+Ag+=AgCl↓+H+

The reaction consumes I2 or Ag+ in the electrolyte, causing a change in the potential of the measuring electrode of the electrolytic cell. The microcoulometric chlorine meter detects this change and gives the electrolytic cell an electrolytic voltage. I2 or Ag+ is electrolyzed on the electrode until the I2 or Ag+ in the electrolytic cell returns to its original concentration. The instrument detects the amount of electricity consumed in this electrolysis process, and calculates the amount of I2 or Ag+ consumed by the reaction based on Faraday's law of electrolysis, thereby obtaining the concentration of S or CL in the sample.