Sulfur and nitrogen analyzer
Sulfur and nitrogen analyzer
The sulfur-nitrogen analyzer is a new generation of precision experimental instruments developed based on the principles of chemiluminescence and ultraviolet fluorescence, or the combination of microcoulomb analysis and computer technology. Sulfur and nitrogen analyzer can be widely used in petroleum, chemical, coal, scientific research institutions and other industries.
The principle of sulfur, nitrogen analyzer
l, set ultraviolet fluorescence analysis, chemiluminescence analysis in one
Oxidation reactions occur when the sample is introduced into a pyrolysis furnace. At a high temperature of 1000 degrees Celsius, the sample is completely vaporized and undergoes oxidative cleavage. Nitrides in the sample were quantitatively converted to •NO, and sulfides were quantitatively converted to S02. The reaction product is carried by the carrier gas and is dehydrated by the dryer to enter the reaction chamber. • NO reacts with the O3 gas from the ozone generator in the reaction chamber and is converted into excited state N02'. When the excited state N02' transitions to the ground state, photons are emitted, and the emitted light signal is detected by a photomultiplier tube at a specific wavelength. The intensity is proportional to the total nitrogen content in the original sample, so that the chemiluminescence can be measured. The light intensity determines the total nitrogen content in the sample. S02 is converted into an excited state of S02' under the irradiation of a specific wavelength of ultraviolet light. A photon is emitted when the excited state of S02' is transitioned to the ground state. The emitted light signal is detected by a photomultiplier tube at a specific wavelength, and its intensity is
It is proportional to the total sulfur content in the original sample, so the total sulfur content in the sample can be determined by measuring the intensity of the fluorescence emission.
2, using microcoulomb analysis
Total Sulfur Measurement: The sample is mixed with oxygen and burned in a pyrolysis tube. Sulfur in the sample is converted to sulfur dioxide quantitatively and carried by the carrier gas into the titration cell. I3- reacts with the cell causing the concentration of I3- to decrease, indicating the reference electrode. The change in I3- concentration is indicated, and the signal is output to the amplifier. A corresponding voltage is output from the amplifier to the pair of electrolysis electrodes. An oxidation reaction takes place at the anode to supplement the I3- consumed by the sulfur dioxide. The I3- concentration in the titration cell was restored. By measuring the amount of electricity consumed by the I3, according to Faraday’s law of electrolysis, the total sulfur content in the sample can be determined.
Measuring total nitrogen: The sample is injected into the cracking tube and passed through a high-temperature nickel catalyst layer in the presence of excess hydrogen to perform hydrocracking. The nitrogen in the sample is converted to ammonia quantitatively. The ammonia enters the titration cell and the hydrogen in the cell with the carrier gas. Ion reaction occurs, so that the concentration of hydrogen ions in the titration cell changes, indicating that the potential between the electrode pairs also changes, and this change signal is sent to the micro Coulomb amplifier. The amplifier outputs a voltage to the pair of electrolysis electrodes. An oxidation reaction takes place at the anode. The electrolysis produces H+ to replenish the H+ consumed by the reaction. When the electrolysis cell H+ recovers, the electrolysis stops automatically and the electricity consumed by the electrolysis produces H+. The total nitrogen content in the sample can be determined according to Faraday's law of electrolysis.
The significance of sulfur and nitrogen analysis
In the petrochemical production process, sulfur is one of the major hazards that cause metal equipment corrosion, catalyst poisoning, and engine wear. The SO2 emitted by gas engines and boilers is the main source of polluted air causing excessive sulfur in the atmosphere. On the other hand, controlling certain sulfur content or adding certain sulfides in petroleum can also improve the properties of oil products and increase the quality of oil products. The nitride is the main cause of darkening of the oil, generation of a large amount of sediment, and poor storage stability.
China’s energy structure has always been dominated by coal, and the chemical composition of coal and the influence of coal quality and coal combustion on the environment are closely related. There are dozens of elements in coal, but there are five major elements: carbon, hydrogen, oxygen, nitrogen, and sulfur. Most of the sulfur in the combustion of coal is oxidized into sulfur dioxide and emitted with the flue gas, polluting the atmosphere, jeopardizing animal and plant growth and human health. At the same time, the nitrogen in coal is oxidized to nitrogen oxides and can directly invade the human respiratory tract to induce asthma. After the concentration of nitrogen oxides and volatile organic compounds (VOCs) in the atmosphere reaches a certain concentration, a series of complex photochemical reactions under sunlight can generate “photochemical smog” containing ozone, aldehydes, and nitrate compounds. Nitrogen oxides can also form sulfuric acid formed with nitric acid and SO2 in the atmosphere to aggravate the environmental hazards of acid rain. With the increasing awareness of environmental protection in the entire society and the spread of environmental scientific knowledge, more and more people are concerned about how to avoid the environmental impact of coal combustion.

Determination of sulfur and nitrogen content is of great importance for industrial production and environmental protection. Therefore, the analysis of the total sulfur and total nitrogen content in the sample has always been valued by people.
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