Production process technology of liquid sulfur trioxide plant
2020-03-10
liquid sulfur trioxideMainly used for the preparation of high concentrations of fuming sulfuric acid and chlorosulfonic acid. At present, our domestic sulfur trioxide is basically used in the manufacture of sodium alkylbenzene sulfonate, sulfonated lubricating oil is also manufactured from oil and biopharmaceutical and so on. It is conceivable that the use of liquid sulfur trioxide will continue to expand, and there will be great market prospects. Now this article will explain the production process technology of liquid sulfur trioxide device.
liquid sulfur trioxideThe production process technology of the device is the contact method. Sulfur dioxide is normally produced by the combustion of sulfur or the calcination of pyrite ore (a sulfur-containing iron ore), which is first purified by electrostatic precipitation. The purified sulfur dioxide is below 400 to 600 Shezhidu. Vanadium pentoxide containing potassium oxide or potassium sulfate (promoter) on supported diatomite is used as a catalyst to oxidize sulfur dioxide into sulfur trioxide with oxygen. Platinum can also act as a catalyst for this reaction, but it is more expensive and more prone to catalyst poisoning (leading to failure) than the mixture.
In the laboratory, sulfur trioxide is generally prepared by two steps of high temperature decomposition of sodium bisulfate, one is dehydration and the other is thermal decomposition. Other metal bisulfates are also applicable in this method. The key lies in the stability of the intermediate medium pyrosulfate.
made in this way.liquid sulfur trioxideThe device is basically converted into sulfuric acid, but it cannot be absorbed with water, otherwise a large amount of acid mist will be formed. However, if 98.3% sulfuric acid is used as an absorbent, the absorption efficiency will be relatively high due to the low total vapor pressure of water, sulfur trioxide and sulfuric acid on the liquid surface.
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