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Anonymous users2024-02-151.Liquid feedstocks include liquefied petroleum gas, condensate, and a variety of distillates from distillation or various secondary processes. In petrochemical production, distillate oil is generally divided into two categories: light oil and heavy oil.
The former includes naphtha, plucking oil, residual oil and atmospheric gas oil (including kerosene, light diesel oil), etc., and the latter mainly refers to vacuum gas oil (including heavy diesel oil, vacuum diesel, etc.). The above-mentioned petroleum fractions can be used as pyrolysis raw materials, among which naphtha (straight-run gasoline) is a high-quality pyrolysis raw material, and its cracking technology is mature, which is the main pyrolysis raw material for petrochemical enterprises in Western Europe and Japan. According to the statistics of the early 80s, the proportion (mass) of naphtha in the cracking raw materials was 80 in Western Europe, 90 in Japan, and 60 in the world.
Due to the different properties of the naphtha, the naphtha yield ( ) varies greatly, the low one only accounts for 2 3 of the **, and the high one can reach 30 40. The naphtha yield in China** is about 5 15. In order to expand the pyrolysis raw material, atmospheric gas oil and even vacuum gas oil have been used as cracking raw materials, and by the early 80s, diesel fractions accounted for about 10 of the pyrolysis raw materials.
As the oil fraction becomes heavier, the aromatic hydrocarbon and sulfur content increases, the hydrogen content decreases, the ethylene yield decreases, the cracking performance deteriorates, and the cracking technology becomes more complicated. In order to improve the quality of heavy raw oil, hydrocracking, hydrodesulfurization and other processes can be used for pretreatment.
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Anonymous users2024-02-14It's been so many days, it seems that LZ is very disappointed, forget it, or close it, evaluate the first few of them.
1st Floor: Lots but Not Truths 100% of them are one-sided materials pulled from the Internet.
2nd floor: I really appreciate the 2nd floor.
3rd Floor: Don't use your brain (pretreatment is divided into physical methods and chemical methods, including all methods of removing impurities, as well as various purification processes), if you need to react, the cost is too expensive, beautiful but not practical.
I hope that the following friends can make specific additions, or more comprehensively, I know so much, lz can also refer to various literature, or go to the Chinese Internet to find electronic literature.
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Anonymous users2024-02-13Is the upstairs here to fool and still rank 23 Spit.
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Anonymous users2024-02-12Hello, the purpose of raw material pretreatment in the chemical process is to make the initial raw materials reach the state and specifications required by the reaction for the smooth progress of the reaction. Chemical reaction is the core of the chemical production process, and the purpose of raw material pretreatment is to achieve the conditions required for chemical reaction. For example:
Solid raw materials need to be crushed and screened to remove some impurities.
1 Pinyin 2 English references.
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I just learn to make paper, you don't need any testing, the chemicals used in papermaking, basically no toxicity, otherwise it is low toxicity, so there is basically no big danger, but some additives are not neutral, there is a certain corrosiveness, it is recommended to contact less, and try not to contact **, eyes, oral mucosa, once in contact can be rinsed with water, serious to seek medical attention. If it must be touched, it is recommended to wet a towel with a weak acid and alkali opposite to the acidity and alkalinity, and then perform the relevant operation. Regarding testing, South China can choose South China University of Technology, the Yangtze River Delta can choose Nanlin, Shandong can choose Shandong Light Industry, Beijing-Tianjin-Tang can choose Beilin, Northeast can choose Donglin, Northwest can choose Shaanxi Science and Technology, other colleges and universities have Jiangnan University, Wuhan University, etc., as well as light institutes in various regions, but testing is not recommended, because the toxicity of these things is quite low. >>>More
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It is difficult to eliminate chemical raw materials when they enter the human body, and the accumulation of these toxic substances will cause some parts of the body or internal organs to be damaged to a certain extent. Less contact.
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