What are the basics of green petrochemicals in refining?

Refining is the process of reprocessing petroleum. Oil by chemical methods will be about 4 to 12 carbon atoms of the lighter hydrocarbon mixtures “pick” out together, which is commonly used in automobiles fuel - gasoline

Refining is the process of reprocessing petroleum. Oil by chemical methods will be about 4 to 12 carbon atoms of the lighter hydrocarbon mixtures “pick” out together, which is commonly used in automobiles fuel - gasoline; and then heavier carbon atoms for the number of 10-22 hydrocarbon mixtures “pick” out together, which is commonly used in large trucks fuel - diesel; and then other structurally similar substances in different categories “pick” out; and then other structurally similar substances in different categories of “pick” out of the process of oil reprocessing. “out and put together, which is the fuel commonly used in large trucks - diesel fuel; and then other structurally similar substances in different categories “pick” out in different storage tanks, after processing to form other products. Here said pick out, not manual refining, but with a kind of separation device called “distillation”, these devices are common in the refinery those huge towers and metal containers.
Oil through the refinery process, can be refined into gasoline, kerosene, diesel, lubricants, paraffin, petroleum jelly, asphalt, etc., can also be separated out of benzene, toluene, xylene, ethylene, propylene, styrene and other organic chemical raw materials, these chemical raw materials can be processed to produce resins, synthetic rubbers, synthetic fibers, etc., but also to produce plastic bottles, plastic pipes, wires and cables, TV housings, cell phone shells, refrigerator shells, etc. shell, refrigerator shell and so on.
2、What is PX? Is there any toxicity? What is its use?
The appearance of PX is similar to ordinary gasoline. In fact, ordinary gasoline contains about 10% of PX. PX's risk factor is the same level as gasoline, so it can be seen that the toxicity of PX is not great; although direct contact will be irritating to the human eyes and upper respiratory tract, but it is not carcinogenic. PX volatility is strong, the density of water is lower than that of water, and once it enters the body of water, it can be floating on the surface of the water to volatilize. Due to its fast evaporation rate, it can generally be volatilized from river water within 3 to 5 days. PX volatilized into the air can be photolyzed, so PX is not a persistent pollutant in surface water.
Paraxylene (PX) is an important chemical raw material, mainly used in the production of chemical fibers, and is the raw material for synthetic resins, paints, dyes, etc. PX can be processed into a variety of fabrics, film packaging materials, and clothing. PX can be processed into a variety of fabrics, film packaging materials, clothing, etc. Nowadays, almost all the clothes we wear are not pure cotton, most of them are deep-processed products of PX, which is so close to our lives. With the development of the economy, the downstream of the “chemical fiber” on the increasing demand for PX, while the domestic supply capacity of PX is very limited, in 2013, China's self-produced PX can only meet the total domestic demand for half of the rest of the half can only rely on imports from Japan, South Korea, and so on at high prices, resulting in China has lost the right to price for PX, and because of the PX, PX is the most important product in the world. Pricing power, and because the price of PX rose, resulting in “chemical fiber” cost increases, if one day see the price of clothes rose, then this has a lot to do with the lack of supply of PX.