1. As a more important flow direction after crude oil processing, refined oil is far superior to chemical industry in quantity and scale, which will affect the supply and demand of chemical raw materials in the production process and then change the price of chemical products. This is another path for crude oil to affect chemical industry besides naphtha. In refined oil, gasoline is mainly related to chemical industry. The motor gasoline consumed in the end market is actually a concept of mixture, which consists of gasoline components and additives produced in different processing steps of crude oil, including catalytic cracking gasoline, catalytic reforming gasoline, straight-run gasoline, isomerized gasoline and alkylated gasoline. , MTBE, etc. Generally speaking, the relationship between gasoline and chemical industry is mainly concentrated in two dimensions: first, the demand for oil transfer of chemical raw materials will affect the prices of chemical products in the upstream and downstream of the industrial chain; The other is by-product chemical raw materials, which will affect the supply and price of downstream chemicals.
2. As far as methanol is concerned, there are two ways to participate in oil blending, one is to directly blend gasoline, and the other is to prepare MTBE after reacting with isobutylene. The advantage of * * * is that both of them can provide very high octane number, but the disadvantage is that direct blending oil will cause damage to vehicles because of its high corrosiveness, and MTBE has the risk of polluting groundwater. Therefore, the addition of both of them in gasoline is very limited, especially the direct methanol-to-oil conversion is rarely used. When the price of crude oil changes, MTBE in catalytic reforming gasoline and gasoline pool will drive the demand and price of toluene, xylene and methanol to rise in the same direction, and will be transmitted to styrene, PTA and other varieties through downstream. Pure benzene and PX. Because the demand for toluene, xylene and other aromatic hydrocarbons in the production of chemical raw materials by blending gasoline accounts for the majority, the production integration of styrene and PTA is not very high, and the "crude gasoline toluene/xylene pure benzene /PX styrene /PTA" is relatively stable.
3. Relatively speaking, the proportion of methanol used in oil adjustment is limited, the adjustment elasticity is not high, and the time lag affected by crude oil is too long. In addition to the demand of petroleum blending for chemical raw materials, the production of some gasoline components will also produce chemical by-products. Raw materials. A typical example is the catalytic cracking of gasoline into propylene. Catalytic cracking technology is to convert inferior heavy oil into high-value components such as light gas, gasoline, diesel oil and petroleum coke under the action of catalyst at high temperature. It is one of the main methods of secondary processing of crude oil. FCC gasoline has high octane number and is the main component of domestic gasoline depot, accounting for 60-70%. The by-product light gas is mainly composed of C3 and C4 olefins, propylene and butene. As the main target products of catalytic cracking, the yields of gasoline and propylene can be adjusted by auxiliary means.
4. For example, some units using FDFCC technology can adjust the propylene yield by controlling the reaction temperature, while other FCC units without this function can achieve similar effects by adding propylene additives. Therefore, when the price fluctuation of crude oil causes the value of FCC gasoline to change, the opportunity cost of propylene as a by-product of FCC unit will also change, which will eventually affect the output and price of propylene and polypropylene.