[Chemical Knowledge]：Polymer-grade propylene-properties, uses, upstream and downstream raw materials, storage methods, polymer-grade propylene standards.

Polymerization grade propylene definition and properties

Polymerization grade propylene (Polymer-grade propylene) is a high purity propylene used in the production of various polymers. Its purity usually reaches more than 99.5%, and other products refer to those propylene that do not meet this purity standard. Other foreign products may contain more impurities, such as propane, butane, etc. These impurities will affect the effect of its downstream applications, but in some specific applications, such as propylene still has commercial value.

The main use of foreign products such as propylene

Despite the low purity of propylene and other foreign products, it still plays a role in many applications. It can be used to produce some chemical products that do not require high purity of propylene, such as some rubber and coatings. External product propylene is often used as a fuel or a component in a mixture for industrial combustion equipment. In some cases, it is also used as a feedstock in crackers to produce other chemicals.

Upstream raw materials and production process

The upstream raw materials of polymer grade propylene and other foreign products mainly include oil and natural gas. Production processes typically involve petroleum cracking, natural gas separation, and propylene purification from olefin plants. In the cracking process, heavy hydrocarbons are cracked at high temperatures into lighter hydrocarbons, including ethylene and propylene. Subsequently, the propylene is extracted and further purified to the desired grade by means of fractionation columns and adsorptive separation techniques.

Downstream Products and Applications

Polymeric propylene is the key raw material for the production of polypropylene (PP), which is widely used in the manufacture of plastic products, fibers, packaging materials, etc. Propylene is also an important basic chemical for the production of acrylic acid, acrylonitrile and their derivatives, which have important applications in the coatings, textile, construction and automotive industries. For external propylene, although not suitable for the production of high purity products, but can be used as an alternative raw material in chemical processes requiring lower purity propylene.

Storage and transportation methods

Propylene is a gaseous hydrocarbon that is often stored and transported in the liquid state. Due to its low boiling point (-47.7°C), it needs to be liquefied by pressurization or cooling techniques. External products such as propylene are usually stored in high-pressure steel cylinders or special storage tanks. The storage tanks should have good sealing and pressure resistance, and be equipped with safety valves to prevent overpressure. During transportation, it is necessary to follow the relevant dangerous goods transportation regulations to ensure safety.

Market and Economic Impact

The market price of polymer-grade propylene and other foreign-grade propylene is affected by a variety of factors, including crude oil prices, supply and demand, production costs and environmental regulations. The price of propylene is usually lower, which has become the choice of some enterprises to reduce production costs. The propylene market is also affected by fluctuations in demand from the macro economy and downstream industries. In recent years, with the improvement of environmental protection requirements, propylene production enterprises need to strengthen the treatment and utilization of foreign products propylene to reduce environmental pollution.

Environmental and safety issues

As a flammable gas, special attention should be paid to the safety during the production, storage and transportation of propylene. External products such as propylene may have higher safety risks due to impurities. Production enterprises should strictly abide by the safety operation procedures, be equipped with necessary safety protection equipment, and regularly carry out risk assessment and emergency drills. Leakage and improper handling of propylene may cause environmental pollution, so effective environmental protection measures need to be taken to ensure the compliance of exhaust gas and waste liquid discharge.

future development trend

With the continuous development of the chemical industry, the demand for high-purity propylene will continue to increase. The use of external products such as propylene has also gradually received attention. In the future, with the technological progress and cost reduction, the purification technology of propylene is expected to be improved, so that it can be applied in more fields. The development trend of green chemical industry will promote enterprises to pay more attention to environmental protection and safety issues in the production and use of propylene.

Conclusion

Polymeric grade propylene and other foreign products have an important position in modern chemical industry. Although the purity of propylene is low, it can still play a role in many fields through reasonable application and treatment. Upstream raw materials, production processes, storage and transportation and market dynamics all have an impact on the supply and demand of propylene. In the future, with the improvement of technological progress and environmental protection requirements, the treatment and utilization of propylene and other foreign products will be more efficient and environmentally friendly, providing new opportunities for the development of the chemical industry.