Method of manufacturing polymerization grade propylene-equivalent
I. INTRODUCTION
Propylene is an important chemical raw material, widely used in polymer production, fine chemicals and other fields. In chemical production, polymerization grade propylene is a high-quality propylene with high purity, which is suitable for the production of high-performance polymers. However, in the actual production process, due to a variety of reasons, often produces some of the external products, that is, does not meet the quality requirements of polymerization grade propylene propylene. These products can not be directly used in the production of polymers, and need to be treated to meet the quality requirements. In this paper, we will introduce a polymerization grade propylene-equivalent products manufacturing method, aimed at converting these products into qualified polymerization grade propylene.
II. Manufacturing method
1. Refining
Equivalent extraneous products of propylene contain more impurities, such as moisture, sulfur compounds, hydrocarbons, and so on. Therefore, it is first necessary to refine the equivalent extracellular propylene to remove the impurities in it. Commonly used refining methods include drying, desulfurization, and hydrocarbon removal. Specific methods can be selected according to the type and content of impurities.
2. Oxidation
The refined propylene needs to be oxidized to improve its purity. The oxidation reaction can oxidize the carbon-carbon double bonds in propylene to carboxyl or aldehyde groups, thus converting it into compounds that can be easily removed. Commonly used oxidizing agents include hydrogen peroxide and oxygen.
3. Stripping
After oxidation, stripping is required to remove the compounds generated by oxidation. Commonly used removal methods include distillation, adsorption, etc. Among them, distillation can separate the compounds generated by oxidation from propylene, while adsorption can adsorb them on adsorbents.
4. Purification
Propylene after the removal process still contains some impurities and needs to be purified. Commonly used purification methods include distillation and adsorption. Through repeated purification, polymerization grade propylene with higher purity can be obtained.
III. Precautions
1. Control of reaction conditions
During the manufacturing process, the reaction conditions, such as temperature, pressure, reaction time, etc., need to be strictly controlled. To ensure that the reaction is carried out completely and not excessive, to avoid the generation of unnecessary by-products.
2. Selection of suitable oxidizer and stripper
Different oxidizers and strippers have different effects on the purity and yield of propylene. Therefore, when selecting oxidizing agent and removing agent, it is necessary to make preferential selection according to the actual situation in order to obtain the best manufacturing effect.
3. Strengthening equipment maintenance and operation management
The manufacturing process requires the use of a variety of equipment and pipelines, and it is necessary to strengthen equipment maintenance and operation management to ensure the normal operation of equipment and pipelines, and to avoid leakage, clogging and other problems.
Fourth, conclusion
Through the above manufacturing method, the polymerization grade propylene-equivalent can be converted into qualified polymerization grade propylene, and the utilization rate of resources and economic benefits can be improved. At the same time, it is also necessary to pay attention to such issues as controlling the reaction conditions, selecting suitable oxidizers and strippers as well as strengthening the maintenance and operation management of the equipment in order to ensure the smoothness of the manufacturing process and the quality of the products.
