In the application in the petrochemical field, what are the advantages of 13X molecular sieve compared to other molecular sieves?

In Terms of Pore Size and Adsorption Selectivity

• Appropriate Pore Size: The pore size of 13X molecular sieve is about 10 Å, which enables it to effectively adsorb various substances with different molecular sizes commonly encountered in the petrochemical process. In contrast, for example, the 5A molecular sieve has a pore size of 5 Å and can only adsorb molecules with a critical diameter less than 5 Å, showing weaker adsorption ability for some larger molecules. The larger pore size of 13X molecular sieve allows larger molecules such as aromatics and naphthenes to enter the pores and be adsorbed, demonstrating unique advantages in processes like aromatic separation.
• High Selective Adsorption: It has a good selective adsorption capacity for different molecules and can screen them according to their size and shape. For example, in a gas mixture, it can preferentially adsorb polar molecules and unsaturated molecules, and has a relatively high adsorption selectivity for acidic gases such as carbon dioxide and hydrogen sulfide. It can more effectively remove these impurities from petrochemical gases. Compared with some molecular sieves with poor selectivity, it can better meet the strict purity requirements of petrochemical products.

In Terms of Adsorption Capacity and Kinetic Performance

• Large Adsorption Capacity: 13X molecular sieve has a large specific surface area and abundant pore volume, enabling it to accommodate more adsorbate molecules and possess a high adsorption capacity. In processes such as gas drying and desulfurization and decarbonization, it can adsorb a large amount of water and acidic gases. For example, compared with 4A molecular sieve, under the same conditions, 13X molecular sieve has a higher adsorption capacity for water and can more thoroughly remove the water in petrochemical feed gases, reducing various problems caused by water.
• Fast Adsorption Kinetics: It has good adsorption kinetic performance and a fast adsorption speed. In the actual petrochemical production process, it can reach adsorption equilibrium within a short time, improving production efficiency. For example, in a continuous gas purification process, 13X molecular sieve can quickly adsorb the impurities in the gas, allowing the gas to reach a high degree of purification within a short residence time, adapting to large-scale and high-efficiency production requirements.

In Terms of Stability and Regeneration Performance

• Good Thermal Stability: 13X molecular sieve has good thermal stability and can maintain the stability of its crystal structure and adsorption performance at relatively high temperatures. In some high-temperature process steps in the petrochemical industry, such as the gas purification links in catalytic cracking and reforming units, it can work normally in a high-temperature environment without experiencing problems such as structural collapse or performance degradation like some other molecular sieves, ensuring the reliability and continuity of the adsorption process.
• Strong Chemical Stability: It has a relatively strong tolerance to common acids, bases, and organic solvents in the petrochemical process and is not easily corroded or damaged by chemical substances. This makes it maintain good adsorption performance in various complex chemical environments and can be applied to many different petrochemical processes, with a wider range of applications.
• Easy to Regenerate: After saturation, 13X molecular sieve can be relatively easily regenerated by simple methods such as heating and depressurization to restore its adsorption capacity. Compared with some molecular sieves with harsh regeneration conditions and low regeneration efficiency, the regeneration cost of 13X molecular sieve is lower, which can reduce the operating cost of petrochemical production and improve the economy of production.