Application of molecular sieves in the petroleum industry

I. Definition

Molecular sieves are very important chemical additives, catalysts and adsorbent materials in the petrochemical industry. The material has the ability to preferentially adsorb polar molecules and saturated molecules. Thus, molecular sieve desiccants with different polarity, saturation, molecular diameter and thermal stability are separated, and they have the sieving effect of separating adsorbed molecules, so they are called molecular sieves.

II. Structural characteristics

First, the basic structural unit is composed of regular tetrahedrons centered on silicon and aluminum atoms. Secondly, many regular tetrahedrons are connected by oxygen bridges to form a ring structure. Chemxin molecular sieve zeolite is a multi-microporous crystal of aluminosilicate with uniform pore size and ultra-large specific surface area. It has the characteristics of good thermal stability, strong adsorption performance and high strength.

III. Application of molecular sieves in the petroleum industry

Molecular sieve adsorbents are widely used in the catalytic process of traditional petrochemicals, the ion exchange process required for the treatment of waste gas and waste liquid in the daily necessities industry, and the radioactive industry of coal mines. The application of molecular sieve zeolite in the field of petrochemicals has been continuously expanded, which has promoted the rapid development of my country's economy. In the petrochemical industry, it is mainly used for oil cracking, ethylene, propylene drying, natural gas drying, carbon dioxide desorption, hydrocracking purification, etc.

According to the function, molecular sieve materials with adsorption capacity are mainly used in the chemical industry and environmental purification and separation industry, as well as desiccant and other fields. Because the physical adsorption of its material can adsorb substances, the internal micropores have strong polarity and Coulomb field, which can adsorb polar molecules and unsaturated molecules.

Granular molecular sieves can be used as adsorbents to remove heavy metal ions in wastewater treatment and treat organic wastewater. Modified molecular sieves can remove compounds in water with good results. In the field of gas separation, molecular sieve adsorbents can be used for pressure swing adsorption to produce nitrogen, carbon dioxide, oxygen, etc.

IV. Other applications:

Chemxin molecular sieves can be divided into 3A, 4A, 5A, 13X, 13X APG, 13XHP and lithium molecular sieves due to different uses. In addition to the petroleum industry, it is also widely used in the drying of air, natural gas, methane gas, air separation devices and adsorption drying devices.