3A, 4A, 5A, and 13X molecular sieves are common types of molecular sieves, which differ in structure and use. The following are their main differences and their respective industry applications:

3A molecular sieve

Aperture: about 3 Å (angstroms)

Main component: potassium type A (K-A type) molecular sieve

Use:

Dehydration: suitable for dehydration of small molecular polar substances such as methanol, ethanol, propanol, etc.

Drying: can be used to dry liquids and gases.

Storage: used to store deliquescent substances to prevent moisture absorption.

Industry applications:

Petrochemical

Pharmaceutical

Electronic manufacturing

4A molecular sieve

Aperture: about 4 Å

Main component: sodium type A (Na-A type) molecular sieve

Use:

Adsorption: suitable for adsorption of water, carbon dioxide and certain organic matter.

Dehydration: widely used in the dehydration process of industrial gases and liquids.

Catalyst carrier: used as a catalyst carrier in certain chemical reactions.

Industry applications:

Refrigerant drying

Natural gas drying

Industrial gas purification

5A molecular sieve

Pore size: about 5 Å

Main component: calcium type A type (Ca-A type) molecular sieve

Application:

Adsorption: suitable for adsorption of water, carbon dioxide, ammonia and C3-C4 hydrocarbons.

Gas separation: used for separation of normal alkanes and isoalkanes.

Gas drying: used for drying natural gas, hydrogen and other gases.

Industry applications:

Petroleum refining

Air separation

Chemical production

13X molecular sieve

Pore size: about 10 Å

Main component: sodium type X type (Na-X type) molecular sieve

Application:

Adsorption: suitable for adsorption of water, carbon dioxide, sulfide and larger molecular organic matter.

Gas purification: used for purification and desulfurization of industrial gases.

Catalyst carrier: a carrier used for certain catalytic reactions.

Industry applications:

Air separation

Industrial gas purification

Pharmaceutical and food industries

Each molecular sieve is suitable for different application scenarios and industry needs due to its different pore size and composition. Choosing the right type of molecular sieve can greatly improve production efficiency and product quality.