How to choose molecular sieve for acetone solvent dehydration

1. Advantages of molecular sieve

Precise selective adsorption:

Molecular sieve can selectively adsorb water molecules without affecting the existence of acetone molecules.

High adsorption capacity:

Molecular sieve has very high adsorption capacity and can achieve efficient removal of water in a relatively short time. After the molecular sieve is fully activated, its water adsorption capacity is higher than other adsorption materials, and the treated acetone solvent can reach the ppm level of water content.

Long service life:

After the molecular sieve is saturated with adsorption, it can be regenerated by other methods. The service life of high-quality molecular sieve can reach tens of thousands of hours.

2. Model selection of molecular sieve

The diameter of acetone molecule is about 0.6 nanometers. It is recommended to use Chemxin 4A molecular sieve desiccant, which has the highest cost performance.

3. Precautions for the use of molecular sieve

Pretreatment:

When the acetone solution flows through the molecular sieve tank for drying, it needs to be filtered first to ensure that the solution has removed most of the water, suspended matter and impurities to prevent affecting the drying effect of the molecular sieve.

Control temperature:

During both the drying process and the regeneration process, it is necessary to pay attention to controlling the operating temperature. Too high a temperature will affect the adsorption effect, and insufficient temperature will reduce the activation and regeneration effect.

Ensure contact time:

Molecular sieve adsorption and drying is a physical behavior. The acetone solution flowing through the molecular sieve needs to control the appropriate contact time to ensure sufficient contact time.

4. Regeneration method of molecular sieve

After the molecular sieve is saturated with adsorption, its adsorption capacity can be restored by regeneration method.

A common regeneration method is high-temperature gas desorption, that is, high-temperature gas is used to desorb the acetone molecules adsorbed on the molecular sieve, and the molecular sieve is regenerated at the same time. After desorption, the desorbed acetone can be recovered by condensation.