Can molecular sieves treat methanol in exhaust gas?

Methanol is a toxic and harmful organic compound that is harmful to the human body and the environment. Methanol may be produced during the production, storage and transportation of petrochemical, pharmaceutical, dye, coating and other industries.

The specific hazards are reflected in the following aspects:

1. Impact on human health:

Methanol can enter the human body through the respiratory tract, skin and digestive tract. Long-term contact or inhalation of methanol vapor can cause damage to the human nervous system, liver and eyes. Mild poisoning manifests as headache, nausea, blurred vision and other symptoms; severe poisoning may cause blindness, coma and even death.

2. Impact on the environment:

Methanol is a flammable substance. If it leaks accidentally or is improperly handled, it may cause accidents such as fire and explosion. In addition, methanol is also a bioaccumulator that may damage the ecological environment through the food chain.

3. Impact on equipment and materials:

Methanol is corrosive to a certain extent. Long-term contact may cause corrosion to equipment and pipelines, affecting the normal operation of the equipment.

4. Treatment cost:

Methanol is a toxic and hazardous substance. Improper treatment and disposal may cause environmental pollution and personal safety accidents. Therefore, it is necessary to invest certain economic costs and technical means to treat waste gas, wastewater and waste residue containing methanol.

To treat methanol in waste gas, it is recommended to use Xintao 4A, 5A, and 13X molecular sieves.

The pore size of the molecular sieve has certain restrictions, so only molecules of a certain size can pass through. The size of methanol molecules is small and can pass through the pore system of the molecular sieve smoothly; and the shape of methanol molecules is relatively regular, which is easy to adapt to the pore structure of the molecular sieve. Therefore, it has a high selectivity and high capacity effect on the adsorption of methanol.

The method of molecular sieve adsorption of methanol mainly involves the following steps:

1. Select a suitable molecular sieve:

Select a suitable type of molecular sieve according to factors such as the concentration of methanol in the waste gas, the processing volume and the operating conditions.

2. Adsorption operation:

Fill the pretreated molecular sieve into the adsorption tower. When the waste gas passes through the adsorption tower, the methanol molecules are adsorbed by the molecular sieve, and the purified gas is discharged from the top of the adsorption tower.

3. Adsorption regeneration:

When the molecular sieve reaches saturation with methanol, it needs to be regenerated to restore the adsorption capacity. The regeneration method usually adopts the heating desorption method, that is, the methanol molecules are desorbed from the surface of the molecular sieve by increasing the temperature. The regenerated molecular sieve can be reused.

4. Waste treatment:

The methanol vapor after desorption can be condensed and recovered, or further treated (such as incineration, catalytic oxidation, etc.) to eliminate the impact of methanol on the environment.

5. Monitoring and maintenance:

During the adsorption process, the concentration of methanol in the exhaust gas and the adsorption effect of the molecular sieve should be monitored regularly to ensure that the expected treatment effect is achieved. At the same time, the molecular sieve should be replaced and maintained regularly to maintain the normal operation of the equipment.

In practical applications, the appropriate molecular sieve model should be selected according to the specific working conditions and treatment requirements, and the safety operating procedures should be strictly followed to ensure personal safety and environmental safety.