Combustion or recovery of high-volume, low-concentration organic waste gas not only requires very large-scale equipment, but also causes huge operating costs. For this problem, by using a zeolite molecular sieve adsorption and concentration device , organic waste gas with a low concentration and large air volume can be concentrated into a small concentration with a high air volume , thereby reducing equipment investment costs and operating costs, thereby achieving economical and effective organic waste gas treatment.

The zeolite runner organic exhaust gas purification technology is a technology that uses zeolite molecular sieve adsorbent to adsorb and purify VOCs in exhaust gas. Zeolite molecular sieves are crystalline aluminosilicates, which are widely used in the field of exhaust gas treatment due to their regular crystal structure, uniform pore distribution, and adjustable surface properties.

Figure Schematic structure of zeolite molecular sieve

Hydrophobic silicalite adsorbent exhibits strong hydrophobic / lipophilic characteristics, has uniformly-sized pores, large specific surface area (500 ~ 1000㎡ / g), and large adsorption capacity, and can be used to adsorb and remove many organic molecules from exhaust gas. , Is a new type of environmentally friendly material.

On the molecular sieve runner, olefins, organosiloxanes, and macromolecular substances with a boiling point above 260 ° C may cause permanent damage to the runner.

The substances that the runner cannot handle, the substances that are not allowed to enter the runner, and the substances that are restricted from entering the runner are listed below. The list is as follows:  

Table Substances that the runner cannot handle

status	Substance composition	phenomenon
Difficult to adsorb substances	Methanol	Strong polarity does not adsorb
	Cyclohexane	Not easy to adsorb on structure
	Formaldehyde, other low boiling point substances	Low boiling point is not easy to adsorb
Not easily desorbed	Oil mist / tar mist	Not easy to detach
	Plasticizers (DEP, DOP, etc.)	High boiling point is not easy to desorb
	Terpineol	React and accumulate in pores
	Monomer chlorinated vinyl, acrylonitrile, isocyanate, other polymerizable substances	Polymerizable substance
	Monoethanolamine (MEA)	Low steam pressure makes it difficult to desorb
	Other amines	Changing traits is not easy to detach
	High boiling point substances above 200 ° C	Not easy to detach
	Substances with a vapor pressure below 20 Pa (at20 ° C)	Not easy to detach
Molecular sieve degradation	Acid and alkaline substances	Zeolite degradation
	coating	Covering molecular sieve produces degradation

Table of substances that are not allowed to enter the runner

Substances not allowed to enter the runner	the reason	Content control
Dust (calcium carbonate, titanium dioxide, white carbon black, ammonium chloride, iron oxide, etc.)	Clogged holes	<1mg / m3
Paint mist (mist liquid formed by spraying, resin)	Clogged holes	<0.1mg / m3
Polymerization monomers such as acrylic acid, acrylonitrile, butadiene	Adsorbent deactivation	<0.1mg / m3
Active compounds such as isocyanate and silane coupling agent	Adsorbent deactivation	<0.1mg / m3
Boiling point is greater than 220 ° C (diethylene glycol butyl ether, triethanolamine, phthalates, etc.)	Cannot detach	<0.1mg / m3
Melting point is greater than 20 ° C (phenol, naphthalene, tetramethylbenzene, etc.)	Clogged holes	<0.1mg / m3
HCl, Cl2, SO2, H2S, NOx, NH3	Corrosive	PH = 4-10

Table restricted substances entering the runner

Substances restricting access to runners	the reason	Content control
Styrene	Easy to aggregate	<600mg / m3
	Easy to aggregate	<0.1mg / m3
Dichloromethane, pentane, ethanol, cyclohexane	Not easy to adsorb	Designed according to efficiency requirements
Methanol, formaldehyde, acetaldehyde, carbon disulfide	No adsorption	Designed according to efficiency requirements
Boiling point below 40 ° C (alkanes, olefins, halogenated hydrocarbons, etc. below C4)	No adsorption	Designed according to efficiency requirements
Xylene, Xylene, Cyclohexanone and other macromolecules	Some runners do not adsorb	Designed according to efficiency requirements
Boiling point at 170-220 ° C (trimethylbenzene, ethylene glycol butyl ether, propylene glycol, ethylene glycol, decane, NMP, DMSO, DEF, butyrolactone, etc.)	Difficult to detach	Activated carbon filtration or high temperature regeneration