Efficient Removal of VOCs, Providing More Blue Skies in Winter

Since the beginning of winter, almost half of China has been shrouded in smog. Recently, 28 inspection teams from the Ministry of Environmental Protection conducted on-site verification of 469 specific task sites and found that 74 of them had environmental problems, including 15 enterprises that did not meet the standards for air pollution discharge. The main source of these air pollutants is VOCs. Although it cannot directly produce PM2.5, it is an important precursor for the formation of air pollutants. VOCs and nitrogen oxides combine to generate PM2.5 under sunlight, which is called secondary organic particulate matter.

1. The main source of industrial VOCs

Product	Main industries	Proportion
The use of VOC containing products	Equipment manufacturing coating, semiconductor and electronic equipment manufacturing, packaging printing, pharmaceutical and chemical industry, plastic and rubber product production, artificial leather production, artificial board production, papermaking, textile printing and dyeing	53.21%
The process of using VOC as raw material	Paint production, ink production, polymer synthesis, adhesive production, food production, daily necessities production, pharmaceutical and chemical industry, tire manufacturing	20.40%
Production of VOC	Petroleum refining, petrochemical industry, coal chemical industry, organic chemical industry	17.77%
Storage and transportation of organic matter	Storage/transportation/sales of crude oil, refined oil, solvents, production raw materials, and products	8.62%

Table 1 Composition of Industrial VOC Sources

2. The main hazards of VOCs

Types of hazards	Types of VOCs
Damage to nerves	Primary alcohols, ethers, aldehydes, ketones, some esters, benzyl alcohols, etc
Pulmonary poisoning	Hydroxymethyl esters, formate esters
Blood poisoning	Benzene and its derivatives, ethylene glycol
Liver and metabolic toxicity	Halogenated hydrocarbons
Kidney poisoning	Dichloroethane and Ethanol

Table 2: Hazards of VOCs to Human Health

3. Current main governance methods

Method	Characteristic	Shortcoming
Thermal combustion method	Thoroughly oxidize and decompose organic matter	Equipment is prone to corrosion; It needs to be carried out at high temperatures, resulting in high processing costs
Catalytic combustion method	Burning under the action of catalyst	Catalysts are prone to coking and poisoning;
Catalytic combustion method	Even at low temperatures, it can rapidly oxidize	High investment cost
Biological treatment method	Simple equipment and low energy consumption	Cannot recycle valuable substances
Low temperature plasma	Scope of application: Light	High requirements for equipment components and high investment costs;
Low temperature plasma	High purification efficiency	Easy to generate spark discharge, posing a safety hazard.
Activated carbon fiber	Simple process and high investment	The surface is hydrophilic, and the water carried in the exhaust gas and the water generated by the desorption process steam will greatly reduce the adsorption efficiency of activated carbon fibers, gradually deteriorating their adsorption performance and shortening their service life;
Activated carbon fiber	Simple process and high investment	Essentially, it is activated carbon. Compared to granular activated carbon, it has a different appearance, but its pore shape, structure, and adsorption behavior towards exhaust gas are the same as granular activated carbon. However, the manufacturing process is complex and the cost is higher

Table 3 Comparison of Main Governance Methods

Our company has developed a special polymer adsorbent based on the characteristics of VOC gases, which has the advantages of large adsorption capacity, high adsorption accuracy, fast adsorption rate, and high removal rate. After the adsorbent is saturated, the blow off technique can be used to desorb the organic matter adsorbed on the adsorbent and recover the relevant organic matter. After desorption, the adsorbent regains its adsorption capacity, and the regenerated adsorption performance is stable and can operate for a long time.

Innovative Materials Technology/Service Energy Metals/Leading the Resource Cycle

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