The author has been engaged in the VOCs governance industry for more than 20 years, and recently came up with the idea that our VOCs governance will be the way out in the future. Direction in**? Because there is a direction, there is a direction for research and development of the most cutting-edge treatment technology. The current treatment technologies are nothing more than RTO incineration technology, CO catalytic cracking technology, adsorption technology, adsorption and desorption combination technology, absorption technology, and biochemical technology. There has been a period of photo-oxygen catalysis technology on the market, the product came out of the author thinks it is a fake technology, if photo-oxygen can solve the problem, the pollution source only needs to install a few lamps to solve the problem, this will be the Nobel Prize in physics technology. The biochemical technology is not very practical and the efficiency of dealing with VOCs is extremely low. RTO and CO technology is a good process route for the treatment of VOCs, but the biggest defect is that it is a big problem to deal with large air volume, such as more than 100,000 to hundreds of thousands of air volume in the spraying industry, which is not able to deal with RTO and CO, so there is a combination of adsorption and desorption technology, from the beginning of granular activated carbon adsorption - steam desorption analysis technology, to honeycomb carbon adsorption - catalytic desorption technology, in the current zeolite adsorption --- RTO CO desorption technology. However, each of these technologies has its own advantages and disadvantages. From the existing adsorption technology, the core is the adsorption material, the best adsorption material that can be found from the perspective of materials science is the activated carbon adsorption material, but why the activated carbon has been gradually replaced by zeolite adsorption in recent years, mainly because of the desorption process, because the activated carbon desorption is easy to ignite, which is its fatal injury, and secondly, the activated carbon desorption is easy to fail after n times, and the life cycle time is short, and the above two defects cause the main reason for the poor use of activated carbon in recent years. However, the traditional process of granular activated carbon adsorption (steam desorption) has not been eliminated for a long time, mainly in a large number of chemical industries, and its unique vapor desorption is manifested in safety and thoroughness of desorption. But why is steam desorption not used in the coating industry or other industries, because steam desorption will produce a large amount ---of wastewater. In recent years, activated carbon adsorption has been heated and desorption by dry method, but the defects of this process are that the desorption is not complete, and the desorption energy consumption is too large.
Is there a material or process, first: the purification efficiency and adsorption efficiency reach the performance of activated carbon, and the second: the desorption safety and life cycle reach the same zeolite. Third: the thoroughness of desorption achieves the efficiency of vapor desorption. Fourth: the cost of desorption is lower, and the power of the device is lower.
Starting from carbon emissions: On 22 September 2020, the President delivered an important speech at the General Debate of the 75th Session of the United Nations General Assembly, stating that China will increase its nationally determined contributions, adopt stronger policies and measures, and strive to peak carbon dioxide emissions before 2030 and achieve carbon neutrality before 2060. The annual carbon dioxide emissions due to RTO, CO and other incineration technologies must be very large, so the use of incineration technology route has been reduced, and in recent years in western developed countries has begun, they have begun to use adsorption and solvent ** technology. Because the use of adsorption VOCs and solvent technology is an effective measure to reduce carbon emissions, it is an effective way for our country to achieve carbon neutrality and carbon peak in the future. In view of the above, the author personally believes that the direction of the VOCs treatment industry is to find better adsorption materials, and secondly, a safer and lower operating cost desorption process.
Combined with the above, the future road of VOCs must be a combination of adsorption and solvent ** process. The above views are only personal views for the reference of people in the industry!