Purification technology plays a crucial role in the fields of modern industry and scientific research. Whether it is air purification, water treatment or gas separation, purifiers have become indispensable equipment in many industries due to their efficient ability to remove impurities. This article will systematically explain the working principle of the purifier and combine actual data to illustrate its application effect in different fields to help readers better understand this technology.
What is a purifier?
A purifier refers to a type of equipment that can separate target substances or remove impurities from the mixture. It is widely used in chemical, pharmaceutical, electronics, food and beverage industries. Depending on the treatment object, purifiers can be divided into liquid purifiers and gas purifiers. This article will take the gas purifier as an example to deeply analyze its working principle and practical application.
How the gas purifier works
Gas purifiers mainly remove impurities in the gas through physical adsorption, chemical reactions or membrane separation. Here are a few common working principles:
1. Physical adsorption:
Purification is achieved by using adsorbents (such as activated carbon, molecular sieve) to selective adsorption of specific components in the gas. For example, molecular sieves can effectively adsorb moisture and carbon dioxide in the air, allowing nitrogen and oxygen to pass through. Studies have shown that under 25℃, the adsorption of water by type 4A molecular sieve can reach about 20% of its own weight.
2. Chemical reaction:
The catalyst promotes chemical conversion of impurities, thereby achieving removal. For example, in the preparation of high purity nitrogen, copper catalysts are often used to convert trace oxygen into water vapor and then removed by a desiccant. This technology reduces oxygen content to ppm (parts one million) level.
3. Membrane separation technology:
Separation is achieved using different permeability rates in membrane materials using different gases. For example, a palladium silver alloy film can selectively allow hydrogen to pass through quickly while blocking other gases. Experimental data show that at an operating temperature of 400°C, the selective transmittance of palladium silver film to hydrogen can reach more than 99.9%.
Practical application and data support
1. Air purification:
In indoor air treatment, HEPA filters can capture more than 99.97% of particulate matter with diameters greater than or equal to 0.3 microns, significantly reducing pollutants such as allergens, bacteria and viruses, and improving air quality.
2. Industrial waste gas treatment:
For industrial waste gases containing volatile organic compounds (VOCs), activated carbon adsorption method shows high removal efficiency. For example, a chemical plant optimizes the adsorption system to reduce the VOCs emission concentration from 500mg/m³ to below 50mg/m³, meeting the environmental protection standards.
3. Semiconductor manufacturing:
Ultra-pure gases are crucial to chip quality. In silicon wafer etching process, if the chlorine gas is insufficient, it may lead to an increase in product defect rate. After using multi-stage purification technology, the impurity content in chlorine can be controlled at ppb (one in one billion) level, ensuring production quality and stability.
The purifier efficiently removes impurities from gas through various methods such as physics and chemical methods, and plays a key role in improving the quality of life and promoting industrial development. Whether it is air purification equipment in daily life or special gas purification equipment in high-tech fields, it all reflects irreplaceable value. With the continuous development of technology, more efficient and economical purification solutions are expected to emerge in the future, further helping the progress of various industries.
