The difference between 3a, 4a, 5a molecular sieves
The difference between 3a, 4a, and 5a molecular sieves is mainly due to the different uses, such as the difference in bulk density and compressive strength. Many people who do not understand will think that the difference between these different molecular sieves is in diameter. In fact, this is wrong. Let’s compare the differences and similarities of these three molecular sieves. 3A molecular sieve The bulk density is 680Kg/m³, and the compressive strength (N)≧80/P. Mainly used in the drying of petroleum cracking gas, olefin, gas training field, oil field equipment, and industrial dryer for chemical industry, medicine, hollow spirit, etc. 4A molecular sieve The bulk density is 680Kg/m³, and the compressive strength (N)≧80/P. Mainly used for the drying of natural gas and various chemical gases and liquids, refrigerants, medicines, electronic materials, and abnormal substances. 5A molecular sieve , The bulk density is 680Kg/m³, the compressive strength (N)≧80/P. Mainly used for natural gas drying, desulfurization, carbon dioxide removal, nitrogen and hydrogen separation, production of oxygen, nitrogen and hydrogen, petroleum dewaxing, etc. Molecular sieve has 3A/4A/5A/10X/13X and other models, each model has diameters of 0.4-0.8mm, 1-2mm, 1.6-2.5mm, 2-4mm, 3-5mm and 4-6mm. Molecular sieve.
Introduction of molecular sieve material
In the context of carbon neutrality, molecular sieves, a new material for adsorption and catalysis, have gradually attracted attention. A few days ago, at the 7th Molecular Sieve Technology and Application Summit Forum of Jianlong Micronano, more than 200 guests including China Gas Industry Association and heads of well-known domestic gas equipment companies gathered to discuss the application of molecular sieves in the energy, chemical industry and environmental fields. Molecular sieve adsorbents screen the carbon dioxide, nitrogen and other components in the air through physical adsorption, so as to achieve the purpose of purifying the target gas. Because molecular sieve has the advantages of high adsorption capacity, strong selectivity, and high temperature resistance, it has been widely used in many fields such as petrochemical industry, coal chemical industry, air separation and purification, environmental management and so on. At present, there are four major paths for feasible carbon neutral technologies, namely, energy transition, carbon capture and utilization, low-carbon life, and plant carbon sink. Liu Yingshu, director of the Institute of Gas Separation Engineering, University of Science and Technology Beijing and director of the Group Standards Committee of the China Gas Association, introduced at the forum that the above-mentioned technical paths can be found in the application of molecular sieves. In terms of carbon capture and utilization, molecular sieve adsorbents and catalysts are used to collect and store carbon dioxide, so as to achieve industrial carbon emission reduction and utilization; in terms of plant transformation, zeolite water-retaining agents and repair agents are used to fix water for soil moisturizing and repair, so as to achieve deserts. Fixed water afforestation, saline-alkali land restoration, etc. Data shows that steel plants across the country need a total of 130,000 tons of molecular sieve for oxygen production each year. In addition, in the field of hydrogen production, molecular sieves can not only be used for the recovery and purification of hydrogen in various industrial hydrogen-containing tail gas, but also help to reduce environmental pollution caused by tail gas emissions or direct combustion of tail gas. In addition to the above fields, molecular sieves also play an important role in the utilization of nuclear energy. According to Liu Zhihui, director of the Nuclear and Radiation Safety Center of the Ministry of Ecology and Environment of China, as an inorganic ion exchanger, molecular sieves have the advantages of high radiation resistance, mechanical, thermal and ionization stability. Molecular sieves were used in the treatment of radioactive waste water in the nuclear accident at the Fukushima nuclear power plant in Japan, and good results have been achieved. It is predicted that with the continuous growth of the oil and gas industry in emerging economies, the compound annual growth rate of the global molecular sieve market from 2020 to 2025 will be 5.65%, and it will reach 4.39 billion US dollars in 2025. On this subdivision track, there are already some listed companies with considerable strength. Molecular Sieve Material
Features of portable nitrogen generator
There is cryogenic nitrogen production, which uses low temperature to turn all the air into a liquid state, and then uses the different boiling points of different components of the gas to separate in the process of heating. The characteristics are: relatively large scale, relatively high purity, and large area. Long start-up time; Nitrogen production at room temperature is the use of adsorbents to separate oxygen and nitrogen in the air. The characteristic is that it requires a certain pressure, which occupies a small area, has a fast start-up speed, is small in scale, and has relatively low purity. Portable Nitrogen Generator
Method of remove hydrogen sulfide
Including iron hydroxide method, activated carbon method, Claus method and zinc oxide method. ① Iron hydroxide: Mix iron chips and wet wood chips thoroughly, add 0.5% calcium oxide to make a desulfurizer, with a humidity of 30-40%. The hydrogen sulfide reacts with the desulfurizer to be removed, and the regenerated iron hydroxide can be used continuously. The response is as follows: 2Fe(OH)3 3H2S─→Fe2S3 6H2O 2Fe2S3 6H2O 3O2─→4Fe(OH)3 6S This method has high desulfurization efficiency and is suitable for purifying gases with low hydrogen sulfide content. However, the equipment occupies a large area. Replacement by wet method, or combined with wet method for deep desulfurization. ②Activated carbon method: Activated carbon is used to absorb hydrogen sulfide, and oxygen is converted into monomer sulfur and water. The sulfur is washed away with amine sulfide, and the activated carbon can be used continuously. This method is not suitable for gas containing tar. ③ Claus process: Firstly, 1/3 of the hydrogen sulfide is converted into sulfur dioxide, and then it is reacted with the remaining hydrogen sulfide in the reformer to directly produce high-quality molten sulfur from the gas phase. ④Zinc oxide method: Granular zinc oxide reacts with hydrogen sulfide to produce zinc sulfide and water. Mainly used to purify waste gas with low hydrogen sulfide content. This method is more efficient, but not economical Remove Hydrogen Sulfide
Features of membrane nitrogen generator
1. Perfect fluent design, optimal use effect; 2. Reasonable internal components, uniform airflow distribution, reducing the impact of high-speed airflow; 3. The unique protection measures of molecular sieve extend the service life of carbon molecular sieve; 4. Simple operation, stable operation, high degree of automation, and can be operated without anyone; 5. Automatic interlocking nitrogen exhaust device to ensure the quality of product nitrogen; 6. Optional nitrogen device flow, automatic purity adjustment system, remote monitoring system, etc.; Ruiyu main products: nitrogen generator, Guangdong nitrogen generator, nitrogen generator, nitrogen generator manufacturer, PSA nitrogen generator, nitrogen generator device, pressure swing adsorption nitrogen generator Membrane Nitrogen Generator
Application of steam activated carbon in organic waste gas
1. Condensation recovery method: The organic waste gas is directly introduced into the condenser through adsorption, absorption, dissolution and separation, and valuable organic matter can be recovered. This method is suitable for the working conditions of high organic waste gas concentration, low temperature, and small air volume, and requires attachment Refrigeration equipment, mainly used in the pharmaceutical and chemical industries, less used by printing companies 2. Absorption method: Generally, physical absorption is used, that is, the exhaust gas is introduced into the absorption liquid for purification. After the absorption liquid is saturated, it is heated, analyzed, and condensed for recovery; this method is suitable for large-scale, low-temperature, and low-concentration exhaust gas, but heating is required Analysis and recovery device, the equipment is large and the investment is relatively high. Generally, the activated carbon adsorption method is adopted: the exhaust gas is adsorbed by activated carbon. When the adsorption is saturated, the activated carbon is desorbed and regenerated. The exhaust gas is blown off and catalytically burned to convert it into harmless substances. The regenerated activated carbon is continued to be used. When the activated carbon is regenerated to a certain number of times, the adsorption capacity is significantly reduced, and the activated carbon needs to be regenerated or updated. Activated carbon is currently the most used method to treat organic waste gas. It has good adsorption performance for benzene waste gas, but has poor adsorption for hydrocarbon waste gas. The main disadvantage is that the operating cost is high and it is not suitable for the environment with high humidity. However, as far as the current market applications are concerned, the use of activated carbon adsorption is the most commonly used. Activated carbon is mostly used: activated carbon particles and activated carbon fibers. The price of activated carbon particles is relatively cheap, but the effect is lower. In comparison, the price of activated carbon fibers is relatively higher and the effect is better.
