There are many different types of carbon mol sieves on the market today. These include beaded molecular sieves, Zeolite 5A, Coal, Coconut shell, and so on. Each of these has its own advantages and disadvantages. It is important to choose the right one based on your specific needs and the type of process you need to run.
Beaded molecular sieves
Beaded carbon molecular sieves are used to remove unwanted contaminants from liquids. They are available in a variety of sizes and can be used for various applications. These materials have pore sizes of 10A or smaller and are ideal for refining processes. They are also suitable for pesticide remediation and the capture of chlorine compounds.
These materials also serve as additives in detergents. By allowing aqueous solutions to pass through their pores, they remove dirt and help to produce demineralized water. Currently, molecular sieves are commonly used in detergents to replace phosphorus and sodium tripolyphosphate. This is because they reduce the environmental impact of detergents. In addition, they are used in toothpaste and soap forming solutions.
In addition to purification, molecular sieves are also used for dehydrating various petrochemical liquids and gases. They are also used in the production of high-purity hydrogen.
Zeolite 5A
Molecular Sieve 5A is a carbon-based adsorbent made from zeolite powder and a binder. It is commonly used for the separation of isomerous and normal alkanes. It is also useful for co-adsorption of carbon dioxide and pressure swing adsorption. This carbon-based adsorbent is available in different shapes, sizes, and qualities. It is generally stored in air-tight containers to prevent moisture adsorption.
The cross-section morphologies of zeolite 5A were examined using a FESEM. This enables us to determine the nanoscale particle size. The results are represented in a histogram of particle sizes. The modal particle sizes range from 86 nm to one mm. The smaller the particle size, the more uniform the size distribution is.
The power output of a carbon molecular sieve is dependent on its temperature and the pressure applied to it. Using a carbon molecular sieve in a low-pressure environment such as 1,000 Pa reduces energy requirements. Carbon molecular sieves work better under high-pressure conditions such as 2,000 Pa.
Coal
A carbon molecule sieve is a filtration device used to separate gases. Its selective adsorption capacity varies depending on the application. It is suitable for the separation of nitrogen and oxygen gases. However, it is limited in the amount of small molecules it can handle. To solve this problem, carbon molecular sieves are manufactured with fine carbon particles.
The material used in carbon molecular sieves is activated carbon. This material is porous and has a nanostructure. The pores of the carbon molecule sieve trap oxygen molecules in compressed air. Nitrogen is not adsorbed and is delivered as product gas. Once the carbon molecule sieve has been saturated with oxygen, it is de-pressurized to atmospheric pressure. Adsorbed oxygen is then discharged into the exhaust.
The carbon materials used in carbon molecular sieves have a bimodal pore distribution. The effective pore diameter is nanoscale. Because of this property, carbon molecule sieves are used in various applications.
Coconut shell
To produce an oxygen selective carbon molecule sieve, coconut shell chars were gasified at temperatures between 650deg C and 900deg C. This treatment increased the adsorption capacity of the carbon molecule sieve and decreased its micropore resistance to gas diffusion. The development of oxygen selective CMS requires multiple steps, including carbonization and gasification. Alternatively, the coconut chars were impregnated with nickel acetate, which significantly increased their capacity and adsorption rates.
Coconut shells are made of a lignocellulosic material consisting of varying proportions of the two major organic components, cellulose and hemicellulose, which are linear polymers of glucose, and lignin, a three-dimensional polymer of aromatic alcohols. The remaining 3% is derived from substances found within the coconut’s cellular structure. Thermal decomposition is accelerated when the temperature reaches 500Adeg C, but does not disrupt the natural cellular structure.
Coconut shell char can be used to produce high capacity CMS for air separation. Its carbon content is approximately 30-50%. In addition to coconut shell charcoal, it can also be converted to coal tar through a process called pelletizing. The process involves heating the coconut shell char in an inert gas at a rate of 2-12degC per minute. The carbon char is held at this temperature for 1-8 hours and then cooled under an inert gas atmosphere. The resulting material has an oxygen capacity of 8 cc/cc.
