Friday, 19 May 2017

Molecular Sieve 3A for drying various objects

Understanding Molecular Sieve

Molecular Sieves are one of the most commonly used desiccants for removing moisture from storage and packaging facilities. When we talk about molecular sieve, what comes to mind are Silica Gel balls/beads having uniform-sized pores. Silica Gel are one of the most well-known form of Molecular Sieves. Others include Activated Carbon and Activated Alumina. The uniqueness of Molecular Sieve desiccant is that it has all same-sized holes, which allow only molecules of the same size as the pores to pass through. The bigger molecules will not pass through as their size is different from the pore size of the molecular sieve. In this manner, molecular sieves absorb all the moisture present in packaging. 

The main use of molecular sieves is in chromatography, the process by which different components of any given mixture are separated for further analysis. In the chromatography process, the given mixture moves through a bed of porous semi-solid substance, (the molecular sieve) where the separation process takes place. As the mixture moves forward, the components with more molecular weight are absorbed first by the molecular sieve. The lesser weighing molecules are always absorbed later. This is how in chromatography, the high absorption powers of molecular sieves are successfully put to use. 

Molecular Sieves are divided into various categories, depending on their usage. These include 3A, 4A, 5A, 10A, 13X among others. In this article, we will get to know more about Molecular Sieve 3A.

Molecular Sieve 3A- An Introduction

Molecular Sieve 3A gets its name on the basis of its pore size. This type of molecular sieve has pores the size of 3 Angstrom ( the measurement used for the pore size of molecular sieves) and will allow only the passage of water molecules with lesser size. So when it is placed along side packed items, Molecular Sieve 3A will absorb all the vapour molecules and not allow dirt and other molecules with pore size more than 3A to pass through. Molecular Sieve 3A desiccant suppliers are witnessing high demand for this desiccant, given its high absorption capabilities. 

MolecularSieve is generally an alkali metal alumino silicate, having the potassium form of type A crystal structure. The pore size of 3 Angstrom is generated when some of the sodium ions from the 4 Angstrom sieve get replaced by potassium ions. Manufacturers of Molecular Sieve 3A advocate more use of this desiccant as it has regular high adsorption rate, high contamination resistance, greater crushing strength and more cyclic times in comparison to other desiccants. Molecular Sieve 3A is also successful in increasing the shelf life of many packed items like food products and pharmaceutical items because of the above mentioned benefits. 

3A molecular sieve suppliers across the country like Sorbead India advise potential clients to buy molecular sieve 3A from well-known companies so as to get the only best possible Molecular Sieve 3A. It is very important that only the best quality Molecular Sieve 3A be used to absorb all moisture molecules from the surroundings.

Saturday, 4 March 2017

Molecular Sieve Pellets/Beads for Effective Solvent Drying




Molecular Sieve- A Brief Introduction

Molecular Sieves, like Silica Gel, are well-known desiccants used mainly for removing vapour molecules from oil, liquid and natural gas streams. Available in balls, beads and pellet form, these desiccants are nowadays more preferred to Silica Gel and Activated Alumina because they can absorb humidity molecules in a better manner. Molecular Sieves are also economically viable as they can take in more moisture molecules in lesser period of time and this helps in saving money.

Molecular Sieves are much in demand due to their uniform pore crystalline structure. This added with their large surface area speeds up the absorption process to a large extent. Molecular Sieves work by using the size exclusion principle. When water molecules come in contact with the Molecular Sieve, only those molecules which fit into the pores are absorbed while the larger molecules pass through. The pore size of Molecular Sieves are in the range of 3,4,5 and 10 Angstroms. When the absorption process is going on depending on the pore size, the water molecules will be absorbed or move forward. This is one of the biggest benefits of using Molecular Sieves as desiccants for removing water vapour.

The main difference while using Molecular Sieve and other desiccants like Silica Gel and Activated Alumina is that in Molecular Sieves, the absorbed molecules get trapped while in the others, the absorbed molecules are free to move away. This is why when Molecular Sieves are used, the water molecules are retained in the pores, freeing the remaining area of moisture. 

Molecular Sieves pellets are widely used in drying oil and liquid gas streams and solvent drying because this desiccant can hold 22% of its own weight in water. Molecular Sieve beads also witness much demand because their absorption qualities are much superior to other desiccants. These qualities include adsorption possible based on molecular size, molecular affinity for the sieve crystal surface and finally the shape of the molecule.

Molecular Sieve Beads/Pellets in Solvent Drying

Among all the Molecular Sieves beads in use, the Molecular Sieve type 3A is generally used to dry dehydration solvents for electron microscopy. The solvents, which are generally made free from moisture molecules are the most commonly used ones like acetone, ethanol, and methanol. They are generally used in electron microscopy embedding work using epoxy resins, so it becomes very important that they have no traces of moisture in them. This is where the role of Moisture Sieve Beads and Pellets become crucial as they will remove all the traces of humidity from the solvents. What better way of solvent drying that Moisture Sieve beads and pellets.

When the bottles containing the solvents are opened, there are chances that they will pick up moisture from the surroundings so that is why Molecular Sieves are used to dry up the solvents. These dried solvents are used in the final stages of dehydration and embedding. The solvent and the water will be quickly adsorbed onto the molecular sieve surfaces as the small pores can only access the smaller water molecules.





Tuesday, 14 February 2017

Molecular Sieve 13X for Effective Humidity Control

Molecular Sieves - An Introduction

Molecular Sieves are one of the most commonly found desiccants. With their evenly-sized pores, they can absorb moisture/impurity molecules, which are of the same size. Due to the even size, larger molecules will not be absorbed while the same sized small molecules can easily make their way through.

While Molecular Sieves have many different uses, they are mainly utilized in the column chromatography process. Here the Molecular Sieves act as a stationary phase, attracting the different components of the mixture, which has to be separated. When the chromatography process begins, the components having the highest molecular weight will leave the Molecular Sieve bed first. This happens because the heavier molecules are unable to pass through the molecular pores. It is only after the larger molecules move that the smaller molecules will move forward. Molecular Sieves also find use as desiccants.


Molecular Sieve 13X in Moisture Controlling

There are various grades of Molecular Sieves available in the market. These include Molecular Sieve 3A, 4A, 5A and 13X among others. While all these grades of Molecular Sieves are useful for different purposes, Molecular Sieve 13X is mainly used for the effective control of moisture in packaging, oil and gas and other sectors. The Molecular Sieve 13X is known to have a pore size opening equal to that of the 10A grade. This makes it handy in while removing moisture from liquid and gas refinements as it helps in the effective absorption for bi-molecule and tri-molecules.

There are many other reasons as well why Molecular Sieve 13X is used across industries. Molecular Sieve 13X can effectively co-adsorb CO2 and H2O, H2O and H2S. Molecular Sieve 13X also finds use as a desiccant for medical and compressor uses. This type of desiccant is also used as a catalyze carrier in industries.

Other than effective moisture control, Molecular Sieve 13X is also widely used in the air refining process by removing carbon dioxide and water. It is employed in the Oxygen PSA (Pressure Swing Adsorption) process. One can also effectively use Molecular Sieve 13X desiccant for the successful removal of grease and solvents from different substances.This is one of the most popular uses of Molecular Sieve 13X Other uses include removal of mercaptans and hydrogen sulphide from natural gas using patented Zeochem technology and effective removal of mercaptans and hydrogen sulphide from hydrocarbon liquids.


All these uses prove the high efficiency of Molecular Sieve 13X in not only moisture control but other areas as well