Saturday, 27 January 2018

steel corrosion protection via Molecular sieve desiccant packs.!

 What is corrosion protection?

Corrosion protection is the use of hostile to consumption chemicals to avert harms to gear or office caused by destructive operators. To address the diverse types of erosion in various materials, Cor-Pro Systems offer the accompanying consumption security techniques to our customers.

steel corrosion protection  via Desiccant method

According to DIN 55 473, the purpose of using desiccants is as follows: "desiccant bags are intended to protect the package contents from humidity during transport and storage in order to prevent corrosion, mold growth and the like
The desiccant bags contain desiccants which absorb water vapor, are insoluble in water and are chemically inert, such as silica gel, aluminum silicate, alumina, blue gel, bentonite, molecular sieves etc.. Due to the absorbency of the desiccants, humidity in the atmosphere of the package may be reduced, so eliminating the risk of corrosion. Since absorbency is finite, this method is only possible if the package contents are enclosed in a heat-sealed barrier layer which is impermeable to water vapor. This is known as a climate-controlled or sealed package. If the barrier layer is not impermeable to water vapor, further water vapor may enter from outside such that the desiccant bags are relatively quickly saturated, without the relative humidity in the package being reduced.

"A desiccant unit is the quantity of desiccant which, at equilibrium with air at 23 ± 2°C, adsorbs the following quantities of water vapor:

Calculation of required number of desiccant units

The number of desiccant units required is determined by the volume of the package, the actual and desired relative humidity within the package, the water content of any hygroscopic packaging aids, the nature of the barrier film (water vapor permeability).

Formula for calculating the number of desiccant units in a package (DIN 55 474):

n = (1/a) × (V × b + m × c + A × e × WVP × t)

Friday, 19 May 2017

Molecular Sieve 3A for drying various objects

Understanding Molecular Sieve




Molecular Sieve 3A- An Introduction




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

Tuesday, 27 December 2016

Molecular Sieve Adsorbents for Effective CO2 Removal

What are Molecular Sieve Adsorbents?

When we think of adsorbents, the first thing that comes to mind is Silica Gel. This, however, is not the only adsorbent being used by companies to remove moisture from closed spaces. Molecular Sieve Adsorbents are high-quality desiccants, which are equally effective in maintaining optimum humidity levels. Molecular Sieve Adsorbents are basically crystalline alumino-silicates, commonly known as zeolites.

They are manufactured in such a manner that they have a porous crystalline structure. These pores can re-adsorb water or other polar molecules. With the help of strong ionic forces or electrostatic fields (which are due to the presence of cations such as sodium, calcium and potassium) and with enormous internal surface area of around 1‘000 m2 /g, molecular sieves can take in a large amount of water or other compounds. If the fluid, which is to be adsorbed is a polar compound, it can be adsorbed with high loading, even during very low concentrations of the contaminants. Molecular sieves adsorbents are therefore capable of removing many gas or liquid impurities to very low levels (ppm or less). Another popular positive factor about Molecular Sieve Adsorbents is that they can separate gases or liquids by molecular size or polarity. This is largely made possible by the fact that the pore openings of the Molecular Sieve Adsorbents have the same size as a wide range of products. As the water molecule size is smaller than the Molecular Sieve Adsorbents size, they will be easily absorbed thus maintaining optimum moisture levels.

Molecular Sieve Adsorbents for Carbon Dioxide Adsorption

One may think that Molecular Sieve Adsorbents are only used for water vapour adsorption. That is, however, not the only thing it is used for. Molecular Sieve Adsorbents are utilized for adsorption of other compounds as well. One of them is Carbon Dioxide. Molecular Sieve for CarbonDioxide removal is very common among companies.

For obtaining an adsorbent with typical molecular sieve properties one makes use of thermal processing of granulated carbonaceous material at temperatures of 970-980 degree Celsius. This is usually done in the presence of gases to prevent the oxidation of the carbon material. At temperatures of around −196° C, the adsorption takes place in its micro-pores, whereas nitrogen and argon are taken in at the same temperature at the surface of transitional pores and macro-pores only.

It is mainly oil and natural gas companies, which make use of Molecular Sieve Adsorbents to remove carbon dioxide. It is mainly used to remove CO2 from stream cracked gas, Liquid Petroleum Gas and different atmospheric gases. Mainly, Molecular Sieve 3A and 4A is preferred for the above mentioned purposes.

There are many reasons why Adsorbents 3A and 4A are widely used for carbon dioxide removal. The first being these adsorbents have a high and very rapid adsorption rate. Another factor is that molecular sieve adsorbents are known to have a consistent adsorption speed and have a higher contamination resistance. All these factors make Molecular Sieve adsorbents the ideal substance for removing carbon dioxide from oil and natural gas industries.