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Understanding Degasification

Degassing, also known as degasification, is the removal of dissolved gases from liquids - especially water or aqueous solutions.

It is important to state here that there are numerous methods to effectively remove gases from liquids. Just as importantly, it is important to know that gases are removed from liquids for various reasons.

There are many reasons why we would want degassing or degasification.

Let’s take a simple example. A chemist in a laboratory may want to remove gases from solvents when the compounds they are working on are possibly air- or oxygen-sensitive, or when bubble formation at solid-liquid interfaces becomes a problem. The formation of gas bubbles when a liquid is being frozen can also be undesirable, necessitating degassing beforehand.

Degassing can also be a crucial step after mixing or specifically after casting, to eliminate residual pores in the slurry. These pores can be introduced during either mixing or the chemical reaction, or they can form as a result of entrapped air during casting.

The four common methods for degassing are as follows:

  1. Helium Sparging.
  2. Ultrasonic Degassing.
  3. Vacuum Degassing.
  4. Refluxing.

Our intention here is to only focus on Vacuum Degassing.

What is Vacuum Degassing?

Vacuum degassing is a technique of removing dissolved gas from a liquid solution by lowering the pressure inside a vessel containing the solution.

Use of vacuum degassing are plenty and the following is a very comprehensive list of just a few applications:

  • Water treatment
  • Steel Manufacturing
  • Hydraulic and Other Oils

To summarize, when a mixture is put into a vacuum degassing chamber and the air pressure above it reduced, i.e. evacuated, the gas bubbles which formed at atmospheric pressure expand and rise to the surface where they burst and the gas released is pumped away.

Although alternate methods can be used to remove or minimize the quantity of gas bubbles, vacuum technology used in degassing applications can improve the quality of products and significantly shorten processing cycles and times.

If you have a vacuum process that you feel can be improved, or cycle times need improvement, please contact us to discuss your application requirements in more detail.

You can call us or send us an email via: https://tmcfluidsystems.com/Contact-Us.html

 

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