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Vacuum degassing. A technique for removing dissolved gas from a liquid or paste. By lowering the pressure in a container with the mass.
Every substance changes according to temperature and pressure. Mixtures of substances can therefore be separated when one substance evaporates at another point than the other. Under vacuum, evaporation is possible at lower temperatures. This technique can be used in degassing processes. To remove dissolved gases from liquids, especially water or aqueous solutions.
According to Henry's law, the amount of dissolved gas in a liquid is proportional to its partial pressure. So, placing a solution under reduced pressure makes the dissolved gas less soluble. Sonication and stirring under reduced pressure can usually enhance process efficiency. This technique is often referred to as vacuum degasification or simply degassing.
Vacuum degassing systems are often a combination of a vacuum pump and a trap. The vacuum pump reduces the pressure inside the system. The trap protects the vacuum pump by preventing liquids and particles from reaching it. In the cases of heavy condensable loads, a condenser can be used to collect the valuable compounds. It can be installed upstream or downstream of the vacuum pump, according to the respective process requirements.
Vacuum is used in degassing installations like extruders, columns, or mixers. Vacuum degassing plays an important role in different applications such as:
Under vacuum, the evaporation of the gas can take place at a low temperature. This offers several advantages:
An important prerequisite when choosing the right vacuum pump for degassing is that it reaches the expected pressure range for the process step. Moreover, the vacuum pump should be able to handle liquids and small particles.
Typical vacuum pumps for vacuum degassing are liquid ring vacuum pumps, claw vacuum pumps and dry screw vacuum pumps.
Liquid ring vacuum pumps are the perfect choice for vacuum degassing as the vacuum pump often comes in contact with condensable vapors. The condensation of such vapors in the liquid ring is very efficient. Dry screw vacuum pumps are perfectly suited whenever the vapors can be valorized if not contaminated. Oil-lubricated rotary vane vacuum pumps are excellent when accumulation can be avoided in the oil.
Busch solutions are used in all kinds of degassing applications. DOPHIN vacuum pumps, for example, play an important role in processes like sea water deaeration on offshore platforms or sparkling water degassing. Dry screw vacuum pumps are used in pharma and in the cosmetic industry to degas creams and pastes. Our vacuum technology is also present in plastics degassing in compounding processes, and in water degassing for recycling processes and food applications. Another possible field of application is the degassing of solvents in the chemical industry to avoid adverse side reactions. But also degassing of steel and metal to produce a purer grade.
You should consider the following in order to find the vacuum degassing solution that best fits your needs:
When it comes to reliability, maintenance effort and economic efficiency, we made the right choice opting for the PLASTEX degassing system.
