Vacuum degassing removes dissolved gas from liquids by lowering pressure in a vessel. It is used in water treatment, laboratory testing, and soil purification. The process is used to improve purity or solid state strength and can remove sulfur gases from water. It is also used to quickly scrub gases from laboratory test samples and in the agricultural sector to purify soil-water mixtures.
Vacuum degassing is the process of removing dissolved gas from a liquid solution by lowering the pressure inside a vessel containing the solution. The reduced pressure inside the vessel causes the gas to become less soluble and separate from the liquefied material. At the end of the vacuum degassing process, the gas is removed from the vessel and the pressure returns to normal. This process is typically performed in a specially designed chamber known as a vacuum degasser. Vacuum degassing is often used in water treatment, laboratory testing, and soil purification procedures.
Simple vacuum degassing procedures are performed on many types of liquefied substances, including molten steel. Air and other gases are typically removed from a liquid material to improve its purity or solid state strength. During the pressure pull-down process, air and gases in the containing vessel are typically drawn through a siphon and dispersed to the atmosphere. This process is also used to analyze a material under controlled conditions. These conditions can include atmospheric pressure, temperature, humidity and altitude, as well as electromagnetic and microwave radiation.
A form of vacuum degassing is used in water treatment plants to greatly reduce the overall pressure of the gas in a holding vessel. The pressure inside the vessel is usually lowered using a pump or fan. The holding vessel for this process is typically constructed of aluminum, fiberglass, or steel. In some cases, reinforced concrete equipped with metal fittings is used. This degassing method is sometimes employed to remove sulfur gases from water.
This degassing method is often used to quickly scrub gases from laboratory test samples. Vacuum degassing also provides a means to prime or purge test samples at low volumes. Vacuum degassers used in laboratory test facilities work by sending the solution through a membranous tube which will only allow gases to escape from it. A constant vacuum must be maintained during this process and the flow rate adjusted for different types of liquid material.
Another type of vacuum degassing is found in the agricultural sector. In this process, a mixture of water and soil is drawn into a holding vessel by means of a vacuum pump. Centrifugal force is exerted on the holding vessel while the pump maintains a constant vacuum inside. This force disperses the soil-water mixture into tight layers for maximum exposure to the vacuum. During this process, the dissolved gases are separated from the mixture and discharged into the air by a blower. After the material has been purified, it is returned to the environment for reuse.
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