Vacuum technology for chemical and pharmaceutical processes
Dolphin liquid ring vacuum pump from Busch(firmenpresse) - Selecting the right vacuum technology for chemical and pharmaceutical processing applications is often difficult. Firstly, a vacuum system has to deliver the required pumping speed at operating pressure and thus ensure the required pump-down time. Secondly, it cannot be sensitive to process gases and has to meet all requirements when it comes to CIP (clean-in-place) cleaning and gas recovery. Reliability and economic efficiency also play a significant role when deciding which vacuum technology to use.
Here, we will outline the three vacuum technologies most often used in chemical and pharmaceutical processing technologies.
•Liquid ring vacuum pumps
•Dry screw vacuum pumps
•Oil-lubricated rotary vane vacuum pumps
Liquid ring vacuum pumps
Liquid ring vacuum pumps are used in many applications. They are rotating positive displacement pumps with an impeller that is eccentrically placed in a cylindrical housing. Water is usually used as the operating fluid. The rotation of the impeller creates a liquid ring on the inside of the housing that seals the spaces between the individual blades. The gas is conveyed in the spaces between the centre, the individual blades and the liquid ring. Thanks to the eccentric placement of the impeller, the volume of these spaces increases, thus sucking the medium in through the inlet. As the impeller continues to rotate, the volume of the spaces is reduced, the medium is compressed and then discharged again through the discharge. The liquid ring vacuum pump can be operated as a simple continuous flow system, or as a partial or total recirculation system.
Over many years, these vacuum pumps have proven themselves to be robust and reliable vacuum generators in chemical processes. The operating fluid in the compression chamber continuously dissipates the compression heat, so the vacuum pump operates nearly isothermally. This means that the process gas does not heat up to a notable degree and the vacuum pump operates at relatively low temperatures. This significantly reduces the risk of unwanted reactions or an explosion. Low operating temperatures also facilitate condensation of vapours and gases, which increases the nominal pumping speed of the vacuum pump.
Water is usually used to create the liquid ring. Ethylene glycol, mineral oils or organic solvents are also often used in practice. The ultimate pressure of the vacuum pump depends on the vapour pressure and viscosity of the liquid. The viscosity of the operating fluid will impact the power consumption of the vacuum pump.
Liquid ring vacuum pumps are available on the market in different versions, materials and shaft seals.
Advantages of liquid ring vacuum pumps:
•Not sensitive at all to vapours or liquids entering the system
•The different material versions enable them to be tailored to the process gas
Disadvantages:
•Possible contamination of the operating fluid with condensate from the process gas, which makes it necessary to subsequently treat the operating fluid before its disposal
•High energy consumption
•Ultimate pressure depends on the vapour pressure of the operating fluid
Dry screw vacuum pumps
Dry screw vacuum technology is also very widely used in the chemical and pharmaceutical industries. However, this is relatively new compared to liquid ring technology.
In the 1990s, Busch launched the first dry screw vacuum pump on the market, the COBRA AC. The major difference compared to the liquid ring vacuum pump described above is that screw vacuum pumps do not require operating fluid to compress the process gas. This is why it is called a “dry” screw vacuum pump.
In a screw vacuum pump, two screw-shaped rotors rotate in opposite directions. The pumped medium is trapped between the cylinder and screw chambers, compressed, and transported to the gas outlet. During the compression process the screw rotors do not come into contact with each other or the cylinder. Precise manufacturing and minimal clearance between the moving parts enable this operating principle and, in addition, guarantees a low ultimate pressure of
Unternehmensinformation / Kurzprofil:
Busch Vacuum Pumps and Systems is one of the world’s largest producers of vacuum pumps, vacuum systems, blowers and compressors.
Its extensive product portfolio comprises solutions for vacuum and overpressure applications in all industries, including the chemical, semiconductor, medical technology, plastics, and food sectors. It also covers the design and construction of customized vacuum systems, as well as a global service network.
The Busch group is a family-owned company and is still managed by the Busch family. Busch Vacuum Pumps and Systems has 3,000 employees in more than 60 companies in over 40 countries worldwide. Busch is headquartered in Maulburg, in southwest Germany. This is the location of Busch SE headquarters, as well as the German production facility and German sales company. In addition to Maulburg, Busch also has its own production plants in Switzerland, the UK, Czech Republic, Korea and the USA.
Busch Vacuum Pumps and Systems was founded by Dr.-Ing. Karl Busch and his wife Ayhan Busch in 1963. Dr.-Ing. Karl Busch developed the “Huckepack”, which was the first vacuum pump that could be used for vacuum packaging of foodstuffs. The follow-up product, the compact “R 5” rotary vane vacuum pump, revolutionized food packaging. A further milestone represented the development of the “COBRA” screw vacuum pump. In 1971 the international expansion of the Busch group started with the founding of a sales company in the UK. The first production plant outside Germany was established in the USA in 1979.
Jasmin Markanic
Busch Dienste GmbH
Global Marketing / Marketing Services
Coordinator Global Press & Media Relations
Schauinslandstraße 1
DE 79689 Maulburg
Phone: +49 7622 681 3376
Jasmin.Markanic(at)busch.de
www.buschvacuum.com
Datum: 11.07.2019 - 10:29 Uhr
Sprache: Deutsch
News-ID 595620
Anzahl Zeichen: 4309
contact information:
Contact person: Jasmin Markanic
Town:
Maulburg
Phone: 0049 7622 681 3376
Kategorie:
Manufacturing & Production
Typ of Press Release: Product
type of sending: send
Date of sending: 11.07.2019
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