Compact & Laboratory scrubber

Designed for gas treatment in laboratories, pilot and production plants in the chemical and pharmaceutical industries.


Amongst others, especially the chemical industry requires complex gas treatment solutions for either production processes or emission control applications. The Compact & Laboratory Gas Scrubbers Series is designed for exactly these purposes. Compact Gas Scrubbers consist of a jet scrubber and, downstream, an absorption column. The jet scrubber operates according to the injection principle and therefore the gas scrubber as such does not cause any pressure loss but generates a pressure increase in the gas flow instead. The circulating scrubbing liquid serves as a motive medium and conveys the induced gas through the jet scrubber pipe. Therefore, when using a compact gas scrubber from GEA no mechanical fan is required for extracting and conveying the gases.

The Compact Scrubbers from GEA are supplied in 6 standard sizes (DN50, DN80, DN100, DN150, DN200 and DN250) and 4 standard configurations (Jet Scrubber, Liquid Tank, Counter-current Column and Circulation Pumps). The modular concept allows easy expansion and adaptation to customer-specific requirements. 

The Laboratory Scrubber is available in a smaller size (DN40). 

Standard materials of construction are polyethylene (PE) or polypropylene (PP), which only differ by their applicable temperature range and their UV stability. PE and PP show already very good chemical stability and are preferred for ambient pressure and low temperature applications. For higher chemical or thermal stability requirements copolymers of e.g. ethylene/tetrafluoroethylene (ETFE) or tetrafluoroethylene perfluoralkoxyvinyl ethers (PFA) or even polytetrafluorethylene (PTFE) lining can be used. Combined with housing of either fiber reinforced plastics (FRP), carbon steel (CS) or various stainless steels (SS) / alloys a very high mechanical, thermal and chemical resistance of the construction can be realized.

They are mainly used for gas treatment in laboratories, pilot and production plants in the chemical and pharmaceutical industries.

Particular features

  • Broad range of applications, flexible in use
  • Self-extracting, no pressure loss
  • Wide load range, efficient partial load behavior
  • Easily combinable and expandable 
  • Available in almost all materials
  • Resistant to fouling
  • High reliability, low maintenance effort
  • Compact design, low space requirement
  • CE conformity according to European Machine Directive (2006/42/EC)
  • Available in ATEX conform design, if required

Performance Curve of the Laboratory Scrubber KGW DN40


Performance Curve of the Compact Scrubbers KGW DN50 – KGW DN250


Technical parameters of the Laboratory Scrubber KGW DN40 and Compact Scrubbers KGW DN50 – KGW DN250

TypeSuction flow in m³/hLiquid content in tank in lGas inlet diameter DN
Laboratory Scrubber KGW DN40max. 2,32040
Compact Scrubbers KGW DN505 - 5010050
Compact Scrubbers KGW DN805 - 15019080
Compact Scrubbers KGW DN10050 - 230400100
Compact Scrubbers KGW DN150100 - 500400150
Compact Scrubbers KGW DN200300 - 10001000200
Compact Scrubbers KGW DN250800 - 15001250250

Working Principle

Working Principle of Compact & Laboratory Gas Scrubbers

A circulating scrubbing liquid serves as a motive medium and conveys the induced gas through the jet scrubber pipe where dust particles are wet, and a chemical reaction starts depending on the scrubbing liquid used.

The gas/droplet mixture is separated in a centrifugal separator which is arranged downstream. The latter is designed in such a way that the formation of foam is largely avoided. The droplets fall into the liquid supply tank from where it is recycled by means of a submergible or centrifugal pump. 

In addition, the gas flows through a counter-flow scrubbing column arranged downstream which is provided with the scrubbing liquid from the circulation pump or with fresh scrubbing liquid if necessary. 

According to requirements, a packed column, a tray column or a structured packing column can be used. Entrained liquid droplets are separated in a demister arranged downstream before the gas outlet. In special cases the jet scrubber can also be equipped with a quench for cooling of hot gas. 

In special operating cases it is also required to separate aerosols. However, these aerosols can neither be effectively separated with a jet scrubber nor with a counter-current column. Therefore, if aerosols occur in the process, GEA can supply a suitable separator as downstream equipment.

The solution or reaction heat which occurs during the scrubbing process can be discharged either through the continuous addition of fresh liquid with the corresponding liquid overflow or through the installation of a cooler in the form of a plate heat exchanger.

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