Vapour Recovery Unit

* Carbon Vacuum Adsorption

• For the recovery of gasoline and other chemicals. The CVA is the most common solution for gasoline vapour recovery due to the simplicity and very high efficiency.
  The CVA process is generally regarded as the most economical vapour recovery process with respect to capital investment, installation, and operating costs. The process is simple and durable. This result in a reliable operation with a low requirement of maintenance and an energy consumption of less than 0.1 kWh per litre gasoline recovered. In addition the CVA process is extremely efficient. It recovers as standard about 99% and on request up to 99.98% of the hydrocarbons. The CVA can handle the naturally occurring fluctuations in loading rates, due to a buffer effect in the carbon filters.
  
  
• The Carbon Vacuum Adsorption (CVA) unit placed at Slovnaft, Bratislava, Slovakia. The CVA recovers gasoline from rail loading.
  
  
• The Carbon Vacuum Adsorption (CVA) unit placed at Dupont Jet, Turku/Abo, Finland. The CVA recovers gasoline from truck.
  
  
• In the CVA process the gasoline vapours are filtered through active carbon. The hydrocarbons are adsorbed on the carbon, and the purified air is vented from the filter.
  The carbon is regenerated with vacuum. This step generates highly concentrated hydrocarbon vapours which are absorbed back into the original gasoline in an absorber.
  
  
• The CVA is a pressure swing adsorption process, with a two step carbon filter cycle. In the first step the vapours are led up through Carbon Filter 1 while Carbon Filter 2 is regenerated. Step two is opposite step one, the vapours are led up through Carbon Filter 2, while Carbon Filter 1 is regenerated. The vapours remaining from the gasoline absorber are returned and mixed with the inlet vapour to the carbon filters.
  
  
• Sketch of the Cool Sorption Carbon Vacuum Adsorption (CVA) unit.

* COLD LIQUID ABSORPTION

• For the recovery of gasoline, additives, and crude oil vapours.
  
  The CLA is the traditional vapour recovery method and is very safe with a low energy consumption.
  
  
• The patented CLA process is excellent for recovery of gasoline with large amounts of MTBE or other additives and for the recovery of chemicals such as benzene and ketones.
  The CLA process is very safe due to the exclusion of potential ignition sources in the vapour flow. The process can handle the naturally occurring fluctuations in loading rates due to a buffer effect in the absorber liquid.
  
  
• The Cold Liquid Absorption (CLA) unit placed at Preem, Stockholm, Sweden. The CLA recovers gasoline from truck loading.
  
  
• The CLA process consist of two steps. In the first step, the vapours are washed with a cold absorber liquid in an absorber. The purified air is vented from the absorber.
  The absorber liquid is regenerated by distillation in a splitter. In the second step the concentrated vapours from the splitter are washed with gasoline in a reabsorber. The reabsorber recovers the hydrocarbons from the splitter in fresh gasoline.
  
  
• Sketch of the Cool Sorption Cold Liquid
  Absorption (CLA) unit.