Technology: Gas/Liquid Contact Device Used To Scrub Gases

• Applicable To Aggressive Environment
• High Mass Transfer Rate
• Compact Units With No Mechanical Moving Parts
• Good Resistance To Blockage And Fouling Through
• Elimination Of Packing
• Efficiency Dependent On Liquor Flow Not Gas Flow
• Essentially Maintenance Free

• 21% sodium hydroxide
  
• Chlorine/air mix – maximum of 25,000ppm of chlorine in air
  

• 18,000 tons/year of 14.8% Sodium Hypochlorite Solution

• Capacity: 18,000 tons/year of 14.8% sodium hypochlorite solution
• Commissioned: January 2000
• Shut Down: December 2009
• Technology: Gas/Liquid Contact Device Used To Scrub Gases

Click here to view a brief overview on the technology and process

The chlorine and air mix from the cells passes to the hypochlorite plant at about 150°C and is cooled to about 35°C through the venture system. The gases then pass through the main scrubber and then onto the backing scrubber to be vented to atmosphere. NaOH is pumped through the scrubbers to form sodium hypochlorite. This is recycled from one of the 2 stock tanks until the correct concentration is reached.

There are 2 NaOH pumps (1 in standby) and this pumps the stock tank contents via the plate and frame heat exchangers to the scrubber. The back up scrubber has a similar layout.

There are 4 off GRP bulk storage tanks. One stores NaOH and the other 3 sodium hypochlorite. 

• (1) 218 Kg/Hr AEA Designed V-Tex Gas Scrubber
• (2) Titanium/SS Plate Heat Exchanger With Hastelloy C276 Plates. 10 Barg
• (2) Scrubbers Operating In Series (Main and Backing)
• (2) Batch Tanks To Allow Continuous Batch Chlorination
• (2) On-Line Analyzers Utilized In Process Monitoring And Control
• The sodium hypochlorite plant is controlled by an Allen Bradley PLC with panel view screen. Good graphics and software is available. Installed in 2000