Purity Testing of Carbon Dioxide

To derive the pure carbon dioxide from a carbon dioxide plant, there are different methods used.

Wittemann Stripping Column
This is one of the most popular method used in CO₂ testing. There is improvement in both product purity and yield with the continuous removal of non-condensable impurities from liquefied CO₂. The Witteman Stripping CO₂ Gas Purity Tester is an absorption bottle specially designed to remove confusing cocks, hose connections, awkward manipulation and the usual caustic spillage, making gas testing simple, fool-proof, clean and highly accurate.

The process
CO₂ is liquefied in the same manner as in CO₂ condensers. Instead of the storage tanks, the impure liquefied CO₂ is fed to a new Wittemann stripping column. While impure Liquid CO₂ flows down, pure vapor CO₂ flows up. It strips the non-condensables from the liquid. A significant amount of this now highly impure stripping vapor CO₂ is re-condensed but in another, a new Wittemann CO₂ reflux condenser, which returned to the stripping column. The non-condensables are purged to atmosphere through a control valve manifold assembly continuously. From a reboiler mounted at the stripping column sump, the pure vapor is derived. Our reboilers make use of existing waste heat from hot refrigerant gas instead of generating extra heat with expensive electric power. PLC control of the reboiler output leads to an efficient system operation. Depending on existing building constraints, the pure liquid CO₂ either simply flows to the storage tanks by gravity or is pumped using efficient vane-axial positive displacement pumps fixed on a new Wittemann liquid CO₂ pump package.