Abstract: Apparatus for removing an acidic component from a gas comprising two absorption columns for washing a crude gas by using two concentrations of alkali-containing aqueous solutions. The alkali-containing solution used in the first step has a pH of 6-13 and the solution used in the second step has a 0.3-2.5 N concentration. A specific gravity control device is used to control the concentration of the solution circulated for the second step. A pH control device is used to control the pH of the solution circulated for the first step. The pH control device controls a valve which regulates the addition of the second step solution into the tank of the first step solution as needed.

Abstract: A detachable holder for containers such as vacuum bottles, ordinary bottles, and cans being composed of:a first pair of bent arms having respective ends connected to each other via a hinge;a second pair of bent arms having respective ends connected to each other via a hinge;two handle-levers for connecting free ends of the first pair of arms with those of the second pair of arms; and,a fixing member engageable with the above handle-levers; wherein fixing handle-levers for clamping the container by the holder and detachment of the holder from the container may be easily achieved by sliding the above fixing member on the above handle-levers.