device for avlegsnande of co? 712 from a gas mixture

摘要

A carbon-dioxide absorber, particularly intended for extracting carbon dioxide from respiratory gases in respirators, apparatus for administering anaesthetics, breathing apparatus and like apparatus, comprises a container (1), having an inlet (2) and an outlet (3) for the respiratory gas and enclosing an absorbent medium (5) in the form of a fibre structure in which there is absorbed and retained in liquid form a liquid solution of one or more substances capable of chemically binding carbon dioxide. An advantage is afforded when the liquid solution comprises an aqueous solution of one or more hydroxides of alkali metals and/or alkaline earth metals; a particular advantage is afforded when an aqueous sodium hydroxide solution is used. The fibre structure may comprise both fibre material highly capable of absorbing and retaining liquid and fibre material exhibiting but slight liquid-absorbing properties, this latter fibre material being arranged to form a matrix which separates the liquid-absorbing fibre material and ensures that the fibre structure as a whole obtains the desired degree of gas permeability. The liquid-absorbing and liquid-retaining fibre material may comprise, for example, a mixture of rayon and cotton fibres having bound thereto a highly liquid-absorbent cellulose derivative, for example carboxymethyl cellulose.