Carbon dioxide absorption soda lime

Neumann MA, LasterMJ,Weiskopf RB,Gong DEI, Dudziak R, Forster El, etal.The elimination of sodium and potassium hydroxides from desiccated soda lime diminishes degradation ofdesflurane to carbon monoxide and sevoflurane to compound A but does not compromise carbon dioxide absorption. Anesth Anaig 1999 89(3) 768-73. 

In physical absorption no chemical reactions take place and the absorbed material (absorbate) is held by the absorbing material (absorbent) only by the forces of cohesion or capillary action in the pores of the solid. Physical absorption is a reversible process. As examples may be cited the absorption of gases such as nitrogen or oxygen in water, and absorption by soda lime or KOH of carbon dioxide... 

A U-tube containing calcium chloride in one limb and soda-lime in the other, to protect the absorption apparatus from the carbon dioxide of the air and from the moisture of the aspirator. 

Properties A liquid. Mw 94.93, mp -66C, bp (explodes). Soluble in alcohol, acetone. Occurrence Thermal decomposition of trichloroethylene closed-circuit anesthesia using trichloroethylene and soda-lime absorption of carbon dioxide. May be synthesized by passing trichloroethylene over alkaline materials at 70F. Hazard Confirmed carcinogen. TLV ceiling 0.1 ppm. 

Air input. 2. Soda lime for absorption of carbon dioxide. 3. Flow-meter. 4. Metabolism cage. 5. Three-way glass stopcock. 6. Liquid scintillation counter. 7. Photomultipliers. 8. Counting vial. 9. Peristaltic pump. 10. Towards barium hydroxide for C02 absorption. 

The air with its CO2 is poured into dehumidifying traps to remove the moisture from the stream in air for an accurate carbon weight balance and then poured into an absorption column of carbon dioxide and an absorption colunrn of water. In these two columns with soda lime (NaOH inunobilized to slaked lime) and soda talc (NaOH inunobilized to talc), the produced CO2 is absorbed by the reactions indicated in Eq. (1) ... 

Later on, another modification was made in which the quantification of CO2 is performed by absorption on soda lime and soda talc, and weight determination. This was published in 2007 as an additional option ISO 14855- 2 Determination of the ultimate aerobic biodegradability of plastic materials under controlled composting conditions — Method by analysis of evolved carbon dioxide Part 2 Gravimetric measurement of carbon dioxide evolved in a laboratory-scale test. 

MODA-apparatus is shown in Fig. 1. The principle of this method is to measure the increasing weight of the absorption colunrn charged with soda lime due to evolved carbon dioxide. 

It consists of 4 reactors (volume 500 ml x 4), 4 absorption columns charged with soda lime, an absorption column to remove carbon dioxide... 

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