CO2 binding by Baralyme in three different carrier gases

Area of Science:

• Chemical Engineering
• Respiratory Therapy

Background:

• Carbon dioxide (CO2) absorption is critical in closed-circuit breathing systems.
• Baralyme and Sodasorb are common CO2 absorbents.
• Understanding absorbent performance under varying conditions is essential for safety and efficiency.

Purpose of the Study:

• To investigate the absorptive properties of Baralyme and Sodasorb for CO2.
• To determine the impact of inert gas density on CO2 scrubber performance.
• To develop predictive models for scrubber lifetime and absorbent utilization.

Main Methods:

• Experiments were conducted measuring the time (T0.5) for CO2 concentration to reach 0.5% at the outlet.
• Varied parameters included container size, gas flow rate, CO2 concentration, and inert gas type (He, N2, SF6).
• Absorbent consumption up to T0.5 was quantified.

Main Results:

• Scrubber lifetime (T0.5) follows an exponential function of gas transit time (ttr) with an exponent of approximately 1.5.
• The constant 'b' in the predictive equation is influenced by inert gas density and CO2 concentration, but not container size or flow rate.
• Absorbent consumption is highly dependent on CO2 concentration but surprisingly independent of inert gas properties.

Conclusions:

• Developed simple predictive equations for CO2 scrubber lifetime and absorbent reaction.
• Highlighted the significant influence of inert gas density and CO2 concentration on scrubber performance.
• Identified limitations of current mathematical models in predicting scrubber behavior accurately.