Development of an in-line evaporation unit for the production of gas mixtures containing hydrogen peroxide – numerical modeling and experimental results

Sterilization of Objects, Products, and Packaging Surfaces and Their Characterization in Different Fields of Industry: The Status in 2020

“…In sterilization processes, where H 2 O 2 solution is mixed with another gas, the pressure in the figure depicts the partial pressure of the H 2 O 2 –H 2 O vapor. The diagram is generated from vapor pressure equations of a H 2 O 2 –H 2 O binary mixture as explained in the study by Jildeh et al [ 183 ]…”

“…To estimate the evaporation dynamics of the H 2 O 2 solution, weighted vapor–liquid equilibrium (VLE) diagrams derived from vapor‐pressure formulation of the binary H 2 O 2 –H 2 O system are used. [ 183 ] These diagrams can also be used to predict the condensation dynamics of the H 2 O 2 –H 2 O gas mixture. The weight factor for the VLE diagram is the molar ratio of air in the gas mixture.…”

“…Based on the surface temperature of the fluid channels inside the gas generator, some of the H 2 O 2 ‐stabilizing agents are deposited on internal surfaces of the evaporation unit. [ 183,196 ] These deposits will impede the heat‐transfer process and lead to a depletion of stabilizers in the H 2 O 2 gas. This might cause the decomposition of H 2 O 2 and a decrease in the present H 2 O 2 concentration that reaches the target.…”

“…[ 184 ] For further details on the vapor‐pressure formulation and VLE diagrams, we refer to various studies. [ 183,185,186 ]…”

“…[184] For further details on the vapor-pressure formulation and VLE diagrams, we refer to various studies. [183,185,186] To control the condensation behavior of H 2 O 2 , the outlet temperature of the gas out of the H 2 O 2 gas generator is regulated. If condensation is unfavorable, a gas temperature may be set to 300 C. Above this temperature, the stability of H 2 O 2 decreases and autothermal decomposition becomes prominent at 400 C. [187,188] H 2 O 2 generators are heat exchangers that transfer thermal energy from an ohmic or inductive heating source to evaporate or vaporize H 2 O 2 solution or its aerosol and maintain the generated gas at a set temperature.…”