Humidity, condensation point, and can achieve ideal vH2O2 concentration
This article is a composed of four articles vaporizing hydrogen peroxide applied theory the first article of the articles in this series, we introduced the vH2O2Application of biological purification process parameters how to affect the cooling and can achieve the hydrogen peroxide vapor concentration.
In this series, we put forward the process parameters of the four basic rules.In affecting the condensation and can achieve ideal vH2O2Before the first parameter to the PPM, we first review the two important values: relative humidity and the relative degree of saturation.
Because the water (H2O) and hydrogen peroxide (H2O2) with similar molecular structure, so the two will affect the air condensation point.However, relative humidity (RH) said only a given temperature water vapour in the air, and the relative saturation moisture and the content of hydrogen peroxide vapour in the air.In containing hydrogen peroxide vapour in the air, condensation will occur before the relative humidity of 100%.Therefore, by relative saturation (RS) measured reliably predict condensation point.
When the relative degree of saturation of 100% RS, mixed vapor will condense.Whenever there vH2O2, relative humidity and relative saturation will be different, and the difference between RH and RS will further be vH2O2The influence of the content.In case of condensation (relative saturation is 100% RS), the vH2O2You can't add the PPM.In fact, the concentration of H2O2 steam usually as part of the vH2O2After condensing into water and oxygen.When this happens, it is necessary to inject more vH2O2To compensate.
If appear at the end of the purification stage dropwise condensation, so in the process of ventilation, the vH2O2PPM readings start may increase, because the droplets will vH2O2The release back into the air.
This led to the first rule: after initial humidity levels, producing H2O2 steam condensation will increase, so you can use more steam.
Described below is that at the beginning of the adjustment phase, the higher the relative humidity (because there is no desiccant), condensation in purification will be faster.Therefore, regulating relative humidity is lower, at the beginning of the condensation occurred before the vH of can achieve2O2The higher the PPM.
In the purification stage, part of the vH2O2Will decompose into water and oxygen.Decomposition of the vH2O2Depends on the amount of material, such as temperature, humidity and airflow conditions, are required to measure specific conditions anticipated actual amount decomposition.In the graphic below, we assume that 10% of the initial amount of the vH2O2Has been decomposition, and more of the H2O2Be vaporized to compensate.
As shown, the adjustment of desiccant will affect to the vH2O2PPM.In figure 1 a and 1 b, the use of hydrogen peroxide solution concentration was 12% - m;Figure 1 c and 1 d use solution concentration was 59% - m.Figure 1 a and 1 b shows two similar in other aspects of biological purification cycle;Orange line said not for dehumidification and the adjusting stage at the beginning of the purification process of relative humidity to 50% RH.Before the blue line shows the adjustment phase has completed the dehumidification process and relative humidity to 10% RH.
Figure 1 a and 1 c shows the desiccant to adjust and maintain moisture percentage of the phase (by the relative humidity and relative saturation).Figure 1 b and 1 d shows the desiccant to adjust and maintain phase can achieve the effect of the maximum hydrogen peroxide vapor concentration.
In this series of the second blog post, we will illustrate H2O2Solution how to affect the produce condensation H2O2Steam.
If you need to read these articles refer to the full white paper, please visit this page:"Condensation problem: effects on hydrogen peroxide vapor biological purification"
