Read this K-value off the chart (approximately 21.3).
![k value depriester chart k value depriester chart](http://seblog.strongtie.com/wp-content/uploads/2015/02/Table-A2.1.jpg)
These nomograms have two vertical coordinates, one for pressure, and another for temperature. Select appropriate light and heavy keys, and use the K values for the corresponding key compounds using the chart given in Figure 5.4 at the mean tower conditions.
![k value depriester chart k value depriester chart](https://i.ytimg.com/vi/TDb-AnZu6OY/maxresdefault.jpg)
9113 V 1 Ki 1 F From yi K i x i, we obtain y1. Note that 2 atm 203 kPa.115 F V 1848 kmol/h. Mean tower conditions: 210☏ and 110 psig. K i 1 zi V F 1 Find K i from DePriester Chart: K1.076, V Ki 1 V / F 73, K 2 F V F 4.1 K 3 152 kmol/h, L 0. DePriester in an article in Chemical Engineering Progress in 1953. Vapor/Liquid Equilibrium Previous chapters dealt with pure substances or with constant composition mixtures (air). Given: Column efficiency 75, Reflux correction factor 1.5.
![k value depriester chart k value depriester chart](https://prod-qna-question-images.s3.amazonaws.com/qna-images/question/3d92844e-6ca2-49ef-8715-47175e101383/f60ba88c-0648-4f08-86cf-f95a03d196a7/zdf4qan_processed.png)
DePriester Charts provide an efficient method to find the vapor-liquid equilibrium ratios for different substances at different conditions of pressure and temperature.