Process design for the treatment of dilute hydrochloric acid – we hope everyone will participate actively

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This post was last edited by sunjl1981 on 2013-1-6 at 23:33. I am responsible for the process design of a system for the purification and recovery of hydrogen chloride from dilute hydrochloric acid, and I found many useful materials on Haichuan, especially the flowcharts uploaded by edc1233. However, some key parameters are still uncertain at present, and we hope everyone will actively share their opinions: Design parameters: 1. Input data – Flow rate of dilute hydrochloric acid: 8.58 m3/hr; Concentration of hydrochloric acid: 18% (w/w); Temperature: 30 degrees Celsius. 2. Output data – Purity of HCl: >99.99%; Pressure: 3 bar. This is a dilute acid recovered from the flue gases emitted by a hazardous waste incinerator. Due to its low concentration, considering the use of CaCl2 for extraction distillation, but there are still the following issues that we would like to discuss with everyone: 1. What should be the mole fraction of CaCl2 in the dilute hydrochloric acid entering the distillation tower? 2. What is the theoretical yield of HCl? What is the lowest concentration of HCl in the bottom liquid? 3. What is the operating endpoint for the evaporation and concentration process of CaCl2? (50%~60%, according to literature?) 4. Since there is no reflux in this distillation process, can the feed inlet be considered as the first theoretical plate? # ， ， &