What is the appropriate preheating temperature for the pre-distillation tower?
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Recently, I was working on the design of a distillation process package. The design institute specified that the steam-liquid mixture feeding into the pre-distillation tower should be preheated to 114 degrees. Is such a high temperature really necessary? I previously understood it to be around 70 degrees, and that the steam condensate can be preheated to 114°C? And where does this steam condensate come from? I would appreciate it if experienced sea travelers could help answer this question. Also, please share the parameters of a few towers. Thank you! (No one replied in the discussion thread, so it was moved here)
Different devices and different feed components all affect the design of the feed position; however, generally, the feed is supplied at the corresponding bubble point temperature. It shouldn’t be as high as you mentioned – most of the time it’s around 65 degrees. In actual operation, various factors cause the temperature to be only close to the designed value; in some cases it can drop to 50 degrees, while the highest temperature I’ve seen was probably around 70 degrees. But you can ask the design institute that provided you with the data again to see if there are any special requirements
In distillation, reboilers are generally powered by low-pressure steam or medium-pressure steam as the heat source; the steam condensate is presumably used on-site, right where it is produced in the reboiler
I suspect you might have misread it; in a typical three-column distillation process, steam condensate is used to heat the material at the bottom of the pre-column, which serves as the feed to the pressure column, to around 115 degrees. The crude methanol feed to the pre-column is generally heated using purified methanol. For the parameters of the tower, you can check this post in the methanol database: http://bbs.hcbbs.com/thread-119338-1-1.html
1. This heat source comes from the pressurized tower. 2. They might have made a mistake; it could be the temperature of the condensate. 3. The feed temperature at the pre-tower bubble point cannot be that high either
Thank you. Could you share the methanol process package? I really can’t believe that design institute. I later found many more mistakes, and when I asked them, they couldn’t explain why
I work in the field of distillation equipment. Almost none of the design firms I’ve worked with are capable of carrying out a complete distillation design; and even if they do, they generally lack practical experience to back it up! It is best to have a professional distillation manufacturer design the distillation process! You can contact me; I’ll give you the phone number of a professional technician! My phone number is: 15753506807
Preheating temperatures cannot be generalized; it depends mainly on the process and the materials used!