In the falling-film absorber used in the synthesis section to absorb HCL, why does HCL enter from the top?
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This post was last edited by sunjl1981 on 2013-1-6 at 21:58. In our facility, the HCL gas enters the falling film absorber from the top, while the dilute acid flowing out from the bottom of the two-stage falling film absorber moves downward in the same direction. I believe that if the gases come into contact in opposite directions, the average density difference will increase, which should facilitate absorption In your unit’s falling film absorber, does HCL enter from the top or the bottom? The reasons I consider for contacting me downstream are: (1) whether it is easy to disperse the film if done upstream, and (2) whether it is to extend the contact time. Does anyone who is an expert know? Please give some advice. # ， ， &
There are two forms of absorption for hydrochloric acid: isothermal absorption and adiabatic absorption. 1. In the synthesis process, primary and secondary falling film absorption as well as tertiary packed-bed absorption are generally used, achieving an overall absorption efficiency of over 99% ； 2. In primary and secondary falling film absorption, the liquid enters tangentially to form a liquid film that comes into contact with hydrogen chloride gas ； 3. Hydrogen chloride gas is absorbed when it comes into contact with the liquid film; once a certain concentration of absorption is reached, this liquid film can no longer absorb hydrogen chloride, and it is replaced by a new liquid film, thereby producing qualified hydrochloric acid ； 4. Reverse absorption will result in: the destruction of the liquid film; the heat generated by hydrochloric acid absorption leads to poor heat removal, thereby preventing isothermal absorption ； 5. In packed-bed absorption, the process is reverse, as it is an adiabatic absorption; therefore, the absorption efficiency for a single pass generally does not reach 99%. This post was last edited by yzhms on 2008-1-20 17:31]
Everyone, please help me. I’ve just started working in this field... Does anyone know about the Mannheim method?
I don’t know about the Mannheim method; as for from the top, that’s meant to increase contact with water!
If you enter from below, the gas will hold it in place – how can there be any change in quality then!
Then why does the gas enter the scrubber from below and exit from above? o
Film-down adsorption is a form of parallel adsorption, with the material concentration also distributed vertically; counter-current absorption is essentially a form of air lift.
Boss, do you have any relevant materials? L :L Could you get some of them for me? I’m really eager to know; please help me out
See this site: http://bbs.hcbbs.com/redirect.php?goto=findpost&pid=1068463&ptid=234122
Thank you, big bro. But is there any detailed technical information available?