I have a question regarding the continuous feeding of slurry raw materials
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This problem has been bothering me for a long time. I want to carry out a continuous esterification reaction, first in the laboratory; if it works, then scale it up for industrial production later. The raw materials are pentaerythritol, benzenesulfonic acid, toluene, and low-molecular-weight fatty acids; since it is a dehydration reaction, a CSTR is used for the reactor. The problem is that pentaerythritol and benzene sulfonic acid (the catalyst) cannot dissolve in the solvent toluene, and since it is a dehydration reaction, water has a significant negative impact on the reaction outcome. So how can a stable solid continuous feeding method be implemented? Should the slurry be fed together or separately? The reaction conditions are currently at atmospheric pressure and at 140 degrees. It is hoped that this can be implemented in the laboratory first; tube pumps and roller pumps both failed, and pentaerythritol easily clogs the Teflon tubes. Sigh, I’m being despised by the Japanese to the extreme; they actually can’t solve the problem themselves and just tell me to think about it. . .
Could LZ please be more specific? What is the solid content of this slurry approximately?
Currently, the mass fraction of pentaerythritol is approximately 9.5%, the mass fraction of benzene sulfonic acid is 3%, the solvent toluene accounts for about 49%, and the acid used is a thiolic acid (CH3CH(SH)CH2COOH). Pentitol and benzenesulfonic acid are solids that cannot dissolve in the solvents and acids used later. These problems did not occur during batch reactions, but when trying to use a CSTR for continuous processing, it is difficult to feed the materials properly, and the Teflon tubes get clogged as well. 2# wang_wanghai19
Hydraulic conveying can be considered.
Could you explain it in more detail? Can it be delivered stably at a constant mass ratio? Of course, the price shouldn’t be too high. For now, it’s being tested in the laboratory first, 4# mfjxg