Seeking help to solve the problem of reboiler coking during dimethyl carbonate distillation?
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In the image above, 4.74 refers to methanol as the raw material for contract manufacturing, while 4.98 refers to DMC. Our company uses two distillation towers; Tower 1 is primarily used for light component removal, with the azeotrope of methanol and DMC being extracted from its top, while the bottom of Tower 1 contains colored DMC with a purity of over 99.7%. At the top of Tower 2, the DMC product is obtained, while the bottom contains colored reconstituted components. A problem has now arisen: after a period of distillation in Column 2, the heat exchange efficiency of the reboiler decreases significantly, and a viscous substance similar to asphalt forms at the bottom of the column. The processing capacity was reduced from 4 tons per hour to 1 ton, and decomposition occurred. There is suspicion of coking on the surface of the reboiler at the bottom of Tower 2, which is affecting heat exchange efficiency. I need a solution.
Analyze the causes of coking; if it is caused by high temperatures, then use vacuum distillation to reduce the temperature in the reactor.
Vacuum distillation, falling film reboiler, forced circulation. Feel free to contact me if needed; I can provide a solution
What type of reboiler is currently in use? What is the steam pressure? Have you compared it with similar factories?
Options such as negative pressure distillation and falling film reboilers can be considered. It mainly involves thermosensitive substances, with high heating temperatures and a long exposure time to heat. Approach the problem from these two perspectives. Distillation design and equipment manufacturing company; feel free to message me if you need anything