Seek advice on the wastewater issues associated with the production of 2-ethylanthraquinone using the phthalic anhydride method
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This post was last edited by Completely soaked on 2015-6-8 06:50. I would like to ask about the production of 2-ethylanthraquinone, which involves acylation reactions, catalyst removal, and sulfuric acid-catalyzed cyclization reactions. I would like to ask about the volume and quality of the wastewater generated in these processes, especially regarding the alkali wash water and washing water after the closed-loop reaction, including the COD concentration and the volume of the wastewater. I would like to learn more about this type of wastewater; please share your insights. I’ll try to get extra points if I can; thank you all first!
There are still people who use this manufacturing process. I worked with it for a while about 6 or 7 years ago, mainly focusing on improving the yield; the yield achieved back then was fairly good. As for treating sulfonation wastewater, it’s extremely difficult. I considered whether it might be possible to purify and recycle the acid, but the costs were too high, so the idea was dropped. This manufacturing process will eventually have to be phased out……
The approach to wastewater recycling is key; if it’s reused in a circular system, is it possible to avoid purification?
Then just do a small test to compare the product quality – that way you’ll know right away!
Given the current high pressure to protect the environment, cost is also very important. The process used by Jihua for producing acetic acid through the oxidation of ethylene used to be extremely efficient; its yield was outstanding, but it still couldn’t compete with the lower costs of the methanol-based method.
Daqing Petrochemical has already closed down; as far as I know, Jilin Petrochemical also has many profitable production units that have been shut down!
The amount of water isn’t very clear; it’s likely not much. Water quality: Deep red in color, pH
What treatment processes do you use for this kind of wastewater?
There are various methods, depending on the properties and parameters of the wastewater.
The wastewater generated by this production process includes: 1) aluminum trichloride wastewater resulting from acylation hydrolysis (catalyst removal), which can be used to produce polyaluminum chloride； 2. For the dilute sulfuric acid wastewater generated after closed-loop hydrolysis, there are various treatment methods available as needed; the key to treatment is the separation of organic substances followed by high-temperature treatment ； 3. The wastewater generated from alkaline and water washing; in actual production, this wastewater is often treated together with the wastewater from acid hydrolysis ；
1. Waste trichloroaluminate used to produce polyaluminum chloride; 2. Waste sulfuric acid used to produce magnesium sulfate; 3. Alkali wash water from wastewater treatment plants