Technology for producing glyoxal from ethylene glycol
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This post was last edited by shmily327 on 2011-2-11 09:46. May I ask, experts, what kind of Ag catalyst is used to oxidize ethylene glycol to glyoxal? By searching for patents and literature, I managed to gather some information. The research group led by Professor Xu from Fudan University reported on a method involving coating a copper mesh with a film before plating it with silver; this technique has been put into industrial use by a company in Shanghai. I would like to ask some experts in production technology: what are the operating temperature and inlet temperature for this catalyst when it is used in production? How high is the temperature rise? What is the range of system pressure? What is the space velocity of ethylene glycol? Product distribution and the selectivity for glyoxal? Is there moisture present in the reaction materials, and what is the range of the oxygen/alcohol ratio? The price of the catalyst? Methods for catalyst regeneration, etc. What other industrial catalysts are currently available for the oxidation of ethylene glycol to glyoxal? I hope the experts in this forum will kindly offer their guidance. Thank you. My contact information: frm1980@163.com.
Production process: Ethylene glycol is first heated to 190–200 degrees to cause it to vaporize. After vaporization, it is mixed with steam, preheated air, and nitrogen. In the presence of a silver catalyst, the mixture is heated to around 500 degrees. The space velocity of ethylene glycol is 0.02–0.006 m/s, the oxygen/alcohol ratio is 0.8–2:1, and the alcohol-to-water ratio is 1:1–2. The ethylene glycol conversion rate is 98.5–99.9%, with a selectivity for glyoxal of 80–86%.
I’d like to ask what the specific energy consumption per unit is for water, electricity, and gas? How much can an investment of 30,000 tons per year yield?
The catalyst for the oxidation of ethylene glycol to glyoxal is mainly electrolytic silver, with an oxygen/alcohol ratio of 1.1–1.2
Our company’s glyoxal project is produced in exactly the way you described
Is this catalyst sponge silver? Does it require pretreatment and activation?
What should I do if the formaldehyde content is very high?