Why does the aldehyde content in the storage tank gradually increase to an unacceptable level despite the production of qualified ethylene glycol?
Thread Content
As the title suggests, are there any friends in the ethylene glycol industry? Could they offer some advice? Thank you
But the storage tank has a nitrogen seal; the oxygen content on our side of the tank is around 0.5%
Air oxidation is not possible because the acetal impurities in your ethylene glycol product have not been removed completely. Is this ethylene glycol obtained through the hydrogenation of dimethyl oxalate?
Where does the technology come from? Danhua, high chemistry? Which set of devices are you using? In fact, for the products obtained after ester hydrogenation, it is quite difficult to achieve polymer-grade quality solely through distillation separation, and the yield of the products is also affected by this.
It’s not as complicated as you think; the product quality is quite good
The product quality is good; it’s probably because the results from the gas chromatography analysis conducted in our own laboratory are satisfactory. What is the evaluation of its application in the downstream polyester industry, and what is the proportion of chemical ethylene glycol used?
We are dealing with a process related to SHELL; we suspect it’s also an acetal-type substance, as it cannot be removed even through an aldehyde-removing resin bed
Although I don’t know much about the production of ethylene glycol using the cycloethane method, literature reports also indicate an acetal problem in ethylene glycol products. Acetals are formed during the reaction process, not during storage, but acetals and their precursors may continue to produce other colored substances in an aerobic environment. Moreover, acetal compounds are inevitably formed during the reaction process, but their formation can be reduced through the selection of catalysts and appropriate process conditions ； Acetal compounds can also meet the requirements through subsequent physical methods, but the cost is high and it affects the yield of the product.
Maybe the reaction system produces too many impurities, which has an impact :)