Discussion on the issue of acetic acid formation from methanol carbonyl
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As is well known, the main production methods for acetic acid include the ethylene method, the alcohol method, and the methanol carbonylation method. Due to its advantages in terms of production process and cost, the methanol carbonylation method has become the dominant technology in the acetic acid industry. However, acetic acid produced by the methanol carbonylation method contains trace impurities, which have had fatal effects on downstream industries (especially vinyl acetate). I hope everyone can discuss this and see if there are any better solutions
Acetic acid produced by the methanol carbonylation method contains trace impurities, which have had fatal effects on downstream industries (especially vinyl acetate). It can only be said that the design and operation standards are poor!
Could you explain what so-called trace impurities are? Formic acid? Propionic acid? Acetaldehyde? Still methyl ester? Iodide ions? Catalyst inflow? Is it still limited by acetic acid: arsenic content, mercury content?
Could you explain what so-called trace impurities are? Inflow of catalyst (various forms of iodine)
In acetic acid synthesized via carbonylation in places such as Taiwan and Japan, the total iodine content is less than 2 ppb, that is, less than two parts in a billion. This impurity shouldn’t affect the production of subsequent acetic acid products, right?
However, the total iodine content of acetic acid produced by the domestic carbonylation method is much higher than 2 ppb
Check Yutianhua’s; it shouldn’t be very high
Our carbonylation process has only been in operation for a few years; high levels of impurities are natural at this stage, and things will gradually improve
The key is I; there is usually a stripping process in the later stage!
Adding a removal process can eliminate it.
Actually, alkali solution can be used for deiodination; the iodine content is around 20 ppb when we don’t carry out any treatment, and it drops to 2–3 ppb after treatment. In fact, this concentration is only a few parts in a billion – what impact can it possibly have on vinyl acetate?
On the 12th floor. What silver-bearing resin to use?
It seems these problems have already been solved in China; the technologies are all feasible.