Methanol potassium permanganate experiment

This post was last edited by he*aoyu8911 on 2017-7-24 at 16:21. I haven’t studied certain substances in detail, as I’m not involved in research work. The so-called permanganate acid test is simply a method used to determine the amount of reducing substances through strong oxidants; when there’s a high level of reducing substances, there will inevitably be more impurities as well. It serves merely as a basis for determining the amount of impurities, and it’s not just the impurities that affect the permanganate test – in fact, all types of impurities are affected. This is different in the context of research; in production, attention must be paid to the procedures and adjustments needed. As for the adjustments – such as adding water, adding main product reflux, appropriately reducing the temperature at the bottom of the tower, or increasing the amount of product taken off via side streams – everything is explained in detail in the relevant materials, so I won’t go into further detail here. This is generally how I proceed: when one column does not perform well, I make appropriate adjustments. When both columns are not performing well, I promptly reduce the distillation load, and once performance improves, I gradually increase it back again – this is an easier approach than making drastic adjustments. Also, I won’t go into detail here about the situation where there are many by-products in the catalyst over time; generally, reducing the load and adding it back is applicable when the catalyst is still in good condition. The total time is short, and the results are quick. Of course, the prerequisite is that the top leader must be confident in your adjustments before agreeing to a reduction for you

The potassium permanganate test can only determine the content of reducing substances, which are mainly methyl formate and aldehydes (primarily acetaldehyde). This is because the C=C and C=O bonds are reducible.

Why does a high pH level also affect the potassium permanganate test? Why does the acid value increase when too much alkali is added? Why does the amount of alkali added shorten the duration of the potassium permanganate experiment? 、

It’s been two years since I was working at the methanol plant. I remember that it was said that adding alkali helps with the decomposition of carbonyl compounds, or some other type of compounds. I recall that discussions took place on this topic; it seems to have an effect, but not a very significant one

The short duration of the potassium permanganate test indicates the presence of reducing substances in methanol; the shorter the time, the more such substances are present. 1. The amount of alkali can be increased appropriately, but to monitor the prognostic PH, it should be maintained at 8–9. 2. The temperature of the pre-tower bottom stream can be appropriately increased, and the amount of desalinated water can be increased accordingly. 3. The main tower can increase the return flow rate, thereby preventing the temperature at the top of the main tower from rising too high. 4. Address the root causes, improve synthesis conditions, and reduce by-products.