Control of alkali concentration in distillation
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In distillation production, at what level is the concentration of alkali solution generally controlled? Do the old second tower and the newer third tower control the same concentration? What is the general basis for this?
Generally, it is kept at 3-5%. This is related to the flow rate of your lye pump. Just ensure that the methanol is neutral. The lye concentration should have nothing to do with the tower type, but is related to the amount of acidic substances in the crude methanol. To put it bluntly, it mainly depends on whether the amount of alkali added can neutralize the acid in the crude methanol. In addition, if the alkali concentration is too high, alkali will easily precipitate in the alkali pump pipeline and block the pipeline, especially in winter.
I have read in the information that in two-tower distillation, the concentration of alkali solution is controlled at 8-10%. Is this concentration available in three-tower distillation? Is it a little high?
In fact, the concentration does not need to be too high, usually about 10%, as long as the pH value can be guaranteed, a lower point is easier to adjust.
Ours is 2-5 (percentage). This mainly depends on the acid content of methanol. The prognosis is as long as the pH is 8-9.
In fact, the concentration should not be too high. We generally control it at 2-4%. As long as the pH value in methanol can be guaranteed to be 6-7, a lower point is easier to adjust.
The alkali concentration requirement is not too strict, just around 10.
We control between 2-5% and control the PH according to the flow rate
It should be controlled at about 5%. The control of two towers is more precise than that of three towers.
The pH value is controlled at 7---9