Residual of individual light components in the bottom of the distillation column
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At present, the purity of the product in one of the company’s production units does not meet the required standards. GC analysis revealed that the main issue is the high levels of four precursor peaks; since a qualitative analysis has not been conducted, it is not known what substances these are. The specific separation process involves passing the reaction mixture through a light removal tower, a solvent recovery tower, and a dehydration tower to remove water and light components, after which it enters the final product distillation tower from where the finished product is obtained at the top of the tower. What is puzzling at present is that no matter how adjustments are made, these few light components always end up in the final product; in fact, even those substances whose peak times come after those impurities are no longer present. I would like to ask what might be the possible reasons for this?
With such a vague description, not even the gods can help you. At the very least, it is necessary to clarify the specific manufacturing processes, control parameters, and media used. It would be ideal to include a diagram from the DCS control screen; curves showing fluctuations in important parameters would be even better.
This post was last edited by goldliyang on 2020-11-12 at 14:13. Those peaks earlier might also be reconstituted components; it is recommended to analyze the bottom of the product tower to see if the concentration of these peaks is higher there