Based on which parameters is the reflux of the acetylene butadiene dewaxing column in the ACN process adjusted?
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The reflux in the light-end removal tower is adjusted based on the butadiene water value and the content of methyl acetylene in the product. The following points should be taken into consideration during this adjustment: The reflux in the light-end removal tower is controlled by adjusting the heat supply to the bottom of the tower; only when the heat supply to the bottom of the tower increases can the liquid level in the tank rise, and it is this increase in liquid level that leads to an increase in reflux. To increase heat supply, it is necessary to raise the amount of heat solvent added or increase the temperature of the heat solvent entering the reboiler; therefore, when making adjustments, care must be taken to maintain the balance of the solvent heat recovery system to prevent any fluctuations in the system. When methyl acetylene is not detectable in the product, it is advantageous for the dehydration process to control the reflux ratio of the light-end stripping tower at 1.5 times the feed rate ； Once methylacetylene is present in the product, the reflux ratio can be increased to 1.7 times the feed rate for operation. Although a high reflux ratio is beneficial for removing methylacetylene, it is extremely detrimental to the dehydration process.
Didn’t the original poster make it clear? Under normal circumstances, it’s sufficient to just maintain normal operations； And when a situation like what the original poster mentioned occurs – that is, the propyne content in the product exceeds the allowed level – it’s likely that there’s an issue in the previous processing steps. If actions are taken at the stage of light hydrocarbon removal, then the dehydration effect will inevitably be compromised as a result ； Similarly, an excessive water content means the same thing.