What is the function of the alkali injection line before the alkylation effluent wash tank?
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After being treated with propane for alkaline washing, the DuPont alkylating alkaline solution is divided into two streams: one stream goes to the outlet for alkaline washing, while the other stream goes directly to the inlet for aqueous washing. I would like to know what the purpose of this second stream is It’s not turned on under normal operating conditions; is it used as a emergency measure when the pH after water washing is too low?
We also use the DuPont method for alkylation; I didn’t see this wire on site... It’s likely that the design team removed it as part of the optimization process
It acts as a secondary route, I guess: lol
Is it used during shutdown for maintenance to neutralize the acid remaining in the tank, through acid-base neutralization followed by water washing?
Maybe, but the alkali solution used for the washing process can be obtained from the alkali cleaning step; moreover, is alkali needed to neutralize the solution used in washing? It should be possible to handle situations where a large amount of acid leaks through
It probably won’t be useful; once the water washing tank becomes acidic, it indicates that there was a problem earlier on. One should start by examining process parameters such as the olefin to alkene ratio, the acid to hydrocarbon ratio, and the reaction temperature.
The system should be alkali-washed when parking