Propane issues in the alkylation unit
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A portion of propane needs to be withdrawn from the alkylation unit; does this propane come from the reaction or is it brought in as a raw material? ?
The raw material is brought in; the reaction does not produce terpenes
There is a light hydrocarbon removal tower before the alkylation reactor, right? Can’t this tower remove propane from the feedstock? ?
It can be removed, but it isn’t 100% effective; some of the terpenes will definitely make their way into the subsequent systems. These terpenes will gradually accumulate in the recycled isobutane and refrigerant systems, causing pressure to rise
The depropanization tower removes most of the propane.
The propane content in the coolant used in alkyl sulfate production must be controlled during coolant analysis. If its level is too high, it will affect the alkene-to-alkane ratio, leading to an increase in reactor pressure and a greater load on the compressor. On the other hand, if the level is too low, the heat removal effect during flashing will be reduced, causing the coolant temperature to rise. At atmospheric pressure, the boiling point of propane is lower than that of isobutane; when vaporization occurs in the same volume under reduced pressure, propane absorbs significantly more heat during vaporization than isobutane, which means its cooling effect is better compared to that of pure isobutane. Therefore, there is a significant difference between cooling by the flash evaporation of reaction products without propane and cooling by the flash evaporation of a certain amount of propane as reaction products. The optimal level is 5-8%. The effect of C3 content on the reaction temperature is significant. The requirement is no more than 11%; if it exceeds this level, it must be discharged outside. If it’s too low, turn off the external discharge.
The propane content in the coolant used in alkyl sulfate production is brought into the reactor as a result of incomplete removal during the previous raw material preprocessing step, namely at the bottom of the dehydrogenation tower. This carbon triolefin will gradually accumulate in the cyclopropane and refrigerant systems, leading to increased pressure. In refrigerant analysis, it is necessary to maintain a certain level of propane content; too high a level can affect the alkane-to-olefin ratio, resulting in increased reactor pressure and greater load on the compressor. On the other hand, too low a level can reduce the efficiency of heat removal during flashing, causing the refrigerant temperature to rise. At atmospheric pressure, the boiling point of propane is lower than that of isobutane; when vaporization occurs in the same volume under reduced pressure, propane absorbs significantly more heat during vaporization than isobutane, which means its cooling effect is better compared to that of pure isobutane. Therefore, there is a significant difference between cooling by the flash evaporation of reaction products without propane and cooling by the flash evaporation of a certain amount of propane as reaction products. The optimal level is 5-8%. The effect of C3 content on the reaction temperature is significant. The requirement is no more than 11%; if it exceeds this level, it must be discharged outside. If it’s too low, turn off the external discharge
This extra propane must have come from the raw materials, right? It wasn’t produced as a result of the reaction, right? ?
Whose technology does your plant’s alkylation unit use? ?
How does a higher propane content affect the alkene-to-olefin ratio? ? Propane won’t react with the olefins in the feedstock, right? It acts as an inert component in it.