Alkylation alkali washing temperature
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There is a alkali washing step in the alkylation purification process. I would like to ask what the purpose of this alkali washing is? What is the alkali washing temperature, and what is the alkali concentration? What are the consequences of too high an alkali washing temperature, and what are the consequences of too low a temperature? What are the consequences of too high an alkali cleaning concentration? What happens when the alkali cleaning concentration is too high? Could everyone please help solve this? Thank you all!
Everyone, please help solve this quickly
It’s in an acidic environment, meaning the sulfate esters are formed, right? Is controlling the temperature and concentration to ensure full reaction between the alkali solution and sulfuric acid? Please provide a detailed explanation; I have been looking into this question for a long time.
As for what will be generated specifically, I’m sorry – I’m not in this field and haven’t conducted specific research on it! As for the concentration and temperature of the alkaline solution, I can explain the reasons: Concentration: Generally, the higher the concentration, the better the removal effect; however, considerations such as the safety of users and the corrosion of related equipment must be taken into account, which is why the solution is diluted to an optimal concentration before use. Temperature: I recall there being a graph showing the relationship between the temperature of the alkaline solution and the removal efficiency; after 40°C, the increase in efficiency is minimal, so it is necessary to control the temperature at an appropriate level. In summary, since there are relevant requirements aimed at ensuring that the reaction proceeds in the desired direction, it is necessary to pay attention to the relationships and changes among these parameters during the operation
The product of the alkylation reaction (containing approximately 60%–70% isobutane and 40%–30% alkylated oil) is mixed with 98% concentrated sulfuric acid and fed into an electrosedimentation unit in an emulsified state. The concentrated sulfuric acid dissolves and absorbs the acidic sulfates and neutral esters present in the product; under the influence of an internal electric field, the mixed emulsion separates, with the acid being reused. The hydrocarbon products flow out from the top and are then mixed with alkaline water having a pH of 8–10 to form an emulsion, which is fed into an alkaline wash electrosedimentation unit. There, under the action of an electric field, the alkaline water is separated from the hydrocarbon products, and this alkaline water is also reused. The hydrocarbon products flow out from the top and are fed into a distillation tower.
In other words, of the product mixture coming out of the alkylation reactor, only 30–40% is alkylated oil, while the remaining 60–70% consists of excess isobutane? Is this the result of ensuring the alkene-to-olefin ratio (which is 8–15 in our case)? The process is a bit different; we don’t have an acid washing process here, only alkali washing. The equipment used for alkali washing is slightly different, as we don’t use electric fields.