Changes of isobutylene in alkylation reactions
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If the isobutylene content in the raw material is too high (15–20%), what changes will occur in the product after the alkylation reaction? For example, could it cause the final boiling point to be higher?
This post was last edited by Chen Wentao on 2016-11-4 08:24 …
This post was last edited by zhjy200311 on 2016-11-4 at 10:19. In the alkylation process, isobutylene and isobutane combine to form standard octane (2,2,4-trimethylpentane), with a boiling point of around 99–100 degrees. It is likely the isomer of octane with the lowest boiling point, so it probably won’t cause the final boiling point to be too high. For hydrocarbons with the same number of carbon atoms, the higher the degree of branching, the lower their boiling point. Theoretical analysis must also be based on the properties of the actual product (after all, there are always exceptions). An increase in isobutylene content theoretically leads to an increase in the octane rating of the product.
When I see this ingredient, my first thought is that it’s a waste – with such a high content of isobutylene in the raw material, its price must be higher than that of ordinary C4 compounds. Using this kind of raw material as an alkylating agent is a waste of resources. Do you have much of this kind of raw material? Could you give me some? The price is negotiable.
That’s not the case at all; this is a theory, not practice. Moreover, this theory isn’t thoroughly considered either. When using the sulfuric acid method for alkylation, it’s necessary to take into account the reaction mechanism – where do these high-boiling substances come from? Where does the reaction heat come from? How did they react? It’s simply very difficult to control the temperature directly, and there are even more high-boiling substances
Do you know why it’s a waste? Is that true?
High levels of isobutylene are not good. In the simple isobutylene alkylation reaction, the yield of C8 is 50%, while compounds with carbon numbers above C9 account for 35%; as for the compounds with carbon numbers between C5 and C7, the octane rating decreases as well! But it’s indeed a waste; this raw material should be an ethylene product or mixed with ethylene products! Your company must be really rich – spending money like water!
With isobutylene at such a high level, shouldn’t it be consumed first for greater benefits? Is there a mistake?
They don’t. The question is whether it can be used directly in the device; don’t give irrelevant answers. I like to watch you answer questions. This material can also be used, but it’s C4 before etherification. Such a high content comes with problems; I just want to know the same answer as the original poster – it’s not about buying or selling liquefied gas! You’ve filed so many patents, spent years researching this stuff, and built so many devices – have you never encountered such a situation?
When I see this ingredient, my first reaction is that it’s a waste – with such a high content of isobutylene in the raw material, its price must be higher than that of ordinary C4 compounds. Using this kind of raw material as a material for alkylation is a waste