On the etherification of gasoline, MTBE, alkylation, isomerization, and aromatization
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This post was last edited by jacques0920 on 2017-1-10 at 11:43. Hello everyone, is there any relationship between light gasoline etherification, MTBE, alkylation, isomerization, and aromatization as mentioned in the production of clean gasoline? Can they replace each other? Thank you.
They are all used to produce gasoline blending components; none of them can replace the others. The choice is made based on actual production conditions
No, relatively speaking, alkylated oil is the best component for blending gasoline to meet National VI standards.
Although these are processes for producing components of high-octane gasoline, there are significant differences among them, in terms of raw materials, production process conditions, and product types. Saying they are more or less the same is extremely amateurish. Light gasoline etherification is a process in which methanol is used as the etherifying alcohol to react with small-molecule olefins in light gasoline, thereby producing gasoline containing mixed ethers. MTBE is produced by reacting isobutylene in the liquefied gas fraction with methanol to form methyl tert-butyl ether; this process yields a single type of ether, and its principle is similar to that of etherification in light gasoline. Alkylation is a process in which isobutylene and propylene from liquefied gas fractions are used, through an alkylation reaction, to produce isomeric alkanes. The alkylated product gasoline can be used directly as a component of gasoline. Isomerization involves the use of isomerization catalysts (usually containing precious metals, similar to reforming catalysts) to convert straight-chain hydrocarbons in gasoline components into branched isoparaffins, thereby increasing their octane rating. Isomerization generally also uses lighter gasoline components. Aromatization is a reforming process that converts hydrocarbons into hydrocarbons containing aromatic rings; one type is used for producing aromatics, while the other is used for producing high-octane gasoline.
Alkylation should be isobutylene and isobutane, not propylene
This post was last edited by qugd on 2018-1-23 at 10:27. If propylene is present in the raw materials, it also participates in the alkylation process, as the reactivity of the allyl group makes it suitable for alkylation reactions as well. In some mixed liquefied gas feedstocks, propylene may not be separated out; especially in smaller-scale catalytic cracking units, if there is no subsequent production of polypropylene and no suitable demand for propylene, it is entirely feasible to carry out alkylation. Isooctane (2,3-dimethylpentane), produced from propylene and isobutane, is also an octane number component.
I’ve learned something, but I’m not sure whether using acrylic is appropriate from a cost perspective
It definitely isn’t appropriate; the price difference is too large
It’s absolutely not suitable. . Propylene costs over 10,000 yuan per ton, while alkane oil costs 6,000 yuan or even less. . .