What does lightly alkylated oil refer to?
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I read in a document that when the isobutane concentration (in the hydrocarbon phase of the reaction effluent) reaches 85%, the alkylated oil is almost identical to the lightly alkylated oil without the need for further separation. Hey guys, what is the lightly alkylated oil mentioned here?
Alkylated oils are an important component of reformulated gasoline (RFG); they have a low RVP (Reid vapor pressure), contain no benzene or aromatics, have a high octane rating, and have low sulfur content or are sulfur-free. Alkylated oils account for 13% of the total composition of gasoline in the United States, and this proportion is estimated to be 20.7% in RFG.
Although it’s not the right answer, thanks for participating
Alkylated gasoline is produced by reacting isobutane in LPG with butene-1, butene-2, and isobutylene to form isooctane; as a result, its components are all isooctane. It has a high octane rating, good sensitivity, low vapor pressure, and a wide boiling range. Being a saturated hydrocarbon free of aromatics, sulfur, and olefins, it is an ideal component for high-octane, clean gasoline........... Found on Baidu. . It should be the oil obtained through an alkylation reaction. The lightly alkylated oil mentioned here should be a light oil around the C5C6 range. I’m just participating too; I’m not an expert :)
This post was last edited by klinsmann36 on 2015-8-11 22:57. In the standard refining process, the alkylation system, using catalysts such as sulfonic acid or hydrofluoric acid, combines low-molecular-weight olefins (primarily propylene and butylene) with isobutane to form alkylates (mainly higher-octane hydrocarbons and branched-chain hydrocarbons). Alkylates are a type of gasoline additive that provides anti-knock properties and produces clean combustion products. The octane number of alkylates depends on the type of olefin used and the reaction conditions applied.
Lightly alkylated oils refer to components of C8 and below, resulting from the addition of isobutane to the isomers of butylene. However, in the complex alkylation process, addition reactions do not necessarily occur; simultaneously, polymerization, disproportionation reactions take place, resulting in components with a dry point greater than 205. I’m not sure if this explanation will be understandable.
May I ask if C5 participates in the alkylation reaction?
Theoretically, pentene is reactive, but the alkylated oil produced has a low octane number.
C5 includes n-pentane and pentene; n-pentane does not participate in the reaction and serves as a diluent in alkylation reactions. Pentene reacts with sulfuric acid, which increases acid consumption; as a result, the main reaction does not proceed properly, and no product is formed along with impurities
Lightly alkylated oil is also known as aviation kerosene. Compared with alkylated oil used in vehicles, the main difference lies in their saturated vapor pressures: the saturated vapor pressure of alkylated oil used in vehicles is generally kept between 30-50 KPa, while that of lightly alkylated oil is maintained at 80-100 KPa. Mainly, the light components content in the lightly alkylated oil is high. As for the claim made by the original poster that the isobutane concentration in the effluent is 85%, indicating it is a light alkylation oil, I have never heard of that. Neither regular alkylated oil nor light alkylated oil contains isobutane, unless it is due to some operational errors. Light and heavy alkylated oils differ only in the content of n-butane
You’re wronging me here; I didn’t say that the alkylated oil contains isobutane. What I meant was the reaction effluent. Process: The reaction products are first separated in an isobutane removal column, and then the heavier components are separated in a n-butane removal column; the resulting product is alkylated oil. To obtain light alkylated oil, another separation step in a column is required. What’s being discussed here is increasing the alkene-to-alkane ratio; in that case, there’s no need for tower separation, and the lightly alkylated oil can be obtained directly. However, as the alkene-to-alkane ratio increases, the yield certainly decreases. I’m just asking if anyone has tried this approach.