CHANGES IN REID VAPOR PRESSURE OF GASOLINE IN VEHICLE TANKS AS THE GASOLINE IS USED

1989 ◽  
Author(s):  
A. D. Brownlow ◽  
J. K. Brunner ◽  
J. S. Welstand
1955 ◽  
Vol 27 (1) ◽  
pp. 142-144 ◽  
Author(s):  
R. L. LeTourneau ◽  
J. F. Johnson ◽  
W. H. Ellis

2019 ◽  
Vol 12 (2) ◽  
pp. 112-117
Author(s):  
Shahad Mahdi Saeed ◽  
Husham AL.Tameemi

An assessment was made for the impact resulted by the addition of (DO) and (DOA) on the octane number and Reid vapor pressure (RVP) of gasoline with different chemical compositions. The locally produced gasoline had been blended with three different ratios (v/v) of the additives, i.e. 8, 10 and 15%. The octane rating of gasoline was observed to continuous increased and linearly with the addition of (DO and DOA). The DOA-gasoline blends produced higher octane number. The two additives observed that decreased significantly the RVP and CV of the original fractions when blended with gasoline. However, additives were add in (8, 10, 15%vol) to gasoline blend, increasing RON was (0.9-23.9).


2021 ◽  
Vol 6 (2) ◽  
pp. 135-149
Author(s):  
Haris Numan Aulia ◽  
Zami Furqon

The distillation process in the debutanizer column has an essential role in separating the catalytic naphtha product from the light fraction consisting of C3 and C4 hydrocarbon components, both saturated and unsaturated. The naphtha catalytic product is used to blend gasoline because it has a high octane number. The distillation process in the column produces the bottom product of catalytic naphtha and the top product, which is the feed for the stabilizer column. In order to obtain the quantity and quality of catalytic naphtha products, it is necessary to adjust the operating conditions of the debutanizer column properly so that a product that meets the desired specifications is obtained. The method used is the short-cut calculation method which includes the calculation of the material balance and the determination of the condition of the incoming feed. Data collection is obtained from data in the industry. After calculating the material balance of the debutanizer column, the composition of the hydrocarbon constituents of the feed, the top product, and the bottom product can be seen. From the composition data, it can be seen the relationship between operating conditions and the quality of the resulting product. The higher the column operating pressure, the lighter components will be affected, increasing the C4 minus content carried to the bottom product. The higher the C4 minus content, the higher the octane number of catalytic naphtha, but this also affects the Reid Vapor Pressure (RVP) of catalytic naphtha, which also increases. Setting the operating pressure of the column should still pay attention to the product RVP limits, so that product specifications are fulfilled.ABSTRAKProses distilasi pada kolom debutanizer memiliki peran yang penting untuk memisahkan produk catalytic naphta dari fraksi ringan yang terdiri atas komponen hidrokarbon C3 dan C4, baik jenuh maupun tak jenuh. Produk catalytic naphta tersebut digunakan sebagai komponen blending gasoline karena memiliki angka oktan yang tinggi. Proses distilasi pada kolom tersebut dihasilkan produk bawah catalytic naphta dan produk atasnya yang merupakan umpan bagi kolom stabilizer. Untuk mendapatkan kuantitas dan kualitas produk catalytic naphta, maka diperlukan pengaturan kondisi operasi kolom debutanizer yang tepat sehingga diperoleh produk yang sesuai dengan spesifikasi yang diinginkan. Metode yang digunakan adalah metode perhitungan short-cut yang meliputi perhitungan material balance, dan penentuan kondisi umpan masuk. Pengumpulan data didapatkan dari data di industri. Setelah dilakukan perhitungan material balance kolom debutanizer dapat diketahui komposisi hidrokarbon penyusun umpan, produk atas, dan juga produk bawah. Dari data komposisi tersebut dapat diketahui hubungan antara kondisi operasi terhadap kualitas produk yang dihasilkan. Semakin tinggi tekanan operasi kolom, maka akan mempengaruhi komponen ringan, yakni meningkatkan kandungan C4 minus yang terikut ke produk bawah. Semakin tinggi kandungan C4 minus maka akan meningkatkan angka oktan  dari catalytic naphta, namun hal ini juga berpengaruh pada Reid Vapor Pressure (RVP) catalytic naphta yang juga meningkat. Pengaturan tekanan operasi kolom tersebut hendaknya tetap memperhatikan batasan RVP produk agar spesifikasi produk terpenuhi.


2018 ◽  
Vol 20 (5) ◽  
pp. 501-509 ◽  
Author(s):  
Isaac Schifter ◽  
Luis Diaz ◽  
Uriel Gonzalez ◽  
Carmen Gonzalez-Macias ◽  
Isidro Mejía-Centeno

The scope of the work carried out is aimed to evaluate the effects of blending methanol in the gasoline pool, particularly octane number and Reid vapor pressure increase when methanol is substituting methyl-tertiary-butyl ether in the formulation of Regular and Premium base gasolines. Isopropyl alcohol and ethanol have been investigated and found to be a promising co-blending alcohol to be mixed in gasoline methanol blends. Isopropyl alcohol is most effective below 3 vol%. Ethanol has been found to be the most promising co-blending alcohol able to reduce the Reid vapor pressure increase by 1.4 psi even with concentrations in the range of 2 vol%. The addition of isopropyl alcohol to the methanol–gasoline blends has shown the ability of a ternary mixture to further reduce the Reid vapor pressure of the finished gasoline and, subject to availability and price of isopropyl alcohol, could be of interest in further formulation studies focused on maximizing the saving on finished gasoline cost by reducing the Reid vapor pressure of base gasoline and/or increasing the methanol content.


Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4623
Author(s):  
Valerio Mariani ◽  
Leonardo Pulga ◽  
Gian Marco Bianchi ◽  
Stefania Falfari ◽  
Claudio Forte

Many researchers in industry and academia are showing an increasing interest in the definition of fuel surrogates for Computational Fluid Dynamics simulation applications. This need is mainly driven by the necessity of the engine research community to anticipate the effects of new gasoline formulations and combustion modes (e.g., Homogeneous Charge Compression Ignition, Spark Assisted Compression Ignition) to meet future emission regulations. Since those solutions strongly rely on the tailored mixture distribution, the simulation and accurate prediction of the mixture formation will be mandatory. Focusing purely on the definition of surrogates to emulate liquid phase and liquid-vapor equilibrium of gasolines, the following target properties are considered in this work: density, Reid vapor pressure, chemical macro-composition and volatility. A set of robust algorithms has been developed for the prediction of volatility and Reid vapor pressure. A Bayesian optimization algorithm based on a customized merit function has been developed to allow for the efficient definition of surrogate formulations from a palette of 15 pure compounds. The developed methodology has been applied on different real gasolines from literature in order to identify their optima surrogates. Furthermore, the ‘unicity’ of the surrogate composition is discussed by comparing the optimum solution with the most different one available in the pool of equivalent-valuable solutions. The proposed methodology has proven the potential to formulate surrogates characterized by an overall good agreement with the target properties of the experimental gasolines (max relative error below 10%, average relative error around 3%). In particular, the shape and the end-tails of the distillation curve are well captured. Furthermore, an accurate prediction of key chemical macro-components such as ethanol and aromatics and their influence on evaporative behavior is achieved. The study of the ‘unicity’ of the surrogate composition has revealed that (i) the unicity is strongly correlated with the accuracy and that (ii) both ‘unicity’ and accuracy of the prediction are very sensitive to the high presence of aromatics.


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