Separation of olefins from FCC naphtha by propylene carbonate: Influence of critical component structure and correlation of ternary LLE thermodynamic models

Zhang, Yuhao; Wang, Hui; Sun, Dexin; Zhao, Liang; Gao, Jinsen; Chen, Xu

doi:10.1016/j.fuproc.2019.106198

Cited by 15 publications

(11 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, the water + alcohols + gasoline system has been utilized by Stephenson 15 19 Subsequently, the ability of propylene carbonate to separate olefins from naphtha was assessed through an investigation on the ternary LLE of the propylene carbonate + aromatics/sulfides (naphtha) + olefin system, and the NRTL and UNIQUAC thermodynamic models were employed to reproduce the experimental data. 20 Utilizing the distillation process for separating acetic acid and water components necessitates a column with many stages and a great reflux ratio, thus entailing high running costs. 21 In turn, liquid−liquid extraction, due to the lower energy cost, is widely used to separate acetic acid from aqueous solutions, and in this respect, many solvents have been tried.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, olefins were separated from catalytic cracking of naphtha based on the LLE data from aromatics/sulfide (naphtha) + olefin + dimethyl sulfoxide systems and employing the NRTL and UNIQUAC models for theoretical investigations . Subsequently, the ability of propylene carbonate to separate olefins from naphtha was assessed through an investigation on the ternary LLE of the propylene carbonate + aromatics/sulfides (naphtha) + olefin system, and the NRTL and UNIQUAC thermodynamic models were employed to reproduce the experimental data …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Liquid–Liquid Equilibrium Study of the Water + Acetic Acid + Kerosene Ternary System at 293.2, 298.2, and 308.2 K

Jafari

Saien

2021

J. Chem. Eng. Data

View full text Add to dashboard Cite

The chemical system of water + acetic acid + kerosene is frequently used in different liquid–liquid extraction studies. Accordingly, a comprehensive knowledge about this system is essential. The present study reports the capabilities of kerosene in extracting acetic acid from aqueous solutions at conventional temperatures of 293.2, 298.2, and 308.2 K and under an ambient pressure of 81.5 kPa. The cloud point method and refractive index measurement were employed in experiments. The distribution coefficient of the solute was within (0.0536–0.1161) and the important separation factor was within (5.07–82.84). The upper limit values in the ranges of the latter parameter were 1.36–8.80 times of those with other solvents. The distribution coefficient increased with temperature, but the separation factor diminished. The provided data were reproduced with the nonrandom two-liquid and universal quasichemical activity coefficient models, and the corresponding binary interactions were determined at each temperature. In this regard, a surrogate of kerosene, consisting of 80 wt % n-decane and 20 wt % 1,2,4-trimethylbenzene, was considered. The root mean square deviations of, respectively, (0.0035–0.0057) and (0.0056–0.0067) and also other criteria revealed good agreements between experimental and predicted values.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid Equilibrium Study of the Water + Acetic Acid + Kerosene Ternary System at 293.2, 298.2, and 308.2 K

Jafari

Saien

2021

J. Chem. Eng. Data

View full text Add to dashboard Cite

show abstract

“…The more important is that based on the dipole‐induced dipole, the combination between SUL solvent and aromatic or thiophene sulfide is in the form of “Plane‐to‐Plane.” 24 As shown in electrostatic potential maps in Figure S3. The plane generated by the SUL's cyclic structure is facing the plane of the cyclic structure of aromatic or thiophene sulfide.…”

Section: Resultsmentioning

confidence: 99%

High efficient separation of olefin from fluid catalytic cracking naphtha: Separation mechanism and universal simulation method

et al. 2021

Self Cite

View full text Add to dashboard Cite

The fluid catalytic cracking (FCC) naphtha critical component‐oriented separation process is an efficient method to produce ultra‐low‐sulfur (<10 μg/g) gasoline with minimal loss of octane number (<1 RON). However, the product quality is highly dependent on the structure of the components of FCC naphtha. Aromatics and thiophene sulfides without a methyl side chain favor the separation of olefin. The major impulse of olefin separation is the solvent‐induced dipole of aromatics or thiophene sulfides, leading to a “Plane‐to‐Plane” combination between the solvent and aromatics or thiophene sulfides, accompanied by a steric hindrance due to their side chains. This condition resulted in 2–3 times greater θ of benzene and thiophene compared with that of toluene and 3‐methylthiophene. In addition, an improved non‐random two‐liquid model was proposed based on the above results, and a simulation method for FCC naphtha solvent extraction process was established. The calculation results accorded well with industry data.

show abstract

“…This also indicated that the effect of SUL on thiophene was increased when the content of thiophene was below 40 v %. This is because the structure of thiophene is similar to that of SUL, thereby facilitating the combination, which has been carefully studied in our previous research. , …”

Section: Results and Discussionmentioning

confidence: 99%

“…This is because the initial dipole moment of thiophene is 0.786D, which is greater than that of benzene (0D). The initial dipole moment also affects the combination of the component and solvent . Last but not least, thiophene is more likely to combine with the SUL solvent than 3-methylthiophene.…”

Section: Introductionmentioning

confidence: 99%

Desulfurization of Fluid Catalytic Cracking Naphtha by Extractive Distillation: A Universal Simulation Method Established Using the Universal Quasi-Chemical Functional Group Activity Coefficient Model

et al. 2021

Self Cite

View full text Add to dashboard Cite

The extractive distillation process is gradually being used for the desulfurization of fluid catalytic cracking (FCC) naphtha because of its excellent octane number protection performance during desulfurization. The key to this process is the separation of sulfides. However, the composition of FCC naphtha is complicated and easily changes, which seriously affect the separation performance. The operating conditions need to be adjusted frequently with the change in the different properties of feedstocks, which cost time, manpower, and investment. In this study, we introduce a simulation method using the universal quasi-chemical functional group activity coefficient (UNIFAC) model to predict the process of desulfurization. In the simulation, the group binary parameters for the UNIFAC model seriously affect the reliability of the method. Therefore, the lacking parameters of the solvent and sulfides were first regressively calculated by the experimental results of the binary vapor−liquid equilibrium (VLE). All the values of (D−J) by the Herington integral method were under 10, which means that the parameters obtained in this work were well correlated to those of the VLE experiments. Based on this, the prediction simulation method was established and the maximum error of the compositions of the products between simulation and real-oil experiment was only 0.5 wt %. According to the simulation, 98% of sulfides could be extracted under the optimal conditions (113 °C at the extraction column, 178 °C at the solvent recycle column, etc.). The rule of the extraction of sulfides was thiophene sulfur > mercaptan sulfur > thioether sulfur, which is consistent with the VLE study results. The sulfur content of the raffinate oil was decreased to 9.3 mg/kg. It well met the latest gasoline standard and is appropriate for the prediction of the desulfurization of FCC naphtha by the extractive distillation process.

show abstract

Separation of olefins from FCC naphtha by propylene carbonate: Influence of critical component structure and correlation of ternary LLE thermodynamic models

Cited by 15 publications

References 42 publications

Liquid–Liquid Equilibrium Study of the Water + Acetic Acid + Kerosene Ternary System at 293.2, 298.2, and 308.2 K

Liquid–Liquid Equilibrium Study of the Water + Acetic Acid + Kerosene Ternary System at 293.2, 298.2, and 308.2 K

High efficient separation of olefin from fluid catalytic cracking naphtha: Separation mechanism and universal simulation method

Desulfurization of Fluid Catalytic Cracking Naphtha by Extractive Distillation: A Universal Simulation Method Established Using the Universal Quasi-Chemical Functional Group Activity Coefficient Model

Contact Info

Product

Resources

About