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

Abstract

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.

Hydrocarbon Extraction with Ionic Liquids

“…Achieving efficient separation of a particular category or specific substance from hydrocarbon mixtures in order to obtain high-purity target products is thus highly important and meaningful. Liquid–liquid extraction is a unit operation with low energy consumption compared with distillation processes and is commonly used in industry for the separation of aromatic and aliphatic hydrocarbons, − extractive separation of aromatics and olefins in some catalytic cracking gasoline refinement processes, − desulfurization and denitrification of fuel oil products, − extraction of organic acid and alcohol products from fermentation broth, − and recovery of acid and phenol products from wastewater. − …”

Highly Versatile, Non‐noble Metal‐Based Catalytic Process for the Production of Green Aromatics and High‐Octane Fuel from Bio‐Derived Hydrocarbon Mix

“…The low value paraffins/iso-paraffins can be converted into valuable chemicals like aromatics and olefins. [2][3][4][5] Amongst various chemicals, aromatics are of paramount importance owing to their utility as a precursor for various useful chemicals, as an octane booster, [6] as a solvent, [7] and for the production of polymer, [8] insecticide, [9] detergent, [10] dye, [11] flavorings agents, [12] medicines, and so forth. [13][14][15] Due to their emerging applications, it is estimated that the demand for aromatics shall increase very rapidly in the near future.…”

Extraction of polycyclic aromatic hydrocarbons from fluid catalytic cracking diesel with ionic liquids

“…In line with the state-of-the-art molecular chemical engineering, "molecular refining" is cogent to refine FCC diesel at the molecular level. 8 PAHs should be separated from FCC diesel, improving the quality of diesel and getting the high cetane number diesel product. In this case, breaking the limitations of conventional molecular solvents and constructing a suitable extraction medium with molecular recognition ability is necessary to realize the high selective separation of structural analogues.…”

“…In principle, these thermodynamic properties are of molecular characteristics in relation to molecular structures and intermolecular interactions. In line with the state‐of‐the‐art molecular chemical engineering, “molecular refining” is cogent to refine FCC diesel at the molecular level 8 . PAHs should be separated from FCC diesel, improving the quality of diesel and getting the high cetane number diesel product.…”