Development of Novel Nonhydrogenation Desulfurization Process — Oxidative Desulfurization of Distillate —

Abstract

This selective review discusses nonhydrogenation desulfurization processes, particularly oxidative desulfuriza tion, for the manufacture of ultra clean fuels. The environmental regulations for transportation fuels are becom ing more and more severe, and the statutory sulfur content in various fuels was reduced to below 10 ppm in 2005, and will be lower in the near future. However, there is considerable doubt whether conventional hydrodesulfur ization processes can provide fuels with sulfur content less than 5 ppm. This review describes recent advances in nonhydrogenation desulfurization processes, particularly oxidative desulfurization, as well as our latest research results. The review consists of three sections as follows. (I) The oxidation reactivities of various sulfurcontaining compounds present in fuels, oxidation and oxidative mechanisms for various oxidant-catalyst systems are introduced. (II) The oxidation of various practical fuels such as light gas oil, kerosene, and vacuum gas oil, and others are described; and the potential of various oxidative desulfurization processes for the fuels are evaluated. (III) Removal methods of oxidized sulfur compounds in various fuels are described.

Biodesulfurization: a mini review about the immediate search for the future technology

“…Moreover, in this eastern country, both fuels like gasoline and diesel have a lower quantity than the 10 ppm sulfur. As per Europe, in 2003, legislation was put in place to reduce the sulfur content from 350 to 50 ppm in 2005 and a subsequent decrease to 10 ppm for later in 2007 (Quian 2008).…”

Adsorptive Separation of Infinitesimal Sulfur Oxide in Naphtha —Reactivation of Silica Gel Using Toluene and Dimethyl Ether—

“…Solvents with high boiling points are not also suitable because too much heat is required for recovery by distillation. Polar solvents with low boiling points, such as tetrahydrofuran, are often used for reactivation 10) . However, such solvents require a lot of coolant to remove sulfur oxides by distillation, which is quite costly in a commercial-scale process so should not be adopted.…”

“…Silica _ alumina and silica gel are also effective to remove oxidized sulfur compounds from LGO 10) , but the reactivation of adsorbents was not investigated. From the viewpoint of practical and economical use, reactivation and repeated use of adsorbent is quite important.…”

Light FCC gasoline olefin oligomerization over a magnetic NiSo4/γ‐Al2o3 catalyst in a magnetically stabilized bed

“…The traditional process for producing clean diesel fuels is hydrogenation; it is, however, hard for traditional hydrogenation processes to meet all the requirements for high-quality clean diesel fuels. 3 Olefin oligomerization is a promising approach for the production of clean diesel fractions free of sulfur and aromatics. [4][5][6][7] Tabak et al has developed an olefin oligomerization process MOGD, 8,9 which used ZSM-5 zeolites to convert light olefins(C 3 -C 6 ) to gasoline and diesel fuel in fixedbed reactors and found that high-quality diesel was favorably produced at lower temperature (473-573 K) and higher pressure (3.0-10.0 MPa).…”