PETROLEUM PROCESSING AND PETROCHEMICALS

RESEARCH AND APPLICATION OF DEHYDRATION OF FRACTIONATOR OVERHEAD RECYCLE OIL IN RFCC UNIT

Jianxin Liu Junping Lu Xinwei Chang

2008, 39(7): 1-4. doi:

Asbtract ( 2200 )

Related Articles | Metrics

A method of anhydration of fractionator overhead recycle oil was proposed and applied to increase the yield of diesel oil based on the analysis of problems existed in FCC unit for increasing diesel fraction yield. The application results showed that the salt deposition in the main fractionation column was solved, the top temperature of the main fractionation column could be controlled to 93.3℃, and the dry point of gasoline fraction and the initial boiling point of diesel fraction were dropped to 160.5 ℃ and 146.0 ℃, respectively. Besides increase the yield of diesel oil the energy consumption of the unit was reduced, an economic benefit of 46.26 MRMB was obtained annually.

STUDY ON OXIDATION - EXTRACTION DESULFURIZATION OF STRAIGHT-RUN DIESEL BY PHASE TRANSFER CATALYSIS

SHE Lin-Yuan

2008, 39(7): 5-9. doi:

Asbtract ( 2610 )

Related Articles | Metrics

The desulfurization of straight-run diesel fuel was carried out in a hydroperoxide-formic acid catalytic oxidation system using tetrabutylammonium bromide (TBAB) as phase transfer catalyst, and later the oxidized organic sulfur compounds were separated by N,N-Dimethylformamide (DMF) extraction. The influences of the amount of TBAB, reaction temperature, reaction time, dosages of hydroperoxide and formic acid, the volume ratio of solvent-to-oil and mixing speed on the desulfurization of straight-run diesel fuel were investigated. The optimum operation conditions were obtained as follows: a TBAB content of 0.1%, a reaction temperature of 60℃, a reaction time of 2 h, a volume ratio of hydroperoxide-to-diesel of 0.1, a volume ratio of hydroperoxide-to-formic acid of 0.5, a volume ratio of extractant to diesel of 0.4 and a mixing speed of 150 r·min-1. Under such conditions the removal rate of sulfur and the recovered yield of diesel oil were 82.03% and 92.02%, respectively. The results of kinetics study by model fuel showed that the reaction of thiophene removal by H2O2-HCOOH phase transfer catalytic oxidation system was a pseudo first-order reaction with an activation energy of 7.47 kJ·mol-1.

PROCESS OPTIMIZATION AND REVAMPING OF A REFINING WASTEWATER TREATING PLANT

2008, 39(7): 10-13. doi:

Asbtract ( 1780 )

Related Articles | Metrics

The revamping and operation of the wastewater treating plant of Liaohe Petrochemical Company was briefly introduced. The revamping project mainly included setting up heavy oil waste pre-treating facilities, bar screen well and buffer tank to control the quality and quantity of upstream discharge; selecting high-efficiency dissolved-air flotation way to reinforce primary treatment; optimizing the biological treatment to ensure the discharge of secondary wastewater meeting requirements. After revamping the quality of the discharge wastewater reached the National Standard GB 8978-1996 and a construction investment of 40 MRMB was saved.

THE APPLICATION OF LO-CAT PROCESS IN THE DESULPHURIZATION SYSTEM OF REFINERY

HU Yaoliang

2008, 39(7): 14-20. doi:

Asbtract ( 2159 )

Related Articles | Metrics

The applications of LO-CAT process in the H2S removal of gases, such as fuel gas, acid gas of amine unit, stripped gas of wastewater treatment plant and tail gas of Claus unit, were introduced. The industrial application results showed that the H2S removal rate of LO-CAT process was more than 99.9%, the operation was under ambient temperature and atmospheric pressure with high flexibility, e.g. the H2S content in feed could be varied in the range of 0~100%, the equipment performance was reliable and without pollution generated during the process. This technology may have a promising application prospect in domestic refineries, esp. for medium and small size refineries.

SOLUTIONS FOR PREVENTING CONGEALMENT HAPPENED AT THE AIR-COOLER OF CONTACT COOLING TOWER IN DELAYED COKING UNIT

2008, 39(7): 21-23. doi:

Asbtract ( 4341 )

Related Articles | Metrics

Congealment sometimes happened at the air cooler of the contact cooling tower in delayed coking unit of Karamay Petrochemical Company. In order to solve this problem, measures such as optimizing process conditions, adjusting the turning of air-cooler, adding frequency adjuster to the air-cooler and changing the feeding mode, were adopted. Since then the unit was running stably and the consumption of steam and electricity was reduced.

APPLICATION OF MIP TECHNOLOGY IN JINXI PETROCHEMICAL COMPANY

Yuhua Wang

2008, 39(7): 24-29. doi:

Asbtract ( 2067 )

Related Articles | Metrics

Revamping with MIP technology, the capacity of the RFCCU in Jinxi Petrochemical Company was expanded from 1 400 kt/a to 1 867 kt/a, and reached 1 932 kt/a in maximum. The performance test results showed that the ratios of VR and CGO in the mixed feedstock could be increased to 28.5w% and 25.3w%, respectively, so that extra 400 kt of heavy oil could be processed per year. The olefin content in the cracked naphtha was reduced by 13.4 percentage points due to the effective olefin reduction function of MIP technology. The product slates well met the design target, and the total liquid yield (73.46%) was 2.96 percentage points higher than the design value. A 17.19 million RMB economic benefit was obtained annually.

Regeneration of A Deactivated Solid Acid Alkylation Catalyst Using Supercritical Isobutane Fluid

Yigong He

2008, 39(7): 30-35. doi:

Asbtract ( 2028 )

Related Articles | Metrics

The isobutane/butene alkylation reactions over a solid acid catalyst were carried out under liquid phase and supercritical conditions respectively. Supercritical isobutane fluid regeneration was adopted to recover the activity of partial deactivated catalysts. The influences, such as the composition and phase of the reactivation fluid, regeneration temperature, pressure, fluid space velocity and treating time, on the regeneration were investigated. Results showed that supercritical fluid regeneration was a promising reactivation method for deactivated solid acid alkylation catalyst. For catalyst partially deactivated under liquid phase reaction conditions, when it was regenerated at 180℃, its activity of butene conversion could be totally recovered, and its C8o selectivity could reached 92.8% of that of the fresh catalyst; for catalyst deactivated under supercritical conditions, its C8o selectivity could be recovered to 82.4% of that of the fresh catalyst.

PERFORMANCE OF COMMERCIAL RUNNING PS-VI CONTINUOUS REFORMING CATALYST

2008, 39(7): 36-40. doi:

Asbtract ( 2288 )

Related Articles | Metrics

PS-VI catalyst developed by Research Institute of Petroleum Processing was used in the 800 kt/a continuous catalyst regeneration reforming unit of Zhenhai Refining and Chemical Company. The commercial running results showed that PS-VI catalyst exhibited high resistant against attrition, good hydrothermal stability and chloride retention ability. As compared with the base catalyst, using PS-VI catalyst at the initial stage the yields of aromatics, reformate and hydrogen increased 6.46, 1.32 and 0.35 percentage points, respectively; the coke rate reduced more than 26%. As compared with the catalyst at the initial stage, at the end stage (after running 1 918 days) the catalyst activity slightly decreased due to the increase of impurities, the reformate yield dropped 1.28 percentage points.

Catalytic Performance of CrOx/SiO2 Catalyst for Catalytic Dehydrogenation of n-butane

XU Yue-Bing Ying-Lu LU

2008, 39(7): 41-46. doi:

Asbtract ( 2126 )

Related Articles | Metrics

A series of CrOx/SiO2 catalyst samples with various CrOx loadings for catalytic dehydrogenation of n-butane were prepared by incipient wetness impregnation method. The catalyst samples were characterized by XRD, FT-IR and UV-Vis techniques. It was found that the chromium on the silica surface existed in the form of Cr(III) and Cr(VI) species. The test results showed that with a catalyst having a CrOx loading of 12%, under the optimum reaction conditions of a reaction temperature of 590 ℃, mole ratios of H2 to n-C4H10 of 1.5~2.5, and a WHSV between 1~2 h-1, relatively high n-butane conversion and n-butene selectivity could be obtained. The ratio of 2-butene to 1-butene in the product was mainly influenced by the reaction temperature, the CrOx loading, ratio of hydrogen to n-butane and the WHSV had no significant influence.

INFLUENCE OF PREPARATION METHOD ON ZrO2/SiO2-Al2O3 COMPLEX SUPPORT

2008, 39(7): 47-49. doi:

Asbtract ( 2064 )

Related Articles | Metrics

ZrO2/SiO2-Al2O3 complex support was prepared by co-precipitation and extrusion respectively, and it was characterized by means of BET, XRD, XPS and NH3-TPD techniques. Test results showed that preparation method had significant influence on the structure and property of the complex support. When ZrO2 was added into the complex support by co-precipitation method, it was propitious to the dispersion of SiO2 on the surface of the complex support and in favor of reducing the binding force between metals and support, thus the prepared catalyst exhibited enhanced hydrogenation activity.

UPGRADING OF 6# SOLVENT OIL BY CATALYTIC ALKYLATION USING IONIC LIQUIDS CATALYST

Sun Xue-Wen Suo-Qi ZHAO

2008, 39(7): 50-53. doi:

Asbtract ( 1943 )

Related Articles | Metrics

Study on the removal of aromatics, olefins, and sulfur compounds by catalytic alkylation was carried out on a continuous apparatus using ionic liquids as catalyst and 6# extraction solvent oil from Daqing Linyuan Refinery as feedstock. The test results showed that when using CuCl modified complex ionic liquids as catalyst, the aromatics, olefins and sulfur compounds in the solvent oil could be well removed simultaneously, the quality of the treated 6# solvent oil met the requirements of National Standard GB 16629-1996.

Tribological Properties of Nanometer Borate In Aqueous Solution

2008, 39(7): 54-59. doi:

Asbtract ( 2286 )

Related Articles | Metrics

Using nano-particles as additive of aqueous solution is a new way to develop additives with high efficiency and without pollution. Six kinds of borate nano-particles were prepared by direct precipitation method, and the structure of the prepared samples were characterized by means of TEM. The tribological properties of the prepared borate nano-particles as aqueous solution additives were measured by four-ball tester. Results indicated that load-carrying capacity of water could be effectively improved when borate nanoparticles were added, as well as antiwear and friction reduction properties, and the preferable adding dosages were 1% or 1.5%. XPS analysis of the wear scar showed that tribo-chemical reaction might happen and a complex film containing some oxides was formed on the rubbing surface, which provided aqueous solution with good friction reduction and antiwear properties.

SUMMARY OF TECHNOLOGY APPLICATION FOR WATER SAVING AND MINIMIZING WASTEWATER DISCHARGE IN REFINING ENTERPRISES

2008, 39(7): 59-63. doi:

Asbtract ( 2076 )

Related Articles | Metrics

Technologies of water saving and reducing wastewater effluent and their applications in refineries are summarized, major issues in water saving and reducing wastewater effluent are discussed, and some suggestions for further improvement are proposed, such as analyzing the current situation of water consumption and wastewater discharge in the refinery to set up a plan of water saving and minimizing wastewater discharge; optimizing the water network and developing new technologies in this area for less investment and more profitability.

CURRENT TREND OF OIL VAPOR RECOVERY TECHNOLOGIES FOR OIL PRODUCTS STORAGE AND DISTRIBUTION

2008, 39(7): 64-70. doi:

Asbtract ( 2356 )

Related Articles | Metrics

When comparing and selecting different technologies for oil vapor recovery applications, cost is usually the most critical parameter if all candidates can meet the emission requirement. This article compares different adsorption based oil vapor recovery schemes, and concludes that the adsorption/absorption combination scheme is still the mainstream worldwide. The variations of this scheme, such as the adsorption/refrigeration combination, the absorption/membrane separation/adsorption combination, are only used under some special scenarios. Due to its relatively simple procedure and less space requirements, the combined adsorption/absorption scheme with dry screw vacuum pump will gradually replace the widely used combined adsorption/absorption scheme with liquid ring vacuum pump. Thus, fundamental research in this area is recommended for domestic institutions having interests in the oil vapor recovery market.

Table of Content