STUDY ON PERFORMANCE OF MAGNESIUM-PROMOTED HYDROISODEWAXING CATALYST

Abstract

Abstract: Pt/ZSM-23, Pt-Mg/ZSM-23-1% and Pt-Mg/ZSM-23-2% hydroisomerization catalysts were prepared by loading Pt and Mg on H-ZSM-23 molecular sieve by incipient co-impregnation method. The influences of magnesium on the acidity and hydroisomerization of catalysts were studied using hydrocracking tail oil as feed from Huizhou Petrochemical Company. The results showed that the introduction of the magnesium promoter resulted in the decrease of medium-strong acids, while increases their selectivities. The layered Pt/ZSM-23 and Pt-Mg/ZSM-23-2% (volume ratio of 1:1) catalyst system showed a higher yield (from 75.0% to 79.0%) and selectivity at conditions of 325 ℃, hydrogen pressure of 13 MPa, the hydrogen to oil ratio 500 and the LHSV 1.1 h-1. After 1000 h running, the catalyst exhibited a stable hydroisomerization performance. The pour point of 150N base oil is-18 ℃, the yield of 150N and total lube base oil is 48.0% and 79.3% respectively. The results indicate the good hydroisomerization performance and good industrialization prospect.

Key words: molecular sieve, hydroisomerization, hydrocracking tail oil, lube base oil

Zheng Xiuxin Yu Wendong Liu Youpeng Sun Guofang. STUDY ON PERFORMANCE OF MAGNESIUM-PROMOTED HYDROISODEWAXING CATALYST[J]. , 2018, 49(12): 16-21.

References

[1] Yoshimura T，Homoto Y，Yamada Y，et al．Process for producing pentafluoroethane and tetrafluorochloroethane[P]．The United States：6011185，2000-1-4．
[2] 梁君，王福平．烷烃加氢异构化反应[J]．化学进展，2008，20（4）：459-463．
[3] Miller S J．Wax isomerization using catalyst of specific pore geometry[P]．The United States：5246566，1993-9-21．
[4] Biscardi J A，Fong D P，Marcantonio P，et al．Metal loaded microporous material for hydrocarbon isomerization processes[P]．The United States：7390394B2，2008-6-24．
[5] Santilli D S，Zones S I．Process for producing heavy lubricating oil having a low pour point[P]．The United States：5376260，1994-12-17．
[6] Verboekend D，Thomas K，Milina M，et al. Towards more efficient monodimensional zeolite catalysts: n-alkane hydro-isomerisation on hierarchical ZSM-22[J]. Catalysis Science & Technology，2011，1（8）：1331-1335．
[7] Martens J A，Verboekend D，Thomas K，et al．Hydroisomerization of emerging renewable hydrocarbons using hierarchical Pt/H-ZSM-22 catalyst[J]．Chemsuschem Communications，2013，6（3）：421-425．
[8] LEE S，Ihm S．Hydroisomerization and hydrocracking over platinum loaded ZSM-23 catalysts in the presence of sulfur and nitrogen compounds for the dewaxing of diesel fuel[J]．Fuel，2014，134（15）：237-243．
[9] Chi K，Zhao Z，Tian Z，at al．Hydroisomerization performance of platinum supported on ZSM-22/ZSM-23 intergrowth zeolite catalyst [J]．Petroleum Science，2013，10（2）：242-250．
[10] Ramos M J，Gómez J P，Dorado F，et al．Hydroisomerization of a refinery naphtha stream over platinum zeolite-based catalysts[J]．Chemical Engineering Journal，2007，126（1）：13-21．
[11] Lee S，Ihm S．Characteristics of magnesium-promoted Pt/ZSM-23 catalyst for the hydroisomerization of n?hexadecane[J]．Industrial & Engineering Chemistry Research，2013，52（44）：15359-15365．
[12] WANG B，TIAN Z，LI P，et al．A novel approach to synthesize ZSM-23 zeolite involving N,N-dimethylformamide[J]．Microporous and Mesoporous Materials，2010，134（1-3）：203-209．
[13] 孙国方，郑修新，刘有鹏，等．加氢裂化尾油异构脱蜡催化剂研究[J]．石油炼制与化工，2016，47（2）：12-16．
[14] Plank C J，Rosinski E J，Rubin M K．Crystalline zeolite ZSM-23 and synthesis thereof[P]．The United States：4076842，1978-2-28．
[15] 迟克彬，赵震，田志坚，等．正十二烷在Pt/ZSM-22和Pt/ZSM-23上的加氢异构反应性能[J]．化工进展，2012，31（11）：2477-2482，2487．
[16] H?chtl M，Jentys A，Vinek H．Acidity of SAPO and CoAPO molecular sieves and their activity in the hydroisomerization of n-heptane[J]．Microporous and Mesoporous Materials，1999，31（3）：271-285．
[17] 黄卫国，李大东，石亚华，等．分子筛催化剂上正十六烷的临氢异构化反应[J]．催化学报，2003，24（9）：651-657．