After two decades’ endeavor, the Research Institute of Petroleum Processing (RIPP) has successfully developed a green caprolactam (CPL) production technology. This technology is based on the integration of titanium silicate (TS)-1 zeolite with the slurry-bed reactor for the ammoximation of cyclohexanone, the integration of silicalite-1 zeolite with the moving-bed reactor for the gas-phase rearrangement of cyclohexanone oxime, and the integration of an amorphous nickel (Ni) catalyst with the magnetically stabilized bed reactor for the purification of caprolactam. The world’s first industrial plant based on this green CPL production technology has been built and possesses a capacity of 200 kt·a
−1
. Compared with existing technologies, the plant investment is pronouncedly reduced, and the nitrogen (N) atom utilization is drastically improved. The waste emission is reduced significantly; for example, no ammonium sulfate byproduct is produced. As a result, the price difference between CPL and benzene drops. In 2015, the capacity of the green CPL production technology reached 3 × 10
6
t·a
−1
, making China the world’s largest CPL producer, with a global market share exceeding 50%.
Meng X, Mu X, Zong B, Min E, Zhu Z, Fu S, et al.. Purification of caprolactam in magnetically stabilized bed reactor. Catal Today 2003;79–80:21–7. doi:10.1016/S0920-5861(03)00038-5.
CrossRef
Xu K, Sun B, Lin J, Wen W, Pei Y, Yan S, et al.. e-Iron carbide as a low-temperature Fischer-Tropsch synthesis catalyst. Nat Commun 2014;5:5783. PMID:25503569 doi:10.1038/ncomms6783
CrossRef
Zong B. Amorphous Ni alloy hydrogenation catalyst and magnetically stabilized bed reaction technology. Catal Surv Asia 2007;11(1):87–94.
CrossRef
Pei Y, Zhou G, Luan N, Zong B, Qiao M, Tao F. Synthesis and catalysis of chemically reduced metal-metalloid amorphous alloys. Chem Soc Rev 2012;41(24):8140–62. PMID:22907172 doi:10.1039/c2cs35182j
CrossRef
Zong B, Mu X, Zhang X, Meng X, Qiao M. Research, development, and application of amorphous nickel alloy catalysts prepared by melt-quenching. Chinese J Catal 2013;34(5):828–37. doi:10.1016/S1872-2067(11)60486-5.
CrossRef
Zhou G, Pei Y, Jiang Z, Fan K, Qiao M, Sun B, et al.. Doping effects of B in ZrO2 on structural and catalytic properties of Ru/B-ZrO2 catalysts for benzene partial hydrogenation. J Catal 2014;311:393–403. doi:10.1016/j.jcat.2013.12.022.
CrossRef
Zong B, Zhang X, Qiao M. Integration of methanation into the hydrogenation process of benzoic acid. AIChE J 2009;55(1):192–7. doi:10.1002/aic.11679.
CrossRef
Zhu L, Guo P, Chu X, Yan S, Qiao M, Fan K, et al.. An environmentally benign and catalytically efficient non-pyrophoric Ni catalyst for aqueous-phase reforming of ethylene glycol. Green Chem 2008;10(12):1323–30. doi:10.1039/b808190e.
CrossRef
Hu J, Fan Y, Pei Y, Qiao M, Fan K, Zhang X, et al.. Shape effect of ZnO crystals as cocatalyst in combined reforming-hydrogenolysis of glycerol. ACS Catal 2013;3(10):2280–7. doi:10.1021/cs400526s.
CrossRef
Zong B, Meng X, Mu X, Zhang X. Magnetically stabilized bed reactors. Chinese J Catal 2013;34(1):61–8.
CrossRef
Fan J, Zong B, Zhang X, Meng X, Mu X, Yu G, et al.. Rapidly quenched skeletal Fe-based catalysts for Fischer-Tropsch synthesis. Ind Eng Chem Res 2008;47(16):5918–23.
CrossRef
Yu G, Sun B, Pei Y, Xie S, Yan S, Qiao M, et al.. FexOy@C spheres as an excellent catalyst for Fischer-Tropsch synthesis. J Am Chem Soc 2010;132(3):935–7. PMID:20028126.
CrossRef
Sun B, Yu G, Lin J, Xu K, Pei Y, Yan S, et al.. A highly selective Raney Fe@HZSM-5 Fischer-Tropsch synthesis catalyst for gasoline production: One-pot synthesis and unexpected effect of zeolites. Catal Sci Technol 2012;2:1625–9.
CrossRef
Sun B, Jiang Z, Fang D, Xu K, Pei Y, Yan S, et al.. One-pot approach to a highly robust iron oxide/reduced graphene oxide nanocatalyst for Fischer-Tropsch synthesis. ChemCatChem 2013;5(3):714–9. doi:10.1002/cctc.201200653.
CrossRef
Sun B, Lin J, Xu K, Pei Y, Yan S, Qiao M, et al.. Fischer-Tropsch synthesis over skeletal Fe-Ce catalysts leached from rapidly quenched ternary Fe-Ce-Al alloys. ChemCatChem 2013;5(12):3857–65. doi:10.1002/cctc.201300430.
CrossRef
Cheng Y, Lin J, Xu K, Wang H, Yao X, Pei Y, et al.. Fischer-Tropsch synthesis to lower olefins over potassium-promoted reduced graphene oxide supported iron catalysts. ASC Catal 2016;6(1):389–99.
CrossRef
Xu K, Cheng Y, Lin J, Wang H, Xie S, Pei Y, et al.. Nanocrystalline iron-boron catalysts for low-temperature CO hydrogenation: Selective liquid fuel production and structure-activity correlation. J Catal 2016;339:102–10. doi:10.1016/j.jcat.2016.03.035.
CrossRef
Pan Z, Dong M, Meng X, Zhang X, Mu X, Zong B. Integration of magnetically stabilized bed and amorphous Nickel alloy catalyst for CO methanation. Chem Eng Sci 2007;62(10):2712–7. doi:10.1016/j.ces.2007.02.007.
CrossRef
Dong M, Pan Z, Peng Y, Meng X, Mu X, Zong B, et al.. Selective acetylene hydrogenation over core-shell magnetic Pd-supported catalysts in a magnetically stabilized bed. AIChE J 2008;54(5):1358–64.
CrossRef
Peng Y, Dong M, Meng X, Zong B, Zhang J. Light FCC gasoline olefin oligomerization over a magnetic NiSO4/γ-Al2O3 catalyst in a magnetically stabilized bed. AIChE J 2009;55(3):717–25.
CrossRef
Cheng M, Xie W, Zong B, Sun B, Qiao M. When magnetic catalyst meets magnetic reactor: Etherification of FCC light gasoline as an example. Sci Rep 2013;3:1973. PMID:23756855.
CrossRef
