Adiponitrile (ADN) is an important organic chemical material with a wide range of uses, and as a raw material to produce nylon-66, the demand is growingg rapidly. Butadiene (BD) hydrocyanation is the most advanced method among the existing production technologies, and the BD hydrocyanation process for ADN production is divided into three stages: the primary hydrocyanation stage, the isomerization stage, and the secondary hydrocyanation stage. In the primary hudrocyanation stage, HCN not only leads to catalyst poisoning, but also easy to polymerize under certain conditions, and leads to clogging of pipelines. Removing HCN first will help to avoid the clogging of pipelines and equipment caused by HCN polymerization. Based on the original process, a stripper was added to recover HCN. Combined with the experimental data of 3-pentenenitrile (3-PN) prepared by BD method, the main reaction kinetic model was deduced to calculate the reactor volume, and the reactor kettle was changed from a single kettle to three kettles in parallel. The simulation software Aspen PlusV 11 was used to simulate the primary hydrocyanide stage process before and after the improvement, respectively, and the NRTL activity coefficient model was selected to calculate the physical property, and the simulation run results were searchable and converged. The results show that the HCN conversion rate of 98% is basically consistent with the actual conversion rate of 98.5%, indicating that the kinetic reactor model is credible. The mass fraction of HCN in the isomerization and secondary hydrocyanation stage is 0, which meets the requirements of the process design, and indicates that it is reasonable to increase the stripper in the original process.
GAOZengchao.Progress of adiponitrile production process by direct cyanidation of butadiene in fine chemicals[J].PetrochemicaTechnology, 2023, 30(5): 202-204. (in Chinese)
DENGDongkui, JIANGYuemin, ZHOUXicai.Technological advances in the production of adiponitrile by direct cyanation of butadiene[J].Technology and Equipment, 2022, 48(5): 62-64. (in Chinese)
LIUQibo, HUOGuangfei, TONGJian, et al. Development of synthesis of adiponitrile and hexanediamine from butadiene[J].Chemical Industry and Engineering Progres, 2009, 28(5): 832-835. (in Chinese)
TUQinghua, GELingsheng. Analysis of the current situation and competitiveness of adiponitrile industry at home and abroad[J]. Chemical Industry, 2023, 41(3): 15-20. (in Chinese)
[11]
XUX F, WANGY F, GUOT, et al. Synthesis of adiponitrile from dimethyl adipate and ammonia in the vapor-phase over niobium oxide[J]. Catalysis Science & Technology, 2022(12): 3947-3956.
[12]
BINIL, MÜLLERC, WILTINGJ, et al.Highly selective hydrocyanation of butadiene toward 3-pentenenitrile[J]. Journal of the American Chemical Society, 2007 (129): 12622-12623.
[13]
BINIL, MÜLLERC. Ligand development in the Ni-catalyzed hydrocyanation of alkenes[J].The Royal Society of Chemistry, 2010(46): 8325-8334.
TAOXumei, CHENGShichao, YEQingguo.Simulation and optimization of process for preparation of adiponitrile from electrolytic dimeric acrylonitrile[J].Modern Chemical Industry, 2011, 31(12): 88-90. (in Chinese)
CHUYang, DUANJihai, LIJianlong.Simulation and optimization of homologous distillation column in adiponitrile production unit[J].Chemical Science and Technology, 2014, 22(2): 5-8. (in Chinese)
[20]
姜野. 己二腈混合物系的汽液相行为研究[D]. 天津: 天津大学, 2021.
[21]
JIANGY, WEIY Y, LIY H, et al. Isobaric vapor-liquid equilibria for the binary system of adiponitrile and cyclopentanone at 5 and 10 kPa[J]. Journal of Chemical and Engineeering Date, 2021, 66(6): 2531-2537.
DONGJ X, SHIY K, HUX J, et al. Nickel()-Catalyzed equilibrium reaction of 3-pentenenitrile[J]. Chinese Journal of Chemistry, 2012, (3): 627-631.
[24]
ZHANGL L, ZHANGY D, ZHUW J, et al.Mechanism and kinetics investigation of reaction network: 1,3-dichloro-2-propanol with alkali to prepare epichlorohydrin[J].AIChE Journal, 2023, 69(12): 18252-18266.
[25]
GOETHLICHA P V, TENSFELDTM, ROTHFUSSH, et al. Novel chelating phosphonite ligands: syntheses, structures, and nickel-catalyzed hydrocyanation of olefins[J].Organometallics2008, 27(10): 2189-2200.
LIHaoran, LIChao, TONGMingquan, et al. Inhibition of ACCP impurity formation in the distillation process of adiponitrile products[J]. Applied Chemistry, 2021, 50: 436-437. (in Chinese)