利用隔壁精馏塔替代混合碳五馏分原有分离流程中的脱丁烷塔和碳五预分离塔,通过Aspen Plus V12软件对混合碳五馏分的提纯流程进行稳态模拟,在此基础上运用灵敏度分析工具,对隔壁精馏塔的操作参数进行优化。结果表明:采用隔壁精馏塔替代...利用隔壁精馏塔替代混合碳五馏分原有分离流程中的脱丁烷塔和碳五预分离塔,通过Aspen Plus V12软件对混合碳五馏分的提纯流程进行稳态模拟,在此基础上运用灵敏度分析工具,对隔壁精馏塔的操作参数进行优化。结果表明:采用隔壁精馏塔替代脱丁烷塔和碳五预分离塔,最佳原料进料位置为第11块塔板、最佳质量回流比为5、最佳侧线采出位置为第7块塔板、最佳侧线采出量为500 kg h,气相回流位置为第37块塔板,液相回流位置为第12块塔板;在相同进料条件和相同碳五馏分纯度的前提下,与采用常规精馏工艺相比,采用隔壁塔精馏工艺时冷却能耗降低17.04%,加热能耗降低16.69%。展开更多
采用改进的共沉淀法制备出新一代铁系尖晶石丁烯氧化脱氢制丁二烯催化剂,并以混合C4馏分或正丁烯为原料,在200 m L固定床反应装置上,考察了主要工艺条件对所制备催化剂催化性能的影响。结果表明,在水/丁烯摩尔比为12~17,O2/丁烯摩尔比为...采用改进的共沉淀法制备出新一代铁系尖晶石丁烯氧化脱氢制丁二烯催化剂,并以混合C4馏分或正丁烯为原料,在200 m L固定床反应装置上,考察了主要工艺条件对所制备催化剂催化性能的影响。结果表明,在水/丁烯摩尔比为12~17,O2/丁烯摩尔比为0.65~0.73,反应温度为380~400℃,丁烯体积空速为400 h-1的适宜工艺条件下,丁烯转化率高于82%,丁二烯选择性高于90%,其催化性能优于原铁系工业化催化剂W-201。展开更多
In many chemical processes, large amounts of wastewater containing butanol and isobutanol are produced.Given that n-butanol-isobutanol-water can form triple azeotrope, high-purity butanol cannot be recovered from the ...In many chemical processes, large amounts of wastewater containing butanol and isobutanol are produced.Given that n-butanol-isobutanol-water can form triple azeotrope, high-purity butanol cannot be recovered from the wastewater by ordinary distillation. To economically and effectively recover butanol from this kind of wastewater, 1,4-butanediol is selected as an extractant to break the formation of the azeotropes, and a doubleeffect extractive distillation process is proposed. The conceptual design of the proposed process is accomplished based on process simulation. With the proposed process, the purity of recovered butanol and water is greater than 99.99 wt%. In comparison with the conventional azeotropic distillation process, economic analysis shows that the operating cost of the proposed process is lower: when the capacity of wastewater treatment is 100 t·h^(-1), the total operating cost decreases by 5.385 ×10~6 USD per year, and the total annual cost of the new process decreases by 5.249 ×10~6 USD per year. In addition, in the extractive distillation system, variable effects on separation purities and cost are more complex than those in the ordinary distillation system. The method and steps to optimize the key variables of the extractive distillation system are also discussed in this paper and can provide reference for similar studies.展开更多
In this work, the extractive distillation with heat integration process is extended to separate the pressure-insensitive benzene-cyclohexane azeotrope by using furfural as the entrainer. The optimal design of extracti...In this work, the extractive distillation with heat integration process is extended to separate the pressure-insensitive benzene-cyclohexane azeotrope by using furfural as the entrainer. The optimal design of extractive distillation process is established to achieve minimum energy requirement using the multi-objective genetic algorithm, and the results show that energy saving for this heat integration process is 15.7%. Finally, the control design is performed to investigate the system's dynamic performance, and three control structures are studied. The pressure-compensated temperature control scheme is proposed based on the first two control structures, and the dynamic responses reveal that the feed disturbances in both flow rate and benzene composition can be mitigated well.展开更多
Both distillation performance and hydrodynamic study for backmixing by tracer technique were carried out in a high-pressure packed column with 0.15 m inner diameter over a wide range of operating conditions. Isobutane...Both distillation performance and hydrodynamic study for backmixing by tracer technique were carried out in a high-pressure packed column with 0.15 m inner diameter over a wide range of operating conditions. Isobutane and n-pentane are employed as test mixture in the distillation experiment and air/water is used for the hydrodynamic study. The column is installed with Mellapak 350Y structured packing and the total packing height is 2.0 m. With the increasing operating pressure, the separation efficiency increases slightly while the F-factor corresponding to the maximum efficiency at each pressure is descending. It is noted that, at all operating pressures, with the increase of F-factor, the packing efficiency is slightly higher up to the flooding point. The application of SRP model to high-pressure distillation gives much lower values of HTUOG than those obtained experimentally. An additional term, the height of mixing unit, is introduced to correct the SRP model and improve its accuracy at high pressure. From the tracer experiments, the height of mixing unit for gas phase was found to be larger than that for the liquid phase. From this viewpoint, it is believed that the gas phase backmixing gives more unfavorable influence on the separation efficiency in comparison with liquid phase.展开更多
文摘利用隔壁精馏塔替代混合碳五馏分原有分离流程中的脱丁烷塔和碳五预分离塔,通过Aspen Plus V12软件对混合碳五馏分的提纯流程进行稳态模拟,在此基础上运用灵敏度分析工具,对隔壁精馏塔的操作参数进行优化。结果表明:采用隔壁精馏塔替代脱丁烷塔和碳五预分离塔,最佳原料进料位置为第11块塔板、最佳质量回流比为5、最佳侧线采出位置为第7块塔板、最佳侧线采出量为500 kg h,气相回流位置为第37块塔板,液相回流位置为第12块塔板;在相同进料条件和相同碳五馏分纯度的前提下,与采用常规精馏工艺相比,采用隔壁塔精馏工艺时冷却能耗降低17.04%,加热能耗降低16.69%。
文摘采用改进的共沉淀法制备出新一代铁系尖晶石丁烯氧化脱氢制丁二烯催化剂,并以混合C4馏分或正丁烯为原料,在200 m L固定床反应装置上,考察了主要工艺条件对所制备催化剂催化性能的影响。结果表明,在水/丁烯摩尔比为12~17,O2/丁烯摩尔比为0.65~0.73,反应温度为380~400℃,丁烯体积空速为400 h-1的适宜工艺条件下,丁烯转化率高于82%,丁二烯选择性高于90%,其催化性能优于原铁系工业化催化剂W-201。
基金Supported by the National Key Technology Support Program of China(2014BAC10B01)the National Natural Science Foundation of China(21406123)the Key Scientific and Technological Project of Shanxi Province(MH2014-10)
文摘In many chemical processes, large amounts of wastewater containing butanol and isobutanol are produced.Given that n-butanol-isobutanol-water can form triple azeotrope, high-purity butanol cannot be recovered from the wastewater by ordinary distillation. To economically and effectively recover butanol from this kind of wastewater, 1,4-butanediol is selected as an extractant to break the formation of the azeotropes, and a doubleeffect extractive distillation process is proposed. The conceptual design of the proposed process is accomplished based on process simulation. With the proposed process, the purity of recovered butanol and water is greater than 99.99 wt%. In comparison with the conventional azeotropic distillation process, economic analysis shows that the operating cost of the proposed process is lower: when the capacity of wastewater treatment is 100 t·h^(-1), the total operating cost decreases by 5.385 ×10~6 USD per year, and the total annual cost of the new process decreases by 5.249 ×10~6 USD per year. In addition, in the extractive distillation system, variable effects on separation purities and cost are more complex than those in the ordinary distillation system. The method and steps to optimize the key variables of the extractive distillation system are also discussed in this paper and can provide reference for similar studies.
基金supported by the National Natural Science Foundation of China(grant number 21476261)the Key Research and Development Plan Project of Shandong Province(grant number 2015GGX107004)
文摘In this work, the extractive distillation with heat integration process is extended to separate the pressure-insensitive benzene-cyclohexane azeotrope by using furfural as the entrainer. The optimal design of extractive distillation process is established to achieve minimum energy requirement using the multi-objective genetic algorithm, and the results show that energy saving for this heat integration process is 15.7%. Finally, the control design is performed to investigate the system's dynamic performance, and three control structures are studied. The pressure-compensated temperature control scheme is proposed based on the first two control structures, and the dynamic responses reveal that the feed disturbances in both flow rate and benzene composition can be mitigated well.
基金the National Natural Science Foundation of China (No. 20136010).
文摘Both distillation performance and hydrodynamic study for backmixing by tracer technique were carried out in a high-pressure packed column with 0.15 m inner diameter over a wide range of operating conditions. Isobutane and n-pentane are employed as test mixture in the distillation experiment and air/water is used for the hydrodynamic study. The column is installed with Mellapak 350Y structured packing and the total packing height is 2.0 m. With the increasing operating pressure, the separation efficiency increases slightly while the F-factor corresponding to the maximum efficiency at each pressure is descending. It is noted that, at all operating pressures, with the increase of F-factor, the packing efficiency is slightly higher up to the flooding point. The application of SRP model to high-pressure distillation gives much lower values of HTUOG than those obtained experimentally. An additional term, the height of mixing unit, is introduced to correct the SRP model and improve its accuracy at high pressure. From the tracer experiments, the height of mixing unit for gas phase was found to be larger than that for the liquid phase. From this viewpoint, it is believed that the gas phase backmixing gives more unfavorable influence on the separation efficiency in comparison with liquid phase.
