共查询到19条相似文献,搜索用时 109 毫秒
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由于乙烯装置汽油分馏塔(DA101)发生上部填料堵塞,裂解汽油干点升高,重质组分随工艺过程带到分离系统,导致丙烯产品中轻组分超标、碳四产品中碳三超标,碳五产品中碳四含量高、碳九碳十产品颜色加深等一系列的工艺和质量问题。为保证装置安全平稳运行到预定检修日期,采取了一系列措施来保证装置安全生产。 相似文献
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碳四烯烃歧化制丙烯技术 总被引:7,自引:0,他引:7
利用烯烃歧化技术制备丙烯是实现剩余碳四烯烃综合利用以及增产丙烯的有效途径。综述了国内外一些主要研究机构利用碳四烯烃歧化生产丙烯工艺的研究进展:美国Phillips(Lummus)公司工艺比较成熟,现已有工业化装置采用;法国Insti tutFrancaisduPetrole工艺可在低温下进行,但原料对杂质敏感,处于中试阶段;德国BASF工艺无须外加乙烯;南非Sasol公司工艺适合F-T反应产物的歧化,可以与合成油装置实现对接;UOP工艺将甲醇制烯烃技术与碳四烯烃歧化技术相结合,具有相当的经济优势,并即将工业化;而美国ARCO(Lyondell)公司工艺和中国科学院大连化学物理研究所开发的工艺仍处于实验室探索阶段。指出我国解决碳四馏分出路的重要途径就是采用歧化技术生产低碳烯烃,尤其是丙烯、己烯,以进一步提高企业经济效益。 相似文献
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关于开发碳四、碳五馏分生产丙烯技术方案的探讨 总被引:8,自引:0,他引:8
利用蒸汽裂解和炼油工艺的碳四和碳五馏分生产丙烯是增产丙烯的一条重要途径。介绍了国外几种主要的技术以及我国在此领域研究的最新成果。认为在原来以重质石油组分生产轻烯烃的基础上,可以开发出我国自己的技术。 相似文献
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介绍了中韩石化碳五分离装置的工艺特点,从生产准备、阻聚剂使用、工艺操作优化、日常管理等方面分析和探讨了碳五分离装置长周期运行需要注意的几个方面。 相似文献
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1 丙炔、丙二烯的脱除方法 石油烃裂解分离得到的碳三馏分中通常含有丙炔(又称甲基乙炔,英文缩写MA)和丙二烯(PD)1.0~3.5mol%。若采用毫秒炉高温超短停留裂解工艺,NA、PD的含量甚 相似文献
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介绍了催化脱氢-烷烯分离工艺、SHOP法生产α-烯烃的副产物、低碳烯烃齐聚等多种获取高碳内烯烃的途径。简析了国内外高碳内烯烃用于合成聚内烯烃(PIO)、与α-烯烃共齐聚生产聚烯烃润滑油的现状。由内烯烃齐聚而成的PIO结构与聚α-烯烃(PAO)类似,具有PAO的基本特性,即高粘度指数、低倾点、良好的热安定性及氧化安定性。目前,已在空气压缩机油、发动机油等领域得到应用。高碳内烯烃与α-烯烃(尤其是不适合生产PAO的α-烯烃)共齐聚(混合比依据内烯烃和α-烯烃的碳数、组成选定),可使齐聚产物的低温流动性能得到显著改善。高碳内烯烃来源广泛且在工业上的重要性不如α-烯烃,因而高碳内烯烃用于合成聚烯烃润滑油具有成本优势。 相似文献
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Zhenming Zhang He Zhao Xiaohui Wang Weiming Ni Fengsheng Gao Jianrong Wang Minjin Liu Yongli Li 《中国化学工程学报》2021,33(5):112-117
The microreactor based hydroxylation process of 1,2,4-trichlorobezene for producing 2,5-dichlorphenol, the key intermediate of dicamba, is energy efficient and cost effective. But the 2,5-dicholorphneol is pre-sent in a mixed state after production. The reaction mixture contained the main by-product 2,4-dichlorophneol, low-content by-product 3,4-dichlorophneol, and other impurities. The difficulty in sep-aration and analysis limits the application of this process widely. The current work aimed at establishing effective analysis methods by gas chromatography (GC) and high performance liquid chromatography (HPLC). The GC method was not able to separate 2,5-dichlorophenol and 2,4-dichlorophenol completely, but the developed HPLC method worked efficiently. The linear correlation coefficients of 2,5-dichlorophenol and 2,4-dichlorophenol were both higher than 0.999, and the average recovery was 100.33% for 2,5-dichlorophenol and 100.13% for 2,4-dichlorophenol, respectively. The relative standard deviations from precision tests were both less than 1%. The contents of 2,5-dichlorophenol and 2,4-dichlorophenol were determined with external standard method. The HPLC method has the advantages of simple operation, good separation efficiency, high accuracy and precision, and was successfully applied for both qualitative and quantitative analysis of 2,5-dichlorophenol and 2,4-dichlorophenol of the sample solution. 相似文献
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二甲醚作为燃料的替代品,其生产开发在化学工程领域受到了广泛关注。本文对合成气一步法制备二甲醚过程进行了模拟分析,提出了用水作为吸收剂并采用多效精馏的二甲醚生产新工艺。利用Aspen Plus化工模拟软件对吸收塔进行模拟比较了甲醇和水作为吸收剂的能耗,模拟结果表明,用水吸收较甲醇吸收总热负荷降低23.54%,总冷负荷降低35.97%,更为节能。从节能降耗角度出发,根据不同的分离任务,提出了采用两塔分离甲醇-水及三塔分离甲醇-水的两项工艺改进措施。结果表明,采用两塔分离甲醇-水工艺比原工艺二甲醚产量增加了11.50%,能量消耗无明显变化。进一步采用三塔精馏工艺总冷负荷比原工艺减少45.07%,总热负荷减少19.27%,且二甲醚产量增加11.15%,节能效果显著。 相似文献
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The reaction of several dimethyl phenols with formaldehyde in alkaline medium was investigated. The addition products were separated by means of high pressure liquid chromatography and identified using IR and NMR spectroscopy. 2,3-dimethyl phenol yields four, 2,4-dimethyl phenol one, 2,5-dimethyl phenol four, 2,6-dimethyl phenol one, 3,4-dimethyl phenol three, and 3,5-dimethyl phenol five addition products. 3,5-dimethyl phenol was the most reactive, 2,6-dimethyl and 2,4-dimethyl phenols the least reactive species. Rate constants for individual reactions were obtained from the dependence of concentrations on the reaction time. 相似文献
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Bi2O3 and mixtures with different additives (Cr2O3, MoO3, NH4VO3, SnO2, and V2O5) have been chosen to study the oxidative dehydrodimerization of isobutene. The catalytic performances were investigated by variation of the residence time, isobutene to oxygen molar ratio, and pressure. The best results for 2,5‐dimethyl‐1,5‐hexadiene (DMH) yield (13 %) were achieved with Bi2O3 as the catalyst. The selectivity of DMH reaches values of over 90 %. 相似文献
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在脱除游离甲苯二异氰酸酯(F-TDI)的共沸蒸馏研究中,缺少2,4-TDI与共沸剂的二元体系汽液平衡数据及基础热力学参数。采用自制的汽液平衡釜,测定了0.55 kPa压力下,2,4-TDI/苯甲酸乙酯、2,4-TDI/丁二酸二乙酯、2,4-TDI/己二酸二甲酯三组二元体系的汽液平衡数据,所得数据通过了热力学一致性面积检验。借助流程模拟软件Aspen Plus对实验数据进行了回归,得到3组UNIQUAC模型参数及关联偏差,气相摩尔分数平均偏差分别为0.0067、0.0083和0.0179,平衡温度平均绝对偏差分别为0.7 K、1.2 K和0.5 K。进而对共沸体系进行了共沸分析,得到了共沸组成和共沸条件,为F-TDI的共沸分离技术提供了工艺参数。 相似文献