共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
3.
介绍煤化工领域甲醇制烯烃(MTO)和甲醇制丙烯(MTP)两条工艺路线,分别对两条路线进行产品市场分析、工艺技术分析和路线竞争力分析,提出对中国发展MTO和MTP的看法。 相似文献
4.
5.
甲醇制丙烯工艺催化剂的汽蒸过程分析 总被引:1,自引:0,他引:1
甲醇制丙烯工艺采用ZSM-5型催化剂,为优化其丙烯选择性,在使用之前需要进行汽蒸。介绍了系统的氮气预热流程和工艺蒸汽预热流程;从工艺过程出发,简述了催化剂的汽蒸操作过程。 相似文献
6.
7.
丙烯制冷系统是煤制甲醇工艺的重要工段.本文介绍了我公司丙烯制冷系统原始试车过程,针对试车时出现的压缩机喘振,管道液击,无法降温等问题,进行了深入的分析研究,制定了详细的改造方案,通过改造最终消除了系统的故障,实现了长周期的稳定运行. 相似文献
8.
9.
10.
徐兆瑜 《精细化工原料及中间体》2014,(9)
文章介绍了近年来国内外基于煤经甲醇制烯烃的工艺技术路线,主要是煤制乙烯、丙烯工艺。对原料状况、国内需求和生产、市场前景,以及煤基烯烃工艺催化剂研究和技术经济等进行了简单论述。我国发展煤基烯烃具有坚实的基础,同时也呈现出了很好的经济和社会效益。 相似文献
11.
12.
采用Aspen Plus化工模拟软件10.0版本对顺酐吸收塔的吸收过程进行了模拟计算,考察了反应气进料温度、反应气中顺酐含量、循环吸收剂用量和循环吸收剂中水含量变化对塔顶尾气中顺酐含量和塔釜富顺酐吸收剂中水含量的影响规律。模拟计算结果和装置运行数据对比表明,在相同条件下,模拟值与装置运行值误差小于1%,说明该模拟方法可靠。为确保塔顶尾气中顺酐含量不高于0.02%(质量分数,下同),塔釜富顺酐吸收剂中水含量不高于0.2%,同时降低后续装置操作负荷,模拟优化分析得到吸收塔适宜的工艺参数:反应气的进料温度为108℃,反应气中顺酐含量为2.36%,循环吸收剂的用量为反应气中顺酐质量的3.12倍。 相似文献
13.
为提高工业上火电厂乙醇胺(MEA)吸收塔脱碳工艺中脱碳率和反应速率,提出了超重力技术耦合2-氨基-2-甲基-1-丙醇-对二氮己环(AMP-PZ)混合胺脱碳方法。正交实验表明:不同操作参数对脱碳率的影响显著性大小依次为:超重力因子、气液比、吸收剂质量浓度、主吸收剂含量、温度;最佳操作条件为:超重力因子为60,气液比为15,吸收剂质量分数为25%,主吸收剂质量分数为60%,温度为25℃,CO2脱除率可达97.16%。相对传统的乙醇胺(MEA)吸收塔法,CO2脱除率提高了7.16%。相同操作条件下,旋转填料床的脱碳反应速率常数比曝气反应装置高一倍。建立了超重力场中AMP-PZ脱碳表观动力学模型,不同操作参数对反应速率常数的显著性影响大小依次为:超重力因子>气液比>吸收剂质量浓度。 相似文献
14.
介绍了针对盐酸吸收工艺进行的改造.吸收尾气后的废水进行闭路循环并用作盐酸的吸收剂,杜绝废水的直接排放,并节约大量用水;改HCl气体空冷管为浸水石墨管,提高了盐酸的产量,不产生黄色的冷凝酸. 相似文献
15.
Based on a typical gas composition from a methanol-to-propylene(MTP) reactor, and guided by a requirement to recover both propylene and ethylene, three separation strategies are studied and simulated by using PROII package. These strategies are sequential separation, front-end dethanization, and front-end depropanization.The process does not involve an ethylene refrigeration system, using the separated stream as absorbent, and absorbing further the medium-pressure demethanization, and a proprietary technology by combining intercooling oil absorption and throttle expansion. Influences of different process streams as absorbent are studied on energy consumptions, propylene and ethylene recovery percentages, and other key-performance indicators of the separation strategies. Based on a commercial MTP plant with a methanol capacity of 1700 kt·a~(-1), the simulated results show that the front-end dethanization using the C_4 mixture as absorbent is the optimal separation strategy, in which the standard fuel oil consumption(a key-performance indicator of energy consumption) is18.97 kt·h~(-1), the total power consumption of two compressors is 22.4 MW, the propylene recovery percentage is 99.70%, and the ethylene recovery percentage is 99.70%. For a further improvement, the pre-dethanization and thermal coupling methods are applied. By using front-end pre-dethanization(partial cutting) with debutanizeroverhead, i.e. the C_4 mixture, as absorbent, the power consumption of the compressors decreases to 19.9 MW, an 11% reduction compared with the clear-cutting method. The energy consumption for the dual compressors for crude gaseous product mixture and main product propylene refrigeration is 16.69 MW, 16.55% lower than that of the present MTP industrial plant with the same scale, and a total energy consumption of 20 MW for the triple compressors including product gas mixture compression, and ethylene and propylene refrigeration. 相似文献
16.
有机胺吸收法是一种高效环保型烟气脱硫技术,而从系统工程的角度对烟气SO2捕集工艺的分析、优化和能耗评估尚未有详细报道。对N-甲基二乙醇胺(MDEA)为吸收剂的烟气SO2捕集过程工艺进行研究,考察了MDEA浓度、温度、SO2解吸率对捕集效果的影响规律。结果显示,MDEA溶液浓度为30%(质量)、烟气温度不高于45℃、回流贫液温度不高于41℃时,SO2吸收效果较好;增加SO2解吸率是以降低解吸气中SO2纯度和增大再沸器负荷为代价,水分汽化是再生能耗增高的主要原因。针对吸收剂再生过程能耗大的问题,采用热泵辅助精馏对解吸过程进行能量集成,吸收剂再生能耗可降低47%,年度总费用(TAC)可降低9.93%。本研究对有机胺体系的SO2捕集系统工业化应用具有重要的指导作用。 相似文献
17.
考察了盐酸作吸收剂时用气态膜技术从水溶液中脱氨的可行性,鉴于盐酸的挥发性,着重考察了不同料液氨水浓度下气态膜过程可以稳定操作时所对应的吸收液中盐酸的临界浓度。在此基础上,研究了料液氨氮浓度、料液流速、吸收液流速、吸收液盐酸浓度和操作温度等操作参数对膜传质性能的影响,并考察了该工艺的长期操作稳定性。实验结果证明,气态膜脱氨过程可采用一定浓度的稀盐酸溶液作为吸收剂,并可通过向吸收液中不断添加浓盐酸的方式得到浓度为>15%的氯化铵溶液。在料液浓度为2000 mg/L、吸收液盐酸浓度为2%、操作温度为25 ℃的操作条件下,中空纤维膜组件持续稳定运行了650 h以上,总传质系数保持在4.25×10?6 m/s左右。用盐酸作吸收剂时废水中氨氮可脱至15 mg/L以下,符合国家环保标准。这表明采用盐酸作吸收液用气态膜法从废水中脱除回收富集氨氮是可行的。 相似文献
18.
Ethylene oxide(EO) is an important raw material for producing ethylene carbonate(EC). However, the traditional method for the separation of EO from mixture gas by water in the refining process is high energy consumption. In this paper, two processes of manufacturing EC from EO mixture gas were studied by process simulation. Two processes for producing EC from EO mixture as raw materials without EO purification, called the OSAC process and the Modified OSAC process, were developed and assessed systematically. Both processes use EC as the absorbent to capture EO, avoiding the separation process of EO from solution. For comparisons, the EC producing process containing EO absorption by water, EO refinement and carbonylation process were also modeled, which was called the ERC process. Three schemes were designed for the EO absorber using EC as absorbent. Compared with the initial absorber scheme,the optimal liquid–vapor ratio is reduced from 1.66 to 1.45(mass). Moreover, the mass distribution analysis for the three processes were carried out in the form of the material chain. It was found that, compared with the ERC process, the energy consumption of the OSAC and the Modified OSAC process is reduced by 56.89% and 30.03%, respectively. This work will provide helpful information for the industrialization of the OSAC process. 相似文献
19.