XNC-98型催化剂在卡萨利甲醇合成塔中的应用

介绍XNC-98型甲醇合成催化剂在卡萨利甲醇合成装置中的应用情况,对卡萨利甲醇合成塔的长周期运行经验进行重点阐述。     

XNC-98催化剂在格炼10万吨甲醇装置的应用

格炼甲醇装置设计生产能力是10万吨／年。2003年格炼经招标选择了四川天一股份有限公司的合成甲醇催化剂XNC-98，使格炼甲醇装置自1999年投运以来，精甲醇产量首次突破10万吨／年，2004年实现并创下11．2万吨的记录。XNC-98投运1年来，日产量和总产量都超过了前两炉使用的MK-101和南化院催化剂。本文利用详实的数据说明了XNC-98具有的良好低温性能和高选择性。     

XNC-98型合成甲醇催化剂的性能及工业应用

简述了XNC-98型催化剂的性质和特征以及与国内、外催化剂的活性对比,并介绍了该催化剂在国内20多套不同原料、不同规模合成甲醇装置中的使用情况.长期工业运行表明,XNC-98型催化剂具有活性高、稳定性好、选择性佳、抗恶劣条件能力强等特点.     

XNC-98型甲醇合成催化剂活性分析及应用

近年来随着煤制甲醇工艺的不断发展,对甲醇合成催化剂提出了更高的要求。本文从甲醇合成工艺和XNC-98型甲醇合成催化剂的主要特点为出发点,研究了如何判断催化剂活性好坏的方法,以及分析了催化剂活性下降的原因。表明:该甲醇合成催化剂能够广泛应用于甲醇合成工艺,具有抗工况波动能力、优良的机械强度、选择性好、稳定性好、操作弹性较大、还原过程简单。在运行中应能够判断催化剂活性好坏和及时分析催化剂失活的原因,优化生产工艺。     

大型煤制甲醇装置合成单元运行分析和总结

针对河南龙宇煤化工有限公司甲醇合成装置中存在的催化剂使用周期短、合成塔底部超温等问题,分析了催化剂失活及合成塔底部超温的原因,采取了增加常温氧化锌精脱硫装置、采用XNC-98型甲醇合成催化剂、取消绝热层等措施。通过对催化剂净化系统和甲醇合成系统的控制,催化剂在运行周期、CO单程转换率、每m3催化剂对应的甲醇产量和甲醇产品质量这几个方面表现出优异的性能,取得了良好的运行效果。     

XNC-98型甲醇合成催化剂升温还原小结

介绍了XNC-98型甲醇合成催化剂的物理特性和组成，针对鲁奇合成塔的特点，制定了装填方案和操作步骤，详细阐述了该催化剂的升温还原方案和升温还原操作过程，对生产使用情况进行了总结。     

XNC-98合成甲醇催化剂的性能及工业应用

四川天一科技股份有限公司(原西南化工研究设计院)从20世纪70年代开始从事甲醇催化剂的研究，先后研制成功C302、C302-2、CNJ-206等合成甲醇催化剂，并且广泛应用于国内各种类型甲醇装置上。为达到世界先进水平，1995年受中石化委托，我们在CNJ-206基础上进一步研制开发新型合成甲醇催化剂，1998年通过部级鉴定，命名为XNC-98，     

300kt/a甲醇合成装置催化剂升温还原总结

介绍了300 kt/a甲醇装置工艺流程,阐述了XNC-98型甲醇合成催化剂的升温还原过程,分析了催化剂升温还原过程中的控制要点及存在的问题。装置运行结果表明,设计基本合理,催化剂还原比较成功,具有较高的活性和选择性,为装置稳定生产、经济运行奠定了基础。     

合成甲醇催化剂的开发与应用

从催化剂的活性、稳定性、选择性、堆密度等方面介绍了XNC-98新型甲醇催化剂的性能特点。通过工业应用实例,对该催化剂的使用情况进行了总结。     

陕西兴化51-7S型甲醇合成催化剂应用总结

陕西兴化集团有限责任公司300 kt/a甲醇装置2011年11月建成投产,甲醇合成塔采用华东理工大学的“管壳外冷-绝热复合式反应器”,甲醇合成塔前两炉使用的是庄信万丰51-7R型预还原甲醇合成催化剂和国产XNC-98型甲醇合成催化剂,本炉(第3炉)使用的是庄信万丰51-7S型甲醇合成催化剂,截至2022年10月底已累计运行约37个月。总结本炉51-7S型甲醇合成催化剂的装填、升温还原以及3 a来的运行情况,以及应用过程中出现的问题及解决措施。实践表明,51-7S型甲醇合成催化剂的活性、选择性及抗毒性较好,尤其是低温反应阶段表现出的较高活性,总的来说其运行是稳定可靠的,在同类型产品中具有较强的竞争优势。     

压力条件下淀粉合成甲基葡萄糖苷

以淀粉、甲醇为原料 ,以酸为催化剂 ,在压力条件下合成甲基葡萄糖苷 (简称甲苷 ) ,得出最佳催化剂是浓硫酸。通过正交实验 ,考察了糖醇比、反应压力、催化剂用量及反应时间对合成甲苷的影响 ,得到合成甲苷的最佳条件为n(淀粉 )∶n(甲醇 ) =1∶30 ,压力 0 5MPa ,催化剂用量为淀粉质量的 5 % ,反应时间 12 0min ,收率达 98 9%。     

QMG-01甲醇合成催化剂保护剂的开发及工业应用

研究开发了QMG - 0 1保护剂 ,实验室和工业应用结果表明 ,该保护剂具有活性高、Fe、Ni容量大的特点 ,可以广泛应用于合成气脱羰基铁、镍。在齐鲁石化第二化肥厂 10 0kt/a甲醇装置的条件下 ,对甲醇合成催化剂可起到有效的保护作用     

Operability of an Industrial Methanol Synthesis Reactor with Mixtures of Fresh and Partially Deactivated Catalyst

Disposal of spent catalyst is a common practice in industrial methanol synthesis. However, the spent catalyst has, generally, a good level of activity and can be used if mixed with fresh catalyst. In this work the operation of an industrial methanol synthesis reactor with mixtures of fresh and partially deactivated catalyst was investigated using a one‐dimensional transient model. Analysis of the deactivation behavior of low‐pressure methanol synthesis catalyst shows there is an extremely sharp rate of deactivation in a small part of the catalyst life‐time, which is followed by a relatively slow rate of deactivation in the remaining catalyst cycle‐time. Different configurations were studied for catalyst recycling, and two limiting cases are discussed in detail in this paper, namely layered and homogeneous (mixed) bed models. In the first one, the catalyst was segregated into two alternate layers of fresh and partially deactivated catalyst, while in the second homogeneity of the catalyst bed was simulated by segregating a large number of alternate layers of fresh and partially deactivated catalyst. It was observed in both cases that when catalyst recycling is used, the process does not depart significantly from the standard operating conditions, and also that the mixed bed had less influence on the reactor performance than layered one.     

可膨胀石墨催化合成丙烯酸甲酯

可膨胀石墨对丙烯酸甲酯的合成具有较高的催化活性。最佳条件为：甲醇与丙烯酸的物质的量比为1．15：1，催化剂用量为醇和酸总质量的5．56％，反应时间为55min，丙烯酸甲酯收率可达98％以上。     

A Crystalline Catalyst Based on a Porous Metal‐Organic Framework and 12‐Tungstosilicic Acid: Particle Size Control by Hydrothermal Synthesis for the Formation of Dimethyl Ether

The strategy for obtaining a crystalline catalyst based on a porous copper‐based metal‐organic framework and 12‐tungstosilicic acid with different particle sizes is reported. Through the control of hydrothermal synthesis and some simple treatments, catalyst samples with average particle diameters of 23, 105, and 450 μm, respectively, were prepared. This crystal catalyst has both the Brønsted acidity of 12‐tungstosilicic acid and the Lewis acidity of the copper‐based metal‐organic framework, and has high density of accessible acid sites. Its catalytic activity was fully assessed in the dehydration of methanol to dimethyl ether. The effect of particle size on the catalytic activity of catalyst was studied, in order to select the particle size appropriate for avoiding the diffusion limitation in heterogeneous gas‐phase catalysis. In the selective dehydration of methanol to dimethyl ether, this catalyst exhibited higher catalytic activity than the copper‐based metal‐organic framework, γ‐alumina, and γ‐alumina‐supported 12‐tungstosilicic acid catalysts. It showed high catalytic performances, even at higher space velocity or in the presence of excess water. In addition, the catalyst was also preliminarily assessed in the formation of ethyl acetate from acetic acid and ethylene. It also exhibited a high activity which was comparable with that of silica‐supported 12‐tungstosilicic acid catalyst.     

200kt/a焦炉气制甲醇装置合成催化剂升温还原过程简介

介绍200kt/a焦炉气制甲醇装置合成塔结构及催化剂装填情况,催化剂升温还原过程,导气及低负荷运行状况。     

Study of the Characteristics of Methanol Synthesis in a Recirculation Slurry Reactor – A Novel Three‐Phase Synthesis Reactor

A process feasibility analysis on the liquid phase methanol synthesis (LPMeOH^TM) process was performed in a recirculation slurry reactor (RSR). In the three‐phase RSR system, a fine catalyst is slurried in the paraffin and this catalyst slurry is continuously recirculated through the nozzle from the slurry sector to the entrained sector by a pump. The syngas is fed concurrently with the downward flow of slurry to form the methanol product. A laboratory scale mini‐pilot plant version of a recirculation slurry reactor system was successfully designed and built to carry out process engineering research, and in addition, an identical cold model was built to measure the mass transfer coefficient in the recirculation slurry reactor. The effects of operating conditions, including temperature, pressure, gas flow rate and catalyst slurry recirculation flow rate on the productivity of methanol were studied. This experimental data helps the scale‐up and commercialization of the methanol synthesis process in recirculation slurry reactors.     

Equilibrium calculations for direct synthesis of dimethyl ether from syngas

Thermodynamic analysis of single‐step synthesis of dimethyl ether (DME) from syngas over a bi‐functional catalyst (BFC) in a slurry bed reactor has been investigated as a function of temperature (200–240°C), pressure (20–50 bar), and composition feed ratio (H₂/CO: 1–2). The BFC was prepared by physical mixing of CuO/ZnO/Al₂O₃ as a methanol synthesis catalyst and H‐ZSM‐5 as a methanol dehydration catalyst. The three reactions including methanol synthesis from CO and H₂, methanol dehydration to DME and water–gas shift reaction were chosen as the independent reactions. The equilibrium thermodynamic analysis includes a theoretical model predicting the behaviour and a comparison to experimental results. Theoretical model calculations of thermodynamic equilibrium constants of the reactions and equilibrium composition of all components at different reaction temperature, pressure, and H₂/CO ratio in feed are in good accordance with experimental values.