新型碳三液相加氢催化剂工业侧线评价

以兰州石化24万吨乙烯车间裂解料为原料,模拟工业装置工况,LY-C3-A与对比催化剂1000 h活性和稳定性试验结果表明：在其它工艺相同条件下,LY-C3-A入口温度比对比剂低5～8℃、床层温升高2.3 ℃,LY-C3-A丙烯转化率优于对比剂4个百分点,且LY-C3-A催化剂丙烯选择性高于对比剂10个百分点。评价结果证明LY-C3-A综合性能优于对比剂且达到工业装置应用要求。     

碳二加氢反应器的优化

合理分配一段、二段、三段的炔烃脱除量,并配入适量CO,可以将三段入口乙炔浓度提高到0.2%左右,二段入口乙炔浓度提高到0.6%左右,从而提高加氢反应的选择性,增加乙烯收率,使得装置运行时间更长。     

负载铂壳聚糖交联度对肉桂醛选择性加氢反应的影响

控制戊二醛(GA)含量制备一系列不同交联度的负载Pt的壳聚糖(CS)催化膜,并探讨其对肉桂醛选择性加氢制备肉桂醇的催化效果。Pt纳米簇用微波法制备,用透射电子显微镜(TEM)测得其平均粒径为3.6 nm。用气相色谱–质谱联用、X射线衍射仪、紫外分光光度计对所得产物进行表征,X射线光电子能谱(XPS)测定结果显示Pt与CS膜之间存在配位作用。实验结果表明,随着交联度的增加,肉桂醇的催化选择性呈现先增后减的趋势,其中交联度为57.32%时肉桂醇选择性为84.27%。     

高选择加氢方法合成铃兰醛

研究了非晶态NiB催化下,α-甲基对叔丁基苯丙烯醛液相选择加氢合成铃兰醛。研究了加氢温度、压力、溶剂及添加剂对加氢反应的影响。动力学分析表明加氢反应对于底物呈一级动力学关系,同时发现加氢反应溶剂效应对于铃兰醛的选择性有较大影响,在甲苯、乙醇及环己烷中分别为100%、98.8%和85.0%。     

On the Switch Between Selective Oxidation and Selective Hydrogenation of a Terminal Alkene on Well-Defined Titania Surfaces

Stoichiometric, hydroxylated titania surfaces are effective for the partial oxidation of styrene to acetophenone. The initial product of reaction is styrene epoxide which undergoes isomerisation to acetophenone, the thermodynamically favoured product. The oxygen in the product derives exclusively from the water used for hydroxylation, and not from the titania lattice. Surface hydroxyl groups are the active sites for this 100% selective, partial oxidation. Controlled reduction of titania to TiO_x leads to the appearance of bandgap photoemission associated with the formation of Tiⁿ⁺ (n = 0--3) at the surface. This results in complete suppression of all oxidation activity and a switch to selective hydrogenation: the reaction product is now ethylbenzene, again produced with 100% selectivity. The important implications of these findings for an understanding of the properties of metal/titania catalysts used for alkene conversion are discussed.     

脱氢橙花叔醇的选择性加氢反应研究

脱氢橙花叔醇在催化剂存在和常压（或接近常压）下发生选择性部分氢化反应,形成橙花叔醇.脱氢橙花叔醇氢化反应的合理条件：乙炔化产物中加入质量分数0.075%的Lindlar催化剂（Pd含量5%）、甲苯（按每g乙炔化产物中加入2 mL甲苯的比例计）和少量喹啉,50～60℃通氢气还原,反应终点由色谱跟踪分析结果确定.橙花叔醇的氢化反应得率可达96.2%.     

Analysis of Operating Variables in the Catalytic Purification of Butene-1 in a Trickle Bed

A mathematical model for analyzing and simulating selective hydrogenation of butyne-1 and 1,3-bu-tadiene in industrial trickle bed reactors operated to obtain high purity butene-1 is presented in this work.Fromthe analysis of typical operating conditions,only the relevant phenomena are finally retained in the model formu-lation.The model is then employed to analyze the effect of operating variables and catalyst selectivity in processperformance.In particular,the search for the minimum hydrogen flow rate necessary to fulfil butene-1 purityspecifications is undertaken.     

碳三催化蒸馏选择加氢工艺研究

将碳三加氢催化剂装入高压脱丙烷塔,在完成碳三、碳四分离的同时实现了丙炔、丙二烯的加氢.在1.6～2.0MPa时,塔顶丙炔、丙二烯的质量分数控制在1.5×10-5以下,丙烯收率达到102%.研究了压力、空速、回流比、氢炔比对产率的影响,1840h的长周期考察表明催化蒸馏加氢工艺可以延长运转周期.     

长链双烯烃选择性加氢催化剂及工艺的工业化应用

DSH－1型含贵金属Pd双烯选择性加氢催化剂与多段加氢工艺结合，应用于脱氢法生产直链烷基苯的联合装置中，能有效地脱氢过程产生的双烯烃转化成单烯烃，具有很好的反应活性和选择性，且操作弹性大，工艺过程简单，在提高烷基苯产量，降低消耗的同时，大大提高烷其苯质量。     

Ni-Mg/Al2O3催化剂上催化裂化轻汽油的选择性加氢

制备了以γ-Al2O3为载体的镍基双金属选择性加氢催化剂,并用于催化裂化轻汽油的选择性加氢反应。考察了载体焙烧温度、金属镍与镁的负载量对催化剂选择性加氢性能的影响。结果表明,适当高的焙烧温度降低了催化剂的比表面积和表面酸性,提高了催化剂的稳定性。助剂镁的加入有利于活性组分Ni的均匀分散,并进一步降低催化剂的表面酸性。在反应温度80℃、空速10h^-1、氢油体积比为10、压力1．5MPa的条件下,采用NI：(10％)-Mg(1．5%)／AL2O3催化剂,催化裂化轻汽油中二烯烃转化率达到98％以上。制备的选择性加氢催化剂具有良好的活性和选择性,可望在选择性加氢领域获得应用。     

苯液相部分加氢制备环己烯影响因素的探讨

以 Zr O2 为载体 ,钌为活性组分制备苯部分加氢催化剂 ,在 0 .5 L 反应釜上对苯液相部分加氢过程的主要因素进行了逐一考察。由此得出适宜的反应条件为 :催化剂 /苯=1.5 g/ 10 0 g,反应温度 140～ 15 0℃ ,反应压力 4.0 MPa,搅拌速度 110 0 r/ min,水相中硫酸钴含量 3.5 % (wt) ,在上述条件范围内的适宜反应时间 6 0～ 80 min。     

脱氢橙花叔醇的选择性加氢反应研究

脱氢橙花叔醇在催化剂存在和常压(或接近常压)下发生选择性部分氢化反应,形成橙花叔醇。脱氢橙花叔醇氢化反应的合理条件:乙炔化产物中加入质量分数0.075%的L ind lar催化剂(Pd含量5%)、甲苯(按每g乙炔化产物中加入2 mL甲苯的比例计)和少量喹啉,50~60℃通氢气还原,反应终点由色谱跟踪分析结果确定。橙花叔醇的氢化反应得率可达96.2%。     

A study about the effect of the temperature of hydrogen treatment on the properties of Ru/Al2O3 and Ru/C and their catalytic behavior during 1-heptyne semi-hydrogenation

The 1-heptyne selective hydrogenation carried out at 150 kPa, and at 283 and 303 K using Ru/Al₂O₃ and Ru/C as catalysts, was studied. Catalysts were prepared by the incipient wetness impregnation technique using RuCl₃ as precursor. Ru/Al₂O₃ was treated in hydrogen at 373 or 573 K and Ru/C only at the last temperature. Catalysts were characterized by hydrogen chemisorption, TPR and XPS. Ru dispersion after treatment in hydrogen at the highest temperature is similar for both catalysts. Ru is present as Ru⁰ in Ru/C, while Ru⁰ and Ru electron-deficient species are present on the catalysts surface after hydrogen treatment at the two temperatures using Al₂O₃ as support. The best catalytic behavior was observed for the highest temperature of hydrogen treatment and for 303 K reaction temperature. As a consequence of a shape selectivity effect of the C support, the best conversion is obtained with the alumina supported catalyst.     

Novel cluster-derived catalysts for the selective hydrogenation of crotonaldehyde

The controlled pyrolysis of transition metal cluster substituted metal carboxylates, e.g., M₄O[(CO)₉Co₃CCO₂]₆, where M = Co and Zn, and M'₂(CO)₉Co₃CCOO₄, where M' = Co, Mo, and Cu, results in the formation of high surface area, amorphous solids that are active and selective catalysts for the hydrogenation of crotonaldehyde. In contrast to conventional metal catalysts that are selective for the double bond hydrogenation, these new solids exhibit high regioselectivities for the conversion of crotonaldehyde (2-butenal) to crotyl alcohol (2-butenol). Further, the observed selectivities depend on the metal cluster carboxylate structure.     

C5馏分在我国的加氢利用研究进展

随着乙烯工业的快速发展,碳五(C5)馏分是作为蒸汽裂解制乙烯的副产物,其资源日趋丰富,基于C5馏分的综合利用研究变得日趋重要,对该领域的研究已引起相关科研人员的普遍重视.简述了近年来C5馏分在国内外的综合利用现状,并结合我国国情,着重归纳总结了在我国C5馏分的加氢利用方法,阐述了其加氢反应机理,同时描绘了该领域的未来发...     

引进脂肪胺生产装置工艺特点

介绍引进意大利ＧＩＡＮＡＺＺＡ公司的脂肪胺生产装置工艺过程,采用间歇式液要法制取脂肪腈,批料操作时间１０ｈ,最终脂肪腈的酸值在０．５以下,伯胺反应温度１３０℃￣１４０℃,反应压力１．２ＭＰａ￣１．６ＭＰａ,仲胺反应温度２００℃￣２２０℃,反应器中２ｈ￣４ｈ即可反应完成。提出了脂肪腈装置存在的问题及相应的解决方案。     

炔烃及二烯烃选择加氢催化剂的研究进展

综述了在炔烃和二烯烃选择加氢制烯烃过程中的催化剂的应用研究进展。     

Vapor‐phase selective hydrogenation of citral over Pd/bentonite: effect of reduction method

BACKGROUND: Well‐dispersed nanoparticles of palladium were synthesized by wet impregnation technique over bentonite followed by three different reduction methods (H₂ or NaBH₄ or ethanol) and characterized by transmission electron microscopy, X‐ray diffraction, temperature‐programmed reduction and atomic absorption spectroscopy. Hydrogenation of citral over Pd‐supported bentonite catalysts was studied in vapor phase using a micro‐reactor. The effect of reduction method and metal loading on the conversion of citral and selectivity towards nerol and geraniol were examined. RESULTS: Among the catalysts evaluated in the vapor phase, Pd/bentonite reduced by ethanol was found to give the highest conversion and Pd/bentonite reduced by NaBH₄ was found to give the highest selectivity towards nerol and geraniol. This may be attributed to the smallest particle size of Pd in the former catalyst and presence of boron species on the latter catalyst, respectively. CONCLUSION: The presence of boron in proximity to palladium particles polarized C?O bond and helped C?O adsorption, thereby yielding nerol and geraniol (the unsaturated alcohols). Copyright © 2008 Society of Chemical Industry     

苯选择加氢生产环己酮和苯酚

提出了由苯选择加氢生产环己酮和苯酚的工艺路线,并与工业上占主导地位的异丙苯法生产苯酚工艺路线进行对比,讨论了该路线的可行性、优越性和关键性技术问题,指出了其工业应用前景及今后的研究方向.     

清江汽油选择性加氢脱硫生产运行问题及对策

介绍了清江石化催化汽油选择性加氢脱硫生产装置技术特点、运行情况、运转过程中出现一些问题,主要问题有脱硫率不高和一反压降升高,针对出现的问题所采取的措施,以解决问题。从装置运行情况来看,采用RSDS-II技术可以生产满足国Ⅳ标准的汽油,且产品辛烷值损失小。