变压吸附提氢技术在合成氨弛放气氢回收装置的应用

采用变压吸附方法对合成氨弛放气中的氢进行分离提纯。介绍了变压吸附提氢的工艺流程、装置规格及吸附剂的选择;分析和总结了变压吸附装置的生产运行状况、相关运行数据和产生的经济效益。     

合成氨回路中降低惰性气体含量的措施

分析了现有合成氨回路惰性气体浓度增加的可能原因,介绍了深冷分离、变压吸附、膜分离法3种合成氨弛放气回收氢降低惰性组分含量的技术,并进行了对比分析。对于大型合成氨厂,可以在氨合成之前采用深冷净化装置或变压吸附装置净化原料气,以降低原料气中惰性组分的含量;对于小型合成氨厂,可以考虑从驰放气提氢方面入手。     

变压吸附技术在氮肥企业的成功应用

介绍了变压吸附（PSA）法脱除变换气中二氧化碳装置的情况及工艺流程,从环保的角度分析了变压吸附法脱除变换气中二氧化碳装置的主要污染源及污染物,并将变压吸附与常规吸附的经济效益进行了比较,证明变压吸附法脱除变换气中二氧化碳工艺的优越性。     

利用甲醇车间变有附装置回收利用合一“双甲”改造后驰放气中H2的可行性研究

从工艺和经济效益的角度，研究利用甲醇车间变压吸附装置回收合一“双甲”改造后驰放气中H2的可行性。     

合成氨弛放气变压吸附提氢

针对合成氨弛放气装置新上一套变压吸附提氢装置,介绍了变压吸附技术的工作原理、工艺流程及装置物点.装置运行一年多来,回收合成氨弛放气7 000余成m3,公司年增效益2 900万元.     

变压吸附脱碳优化改造总结

变压吸附分离技术对于含多种杂质的混合气可以一次脱除,目前已广泛应用于合成氨系统中,用以净化合成气同时为尿素生产提供二氧化碳。本文介绍了变压吸附脱碳逆放气回收的改造情况。     

利用变压吸附气体分离技术从合成氨弛放气中回收氢气

变压吸附（PSA）气体分离是一种高效、节能的回收提纯技术,其在石化、化工行业得到了越来越广泛的应用。早在60年代,美国联合碳化物公司就开始采用变压吸附分离技术从含氢工业废气中回收提纯氢气。到70年代中期,变压吸附分离提纯技术得到了迅猛发展。至今,世界各约有800余套变压吸附分离提纯装置在运行,规模从100－7000m^3/h（标态）。原化工部西南化工研究院是我国最早进行变压吸附分离纯技术研究开发的单位之一,其研制的变压吸附分离提纯装置在我国得到了广泛的应用。我所在90年代中期开始对变压吸附分离提纯技术进行研究开发,并成功地解决了变压吸附工业装置大型化的相关问题,在短短的几年内设计建造了数十套不同规模的变压吸附分离提纯制氢装置,气源种类也日益扩大,其中包括合成氨弛放气和变换气、甲醇尾气、催化干气、加氢尾气、焦炉煤气、城市煤气等多种含氢气源。     

变压吸附法脱除变换气中二氧化碳的技术总结

简要介绍变压吸附(PSA)法脱除变换气中二氧化碳装置的工艺流程及运行情况,提出在生产运行中需要注意的问题,并对几种脱除变换气中二氧化碳的工艺进行经济分析比较。     

山东瑞星化工有限公司无动力氨回收装置投入运行

无动力氨回收装置是山东瑞星化工有限公司继闪蒸气变压吸附提氢投运后又一节能降耗新举措。该装置在不消耗能量的情况下,将驰放气中的氨提取回收,作为产品氨直接用于生产尿素。     

读者信箱

<正> 一、问:什么叫变压吸附?答:变压吸附是利用分子筛在不同的压力及温度条件下,对混合气体进行选择性的吸收,并控制压力及温度进行解吸,用以达到分离混合气体的目的。如石油化工、化肥工业以及其它行业中均有应用。如利用分子筛变压吸附分离合成氨厂驰放气中的甲烷及氢;利用分子筛变压吸附分离空气中的氧及氮,利用分子筛变压吸附分离空气中的二氧化碳。这些分子筛有沸石,碳以及 A 型分子筛等。二、问:碳酸氢铵肥料堆放在露天有什么害     

变压吸附分离工业废气二氧化碳的研究进展

概述了未来人类对过量二氧化碳排放的处理办法,即碳的捕获和存储(CCS).简介了4种二氧化碳的分离工艺及特点和工业中二氧化碳的捕获系统.阐述了变压吸附工艺的基本原理和其在捕获工业废气中二氧化碳上的应用,以及变压吸附分离二氧化碳的工艺在循环结构设计、吸附剂材料和数值模拟等方面的研究进展和国内外的工业化应用.分析了目前该工艺仍存在的问题,指出该技术具有广阔的应用前景.     

变压吸附技术在气体分离提纯中的应用

介绍了变压吸附技术的基本原理、发展概况及基本工作过程,并阐述了该技术在氢气的分离与提纯、二氧化碳的分离与提纯、一氧化碳的分离、空气分离制氧、空气分离制氮、碳的脱除等工业过程中的应用,对变压吸附技术今后的发展提出了展望。     

放散高炉煤气的碳减排利用途径研究

针对高炉煤气中氮气与CO、CO_2分离困难,开发出回收其中CO和CO_2的变压吸附新技术.CO和CO_2与变压吸附从焦炉煤气中提取的H_2配合,可获得满足要求的甲醇合成气,并同时保证钢铁生产的物质平衡和能量平衡.新工艺为物理分离、混合过程,不包含转化等反应步骤,过程简单,是一种高炉煤气碳减排利用的有效方法.     

Removal of CO from process gas with Sn–activated carbon in pressure swing adsorption

A pressure swing adsorption (PSA) system using activated carbon impregnated with SnCl ₂·2H ₂ O and pure activated carbon was used to remove CO from a model H ₂/CO mixture representing the steam reformer process gas. On comparing PSA results for both carbons, the CO adsorptive capacity of impregnated carbon was found to be superior to that of the pure carbon. This was confirmed by the fact that the concentration of CO, initially at 1000 ppm, was successfully reduced to 4.02% and 1.04% of its initial concentration by the pure and the impregnated activated carbons respectively in the PSA system. The species in the impregnated carbon responsible for the improved gas phase CO adsorption was found to be SnO ₂. Simulation results at a cyclic time of 600 s in the PSA operating at 10 atmospheres gave a product recovery and purity of 99.99% and 57.48%, respectively. At 6 atmospheres, the product recovery and purity were 92.17% and 77.12%, respectively. © 2000 Society of Chemical Industry     

炭质吸附剂的孔结构修饰及表征

用1-丁烯炭沉积法修饰碳分子筛的孔结构。考察了炭沉积的位置、浓度、温度、沉积时间和活性组分对沉积效果的影响。结果表明,当1-丁烯浓度为31.8%,沉积温度为993 K,沉积时间为10 min,炭沉积量合适时,空气变压吸附(PSA)N2浓度可达85.6%;对浸Ni(Ni载持量5%)样,炭沉积主要发生在接近外表面的中孔和大孔中,不容易导致孔的堵塞,Ni的加入起到了提高炭沉积选择性的作用,(PSA)N2浓度可达91.0%。FT-IR、XRD、in-situTG/DTA测试表明,经炭沉积修饰后的碳分子筛具有微孔分布独特的骨架网络结构。     

Predictive Dynamic Model of Air Separation by Pressure Swing Adsorption

A general dynamic model is developed for separation of air over a carbon molecular sieve and a zeolite adsorbent for production of nitrogen and oxygen. The proposed model is validated using experimental data from working laboratory scale N₂–PSA and laboratory scale O₂–PSA systems. Simulations studies are performed to investigate the effect of changing various process variables, such as the duration of PSA steps, bed length and feed inlet velocity.     

Large‐scale optimization strategies for pressure swing adsorption cycle synthesis

Pressure swing adsorption (PSA) is an efficient method for gas separation and is a potential candidate for carbon dioxide (CO₂) capture from power plants. However, few PSA cycles have been designed for this purpose; the optimal design and operation of PSA cycles for CO₂ capture, as well as other systems, remains a very challenging task. In this study, we present a systematic optimization‐based formulation for the synthesis and design of novel PSA cycles for CO₂ capture in IGCC power plants, which can simultaneously produce hydrogen (H₂) and CO₂ at high purity and high recovery. Here, we apply a superstructure‐based approach to simultaneously determine optimal cycle configurations and design parameters for PSA units. This approach combines automatic differentiation, efficient ODE solvers for the state and sensitivity equations of the PSA model, and state of the art nonlinear programming solvers. Three optimization models are proposed, and two PSA case studies are considered. The first case study considers a binary separation of H₂ and CO₂ at high purity, where specific energy is minimized, whereas the second case study considers a larger five component separation. © 2012 American Institute of Chemical Engineers AIChE J, 58: 3777–3791, 2012     

煤基碳分子筛的制备及CH4/N2分离性能研究

以煤为原料,通过气相碳沉积法制备了CH4/N2变压吸附分离用碳分子筛,研究了苯沉积量对碳分子筛吸附性能的影响。用液氮吸附（77 K）、扫描电镜对碳分子筛孔结构及表面形貌进行了表征,结果表明：制备的碳分子筛（CMS-1）平衡分离系数大于5,比表面积SBET=251.5 m2/g,微孔孔容Vm=0.1178 mL/g,孔径主要分布在0.35~2 nm,能满足CH4/N2变压吸附分离要求。     

Adsorption of carbon dioxide, ethane, and methane on titanosilicate type molecular sieves

The separation of carbon dioxide from light hydrocarbons is a vital step in multiple industrial processes that could be achieved by pressure swing adsorption (PSA), if appropriate adsorbents could be identified. To compare candidate PSA adsorbents, carbon dioxide, methane, and ethane adsorption isotherms were measured for cation exchanged forms of the titanosilicate molecular sieves ETS-10, ETS-4, and RPZ. Mixed cation forms, such as Ba/H-ETS-10, may offer appropriate stability, selectivity, and swing capacity to be utilized as adsorbents in CO₂/CH₄ PSA processes. Certain cation exchanged forms of ETS-4 were found to partially or completely exclude ethane by size, and equivalent RPZ materials were observed to exclude both methane and ethane, while allowing carbon dioxide to be substantially adsorbed. Adsorbents such as Ca/H-ETS-4 and Ca/H-RPZ are strong candidates for use in PSA separation processes for both CO₂/C₂H₆ and CO₂/CH₄, potentially replacing current amine scrubber systems.     

Separation of Gases by Pressure Swin

Abstract

The recent status of pressure swing adsorption (PSA) as a process for separating multicomponent gas mixtures is reviewed. The applications of a new generation of adsorbents, such as zeolites, carbon molecular sieves, and, more recently, pore engineered molecular sieves, are described in detail. The more important theories of adsorption from gas mixtures as well as those of the PSA process are described briefly. The commercial applications of PSA the process-present and potential-are discussed at length.