变压吸附制氮技术及其设备选型

分析了变压吸附制取氮气的原理、工艺流程,比较了变压吸附制氮与其他制氮方法的优点,并且就变压吸附选型的几个关键的技术和装备进行了介绍。     

变压吸附制氮技术在石化企业中的应用

变压吸附制粗氮已成功投用于化纤生产，本文介绍了PN—5000型变压吸附制氮及NC—3000型氮气净化工艺技术，分析了变压吸附部分氮气产量、压力与纯度之间的关系，并与同规模的深冷制氮技术在操作、经济性方面进行了较全面的比较。     

变压吸附分离技术在氮气生产中的应用

分析了变压吸附气体分离技术制取氮气的原理、工艺流程,比较了变压吸附制氮与其他制氮方法的优点,并且就变压吸附制氮装置选型时注意事项和装备进行了介绍,在2000m3(标)/h能力范围内,比深冷更具吸引力。     

医药化工的变压吸附(PSA)制氮技术探讨

在化工生产中,氮气属于惰性气体,化学性质较为稳定,不容易与其他物质发生反应,因此广泛用作保护气、密封气等。在医药生产中,氮气的使用较多,目前制氮技术主要有PSA变压吸附法、低温法、膜分离法,而应用最为广泛的一种制氮技术为PSA制氮技术。从医药化工的变压吸附(PSA)制氮技术,以及相关的内容进行了分析。     

碳分子筛分离空气制氮探讨

本文简要地介绍了碳分子筛变压吸附空分制氮的基本原理、工艺流程、变压吸附程序、制氮能力和装置特点等。并指出所制取的富氮气纯度高,可作为中性保护气体用于各工业部门。本装置对于没有制氧站的中小型工厂和有关部门的用氮,提供了一种节能、经济、安全和方便的新氮原。     

变压吸附制氮技术的应用

从变压吸附制氮技术原理和沈阳化工公司变压吸附制氮生产的实际情况,分析了变压吸附制氮技术的应用及发展前景。说明了变压吸附制氮技术在化工生产中仍是较适宜的制氮方法。     

碳分子筛变压吸附制氮机在酮苯脱蜡装置中应用的可行性探讨

碳分子筛变压吸附制氮机广泛应用于化工、冶金、电子工业,但在炼油厂酮苯脱蜡装置中的应用还没有先例。本文提出了用碳分子筛变压吸附制氮机制取氮气满足装置过滤系统密闭及氮气汽提用气,从而取代目前惰性气发生炉通过燃烧耗氧制取氮气的常规工艺,根据项目投用后核算结果及投资回收期的预测,结论认为：碳分子筛变压吸附制氮机在炼油厂酮苯脱蜡装置中的应用是可行的。     

变压吸附制氮装置在大化肥厂中的应用

介绍变压吸附制氮技术及其在锦西天然气化工有限责任公司的使用情况。指出该工艺操作简单，弹性好，技术成熟，出合格氮气时间短，摆脱庞大的深冷工艺制氮。     

制氮工艺技术的比较与选择

介绍了深冷分离、PSA变压吸附和膜分离3种制氮工艺的工作原理和工艺流程;比较了3种制氮工艺的工艺性能、主要设备和相对投资;提出了如何根据不同的氮气需求选择合适的制氮工艺的方法。     

变压吸附制氮性能主要影响参数的研究

介绍了变压吸附制氮技术的优点、原理方法及工艺流程,实验研究了吸附压力、吸附解吸时间、产品流量等主要工艺参数对变压吸附制氮装置性能的影响,最后得出实验装置的最佳工艺条件为:吸附压力0.8 MPa,吸附解吸时间54 s,均压时间4 s,产品气出气流量7 m3/h。此时,实验装置制得的产品氮气体积分数最稳定,平均体积分数98%以上,回收率在40%左右。     

我国变压吸附技术的工业应用现状及展望

介绍了我国变压吸附技术近十多年发展状况及变压吸附技术在各应用领域的最新发展,并对今后的应用和发展作了展望。     

焦炉气制甲醇驰放气合成氨工艺研究

甲醇生产过程中排放的弛放气经过变压吸附制氢气,空分装置来的氮气进行脱氧精制,以氢气和氮气为原料设计合成氨工艺,使资源得到充分利用。     

Modelling of the pressure swing air seperation process

A theoretical analysis is given of the separation of oxygen and nitrogen in air by a single column pressure swing gas separation process. The problem treated includes changes in mass flow due to adsorption. The findings are compared with data obtained using molecular sieve adsorbent.     

炭分子筛上氧、氮吸附特性的实验测定

针对BF型炭分子筛孔结构的特点,利用双分散孔结构吸附模型,采用色谱扰动-应答方法,对微孔扩散控制传质机理进行了实验认定,测定了O2的吸附平衡常数K、扩散时间常数Dc/rc2以及O2、N2两组分常温下的吸附等温线.     

变压吸附法富氧用于固定床煤气炉连续气化工艺技改方案的技术经济分析

概述了我国中氮肥行业固定床煤气炉空气间歇气化和富氧连续气化工艺技术现状，着重讨论了变压吸附法分离空气制富氧技术，分析论证了变压吸附法富氧用于Φ３０００ｍｍ、Φ２７４５ｍｍＵＧＩ型间歇式固定床煤气炉进行常压连续气化工艺的经济效果，并探讨了可行的技改方案。     

Single bed pressure swing adsorption process to generate high purity nitrogen

The separation of air for the production of nitrogen by pressure swing adsorption over a carbon molecular sieve is kinetically based. The basic steps involved in a cycle are typically pressurization, high pressure adsorption, countercurrent blowdown and vent. Simulations studies with DAPS (Dynamic Adsorption Process Simulator) were performed to analyze the effect of the pressurization rate and bed length on the performance of a single bed nitrogen pressure swing adsorption unit in the high purity region. Both specific product and yield improve with the bed length due to the reduction in the axial dispersion effect. A comparison between the predictions of the theoretical model and experimental results was carried out.     

Effect of regeneration pressure level in kinetically controlled pressure swing adsorption

The kinetic separation of air for the production of nitrogen by pressure swing adsorption was studied by using a highly selective carbon molecular sieve. The recovery generally increases as the specific purge decreases, and the pressure ratio increases. However, for certain ranges of purities and cycle times, a maximum in the performance is found experimentally at intermediate pressure ratios. This phenomenon can be explained with an existing model of adsorption kinetics on carbon molecular sieves: the slit-potential model. The theory is used to analyse the effect of different process variables on the pressure swing adsorption performance, and a good agreement between the experimental results and the predictions is found.     

Gastrennung mit Druckwechsel-Adsorptionsanlagen

Gas separation in pressure swing adsorption plant . In recent years gas separation in pressure swing adsorption plant has acquired considerable significance as an industrially implemented process. This is particularly true of plant for isolation of pure hydrogen from gas mixtures of various origins. Starting from the underlying principles, this contribution considers the various types of plant for hydrogen isolation, for obtaining carbon monoxide, for recovery of ethylene, for separation of oxygen or nitrogen from the air, and for ozone isolation.     

煤层气在活性炭和炭分子筛上变压吸附分离

变压吸附分离是有效的气体分离提纯方法,采用合适的吸附剂可对煤层气(CH4/N2混合气体)进行高效分离,节约能耗。在单床吸附装置上测量了CH4/N2混合气体在3种活性炭和4种炭分子筛吸附柱上的穿透曲线,并进行实验研究再生条件对吸附剂分离性能的影响。实验结果表明,7种吸附剂均对CH4/N2混合气具有一定程度的分离能力,且高温真空再生后吸附效果更好;但仍需开发出更有效的吸附剂。     

Effect of Drying Method on Gas Adsorption Characteristics of Carbon Gel Microspheres

Abstract

The effect of drying method used in the preparation of carbon gel microspheres was studied by comparing the porous properties of carbon cryogel microspheres (CCM) and carbon xerogel microspheres (CXM), which were respectively obtained using freeze drying and hot air drying. CCM were found to possess higher mesoporosity than CXM because freeze drying was effective to suppress the shrinkage of the mesopores during drying. On the other hand, the microporosity of the carbon gel microspheres was hardly influenced by not only the drying method but also the synthesis condition. Although the amounts of nitrogen and oxygen adsorbed were almost the same, the adsorption rate of nitrogen on both CCM and CXM possessing ultramicroporous surfaces was much larger than that of oxygen, which indicated the applicability of the carbon gel microspheres to adsorbents for pressure swing adsorption (PSA) of air. The relations between the temperature and the amount of oxygen adsorbed showed the adsorption characteristics of CCM and CXM as adsorbents for temperature swing adsorption (TSA) were almost the same.