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。     

PSA制氮技术及闭路循环流化干燥系统用于化工助剂生产

介绍了变压吸附制氮技术的基本原理 ,以及闭路循环干燥系统在化工助剂生产中的工业应用     

变压吸附制氮技术的发展和应用

综述了变压吸附技术的原理、发展及碳分子筛和沸石分子筛两种吸附剂变压吸附技术制氮的国内外研究进展,提出了变压吸附技术制氮的发展方向。     

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。     

变压吸附制氮装置在氯碱行业中的应用

论述了变压吸附制氮技术的基本原理，并与深冷制氮技术进行对比及变压吸附制氮装置在氯碱行业中应用情况。     

变压吸附制氮装置用于工业生产中的惰性保护

简要介绍变压吸附制氮技术的基本原理、变压吸附制氮装置以及用于工业生产中的惰性保护     

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。     

变压吸附制氮机组运行总结

变压吸附空分制氮技术以洁净的压缩空气为原料,利用焦炭分子筛吸附其中的氧气成分,从而制得高纯度的氮气。介绍了变压吸附制氮机组的工作原理、影响氮气纯度的因素以及运行状况。     

用高性能制氧分子筛变压吸附

对沸石分子筛进行离子交换改性 ,同时严格控制成型活化条件 ,开发出变压吸附空分用系列高性能制氧分子筛。测试其氮、氧静态吸附等温线以及吸附热数据 ,并对数据结果进行分析。这为进一步开发和优化变压吸附制氧过程提供了良好的基础     

Oxygen Production by Pressure Swing Adsorption

Abstract

The specific oxygen production capacity and the oxygen recovery of a pressure swing adsorption (PSA) process for the production of oxygen from ambient air by selective adsorption of nitrogen can be increased by operating the process at a superambient temperature. The higher temperature operation provides more efficient desorption of nitrogen from the adsorbent which more than off-sets the detrimental effects of the lower selectivity and capacity of adsorption of nitrogen from air at the elevated temperature. The concept is demonstrated by evaluating the performance of an eight-step PSA-oxygen process to produce a 90% oxygen product stream at different temperatures. It is shown that 10% higher oxygen production capacity and 14.5% larger oxygen recovery can be obtained by operating the PSA process at 60°C compared to its performance at 30°C. The PSA process and its performance data from a pilot plant are discussed.     

Carbon-based oxygen selective desiccants for use in nitrogen PSA

Techniques for the production of composite oxygen selective adsorbents are disclosed. These adsorbents are comprised of a carbon molecular sieve (CMS) which is kinetically selective for the adsorption of oxygen over nitrogen and an agent for the sorption of water such as LiCl or SiO₂. The adsorption properties of the composite adsorbents and results obtained from pressure swing adsorption (PSA) process testing are presented. The composite adsorbents improve the nitrogen PSA process performance (recovery and productivity) over the use of conventional desiccants which do not exhibit oxygen selectivity. Using a standard nitrogen PSA process cycle, replacement of conventional inorganic desiccants like alumina with the current CMS-based desiccants improved air recovery 2 to 4 percentage points and increased nitrogen productivity 15 to 20% at 70°F and a nitrogen purity of 99.5%.     

变压吸附制氮技术及其应用

主要介绍了上海化工研究院变压吸附制氮技术的基本原理及工艺特点,并简要介绍了其应用实例。     

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.     

Carbon molecular sieves for gas separation processes

The development and commercialization of carbon molecular sieves (CMS) are closely connected with the development of pressure swing adsorption (PSA) processes for the separation of gases. It was already known in the 1960s that certain carbonaceous materials have a molecular sieving effect similar to that of the well known zeolitic molecular sieves. The effect was observed during basic research on anthracite and bituminous coal which are both known to be porous. However, the separation effect, e.g. for oxygen/nitrogen, was very small. It was not until the 1970s that large-scale production of uniform quality CMS suitable for commercial application in PSA processes was established. Nowadays, different types of CMS are successfully used in PSA plants, e.g. for the generation of nitrogen from air, for the production of methane from biogases, and for the recovery of hydrogen from coke oven and steam reforming gases^1–4.     

Nitrogen generation by pressure swing adsorption based on carbon molecular sieves

Pressure swing adsorption (PSA) processes based on carbon molecular sieves have been known for more than twenty years. The most important industrial PSA process, the nitrogen PSA process, has been developed during the last ten years into a highly efficient technique for producing nitrogen on site. Nitrogen is currently produced by PSA with impurities down to the ppm level and at flow rates up to 1500 N m³ h⁻¹. The on-site supply of nitrogen using the PSA process is an alternative to cryogenic nitrogen. An overview of the theoretical background, of industrial units including purification by deoxo systems and of the economy of the nitrogen PSA system is presented.     

变压吸附空分制氮过程的研究

建立了一套中试装置 ,对以商业炭分子筛为吸附剂的变压吸附 (PSA)空分制氮循环过程进行了系统研究 .用所建立的数学模型对相应实验进行模拟并将模型预测与实验数据进行比较 ,结果表明模型是可靠的 .     

成熟技术的结合——林德合成氨新概念流程

ＬＡＣ工艺提出了合成氨的简化流程，其装置是由ＰＳＡ制氢装置、氮气装置和高效氨合成装置组成。ＬＡＣ工艺的特点是高弹性、短施工期、低投资及有副产品     

PSA法低露点氮气装置在HTV硅橡胶生产中的应用

介绍了变压吸附法制低露点氮气的基本原理及在热硫化硅橡胶生胶生产中的应用。