变压吸附技术净化分离有机蒸气的研究进展

变压吸附(PSA)是近50年发展起来的一项用于气体净化、分离与提纯的新技术，它较低温精馏法、薄膜渗透法、化学吸收法等其他工业空分制氧方法具有自动化程度高、投资少、能耗低、安全等许多优点。工业上PSA技术最初应用于空气干燥、氢气纯化、     

PSA技术在丙烷脱氢尾气精制氢气过程中的应用

变压吸附技术,是一种新型气体吸附分离技术,因其具有能耗低、可靠性高、操作维护简便、自动化程度高和产品纯度高等诸多优点,被广泛应用于化工、能源、冶金和环境等各个工业领域。本文详细阐述了PSA技术在丙烷脱氢尾气提纯氢气工艺中的应用,说明了PSA技术在该领域应用的实用性和可靠性。     

变压吸附脱碳的开发与应用

该厂引进两套（7000m3／h与10000m3／h）PSA法脱碳装置与原有的碳化系统并联，投运3年多，显示出PSA法脱碳工艺合理，运行稳定，自动化程度高，操作、维修方便，不污染，嗓音低，能耗低（吨氨耗电250kWh，耗水6．6m3）。     

变压吸附(PSA)脱碳系统运行优化

PSA广泛应用于多种气体分离,在本装置中利用PSA脱除合成气中少量的CO2,要求产品气中CO2含量控制在较低水平以供下个工段合成气中CO的分离。在装置运行中出现产品气CO2超标的现象,通过对PSA-CO2/R脱碳装置吸附剂性能及运行操作进行分析,对PSA工艺设计及吸附剂运用提出优化建议。     

PSA装置在连续重整装置中存在的问题与解决措施

PSA单元是变压吸附装置,可将氢气提纯至99.9 V%,具有良好的可靠性以及高自动化技术及维护方便等优点,可以配合像连续催化重整这类大型产氢装置使用。PSA单元在本装置开工至今能够很好的满足装置以及全厂的生产要求,但在日常生产中也存在一些问题,本装置针对存在的问题进行跟踪处理并提出合理的解决方案。     

压敏胶研究进展

压敏胶(PSA)是在轻度施压后即可与被粘物牢固粘接的胶粘剂,广泛应用于建筑、电器、百货和医疗等领域。首先介绍了PSA特性及结构特点,然后综述了橡胶型PSA、热塑性弹性体类PSA、丙烯酸酯类PSA、有机硅类PSA和聚氨酯(PU)类PSA的研究现状,最后分析了PSA的发展趋势。     

浅析化工自动化控制的关键技术和仪表控制

化工生产过程的自动化控制能有效提升生产效率和产品质量,降低生产成本,是现代化化工企业发展的趋势。本文主要是从自动化检测与修复技术、检测模型分析技术、实时仪表监控技术出发,探索先进控制技术,探讨仪表控制的相关策略,努力提升化工自动化控制效率。     

10kV配电网馈线自动化系统控制技术分析及应用

本文介绍了10kV配电网馈线自动化系统的控制方式及应用,馈线自动化的典型控制技术方案,着重对馈线自动化控制技术方式进行了分析比较,对就地式馈线自动化重合器方式、智能分布式控制方式,以及主站监控式、子站监控式的集中式馈线自动化作了详细的论述,总结了各种馈线自动化技术方案在不同供电区域的应用。     

乳液型丙烯酸酯压敏胶研究进展

针对乳液型丙烯酸酯PSA(压敏胶)的耐水性较差、耐高温性欠佳及涂布干燥速率较慢等弊病,综述了乳液型丙烯酸酯PSA的最新研究方向及进展(包括高固含量乳液型丙烯酸酯PSA、乳液型交联丙烯酸酯PSA、低表面能材料粘接用乳液型丙烯酸酯PSA和耐水性乳液型丙烯酸酯PSA等);最后对其应用前景进行了展望。     

PSA制氢装置运行程序工艺及安全优化措施

结合PSA制氢装置实际运行及工艺操作状况,分别从PSA程序运行安全、工艺操作及优化调整等方面对原有PSA运行程序进行了部分优化,降低了PSA装置程序运行维护及工艺操作难度,提高了PSA程序故障处理工作及工艺运行效率,及PSA装置工艺运行安全水平。     

自动控制系统在PSA技术上的应用

简述了自动控制系统在变压吸附技术中的应用及发展。采用自动控制系统后,变压吸附装置运行稳定,放空气体达标排放降低了原料消耗。     

莱钢变压吸附制氢的自动控制研究

介绍了应用变压吸附(PSA)技术进行焦炉煤气制氢的工艺原理及特点.结合焦化厂的实际,设计自动控制方案,实现了变压吸附过程的多塔自动切换功能和自适应调节功能,保证制氢装置实现连续稳定的生产.     

前列腺特异性抗原体外诱导结肠癌特异性CTLs

目的检测前列腺特异性抗原(PSA)在结肠癌中的表达水平,探讨PSA作为结肠癌主动免疫治疗新靶点的可能性。方法用RT-PCR方法检测结肠癌细胞系中PSAmRNA的表达水平;免疫组织化学方法检测结肠癌细胞中PSA蛋白的表达水平。利用PAP表位肽对结肠癌患者的PBMCs进行体外诱导,ELISA法检测PSA特异性IFN-γ分泌水平;51Cr释放法检测PSA多肽特异性CTLs对结肠癌细胞的细胞毒性。结果4种结肠癌细胞(colo201,colo205,SW480和SW620)表达PSA mRNA和PSA蛋白。HLA-A+24结肠癌患者的PBMCs经体外诱导产生的CTLs可特异性杀伤HLA-A24+/PSA+的结肠癌细胞,CTLs的细胞毒活性依赖于CD8+的T淋巴细胞。结论结肠癌患者的外周血中存在PSA特异性CTLs前体细胞,PSA有可能成为结肠癌特异性免疫治疗的靶点。     

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.     

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     

变压吸附工艺多塔任意切换控制方案在OMRON中PLC控制系统上的实现

本文介绍了变压吸附制氢工艺及工艺流程自动切换控制方案在OMRON中PLC控制系统上的实施过程。工程实践证明该控制系统具有良好的可靠性。     

Crosslinked acrylic pressure sensitive adhesives. 3. Effect of adherend on film formation

The reaction of isocyanate in pressure sensitive adhesive (PSA) films adhered on to various adherends having different surface tensions was monitored by depth profiling using attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy.In the latter stages of crosslinking reaction, unreacted isocyanate and its derivatives exist more in the bulk of the PSA than in the interfaces between PSA and adherends which are Teflon sheet and PE film having relatively lower surface tensions. In the case of using stainless steel having relatively higher surface tension as adherend, opposite segregation was observed compared to Teflon and PE.From X-ray photoelectron spectroscopy (XPS), it was revealed that N atoms exist more in surface than in bulk when stainless steel is used as adherend. We conclude that polyisocyanates migrate in the PSA film in order to minimize the magnitude of interfacial free energy between the PSA and the adherend, which leads to the change of surface tension of PSA film.     

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.     

Optimal design of engineered gas adsorbents: Pore-scale level

This study presents an optimization methodology and results for the structure of gas adsorbents at a pore level by evaluating the effect of pore geometry, size and overall adsorbent porosity on ultimate working capacity of adsorbents used in pressure swing adsorption (PSA) processes. Three model pore network topologies are studied: parallel, grid-like and branched structures. These are “near” optimal structures for an adsorbent particle and their relative performance is compared in a two-step PSA cycle. The macropore network of such structured adsorbents is optimized through maximization of an objective function i.e. working capacity WC, defined as the number of moles adsorbed per unit volume of slab. Molecular and Knudsen diffusion are considered as the sole transport mechanisms in the macropore channels. An unexpected finding of this optimization technique is that the branched structure with a porosity of less than 50% represents an optimum structure with highest working capacity for the system considered. Furthermore, for faster cycles the advantage of branched structures is more obvious, reflecting the advantages of the pore network in facilitating diffusion more efficiently than other structures. A macropore channel density (defined as the density of macropores per metre of external surface) of below 10 is suggested for optimum performance for both “fast” and “slow” PSA cycles. The theoretical results of this study will be used as a priori results for the design of adsorbents at the macro-scale (bed) level.     

Various ways to control the bulk properties of pressure sensitive adhesives

The widespread industrial use of pressure sensitive adhesives (PSAs) is based on the advantage that PSAs can maintain sufficient bond strength, as well as, if needed, they can also be cleanly removed. These two essential requirements must be balanced to be a good PSA, and are not obtained without an accurate control of rheological properties. In this study, a new type of creep test is devised to measure the rheological behavior of thin film PSAs with high precision. Based on this technique, we studied four different methods to control the viscoelastic properties of PSAs. These are (1) control of the amount of crosslinking agent, (2) use of plasticizers, (3) adjustment of PSA film thickness, and, (4) construction of PSA double-layers. It was found that the levels of creep could be controlled over a wide range by adjusting the amount of crosslinking agent. Samples containing plasticizers behaved similarly to the PSAs with less amount of crosslinker (thus more mobile). The increase of film thickness also led to an increase of creep in a similar fashion as noted above. The creep behavior of the double-layer PSAs, composed of two PSA layers with different levels of crosslinking and thickness, followed a reasonable prediction: the total deformation, δ_t, was always less than the amount predicted by the two-phase model in which the limits are determined by two single layers of soft and hard PSA; however, δ_t was greater than the level of creep based on the one-phase model in which a complete mixing of crosslinker within the two PSA layers is assumed. In the last part, some characteristic creep behaviors of selected PSAs are discussed based on a linear viscoelastic model.