PSA变压吸附制氢吸附剂分子筛粉化原因分析

介绍了变压吸附制氢工艺特点和分子筛粉化后的主要现象,并对引起分子筛粉化的5个因素进行了分析和讨论。     

PSA-H_2装置分子筛粉化原因分析及解决措施

分析变压吸附制氢装置运行过程中分子筛粉化的原因,提出解决措施与改进建议。     

子午线轮胎氮气硫化新技术和轮胎氮气硫化变压吸附法供氮系统项目通过鉴定

2006年4月30日,北京合众创业技术有限公司开发的子午线轮胎氮气硫化新技术和轮胎氮气硫化变压吸附法供氮系统项目在北京通过中国石油和化学工业协会组织的鉴定。子午线轮胎氮气硫化新技术项目是用蒸汽和氮气硫化工艺取代蒸汽和过热水硫化工艺。鉴定认为,采用该项目技术和设备有利于提高硫化效率、节约能源、降低生产成本和提高子午线轮胎产品质量;该项目技术和设备完整、成熟,创新性强,达到国际先进水平。轮胎氮气硫化变压吸附法供氮系统项目研制了专用于轮胎氮气硫化的PSA4009999变压吸附法制氮装置,该装置所用空气与所产氮气体积比为4.8…     

PSA变压吸附分子筛粉倾原因分析

我公司甲醇车间采用合成氨弛放气中的氢气作原料。 1 987年甲醇装置投产时制氢采用的是西南院 PSA所的四塔一均 PSA工艺 ,两套处理量为 3 0 0 0 m3 /h。 1 993年根据实际生产的需要 ,由西南化工研究院变压吸附研究所设计改造成了处理量为 70 0 0 m3 /h的八塔三均工艺 (也可切换成A、 B两个处理量为 3 5 0 0 m3 /h的四塔二均单系列操作 )。同时八个吸附塔内的吸附剂也由青岛的球状 5 分子筛全部更换成上海环球联碳 (UOP)分子筛公司的条状分子筛。但是 PSA在 1 993年 1 1月改造完仅仅投运了一个多月分子筛就出现大量粉化现象 ,我们随即…     

斜交轮胎的氮气硫化

利用测温仪测定斜交轮胎过热水硫化和氮气硫化关键点的等效硫化时间及温度,控制轮胎关键点的最高温度,确定适合斜交轮胎的氮气硫化工艺条件。对比斜交轮胎过热水硫化和氮气硫化成品轮胎的速度性能和耐久性能,结果表明,氮气硫化的斜交轮胎各项性能均满足企业标准,速度性能和耐久性能优良。     

PSA装置吸附剂粉化分析及处理方法

针对大唐内蒙古多伦煤制烯烃项目中PSA氢回收装置吸附剂粉化的问题,进行了细致分析,并探讨了相应的处理措施,介绍了改造效果。为石油化工、煤化工装置中PSA氢回收装置吸附剂可靠运行提供宝贵经验。     

新型氮气硫化专用制氮装置

北京合众创业技术有限公司研制的用于子午胎氮气硫化PSA-400-9999变压吸附制氮装置，最近在安徽佳通轮胎有限公司通过验收。     

等效硫化在轮胎蒸汽/氮气硫化中的应用

采用WL-IV型硫化测温仪，对轮胎硫化过程中的各部位的硫化温度进行测定。对轮胎蒸汽，氮气硫化过程的等效硫化问题进行了分析研究，提出了相应的硫化条件。     

载重子午线轮胎氮气硫化工艺

介绍载重子午线轮胎氮气硫化的基本原理及氮气硫化工艺,分析氮气泄漏和硫化胶囊上下温差过大等氮气硫化工艺问题的产生原因,并采取相应的改进措施。改进后氮气平均泄漏速率为0.02MPa·min-1,温差由原来的近30℃降低到8.4℃,改进效果明显。     

斜交轮胎氮气硫化工艺的研究

研究氮气硫化工艺在斜交轮胎中的应用。结果表明：与过热水硫化工艺相比,氮气硫化工艺过程简化,等效硫化时间缩短,硫化效率提高;斜交轮胎采用氮气硫化工艺,成品轮胎安全性能提高,同时可以降低生产成本,延长硫化胶囊使用寿命,生产更安全,环境更清洁。     

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。     

The mass transfer zone in nitrogen PSA columns

Direct measurements of the gas phase composition within a laboratory-scale N₂ pressure swing adsorption (PSA) bed operating at cyclic steady state were made. The objective of this work was to study the shape and movement of the mass transfer zone (MTZ) within a kinetics-based PSA system. The results of this study confirmed model predictions that the MTZ spans a large portion of the bed under favourable operating conditions. The shape of the MTZ during the adsorption step changes from concave upwards to ’s’ to concave downwards with time. Maximum air recovery tends to occur if the feed step is stopped just after the MTZ turns to concave downwards. The experimental results also revealed an important and beneficial role the pressure equalization step plays in the establishment of the solid phase MTZ.     

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%.     

CMS+ZMS二级变压吸附制纯氧的优化研究

文利用电路网络模型对变压吸附制氧工艺流程模拟并优化操作参数后,用碳分子筛吸附空气中大部分的Ar和N2,解吸出的大约70%左右的氧气作为沸石分子筛单元的进料气,在沸石分子筛中除去余下的N2,即可得到产品回收率为28.4%,浓度为99.06%的纯氧。通过模拟发现,在保证氧气纯度的前提下,通过筛选工艺流程,优化阀系数、操作时间、吸附和脱附的压力,从而提高氧气回收率,降低了制纯氧的成本。     

甲烷氯化物生产及市场分析

综述了国内外甲烷氯化物(CMS)的生产和市场情况,并对未来的发展作了预测。CMS在发达国家的消费总体呈衰减趋势,但在发展中国家的消费增长很快。近年来我国CMS生产发展较快,总生产能力超过25万t/a,但消费增长更快,每年需大量进口,其中二氯甲烷市场缺口较大,其次是氯仿,一氯甲烷基本上可以满足需要,四氯化碳则应尽快被淘汰。     

喷头的雾化机理及特点分析

喷头是喷雾干燥器、喷浆造粒干燥机及某些回转窑等多种化工设备的关键部件。阐述合理地设计及选用喷头需了解各种型式喷头的雾化机理及雾化特点,才能使设备的生产能力得到提高,并分析了较常用的喷头型式的原理及特点。     

变压吸附技术在MTO脱甲烷系统中的应用性分析

针对目前Lummus和惠生的MTO烯烃分离工艺都存在尾气中乙烯损失量大,吸收剂循环量大和分离能耗高等缺陷,利用Aspen Plus 软件模拟计算了两种降低能耗成本的改进流程.本研究通过在脱甲烷系统中引入变压吸附装置,形成吸附-精馏的耦合,提高乙烯总收率的同时达到降低能耗的目的.     

Influence of nitrogen nutrition and metabolism on ammonia volatilization in plants

Barley (Hordeum vulgare L. cv. Golf) was grown in solution culture with controlled nitrogen availability in order to study the influence of nitrogen nutrition on ammonia emission from the leaves. Ammonia emission measured in cuvettes connected to an automatic NH₃ monitor was close to zero for nitrate grown plants but increased to 0.9–1.3 nmol NH₃ m^-2 leaf area s^-1 after 3–5 days of ammonium nutrition. Increasing concentrations from 0.5 to 10 mM NH₄ ⁺ in the root medium increased NH₃ emission from the shoots, root glutamine synthetase activity and NH₄ ⁺ concentrations in apoplast, xylem sap and bulk tissue, while apoplastic pH values decreased.Inhibition of glutamine synthetase in nitrate grown barley plants by addition of 1 mM methionine sulfoximine (MSO) to the root medium caused ammonia emission to increase 5 to 10-fold after 2–3 hours. At the same time shoot tissue ammonium concentrations started to increase. Addition of an inhibitor of photorespiration, 1 mM pyrid-2-yl hydroxymethane sulfonate (HPMS) reduced this increase in ammonia emission showing a relation between NH₃ emission and photorespiration.Oil seed rape (Brassica napus L. cv. Global) plants grown at 3 different nitogen levels (2N, 4N and 7N) in a sand/soil mixture showed increasing NH₃ compensation points with increasing N level. This increase was highly correlated with increasing NH₄ ⁺ concentrations in the leaf apoplast and total leaf tissue. The NH₃ compensation points could be succesfully predicted on basis of the pH and NH₄ ⁺ concentration in the leaf apoplast.     

PSA变压吸附制氮技术与低温法制氮技术比较

介绍了PSA变压吸附制氮技术和低温法制氮技术的原理、工艺流程及技术特点,并根据工程经验对2种制氮技术从技术特点、投资、占地等多方面综合比较分析,指出具体工程中2种技术的适用原则。