Modelling and evaluation of dual reflux pressure swing adsorption cycles: Part II. Productivity and energy consumption

In this second part of our dual reflux PSA study, we have examined the power and productivity tradeoffs of all of the dual reflux cycles developed in Part I. It was found that the concentration of heavy component in the feed is the primary variable that influences the choice of dual-reflux configuration. Feed to the high-pressure bed and equalisation, pressurisation and blowdown with the strongly adsorbed component is favoured at low concentrations of heavy component in the feed gas. Feed to the low-pressure bed and equalisation, pressurisation and blowdown with weakly adsorbed component is favoured for high concentrations of heavy component in the feed gas. For highly selective adsorbents, the differences between the work-productivity tradeoff curves for the four configurations are quite distinct, becoming less distinct as the ease of separation decreases.     

RELATION BETWEEN SENSORY TEXTURE PROPERTIES AND EXOPOLYSACCHARIDE DISTRIBUTION IN SET AND IN STIRRED YOGHURTS PRODUCED WITH DIFFERENT STARTER CULTURES

Set yoghurts produced with seven different exopolysaccharide‐producing starter cultures were subjected to sensory texture profiling including texture evaluation before and after a stirring procedure carried out by trained assessors. The microstructure of four selected yoghurts was investigated by confocal laser scanning microscopy with special focus on the distribution of exopolysaccharides (EPS) in the protein network. Two different types of microstructures were observed, one in which EPS were associated with the protein network and another where EPS appeared to be incompatible with the protein; as a consequence, the EPS were situated in the void spaces in the protein network. The latter yoghurts were less ropy and had higher serum separation than the yoghurts where EPS were associated with the protein, and they exhibited a significant increase in mouth thickness as a result of stirring. Yoghurts in which the EPS were associated with protein had high ropiness, low serum separation and appeared more resistant to stirring. The nature of EPS‐protein interactions is extremely important for the textural effects of EPS in fermented milk products, and such interactions depend on the specific starter culture used.     

煤矸石与煤的自动分选

介绍利用煤矸石的导磁性及色度差异对煤矸石及煤进行预选以提高煤品位的方法，重点介绍了磁电选。该方法对实现预选自动化，改善劳动条件，提高生产率，是一条有效的途径。     

医药中间体N,N-二乙基乙醇胺的合成

常压下用二乙胺溶液中通环氧乙烷的方法来合成N，N-二乙基乙醇胺，回收过量二乙胺后，蒸馏得到98％以上的产品，该路线工艺简单，收率高。     

干馏煤焦油尾气洗涤分离塔结构设计

介绍了干馏煤焦油尾气洗涤分离塔的原理和结构,分析了新设计洗涤塔的优点。     

真空带式过滤机自控系统设计和改进

本文着重介绍了根据真空带式过滤、固液分离的原理,进行自制真空带式过滤机自控系统设计和滚子电机系统的联锁。     

尼尔森离心选矿机在祁雨沟金矿采用的可行性探讨

根据尼尔森离心选矿机在国外的应用实践，结合当前国内黄金选厂粗粒金的回收生产现状，以祁雨沟金矿为例，对尼尔森离心选矿机在我国黄金选厂磨浮回路中应用的可行性进行了探讨。     

"智能型"水凝胶在生物工程和医药中的应用

就智能性水凝胶(单一响应型和双重响应型)的种类、特点进行了论述,特别对双重性水凝胶在药物释放、物料的分离(生物分子、金属离子)以及酶的固定化等方面的应用进行了综述。     

Waters ACQUITY UPC~2仪器结构和性能特点

Waters超高效合相色谱(Ultra Performance Convergence Chromatography,UPC2)技术集合SFC和UPLCTM的技术优点。泵系统的传输性能精准(精度0.001mL/min);样品室温控4~40℃,应用nano阀技术的进样器可在0.1~50μL内调控,进样线性>0.999、进样交叉污染<0.005%;色谱柱管理器可容纳并自动切换6根色谱柱,色谱柱具有eCordTM、主动预加热器功能(温控精度±0.1℃);可连接PDA、ELSD以及质谱等检测器。结合亚2μm颗粒填料技术,UPC2系统在以下应用方面分析结果优异:手性化合物、脂质、异构体、天然产物提取物等复杂体系,正相HPLC取代技术,GC、反相HPLC的正交、互补技术。     

振动流化床对细粒煤的分选试验研究

普通空气流化床主要是分选6～50 mm的粗粒煤,且取得了良好的分选效果,而对于小于6 mm的细粒煤,因其粒度不是足够大导致分选效果变差,该试验在振动流化床中引入振动能量使细颗粒处于流化状态,通过调节振动频率来实现对细粒煤的分选,当频率过大或过小时,分选效果都较差,但当频率适中时,能够较好地降低精煤灰分,提高精煤产率,达到较理想的分选效果。