深度学习辅助柠檬渣解析Cu2+的研究

为了对吸附Cu²⁺的柠檬渣进行解析的相关研究。实验主要考察解析时间、解析温度和解析次数对解析率的影响，在单因素基础上利用L₉(3⁴)正交实验，以期得到解析的最优组合和因素的主次关系。通过深度学习得到回归方程，预测最优组合与解析率，并与正交实验结果进行比较。结果表明柠檬渣解析Cu²⁺的最优工艺条件为：解析时间为36 min、解析温度为36℃、解析次数为3次。回归方程预测的最优工艺条件和解析率与正交实验的分析结果基本一致。     

中药专业波谱解析教学改革探讨

结合中药专业波谱解析课程特点,通过及时引入最新研究成果、结合中药化学结构解析的教学方式、综合解析能力的提升等方式探讨波谱解析教学改革,训练学生的运用波谱解析解决中药学相关结构的实际能力,使学生专业综合能力得到提高。     

盐酸解析工艺路线的比较

主要介绍了盐酸常规解析,稀盐酸萃取精馏、变压精馏,盐酸一步解析等解析路线工艺流程、原理。比较了在投资,消耗指标,优劣和运行方面的情况。指出盐酸常规解析是最经济性的工艺,各企业应根据自身情况选择适合自己的盐酸解析路线。     

K-401解析气压缩机喘振原因分析及预防措施

本文分析了K-401解析气压缩机喘振产生的原因,论述了喘振对K-401解析气压缩机的危害,根据K-401解析气压缩机的运行经验,找出防止K-401解析气压缩机产生喘振的预防措施。     

孟莫克公司深度水解技术应用分析

1传统的水解解析工艺碳铵液由解吸泵送至解吸换热器与来自解析塔底部的废液进行热交换后进入解析塔上部,经塔盘蒸馏后,塔顶得到的NH₃-CO₂-H₂O混合气体进入解析冷凝器冷凝,冷凝液返回解析塔塔顶作为回流液,气相去二循一冷凝器。解析塔底部的废液经解吸换热器回收热量后,排往污水处理装置。     

盐酸零解析研究及工业化

介绍了盐酸零解析小试及盐酸零解析工业化生产的情况,盐酸零解析对水资源平衡及清洁生产提供了可靠的保证,同时在不增加投资的情况下提高了聚氯乙烯的产量。     

基于Hash散列的SCPI命令解析机制在LXI仪器上的实现

在ARM & Linux嵌入式平台下,完成LXI仪器程控命令的发送.通过单向散列函数MPQ和Fibonacci函数构建分配较为均匀的散列表；采用链式的开散列结构,多值校验的冲突解决机制有效减小了冲突发生的可能；给出了SCPI命令解析中关键字节点和参数解析的实现方法；最后给出了一个LXI数字化仪命令解析的例子.该命令解析机制有较小的时间复杂度、高效的解析效率和较好的通用性.     

不同型号大孔树脂对苹果多酚物质的吸附特性

通过进行静态和动态吸附实验,研究了不同型号大孔树脂对红富士苹果多酚的吸附特性。各型号大孔树脂的静态与动态吸附性能及解析率不同,但差异不显著(p0.05),且吸附及解析规律基本一致,其吸附及解析性能顺序为XDA-5AB-8D-101XDA-7;XDA-5大孔树脂静态和动态吸附性能和解析性能均最好,其静态解析率和动态解析率分别达(69.281±0.214)%和(73.585±0.499)%;XDA-5大孔树脂对苹果多酚的静态和动态吸附性能均比其他类型树脂好,且XDA-5对苹果多酚的动态吸附的吸附量和解析率均较静态吸附更高。     

径向基函数网络在大气颗粒物来源解析中的应用

将径向基函数网络(Radial Basis Function Network,RBFN)应用于城市环境颗粒物来源解析工作.模拟数据计算的解析结果表明:RBFN可以实现对多源(14个可能源,其中13个为有效源)的解析,在5%～15%的源和受体测量误差的情况下,对于分担率大于15%的主要源,其解析结果与真实值的相对误差均不高于5%;对于分担率大于5%的源,其解析相对误差均低于15%.RBF网络可以很好地识别无效源.因此,在充分掌握可能污染源成分谱信息的基础上,该方法具有源解析应用潜力.     

广州市环境空气PM_(2.5)来源解析业务化设计及实现

为定量解析PM_(2.5)的来源,广州市于2013-2014年开展了环境空气PM_(2.5)来源解析工作,2015年开始PM_(2.5)来源解析工作实现常规业务化。PM_(2.5)源解析业务化的开展需要科学合理的设计,使解析结果能够具有代表性。系统总结广州市PM_(2.5)来源解析业务化工作经验,介绍了技术路线、点位选取、采样时段设置、滤膜和采样器的选择、分析方法以及模型分析等业务化的设计和实现,旨在能为业务化开展PM_(2.5)来源解析提供技术参考。     

基于水全循环的尾氯脱吸工艺

(接上期)从氯化氢气体合成的角度看,在尾氯脱吸系统中,由于工艺设计为防止泡罩塔在吸收氯化氢尾气时顶部产生酸雾,提高氯化氢气体的吸收率,采用吸收水(软水)进行喷淋吸收,这部分水最终以浓盐酸的形     

基于水全循环的尾氯脱吸工艺

介绍了尾氯脱吸工艺在PVC生产中的应用情况及存在的问题。结合PVC水碱洗工序生产装置的特点,提出了水平衡的观点。设计了基于水全循环的尾氯脱吸工艺。初步探讨了水循环尾氯脱吸工艺的操作运行。     

盐酸深度脱吸装置在PVC生产中的应用及改进

介绍了盐酸深度脱吸的原理与工艺流程及其在PVC生产中的应用,总结了盐酸深度脱吸工艺与设备的改进措施。     

化学吸收法CO2捕集解吸能耗的分析计算

推导出了化学吸收法CO2捕集工艺解吸总能耗的准确计算公式,根据年产量100万吨CO2的捕集工艺流程的节点参数,分析计算了解吸能耗中各项能耗的大小,并与Leites、晏水平、王海波等能耗估算公式结果进行了对比。分析表明,本文推导的能耗计算公式适用于设计后或运行时的能耗计算,在捕集工艺设计前可采用Leites、晏水平、王海波等公式估算解吸能耗。其中晏水平公式考虑了循环倍率,因此能耗估算公式的适用性强,循环倍率和比热容取值偏差不大时,估算精度较高。通过对推导出的解吸能耗公式的分析,即使吸收剂质量浓度、溶液的再生度、贫富液换热器的性能一定,仍能进一步降低解吸总能耗,并提出了进一步降低解吸总能耗的有效措施。     

Adsorption of Volatile Organic Compounds on Soil and Prediction of Desorption Breakthroughs

Abstract

Vapor extraction of volatile organic compounds from soil was investigated by performing adsorption and desorption experiments of trichloroethylene, trichloroethane, and chlorobenzene on soil particles. The adsorption breakthrough curves were obtained using a dynamic response technique based on frontal analysis chromatography. The shape of the breakthrough curves indicated that the adsorption process was close to an ideal adsorption system of no mass transfer resistance, no axial dispersion, and infinitesimal width of mass transfer zone. The adsorption isotherms were BET Type I for trichloroethylene and trichloroethane, and BET Type II for chlorobenzene. Two types of desorption profiles were observed depending on the compounds, i.e., the continuously decreasing profiles of trichloroethylene and trichloroethane and the stepwise decreasing profiles of chlorobenzene. The desorption profiles of trichloroethylene and trichloroethane were simulated using a local equilibrium theory which indicated that desorption behavior was independent of the number of adsorption layers on soil. For chlorobenzene, the monolayer desorption was the rate-controlling step of the overall desorption process. The effect of moisture on desorption efficiency was significant for chlorobenzene, which showed more unfavorable desorption behavior than trichloroethylene and trichloroethane.     

粗氯乙烯气体中HCl吸收工艺比较

介绍了转化后粗氯乙烯气体中HCl的3种吸收工艺,并对这3种工艺在设备、材质、吸收温度、盐酸浓度、碱耗、检修频次及是否适宜使用常规解吸、深解吸酸循环吸收工艺等方面进行了比较。结果表明:采用组合塔→(水洗塔)→碱洗塔(配套常规解吸或深解吸)工艺的效果最好。     

THERMODYNAMIC ANALYSIS OF THE SORPTION PROCESS OF MESQUITE GUM

Determination of the thermodynamic parameters, allows for a more thorough interpretation of sorption isotherms and provides a better insight into sorption mechanisms. In this work, the adsorption and desorption isotherms of mesquite gum were determined at 25, 35 and 45 degrees C. All isotherms were fitted using the GAB model and the thermodynamic properties were estimated by Othmer's method. The hysteresis decreased when temperature increased. However the effect of temperature was higher on the desorption isotherms, indicating the existence of metastable states. The adsorption process showed smaller enthalpy values during the hysteresis as compared to desorption process. The minimum integral entropy for the adsorption and desorption was located around 14 gH2O/100 g dry solids. This suggests that it is possible to determine the most suitable conditions for storage, using adsorption or desorption isotherms.     

CONTINUOUS PRODUCTION OF DISSOLVED OXYGEN-FREE WATER USING RAMOND SUPERMIXER®

The process of continuous production of dissolved oxygen free water was investigated by means of desorption of dissolved oxygen into fine nitrogen bubbles generated in a novel motionless mixer named Ramond Supermixer® (RSM). The pressure drop across the mixer (ΔP_SM) and the volumetric mass transfer coefficient (k_La) during the desorption of oxygen from water were measured for various combinations of process variables; liquid and gas velocities and number of mixing units. The k_La during absorption was smaller by less than approximately 6% than that during desorption. Specific gas-liquid interfacial areas (a) were measured by the chemical absorption method for a CO₂-aqueous sodium hydroxide solution system. Such process characteristics as ΔP_SM, k_La, and a were correlated with the process variables and compared with those available in the literature. To further confirm the mass transfer characteristics in RSM, the desorption of oxygen from aqueous electrolyte solutions was also investigated. All the correlations obtained for k_La during the desorption of oxygen from water and aqueous electrolyte solutions were compatible to a great higher extent.     

大孔吸附树脂纯化草木樨香豆素的动力学和热力学

通过静态吸附和解吸实验筛选出纯化草木樨香豆素的大孔吸附树脂,确定了HPD300树脂纯化香豆素的吸附动力学模型、等温吸附模型和热力学参数,并通过动态吸附和解吸实验优化其工艺条件。结果表明:HPD300树脂对香豆素的吸附量大、解吸率高、吸附速度快,其吸附动力学可用拟二级动力学方程很好地描述,等温吸附过程可用Langmu ir方程较好地拟合,其吸附是一个自发、放热的物理吸附过程,在优化的条件下产物中香豆素的纯度大于90%,回收率高于90%。研究表明:HPD300树脂是一种分离纯化草木樨香豆素的理想树脂,可用于大规模分离纯化草木樨香豆素。     

Desorption Behaviour of Regular Adsorbed Polyampholytic Layers

The desorption behaviour of the diblock polyampholyte PMAA-b-PDMAEMA, poly(methacrylic acid)-block-poly((dimethylamino)ethyl methacrylate), preadsorbed on silicon substrates was investigated under the influence of several desorption agents. The investigated polyampholyte is known to adsorb in regular structures directly from aqueous solutions onto silicon substrates. While the adsorption process is mainly determined by electrostatic interactions, two kinds of desorption mechanism should be assumed. The first mechanism is based on changed electrostatic conditions caused for instance by a strong change in pH of the aqueous solution. The other mechanism is observed after treatment with hydrophobic organic solvent, which leads to the desorption of hydrophobic adsorbed polyampholyte chains, while the electrostatically attached ones will not be influenced. To complete the desorption experiments with organic solvents also adsorption experiments from analogous polyampholytic solutions in the same organic solvents were performed. The amount of polymer at the substrate surface after adsorption or desorption experiments was determined using ellipsometry. Atomic force microscopy (AFM) was used to investigate the surface topography of dried samples after the desorption process.