氯乙烯精馏尾气回收工艺改进的初探

分析了氯乙烯精馏尾气回收工艺存在的问题，在变压吸附制N2，H2工艺原理的启示下，对该原理应用于氯乙烯精馏尾气回收工艺的研究进行了初探，取得了满意结果。     

氯乙烯聚合尾气回收工艺的改进

介绍了一种简单的氯乙烯聚合尾气回收的工艺,将氯乙烯聚合反应后产生的尾气引至氯乙烯合成和精馏工序,通过合成工序的碱洗塔除去影响生产和产品质量的杂质,利用精馏工序的变压吸附装置,吸附回收氯乙烯单体和排放氮气等杂质气体,工艺流程简单,建设投资小,可降低生产成本,实现清洁生产。     

3种氯乙烯精馏尾气回收工艺的分析比较

介绍了聚氯乙烯树脂生产过程中氯乙烯精馏尾气产生的工艺,并对使用的3种氯乙烯精馏尾气回收工艺进行了分析比较.     

膜法回收精馏尾气中氯乙烯单体

阐述了膜法回收氯乙烯的基本原理以及回收过程，并探讨了膜材料的选择以及膜两侧的压力比对膜分离效果的影响。采用膜法氯乙烯回收系统，从精馏尾气中回收的氯乙烯达90％以上。二次尾排中的氯乙烯含量在2％以下。     

氯乙烯精馏尾气回收工艺

通过对氯乙烯精馏尾气回收工艺的对比 ,提出一种更合理的回收工艺 :在回收进料尾排 (一次尾排 )时 ,采用活性炭吸附 ,而回收低塔尾气 (二次尾排 )时经缓冲罐后再进入转化器 ,对乙炔进行二次转化回收 ,采用该技术每年 (在 3万t/a装置上 )相当于回收氯乙烯约 32 0t,增加效益 96万元 ,并减少了压缩、精馏、冷冻的负荷     

电石法氯乙烯精馏尾气回收工艺技术进展

从电石法氯乙烯精馏尾气的回收技术现状出发，简要介绍了尾气回收技术的发展状况，并总结了部分回收技术的工艺过程、处理效果及优缺点。     

变压吸附装置在氯乙烯尾气回收中的应用

介绍了变压吸附装置在氯乙烯尾气回收中的原理,阐述了对氯乙烯尾气回收系统的工艺调整。通过调整,回收装置运行稳定、操作简便,产品气的质量满足转化装置的要求,取得了显著的经济效益和社会效益。     

采用变压吸附技术回收氯乙烯精馏尾气

介绍了变压吸附回收氯乙烯精馏尾气新工艺,并与活性炭吸附回收工艺进行了比较,实际运行效果表明该工艺运行稳定、操作简便,具有PLC系统自动控制、安全性能等特点。氯乙烯、乙炔回收率均达到99．9％,排放尾气中氯乙烯质量浓度小于36mg／m3,乙炔质量浓度不大于150mg／m3,消耗大幅降低,在任何负荷下,装置都能稳定运行,经济和社会效益显著。     

变压吸附氯乙烯精馏尾气工艺改进

介绍了变压吸附氯乙烯精馏尾气的工艺改进情况,改进后的工艺采用分路回收方法,实现了氯乙烯、乙炔和氢气的分别回收,该工艺运行平稳,可降低转化系统负荷,且氯乙烯和乙炔均达到了零排放,具有一定的经济效益和环境效益。     

对氯乙烯单体精馏尾气中的乙炔进行回收利用

本文探讨了氯乙烯单体生产过程中对精馏尾气中乙炔的回收工艺方法，以提高乙炔的总转化率。     

Hydroliquefaction of Wyodak coal using bottoms recycle

Wyodak coal has been liquefied using recycle solvents consisting of blends of Wyodak coal-derived distillates and SRC or SRC oils, asphaltenes and oils plus asphaltenes. Whilst the quality of the distillate portion of the bottoms recycle is maintained by hydrogenation and distillation in the Exxon Donor Solvent (EDS) process, no reported efforts have been made to hydrogenate the nondistillable portion of the EDS bottoms recycle solvent nor the bottoms recycle solvent in the SRC-II process. As hydrogenation of the distillate portion of the recycle solvent in the EDS process increased Wyodak coal distillate yields, this study was initiated to determine whether hydrogenation of the nondistillable portions of Wyodak coal-derived bottoms recycle solvent would show similar beneficial effects. Results suggest that distillable liquid yields in the range of 55–60 wt% of dry Wyodak coal can be obtained using mildly hydrogenated SRC or SRC oils plus asphaltenes as a bottoms recycle solvent component. This result can be compared to distillable liquid yields of 40 wt% of dry, Wyodak coal obtained from the EDS process using bottoms recycle. Further, the unhydrogenated, SRC-derived oil and asphaltene portions of the recycle solvent also appear to be effective solvent components. However, the most effective solvents were obtained using hydrogenated SRC or SRC-derived oils plus asphaltenes.     

采用硫铵循环法生产硝酸磷肥的可行性分析

对混酸法与硫铵循环法生产硝酸磷肥进行对比分析，后者实现了废渣，废水的零排放，降低了硝酸硝肥的生产成本，同时还对硫铵循环法进行了试验，并得出了合适的工艺条件。     

UTI工艺的热力学分析(待续)

介绍目前我国水溶液全循环工艺所面临的困境,UTI技术的由来、技术特点,说明UTI工艺是改进水溶液全循环技术的最佳选择。并对UTI关键工序进行热力学分析和讨论,探讨其原理及技术核心,诠释UTI工艺的技术真谛。     

草甘膦生产中节能降耗工艺的改进

对草甘膦生产中三乙胺回收工艺改进后 ,可节省三乙胺单耗 8kg ,塔顶回收率达 98%。将蒸发浓缩工艺的设备材质由不锈钢改为碳钢 ,并取消真空泵和循环泵 ,从而简化工艺、节约投资。     

有效微生物接种和渗滤液循环回流对垃圾降解的影响

Biodegradation of waste in landfill is a slow process requiring decades for completion. Accelerated degradation of municipal refuse in modulated landfill environments may alleviate or eliminate pollution to the land, water and air. In this work, nineteen effective microorganisms (EMs) were isolated from old landfill refuse by enrichment culturing techniques and used for the inoculum of municipal refuse. The preliminary experiments demonstrate that a combination of EMs inoculation in landfill with leachate recycle resulted in increased rates of decomposition and faster process stability. The concentrations of COD, VFA and SO4^2- in digester with EMs inoculation and leachate recycle decreased more rapidly than others. Gas production from digester with EMs inoculation and leachate recycle commenced around 32 days, which is a week shorter than with leachate recycle only. And peak cumulative gas production was obtained much earlier in digester with EMs inoculation and leachate recycle (150 days) compared to 180 days with leachate recycle only. Moreover, in the first two months, the rate of settlement in digester with EMs inoculation and leachate recycle was more rapid than others.     

废旧聚四氟乙烯的回收方法及应用

介绍了废旧聚四氟乙烯产生的原因及数量；探讨了回收利用的目的和意义。对目前国内外废旧聚四氟乙烯的回收利用的原理、方法做了比较详细的讨论；并对今后废旧PTFE的回收利用提供了一些建议和前景分析。     

基于ASPEN PLUS软件的甲烷化工艺模型

利用ASPEN PLUS对煤制天然气的甲烷化工艺进行了流程模拟。模型模拟得到了替代天然气成分、反应器出口温度、循环比、分流率,揭示了循环比和分流率对反应器出口温度的影响。通过该模型,能够为工艺方案比选、优化设计提供模拟和预测。     

A stepwise optimal design of water network☆

In order to take full advantage of regeneration process to reduce fresh water consumption and avoid the accumu-lation of trace contaminants, regeneration reuse and regeneration recycle should be distinctive. A stepwise opti-mal design for water network is developed to simplify solution procedures for the formulated MINLP problem. In this paper, a feasible water reuse network framework is generated. Some heuristic rules from water reuse net-work are used to guide the placement of regeneration process. Then the outlet stream of regeneration process is considered as new water source. Regeneration reuse network structure is obtained through an iterative optimal procedure by taking the insights from reuse water network structure. Furthermore, regeneration recycle is only utilized to eliminate fresh water usage for processes in which regeneration reuse is impossible. Compared with the results obtained by relevant researches for the same example, the present method not only provides an appro-priate regeneration reuse water network with minimum fresh water and regenerated water flow rate but also sug-gests a water network involving regeneration recycle with minimum recycle water flow rate. The design can utilize reuse, regeneration reuse and regeneration recycle step by step with minor water network structure change to achieve better flexibility. It can satisfy different demands for new plants and modernization of existing plants. ? 2016 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. Al rights reserved.     

Supercritical fluid recycle for surge control of CO2 centrifugal compressors

This paper presents computer-based design and analysis of control systems for centrifugal compressors when the operating fluid is supercritical CO₂.It reports a non-linear dynamic model including a main forward compression line and two different configurations for the recycle antisurge line. Disturbance scenarios are proposed for testing the configurations and performance indicators are suggested to evaluate control performance and power consumption of the compression system.The paper demonstrates that compared to the hot recycle, the process configuration including a cold gas recycle has better overall stability, but higher power consumption and lower values for the control performance indicators. Based on the previous considerations, the paper gives suggestions regarding the choice of the recycle configuration. Moreover it compares subcritical and supercritical compression during surge prevention and highlights the importance of the selection of the gas recycle configuration when full recycle is needed.     

氯油生产尾气中氯乙烷的回收

研究了溶剂低温吸收法回收氯油生产尾气中氯乙烷的新工艺。氯乙烷收率可达84%以上,远远高于国内同行业的收率水平。