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《化工经济技术信息》2007,(9):9-9
抚顺市天赋化工制造有限公司和沈阳工业大学联手,开发成功拥有自主知识产权的环戊醇生产新工艺。该工艺采用固定床连续生产线,原料转化率高于99%,催化剂选择性大于99%,产品纯度超过99.8%,且生产过程中无废水排放,不产生环境污染。[第一段] 相似文献
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高盐难生化制药废水工程实例 总被引:1,自引:0,他引:1
蒸馏-UASB-深层曝气.兼氧-A/O接触氧化处理制药废水,BOD5和COD的去除率分别达到995%和99.8%,出水达到《山东省小清河流域水污染物综合排放标准》(DB37/656-2006表2)一般保护区域最高允许排放浓度要求。工程对含盐废水、难生化废水、综合废水进行分步治理,经过一年多的运行表明,该工艺运行稳定,处理效果好,为此类废水提供参考。 相似文献
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以硫铁矿烧渣为原料,经适当处理制取浇渣净水剂(SFAS),对选磷废水有较好的净化效果。其COD、SS去除率分别为77.1%和99.75%。 相似文献
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分别测定了煤气化合成气在纯水以及两种不同浓度(6%(mol)和5%(mol)的四氢呋喃(THF)水溶液中的水合物生成条件,实验结果表明THF的加入可以大大降低合成气生成水合物的压力,使合成气能够在较低的压力下通过生成水合物的方法得到分离,同时也为该分离方法应用于实际工业装置提供了可行性。研究还成功地将Chen-Guo水合物热力学模型应用到含有一氧化碳气体的水合物生成条件的预测,并对合成气在纯水中不同温度下生成水合物的压力进行了计算,与本次实验值比较,得到平均误差为8.64%,肯定了实验结果的准确性。在此基础上,选定在5%(mol)THF水溶液中,气液比为100:1,反应压力为5MPa(绝)的条件下,分别进行反应温度为279.15K、281.15K、283.15K、284.15K和285.15K的水合物法分离合成气实验,提浓其中的氢气和一氧化碳。实验结果表明,284.15K时,氢气的回收率达到79.8%,氢气和一氧化碳的总回收率为76.0%,分离后二者总的体积百分含量由原料气中的88%提高到93%,分离效果较为满意。 相似文献
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CO2-N2-TBAB和CO2-N2-THF体系的水合物平衡生成条件 总被引:3,自引:0,他引:3
利用等温压力搜索法测定了CO2-N2-TBAB与CO2-N2-THF体系的水合物平衡生成压力. 实验的压力范围为0.69~14.55 MPa,温度范围为275.75~288.15 K. 结果表明,TBAB与THF均可作为添加剂有效降低气体水合物的平衡生成压力. 在较低的药剂浓度下,CO2-N2-TBAB的水合物平衡生成压力低于CO2-N2-THF体系. 在较高的浓度下,两种体系的水合物平衡生成压力没有明显差别. 相似文献
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针对复杂废水和高盐废水的处理是目前废水处理领域的难点,常规废水处理技术具有操作复杂、能耗高等问题。本文提出了一种基于水合物处理实际复杂废水及高盐废水的新方法,通过测定水合物分解水中污染物浓度,证实了该技术的可行性。实验中结合中国石化镇海炼化分公司的石油炼化废水和大连市水文局的高浓度实验室废水,在常压、275.15K下进行实验,通过测量水合物法废水处理的脱除效率、产水率及富集因子,评估R141b水合物对废水的处理效果。测定废水处理前后的电导率、总有机碳(TOC)及离子浓度反映对不同种类污染物的去除能力。采用真空抽滤结合离心分离的方法作为后处理方法,提高废水中污染物的脱除效率。结果表明,水合物法废水处理技术可同时去除废水中的无机盐及有机污染物,各污染物的脱除效率可达75%以上,产水量可达78.9%,对高浓度的实验室废水中的铜离子脱除效率达到90.8%。 相似文献
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加入添加剂降低水合物生成压力是当前水合物法分离混合气体研究热点。本研究以水的逸度模型为基础, 结合PRSV2 状态方程研究了CH4、O2、N2 及其混合气体水合物在纯水体系下的相平衡条件;通过UNIFAC 基团 贡献法对添加剂四氢呋喃(THF)水溶液进行基团划分,计算该体系下液相各组分的活度,理论研究了添加剂 THF 对气体水合物相平衡条件的影响;结果表明在相应的温度范围内,与其他模型相比,在纯水体系下该模型 预测精度较高,在THF 水溶液体系下该模型对单组分和双组分气体的预测精度平均相对误差在7%左右,随着 THF 浓度增加,气体水合物相平衡压力的降低幅度减小;当THF 摩尔分数达到6%时,对气体水合物相平衡影 响达到最大。相关研究结果为混合气体的大规模工业提纯分离提供了理论基础。 相似文献
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Marvin Ricaurte Jean-Philippe TorréJoseph Diaz Christophe Dicharry 《Chemical Engineering Research and Design》2014
This paper investigates an original method to efficiently trigger gas hydrate crystallization. This method consists of an in situ injection of a small amount of THF into an aqueous phase in contact with a gas-hydrate-former phase at pressure and temperature conditions inside the hydrate metastable zone. In the presence of a CO2–CH4 gas mixture, our results show that the THF injection induces immediate crystallization of a first hydrate containing THF. This triggers the formation of the CO2–CH4 binary hydrate as proven by the pressure and temperature reached at equilibrium. This experimental method, which “cancels out” the stochasticity of the hydrate crystallization, was used to evaluate the effect of the anionic surfactant SDS at different concentrations, on the formation kinetics of the CO2–CH4 hydrate. The results are discussed and compared with those published in a recent article (Ricaurte et al., 2013), where THF was not injected but present in the aqueous phase from the beginning and at much higher concentrations. 相似文献
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Hiroki Yoshioka Masaki Ota Yoshiyuki Sato Masaru Watanabe Hiroshi Inomata Richard L. Smith Jr. Cor J. Peters 《American Institute of Chemical Engineers》2011,57(1):265-272
Decomposition kinetics and recycle of hydrogen–tetrahydrofuran (H2–THF) clathrate hydrates were investigated with a pressure decay method at temperatures from 265.1 to 273.2 K, at initial pressures from 3.1 to 8.0 MPa, and at stoichiometric THF hydrate concentrations for particle sizes between 250 and 1000 μm. The decomposition was modeled as a two‐step process consisting of H2 diffusion in the hydrate phase and desorption from the hydrate cage. The adsorption process occurred at roughly two to three times faster than the desorption process, whereas the diffusion process during formation was slightly higher (ca. 20%) than that during decomposition. Successive formation and decomposition cycles showed that occupancy seemed to decrease only slightly with cycling and that there were no large changes in hydrate structure due to cycling. Results provide evidence that the formation and decomposition of H2 clathrate hydrates occur reversibly and that H2 clathrate hydrates can be recycled with pressure. © 2010 American Institute of Chemical Engineers AIChE J, 2011 相似文献
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Microfiltration carbon membranes were developed to cope with the wastewater containing phenol and phosphoric acid. The structure of carbon membranes was characterized by scanning electron microscope, x-ray diffraction, bubble pressure method and specific surface area analysis. The separation efficiency of carbon membranes was investigated by varying the operation factors, including feed concentration, running time, and pressure. Results have shown that the carbon membranes are abundant in porous structure with the porosity of 42%, along with a narrow pore size distribution centering at 0.18?µm. Within the scope of the study, the highest removal rates reach to 81.9% for phenol and 55.3% for phosphoric acid from wastewater, respectively. 相似文献
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采用二次生长法,在无有机模板剂的条件下于a-Al2O3载体上制备丝光沸石膜. 所制丝光沸石膜用于四氢呋喃(THF)水溶液脱水浓缩,考察了操作温度、THF浓度对其渗透汽化性能的影响. 结果表明,在操作温度为60℃、THF浓度为90%(w)时,丝光沸石膜的渗透通量和分离因数分别为0.35 kg/(m2×h)和9233,渗透液水含量达99.907%(w). THF浓度在75%~97%范围内,渗透液的水含量均在99.6%以上. 对THF浓度为97.066%(w)的模拟制药废液脱水37 h后,THF浓度达99.640%. 相似文献