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气体中夹带的微小液滴和油雾难以分离是天然气生产、输送过程中的一个突出难题,本文对国内外常用的几种气液分离技术进行了比较,着重介绍高效聚结过滤分离器的结构特点、工作原理,以及在埕岛中心三号平台天然气处理橇块中的应用。现场应用结果说明采用高效聚结过滤分离器可以将气体中的液体和固体污染物脱除到检测不出来的水平。 相似文献
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《精细化工原料及中间体》2014,(6)
正德国Bokela公司提出了一种PTA提纯工艺。将粗对苯二甲酸产品溶解后结晶沉淀,在固液分离器中分离、洗涤固态的PTA产品,洗涤液同时吸收甲苯酸、羧基苯甲醛等污染物。提纯前后以及过程中,离散时间段连续测量杂质含量,最终洗涤后苯甲酸含量低于150×10-6,达标后的洗涤滤液循环 相似文献
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随着永宁油田开发进入中期阶段,体罗系高产油井吐砂严重,延长组油井气体影响容易造成气锁,导致油井事故率偏高,严重影响油田的正常生产,针对以上问题油田引入高效三级防砂液气分离器.高效三级防砂液气分离器主要用于油井防气、防砂.将混合液态变为旋流,利用混合液中气、液、砂密度比将气,液、砂分离,消除砂卡及气体对抽油泵的影响,达到提高泵效及减少重复作业的目的. 相似文献
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1 管式反应器硝铵生产工艺进入系统并带有一定压力的氨经过加热器被蒸汽加热后,与进入系统的硝酸(60%~65%)在管式反应器F内混合并进行强烈放热反应,生成硝铵溶液并产生中和废气。硝铵溶液和废气在分离器V1分离,废气出V1顶部后,由下部进入洗涤塔T1,经喷淋到填料上的循环洗涤液洗涤并回收其中的氨和绝大部分的硝铵雾滴后,上升的废气在洗涤塔上部被蒸汽冷凝液再次洗涤,回收残余的硝铵雾滴,使废气得到净化,出洗涤塔后作为工艺蒸汽,进入界内的蒸汽管网。为了保证洗涤效果,在循环洗涤液中补加适量的硝酸,以便及时调节pH值。吸收了氨、硝铵的循… 相似文献
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0前言低温甲醇洗是目前煤化工项目普遍采用的工艺气体洗涤净化工艺,主要流程可分为原料气甲醇洗涤、富甲醇液闪蒸、硫化氢浓缩、甲醇再生、甲醇水分离、尾气洗涤流程。鲁奇工艺与林德工艺在富甲醇液闪蒸、硫化氢浓缩、甲醇水分离、尾气洗涤流程基本相同,而在原料气洗涤、甲醇再生流程有一定区别:鲁奇工艺采用中压洗涤,而林德工艺没有;林德工艺采用了富硫化氢甲醇过滤器和甲醇水溶液过滤器、原料气气水分离器,而鲁奇工艺没有。 相似文献
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为掌握佛山市顺德新城区降水中污染物的情况,2015年7月至8月,文章作者分别在雨天进行了降水取样,对降水中的pH、电导率、常见阴离子(F-、Cl~-、NO_3~(2-)、SO_4~(2-))及部分重金属(铅和镉)进行监测分析。选择有相关数据的珠江三角洲和石家庄、厦门等地的降水中污染物的情况进行对比。结果表明,顺德新城区降水中的p H和部分阴离子浓度优于珠江三角洲平均值,酸雨类型属于硫酸和硝酸混合型;其水体洁净程度略差于石家庄;铅和镉的浓度也高于厦门,甚至部分超出了人体能直接接触的安全范围。 相似文献
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Saturated very long chain fatty acids (fatty acids with greater than 22 carbon atoms; VLCFA) accumulate in peroxisomal disorders,
but there is little information on their turnover in patients. To determine the suitability of using stable isotope-labeled
VLCFA in patients with these disorders, the metabolism of 22-methyl[23,23,23-2H3]tricosanoic (iso-lignoceric) acid was studied in rats in vivo and in human skin fibroblasts in culture. The deuterated iso-VLCFA was degraded to the corresponding 16- and 18-carbon iso-fatty acids by rats in vivo and by normal human skin fibroblasts in culture, but there was little or no degradation in peroxisome-deficient (Zellweger’s
syndrome) fibroblasts, indicating that its oxidation was peroxisomal. Neither the 14-, 20-, and 22-carbon iso-fatty acids nor the corresponding odd-chain metabolites could be detected. In the rat, the organ containing most of the iso-lignoceric acid, and its breakdown products, was the liver, whereas negligible amounts were detected in the brain, suggesting
that little of the fatty acid crossed the blood-brain barrier. Our data indicate that VLCFA labeled with deuterium at the
ω-position of the carbon chain are suitable derivatives for the in vivo investigation of patients with defects in peroxisomal β-oxidation because they are metabolized by the same pathways as the
corresponding n-VLCFA. Moreover, as iso-VLCFA and their β-oxidation products are readily separated from the corresponding n-fatty acids by normal chromatographic procedures, the turnover of VLCFA can be more precisely measured.
A preliminary report of part of this work (Reference 18) was presented at the 5th International Symposium on the Synthesis
and Applications of Isotopes and Isotopically Labelled Compounds, Strasbourg, France, June 20–24, 1994. 相似文献
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高效液相色谱法分析化妆品中微量成分的研究进展 总被引:1,自引:0,他引:1
综述了高效液相色谱法在化妆品中防腐剂、防晒剂中紫外线吸收剂以及性激素的检测等几个方面的应用;同时,介绍了分析所用的色谱柱、流动相、使用的检测手段以及样品的提取方法;最后针对目前存在的问题,提出了高效液相色谱用于化妆品中微量成分分析的研究方向和发展前景。 相似文献
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H. Toda Y. Mochizuki T. Kawanishi H. Kawashima 《Nutrient Cycling in Agroecosystems》2002,63(2-3):167-173
In a coastal agricultural area in the central part of Japan (Shizuoka), we found decreasing nitrate concentration with depth in a shallow groundwater, where the depth to water table varied between 0.6 and 1.2 m below ground surface. High nitrate concentrations (5–29 mg N L–1) were often observed in the upper layer (0–2 m) of the groundwater, but the concentration decreased to less than 1 mg N L–1 in the deeper layer. Ammonium was scarcely detected, and the concentration of dissolved oxygen was usually low (< 1 mgO2 L–1) in the groundwater. Nitrate in the groundwater often had very heavy nitrogen stable isotope ratios (>20{}). There was a negative relationship between nitrogen stable isotope ratio of nitrate and its concentration. When nitrate was injected into the groundwater with acetylene and bromide (a conservative tracer), nitrate concentration decreased to 20% of the initial level within 5 days, accompanied by the increase in nitrite and nitrous oxide concentration and a little change in bromide concentration. These results indicate that microbial denitrification plays a potential role in the decrease of nitrate in shallow groundwater at the study site. 相似文献
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我国硝酸工业生产技术新进展 总被引:1,自引:0,他引:1
系统叙述了我国硝酸工业2000-2007年生产现状及主要技术成果,尤其指出了国产"四合一"机组的成功投运,使我国硝酸国产化装置取得较大的进步,表现在吨酸的铂耗、氨耗和能耗等方面接近国外引进装置水平,同时介绍了国外双加压法硝酸生产技术的进展.我国已成为硝酸生产大国,仍需以先进的技术改造和发展我国硝酸工业,确保我国硝酸工业健康有序地发展,加快从硝酸生产大国向强国迈进的步伐. 相似文献