共查询到20条相似文献,搜索用时 140 毫秒
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摘要:介绍了盐水工序所做的改造,改造后的盐水各项离子特别是钙镁离子的含量大大降低,满足了离子膜对精制盐水的要求。 相似文献
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吸氨工序是氨碱法纯碱生产的重要工序之一,近几年我厂对吸氨工序工艺流程作了很大改进:继取消中间冷却之后,又对循环氨盐水系统及热氨盐水系统进行了改造。本文将改造前后的工艺流程作了比较,指出改造后的工艺流程更简单、更合理。实践证明,这些改造为我厂创造了经济效益。 相似文献
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介绍了试验引入上海西恩公司运用于钛白粉行业回收废水中钛白粉的CN过滤装置于一次盐水工序,提高了过滤效果,达到隔膜电解盐水指标要求。该装置投资低、运行简单、效果稳定,大大简化了盐水生产工艺。 相似文献
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1问题的提出1993年,我厂为节能降耗,扩大蒸发生产能力,进行了异地扩建将原三效顺流改为三效顺流部分强制循环工艺。在此工艺中,原来的两台800卧式离心机换为WG—1600离心机。由于异地扩建后,蒸发与盐水工段生产距离增加了近四倍,给蒸发工序向盐水工序输送回收盐水增加了难度。因此,在扩建之初我们便考虑用一台离心机出干盐.然后转送到盐水工序。1994年6月初,我们在试生产过程中,不仅离心机频频振动,而且出液体盐也激烈振动,特别是出干盐的那台离心机,内栏损坏,料斗焊缝胀裂。仅6-7月的试生产中就发生振动200多次,内栏损坏2… 相似文献
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我公司200kt/a甲醇装置系1500kt/a焦炉配套工程,设计原料以焦炉气为主,并配以适量水煤气补碳,以达到氢碳平衡与增产的目的,最大产能可达240kt/a。该装置主要包括水煤气制备、焦炉气及水煤气净化、甲醇合成及精馏工序,另外辅有空分、循环水、除盐水等工序。除盐水工序担负着该装置软水供应及除氧站用水的供给任务,采用2套150t/h浮动床除盐水装置交替投用与再生,保证除盐水的连续稳定供给。 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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Abstract Several hardwood and softwood trees were analyzed for anthraqui-none-type components. Wood samples were reduced to a small size and extracted with an organic solvent; the extracts were then concentrated and analyzed by gas chromatography-mass spectroscopy. Low levels of AQ and anthrone components were detected using a sensitive selected-ion monitoring technique. Ten out of seventeen hardwood samples examined contained AQ-type components; however, the levels were typically below ~6 ppm. Such components were not observed for the few softwood samples that were examined. The AQs were more concentrated in the heart-wood of teak than in the sapwood. Extraction of cottonwood with an organic solvent had little effect on the ease of pulping of the wood. 相似文献
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Hyun Chung Arum Choi In Hee Cho Young‐Suk Kim 《European Journal of Lipid Science and Technology》2011,113(12):1481-1490
Mackerel is known to be a rich source of omega‐3 family PUFAs. The acid value and conjugated dienoic acid value of mackerel, known as indices of oxidation, were determined. Fatty acids in both raw and broiled mackerels were analyzed by GC. PUFAs and saturated fatty acids were observed at a low level in broiled mackerel, possibly as a result of thermal degradation of the lipids. In addition, volatile components in mackerel extracted by solvent‐assisted flavor evaporation were analyzed by GC‐MS. In total, 38 volatile components were detected in raw mackerel, whereas 53 volatiles were found in broiled mackerel. Hydrocarbons and methyl‐ and/or ethyl‐substituted benzenes were quantitatively dominant. Levels of aldehydes and alcohols were significantly enhanced in broiled mackerel, as was the level of benzothiazole, which possibly forms as a result of the condensation of thermal degradation products from amino acids and/or proteins, and lipids. 相似文献
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高效液相色谱法测定化妆品中激素的研究进展 总被引:1,自引:0,他引:1
综述了高效液相色谱法在检测化妆品中糖皮质激素、性激素和环境激素中的应用。详细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;针对目前存在的问题,提出了高效液相色谱用于化妆品中激素分析测定的研究方向和发展前景。 相似文献