共查询到20条相似文献,搜索用时 46 毫秒
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研究了二氧化锰氧化法吸收硫化氢的新工艺,考查了酸度、时间、温度等条件对吸收硫化氢工艺的影响,确定了适合的工艺参数。较合适的条件为:一段,溶液体积0.3L、硫酸浓度0.4mol/L、温度为室温、二氧化锰用量10g;二段,溶液体积0.5L、硫酸浓度0.4mol/L、温度为室温、二氧化锰用量10g。氧化剂二氧化锰被还原为硫酸锰可用氧化水解的方法再生,循环使用。研究结果表明,采用氧化吸收新工艺可以使硫化氢气体的吸收率大于97%,而且二氧化锰可以通过氧化水解的方式再生,实现了氧化剂的再生和循环利用。 相似文献
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采用盐析法回收处理退浆废水中的聚乙烯醇(PVA),结果表明,盐析法可有效回收PVA,其最佳工艺条件为:硫酸钠用量14g/L,硼砂用量1.4g/l,反应时间20min,反应温度50℃,溶液pH值为8.5~9.5。当PVA浓度达到12G/L时,其回收率〉90%。 相似文献
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以EFR-3超低甲醛树脂为整理剂,通过测定整理后棉织物的折皱回复角、断裂强力、撕破强力,对影响防皱效果的各因素进行实验和分析,得出防皱最佳整理工艺为:EFR-3超低甲醛树脂的用量为120 g/L,催化剂MgCl2的用量为18g/L,柔软剂有机硅的用量为30 g/L,渗透剂JFC的用量为1 g/L,pH值为3.4~4.4,85℃预烘4分钟,155℃焙烘5分钟.EFR-3超低甲醛树脂对棉织物的防皱整理工艺具有环保和织物强力损伤小的特点. 相似文献
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接枝法亲水改性腈纶的研究 总被引:2,自引:2,他引:0
采用两步法接枝共聚改性工艺实现腈纶织物亲水改性。通过探索溶胀剂、乳化剂、引发剂的种类和用量,以及活化预处理接枝共聚反应的工艺,确定接枝改性的最佳条件。结果表明:在溶胀剂氯苯7.0g/L, 乳化剂壬基酚聚氧乙烯醚(OP)2.1g/L,引发剂过氧化二苯甲酰(BPO)2.5g/L,亲水性酰胺类单体质量分数 2.0%,活化预处理温度75℃,活化时间30 min,接枝共聚反应温度85℃,反应时间60min,再经浓度为2.0g/ L碳酸钠溶液处理,腈纶织物的吸湿率达到7.0%。 相似文献
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研究了以高炉水淬渣为吸附剂处理含铬(VI)废水的工艺条件。试验结果表明,将废水的pH由0.5调至1,高炉水淬渣粒度为280日(即0.053mm)、用量为0.02g/mL,作用时间为30min,温度为25℃时,铬(VI)的去除率为95.61%,废水中铬(Ⅳ)浓度由7.225mg/L降至0.317mg/L,低于国家污水综合排放标准(GB8978-1996)第一类污染物最高允许排放浓度。 相似文献
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Solid solutions of diphosphates of zinc and copper and of zinc and cobalt were synthesized from mixtures of pure diphosphates at temperatures up to 1000°C. Their X-ray diffractometry patterns varied continuously from one end member to the other. Solid solutions of orthophosphates of composition Zn3−x Cox(PO4 )2, with x = 0.4–1.6, were formed at temperatures up to 950°C; all exhibited the structure of γ-Zn3 (PO4 )2. Solid solutions of orthophosphates of composition Zn3−x Cux (PO4 )2 exhibited more-complex behavior. At 1000°C and copper contents of 20–80 mol%, a phase that is related to Cu3 (PO4 )2, termed here the "ε-phase," predominated. At 850°–950°C and in the region from 20 mol% to ∼33 mol% of copper, the solid solutions (the "η-phase") adopted the structure of graftonite. At 800°–900°C and 10–15 mol% of copper, the solid solutions exhibited a new structure (the "δ-phase"), which we found to be related to the mineral sarcopside. At temperatures 950°C, the solutions that contained 5–15 mol% of copper (the "β-phase") had the structure of β-Zn3 (PO4 )2, whereas at 800°–850°C, solutions with 5 mol% of copper (the "-phase") exhibited the structure of γ-Zn3 (PO4 )2. Attempts to synthesize Cu+ ZnPO4 and Cu+ Cu2+ Zn3 (PO4 )3 were unsuccessful. 相似文献
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为了提高油田的生产效率,设计最佳的油气集输处理的工艺流程,更好地完成油气水分离处理的任务。对油气集输工艺技术进行优化,发挥高效油气水分离处理设备的优势,提高油气水处理的质量,保证油气集输工艺顺利实施,获得最佳的油田产量外输。 相似文献
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建设创新型国家是我们中华民族的历史责任。“自主创新、重点突破、支撑发展、引领未来”的16字方针应当成为我们未来创新活动的指南。建设创新型国家把自主创新放在首位,并提出了引领未来的高标准要求。钢铁科技创新必须突出重点,抓住创新成果产业化这个关键,支撑起行业和国民经济的发展。 相似文献
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相比已经完善丰富的开采和勘探技术,油气的运输以及储存却仍然存在不足之处。我国对能源安全提出更加严格要求的同时,对区域经济的发展规划也有足够重视。因此,保障油气管道的安全则成为了我国能源安全战略的重中之重。在阐释油气管道现阶段在储运安全保障技术发展状况的基础上,分析了现存的问题及解决问题的手段,并指出未来可能使用的目标策略,为今后研究者提供一定程度上的借鉴经验。 相似文献
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膜的污染和劣化及其防治对策 总被引:25,自引:0,他引:25
较为系统地介绍了膜污染和劣化的定义和特点,因膜污染和劣化而造成的膜性能变化,以及如何预防、减少或清除膜污染和劣化的一些通用方法。 相似文献
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James L. White David G. Salladay David O. Quisenberry Donald L. MacLean 《应用聚合物科学杂志》1972,16(11):2811-2827
Gel permeation chromatographic (GPC) and thin-layer chromatographic (TLC) studies of polystyrene, polybutadienes (BR), and their copolymers (SBR) have been carried out. GPC primarily separates them on the basis of molecular size, and TLC, on the basis of composition. Methods of obtaining absolute molecular weight distributions for BR and SBR based upon variations of the Strasbourg Universal Calibration procedure are described. In particular, [η]–M relationships in both the GPC solvent (THF) and in a second solvent (toluene) were used; in addition, results of statistical mechanical calculations for \documentclass{article}\pagestyle{empty}\begin{document}$\overline {s^2 }$\end{document} (based on the assumption of negligible steric hindrance and freely rotating bonds) were applied. An experimental comparison of these methods was carried out, and use of the [η]–M relationships for both solvents was found to give satisfactory results. The predictions of the statistical theory were too low. A detailed study of polymer–solvent–gel interaction in the GPC unit was made through investigation of ternary phase equilibrium in the (polystyrene)–THF–(polymer) system. The polymers studied included BR and SBR with varying styrene contents. Experimental techniques for TLC separations of BR, SBR, and polystyrene according to the composition are described. 相似文献