共查询到20条相似文献,搜索用时 62 毫秒
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河北新启元能源技术开发股份有限公司(简称新启元公司)加氢装置为回收利用氢气循环过程中排放的氢气,开展了排放氢的回收与利用研究。通过采用脱硫和除油系统,对排放氢气进行净化,净化后的氢气送至制氢装置变压吸附提纯(PSA)单元进行吸附提纯,然后继续供给加氢装置使用。通过对氢气回收利用,将作为燃料的排放氢气转化为蒽油装置辅助原料的高纯度氢气,实现了原料的高效利用,降低了成本,提高了经济效益。 相似文献
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加拿大技术公司TechnologyConvergenceInc.已经开发出一条生产甲醇的绿色的工艺。今天,大部分甲醇的生产工艺是:通过将甲烷和水转换成氢气、一氧化碳和二氧化碳;然后氢气与一氧化碳化合生产甲醇。相比较,TCI将水电解成氢气和氧气。在部分氧化中,氧气与甲烷反应可形成一氧化碳,然后一氧化碳与氢气像传统工艺那样进行化合。据TCI总裁MichaelGreen称,与传统工艺相比,二氧化碳释放可降低达80%;过量氢气可出售。甲醇和氢气在原料电池方面均具有吸引力,Green认为该工艺可以取代大型的海外甲醇工厂。加拿大开发出一条生产甲醇的… 相似文献
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氢气因能量密度高和燃烧产物无污染得到了广泛的关注,如何以清洁高效的方式制备氢能成为研究中的重点。光伏-电解、光催化、光电催化分解水可以利用储量丰富的太阳能和水产生氢气,是很有前景的氢气制备技术。其中,电化学反应是水分解工艺的关键环节,直接决定整个系统能量转换效率的高低。而以往研究多集中于催化材料的开发,往往忽略了电解液的性质对电解性能的影响。因此本文综述了电解质对电催化分解水的影响和意义,根据水分解的基本理论和反应机理,讨论了电化学步骤中电解质pH、离子成分对表面催化过程和物质传输的影响。通过调控电解质来影响固液界面反应,达到在各种水分解系统中提高能量转化效率和稳定性的目的,这有助于开发高效的电催化体系,并为大规模应用提供参考。 相似文献
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过氧化氢法制备高纯度二氧化氯的研究 总被引:2,自引:0,他引:2
在酸性条件下,以过氧化氢还原氯酸钠制备高纯度二氧化氯进行了实验研究.实验数据表明,反应的温度和酸度对反应结果影响比较大,预先加入氯离子可以起到强化作用.实验得出了最佳的反应条件:真空度为0.010 MPa,温度为80℃,硫酸浓度为4 mol/L,过氧化氢与氯酸钠的质量比为0.190.在此条件下,能够保证二氧化氯纯度为100%,且氯酸钠转化率大于88%,二氧化氯收率在90%以上.解决了目前制备方法中二氧化氯纯度与氯酸钠转化率、二氧化氯收率不能同时兼得的问题. 相似文献
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Yanhui Yi Li Wang Juan Yu Hongchen Guo Jialiang Zhang Changgong Meng 《American Institute of Chemical Engineers》2018,64(3):981-992
Direct synthesis of hydrogen peroxide (H2O2) from H2 and O2 is an ideal route. H2/O2 plasma has a great potential for direct synthesis of high purity H2O2 without purification operations. However, low yield and high energy consumption limits the application of H2/O2 plasma in industry. This article reports that gas state Ar and H2O molecule serving as molecular catalysts promoted the synthesis of H2O2 from H2/O2/Ar/H2O plasma dramatically: the H2O2 yield was enhanced by 244% and the energy consumption was reduced by 70.9%. Ar not only increased the electron density, but also selectively accelerated the dissociation of H2 toward the formation of ?HO2, a key intermediate species in H2O2 synthesis. While H2O facilitated the formation of ?HO2 radical and stabilized it by forming a HO2?H2O complex, resulting in enhancing the H2O2 production. This single molecular catalysis reduced the cost of H2O2 synthesis more than 50%. © 2017 American Institute of Chemical Engineers AIChE J, 64: 981–992, 2018 相似文献
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In this review the state-of-the-art of catalytic processes known today for selective epoxidations using aqueous H2O2 as the oxidant is presented. Recent achievements from our laboratories on the development of catalysts for epoxidations with H2O2 are given as well. For all systems their viability for application in green catalytic processes is evaluated, based on selectivity of the reaction, turnover frequency, substrate scope and solvent needed. 相似文献
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Xiaowei Zhang Yanyan Zhang Chenxiao Xu Kun Liu Huangai Bi Xizhen Ai 《International journal of molecular sciences》2021,22(23)
Hydrogen sulfide (H2S) plays a crucial role in regulating chilling tolerance. However, the role of hydrogen peroxide (H2O2) and auxin in H2S-induced signal transduction in the chilling stress response of plants was unclear. In this study, 1.0 mM exogenous H2O2 and 75 μM indole-3-acetic acid (IAA) significantly improved the chilling tolerance of cucumber seedlings, as demonstrated by the mild plant chilling injury symptoms, lower chilling injury index (CI), electrolyte leakage (EL), and malondialdehyde content (MDA) as well as higher levels of photosynthesis and cold-responsive genes under chilling stress. IAA-induced chilling tolerance was weakened by N, N′-dimethylthiourea (DMTU, a scavenger of H2O2), but the polar transport inhibitor of IAA (1-naphthylphthalamic acid, NPA) did not affect H2O2-induced mitigation of chilling stress. IAA significantly enhanced endogenous H2O2 synthesis, but H2O2 had minimal effects on endogenous IAA content in cucumber seedlings. In addition, the H2O2 scavenger DMTU, inhibitor of H2O2 synthesis (diphenyleneiodonium chloride, DPI), and IAA polar transport inhibitor NPA reduced H2S-induced chilling tolerance. Sodium hydrosulfide (NaHS) increased H2O2 and IAA levels, flavin monooxygenase (FMO) activity, and respiratory burst oxidase homolog (RBOH1) and FMO-like protein (YUCCA2) mRNA levels in cucumber seedlings. DMTU, DPI, and NPA diminished NaHS-induced H2O2 production, but DMTU and DPI did not affect IAA levels induced by NaHS during chilling stress. Taken together, the present data indicate that H2O2 as a downstream signal of IAA mediates H2S-induced chilling tolerance in cucumber seedlings. 相似文献
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国外过氧化氢制备研究开发进展 总被引:2,自引:2,他引:0
胡长诚 《化学推进剂与高分子材料》2005,3(1):1-9
综述国外过氧化氢制备研究开发进展,包括蒽醌法工艺改进、氢氧直接化合法研究开发历程和过氧化氢产品净化提纯技术进展。特别突出介绍了几家公司在氢氧直接化合法研究开发方面取得的较有工业化前景的工艺成果。还介绍了国外一些学者在蒽醌法氢化产物及氢化催化剂等方面所进行的研究工作,在其论文中提出了一些新发现。全文重点介绍专利技术。 相似文献
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双氧水超临界氧化对氨基苯酚模拟废水 总被引:1,自引:0,他引:1
在连续流管式反应器中,以H2O2为氧化剂,在温度480~550℃、压力32~38 MPa及H2O2过量100%~270%的条件下,用超临界水氧化(Supercritical water oxidation,简称SCWO)对含对氨基苯酚的模拟废水进行了实验研究.结果表明,采用SCWO法能有效去除废水中的含氮有机物对氨基苯酚. 升高温度、升高压力和延长停留时间使COD去除率显著提高. 在550℃, 38 MPa, H2O2过量190%和停留时间229 s时,COD去除率高达98.5%. 在此条件下,SCWO总动力学对COD是2.13级,反应的活化能为29.3 kJ/mol. 相似文献
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张兴华 《化学推进剂与高分子材料》2006,4(2):63-65
对中原大化5kt/a 50%过氧化氢装置生产中存在的问题进行分析和研究,提出改造方案和改进设想,为同类厂家和科研单位提供参考和借鉴。 相似文献
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主要介绍双氧水生产中产生的尾气、污水和废氧化铝等污染物的来源、污染物性质、污染物组成、危害及其在生产过程中是如何产生的;我国目前双氧水生产中对环境保护的现状;介绍国内一些双氧水厂家比较成熟和先进的污染物处理回收方法及所采用的环保设施。 相似文献