Hydrogen Peroxide as a Resin Cure Accelerator

The reaction of hydrogen peroxide with conventional resin adhesives was sufficiently exothermic for the heat to accelerate and improve resin cure in the hotpress. As a consequence, pressing times for medium density fibreboard, particleboard, and plywood could be reduced by up to 30% and, in some cases, better resin cure permitted a reduction in binder level. Differences in the interaction of hydrogen peroxide with various adhesives were observed and a catalyst was found to enhance the exothermic effect.

The behaviour of hydrogen peroxide in combination with a tannin-based binder and wood fibre was studied over a wide temperature range. Below 60°C the system was stable. At 70°C the initial reaction was endothermic followed by a slow exothermic reaction. At hotpressing temperatures the exothermic reaction was rapid but controllable. It was concluded that the hydrogen peroxide-tannin-fibre system does not impose an additional safety hazard on medium density fibreboard plant operation.     

双氧水装置工作液泵的改造设计

介绍了双氧水生产装置由3．5kt／a提产到6kt／a的扩产改造,通过对工作液密度、流动类型、阻力等的计算,算出泵的扬程,再根据泵的扬程和流体的特性来选择合适的泵,以达到扩产改造的需求。经实践证明,此方法选出的泵满足生产需要,带来了显著的经济效益。     

Treatment of Industrial Landfill Leachates By Chemical And Biological Methods: Ozonation,Ozonation + Hydrogen Peroxide,Hydrogen Peroxide And Biological Post-Treatment For Ozonated Water

The objective of this study was to determine a suitable treatment method for variable waters from a forest industry landfill site. The main target was to find out the impact of different chemical treatments on the composition and biodegradability of those waters. Earlier studies have shown that biological treatment alone is not a suitable treatment method for these waters. That is why ozonation, ozonation+hydrogen peroxide and hydrogen peroxide treatment were studied in a laboratory scale. The ozonated waters were also biologically post-treated.

All the methods studied were able to degrade a part of the organic compounds and convert them into a more biodegradable form. Also the BOD/COD -ratio increased significantly. The removal of organic compounds by ozonation was 30 - 50 %. Hydrogen peroxide addition did not improve the degradation. The combination of pre-ozonation and biological post-treatment gave a total TOC removal between 50 - 95 %.     

双氧水系统工作液中水分的快速测定

采用卡尔费休法测定双氧水系统工作液中水分,克服了原方法中用时较长的缺点,快速、简便、准确,取得了满意的效果。     

Effects of Hydrogen Peroxide Residuals on Biologically Active Filters

The objective of this research was to obtain a better understanding of the effects of hydrogen peroxide (H₂O₂) residuals on the biological removal of certain biodegradable components in biologically active filters. Data were collected at lab scale using two parallel anthracite/sand filters. Both filter influents (dechlorinated tap water) were dosed with a biodegradable organic matter (BOM) cocktail, and one filter received additionally H₂O₂ at an influent concentration of approximately 1 mg/L. Measured parameters included carboxylic acids and hydrogen peroxide residuals. The results showed that the presence of H₂O₂ residuals (～ 1 mg/L) did not lead to a major inhibition of the biological removal of acetate and formate anions. After a period of biological acclimatization (colonization), H₂O₂ was removed rapidly within the biological filter, probably as a result of its reaction with the biomass or with catalase produced by certain bacteria.     

绿色过氧化氢双组元自燃推进剂

过氧化氢/煤油或过氧化氢/醇类(如乙醇、异丙醇和正丁醇等)组合,由于环境友好和可贮存性而成为最具竞争力的双组元推进剂,但这种推进剂组合本身并不能自燃点火。通过向煤油或醇类燃料中加入可溶性添加剂的均相催化法解决了该推进剂组合的自燃点火关键技术,用滴流点火试验和自燃点火延迟期测定仪确定了一些推进剂组合的自燃点火性能,并通过发动机热试车对某些推进剂组合的自燃性能和稳态燃烧特性进行了评估。     

过氧化氢催化氧化载体的研究进展

本文介绍有关过氧化氢的催化氧化反应,并重点介绍了其反应过程中的各种催化剂载体的研究进展,比如硅胶、分子筛、活性炭等载体。     

过氧化氢脲合成方法的研究

研究了用双氧水和尿素制备一种固体消毒剂过氧化氢脲的方法,探索最佳反应条件和物料比,得到了较高产率和含量时的反应温度、时间和物料比,对产品含量进行了测定,均符合美国药典(ⅩⅩⅡ)的标准.     

Phenyl Selenide-Based Precursors as Hydrogen Peroxide Inducible DNA Interstrand Cross-Linkers

DNA interstrand crosslinks (ICLs) are highly toxic DNA lesions, and induce cell death by blocking DNA strand separation. Most ICL agents aiming to kill cancer cells, also generate adverse side effects to normal cells. H₂O₂-inducible DNA ICL agents are highly selective for targeting cancer cells, as the concentration of H₂O₂ is higher in cancer cells than normal cells. Previous studies have focused on arylboronate-based precursors, reacting with H₂O₂ to generate reactive quinone methides (QMs) crosslinking DNA. Here we explore phenyl selenide-based precursors 1 – 3 as H₂O₂-inducible DNA ICL agents. The precursors 1 – 3 can be activated by H₂O₂ to generate the good benzylic leaving group and promote production of reactive QMs to crosslink DNA. Moreover, the DNA cross-linking ability is enhanced by the introduction of substituents in the para-position of the phenolic hydroxyl group. From the substituents explored (H, OMe, F), the introduction of electron donating group (OMe) shows a pronounced elevating effect. Further mechanistic studies at the molecular and DNA levels confirm alkylation sites located mainly at dAs, dCs and dGs in DNA. Additionally, cellular experiments reveal that agents 1 – 3 exhibit higher cytotoxicity toward H1299 human lung cancer cells compared to clinically used drugs, by inducing cellular DNA damage, apoptosis and G0/G1 cell cycle arrest. This study provides a strategy to develop H₂O₂-inducible DNA interstrand cross-linkers.     

Pyrazinium Salts as Efficient Organocatalysts of Mild Oxidations with Hydrogen Peroxide

A series of 3‐substituted pyrazinium tetrafluoroborates was prepared as simple analogues of flavinium salts which are efficient organocatalysts for oxidations with hydrogen peroxide. It was shown that pyrazinium derivatives with an electron‐withdrawing substituent catalyze mild oxidations of sulfides to sulfoxides and Baeyer–Villiger oxidations in a similar way to flavinium catalysts. The most reactive catalyst, 3‐cyanopyrazinium tetrafluoroborate, was efficiently employed in preparative sulfoxidations of aromatic and aliphatic sulfides as well as in Baeyer–Villiger oxidations of cyclobutanones. A proposed mechanism for the catalysis is based on the formation of pyrazine hydroperoxide which is the agent oxidizing the substrate.     

H2O2为氧源烯烃催化环氧化反应的研究

H2O2是一种绿色环保的氧化剂,廉价经济而且副产物只有水.文章以H2O2为氧化剂从金属催化方面详细研究了催化环氧化体系的进展及研究现状.     

Impact of Ozone and Hydrogen Peroxide vs. UV and Hydrogen Peroxide on Chlorine Residual

The current study undertaken by the Walkerton Clean Water Centre (WCWC) is to evaluate the application of Advanced Oxidation Processes (AOPs) involving Ozone and UV with the addition of hydrogen peroxide, as one of the methods used in the process of the removal of PPCPs and EDCs, or taste and odor. The amount of hydrogen peroxide used with UV is much higher than that used with the ozone application. The concern is the impact of the hydrogen peroxide on the chlorine residual in the water that is pumped to the distribution system. One of the methods used to deal with this problem is to increase the chlorine addition to maintain the required residual. That could increase the disinfectant by-products (DBPs), namely Trihalomethanes (THMs), in addition to increase to the cost of operation. The findings of these experiments would provide useful information regarding the AOPs application using ozone vs. UV with hydrogen peroxide.     

过氧化氢生产用三相固定床中泡沫流持液量的实验研究

研究采用空气-蒽醌工作液体系模拟过氧化氢生产中蒽醌氢化用三相反应器内流体的流动情况。首先建立了实验测定部分发泡固定床内泡沫流持液量的方法。然后应用建立的方法测定了不同气液表观流速下动态持液量,并考察了气液表观流速对动态和总持液量的影响。最后,比较了10种用于估算发泡体系泡沫流区持液量经验式的计算精度。结果表明,分别采用Specchia和Larachi经验式估算动态和总持液量的计算误差均在5％以内。     

四丁基溴化铵催化过氧化氢氧化香紫苏醇合成香紫苏内酯的研究

在有机溶剂中,以质量分数30%过氧化氢作氧源,四丁基溴化铵为相转移催化剂,钨酸钠、硫酸氢钠为酸性催化剂,催化氧化香紫苏醇合成香紫苏内酯,考察了硫酸氢钠、钨酸钠、四丁基溴化铵用量和反应时间对反应的影响。当n（香紫苏醇）：n（双氧水）：n（四丁基溴化铵）：n（钨酸钠）：n（硫酸氢钠）=100：300：2：1：1,在回流温度下,反应6h,产率可达72%。     

过氧化氢氧化法合成四氯苯醌的研究

以对苯二酚,过氧化氢,盐酸为原料,以盐酸与醋酸(比例为2∶3)为溶剂,间歇滴加过氧化氢,阶梯程序升温反应,反应分别在45℃、70℃、95℃三阶段进行,原位生成氯气氯化合成四氯苯醌。合成四氯苯醌的收率和纯度都可达97%     

过氧化氢及其精馏浓缩

根据过氧化氢精馏浓缩的特点,介绍一种节能和安全型的精馏流程及高新填料精馏塔。     

气体扰动萃取过氧化氢的试验研究

在内径为50mm的筛板塔内,研究了蒽醌工作液-过氧化氢-水体系的气体扰动萃取过程。萃取温度为40℃,空气和分散相的表观流速分别为（0～3．22）mm／s和（1．27～1．70）mm／s,分散相和连续相的表观流速之比为50：1。结果表明,在过氧化氢萃取塔中引入扰动气体,增大了分散相滞液率,提高了总板效率,降低了萃余相中过氧化氢的含量。     

过氧化氢做为氧化剂的Baeyer-Villiger氧化反应在合成中的应用

综述了醛、酮在过氧化氢做为氧化剂的条件下的Baeyer-Villiger氧化。介绍了环境友好型氧化剂过氧化氢在不同催化剂的催化下对醛、酮的Baeyer-Villiger氧化。     

刺激响应型过氧化氢凝胶的制备与性能

通过低温震荡方法制备了过氧化氢凝胶。研究了微米和纳米级颗粒状二氧化硅对过氧化氢的胶凝行为及其所形成凝胶的刺激响应性。用R／S软物质测定仪研究了某过氧化氢凝胶配方的触变性能。结果表明,二氧化硅的粒度与表面性质直接影响其胶凝能力,亲水性纳米二氧化硅比亲水性微米二氧化硅具有更好的胶凝能力,而疏水性微米和纳米二氧化硅不能胶凝过氧化氢。亲水性纳米二氧化硅的过氧化氢凝胶具有显著的温度／剪切双重刺激响应性,并随过氧化氢浓度的增加而增强。在实验的基础上,提出了凝胶形成和刺激触变的可能机理。实验发现,加入微量表面活性剂与氢氟酸,能够有效提高凝胶的稳定性。