新型除氧剂异抗坏血酸钠及其复合配方在200MW机组上的应用

本文是在国产200MW机组上所做的新型除氧剂工业试验的技术总结。试验内容包括基础(联氨)试验,低剂量(200ppb)异抗坏血酸钠及其复合配方的试验,并与低剂量(130ppb)二甲基酮肟作了对比。从给水中溶解氧及铁、铜的平均值、合格率和数据波动性以及对pH值等水汽品质指标的影响等多方面综合评价了除氧剂的性能。试验结果表明,HX-02复合配方具有较好的综合性能,是一种具有推广价值的新型除氧剂配方。     

噁唑烷在聚氨酯中的应用

介绍了新型唑烷化合物在聚氨酯弹性体类材料特别是在聚氨酯涂料体系中的应用。唑烷可用于聚氨酯的除水剂、高固含量涂料的活性稀释剂、单组分湿固化涂料及密封胶的潜固化剂、贮存稳定剂,还可用于制备涂料组分,是一类对聚氨酯十分有用的化合物。     

不同品种杭白菊中酚类物质含量和清除自由基活性的比较

4种酮乡产杭白菊及黄菊和野菊,分别用乙醇-水体系进行热回流提取,用比色法测定醇提物中总酚和总黄酮含量,并用化学发光法检测春清除活性氧自由基的能力。结果表明,不同品种间含量存在较大差异,总酚和总黄酮含量（以菊花干基计）最高提异种大白菊,分别为9.76%和4.46%;最低的是黄山种野菊,分别为3.21%和1.99%。不同菊花均显示了良好的清除活性氧自由基的活性,清.OH和O2^.-的IC50分别在0.54-1.98mg/ml和24.2-54.5ug/ml之间,其中清O2^.-活性最强是大洋菊,最弱是软梗小洋菊;而清.OH能力最强为早小洋菊,最终为异种大白菊,结果表明,菊花中酚类物质的含量高低与抗自由基活性强弱无明显的对应关系。     

甲醛捕捉剂YZ-1在脲醛-三聚氰胺甲醛复合树脂衬布硬挺整理剂中的应用

脲醛-三聚氰胺甲醛复合树脂胶作衬布硬挺整理剂使用时,必然带来甲醛的污染。在基本不影响衬布硬挺整理剂使用效果的情况下,用YZ-1作该复合树脂胶的游离甲醛捕捉剂,具有明显的消醛效果。当初始游离甲醛含量小于1．00％时,YZ-1的施加量小于1．0％,可使游离甲醛含量降至0．10％以下;当初始游离甲醛含量在2．00％～6．00％时,YZ-1的施加量为4．0％,可使游离甲醛含量降至0．22％。     

高压锅炉供水除氧防腐蚀剂XC-1

所报道的除氧防腐蚀剂XC－1，可用于压力6．5MPa以上，不能使用亚硫酸钠的蒸汽锅炉除氧，它以亚硫酸铵为主剂，复配以挥发性胺，成膜性胺，乳化剂等助剂，可迅速除氧并调节供水和蒸汽的pH值，防止高温腐蚀，探讨了亚硫酸铵的除氧机理及两种胺的作用，在内考察了不同加量的XC－1对胜利现河3号锅炉注汽转化水的除氧率（煮沸10分钟），加量27mg/L时除氧率98％，加量30mg/L时除氧率100％，在现河3号锅炉上进行了连续96小时的现场试验，XC-1在热力除氧器换热器前加入，除氧温度104℃，每8h加药一次，加药量由25mg/L增加到30mg/L当加量为27mg/L时锅炉供水含氧量在0．1mg/L以下，考虑到除氧温度，压力可能波动，加量确定为28mg/L，这时供水含氧量0．003－0．004mg/L，过剩SO3^2-含量在1．6－3．6mg/L范围，锅炉进口供水pH值平均为8．4,出口湿蒸汽pH值平均为10．03，PH值达到了要求。     

Synthesis and evaluation of some amine compounds having surface active properties as H2S scavenger

In this work three H₂S scavengers were prepared by reacting monoethanolamine with formaldehyde in different ratios (1:1, 2:1 and 2:3) to give MF1, MF2 and MF3, respectively. The chemical structures of the prepared scavengers were confirmed by FT-IR spectroscopy. The effect of reaction time (the time required for completing the reaction between the scavenger and the H₂S gas) has been studied for the three prepared scavengers. The effects of concentration and temperature have been studied on the scavenging efficiency of H₂S using three prepared products and two commercial products EPRI-710 and EPRI-730. The surface and thermodynamic parameters of the prepared scavengers were determined at 25 °C including, surface tension (γ), and effectiveness, maximum surface excess (Γ_max) and minimum surface area (A_min). Also, the standard free energy of micellization and adsorption was recorded. The results show that the efficiency of scavengers increased with increasing reaction time up to 50 min. Also, as concentration of scavengers and temperature increased, the removal efficiency of the scavengers increased. By comparing the efficiency of the prepared products with the commercial products EPRI-710 and EPRI 730, it was found that, MF3 exhibited a similar efficiency comparing with the commercial scavenger EPRI 730 (currently used in the field) at different concentrations and temperatures.     

Antioxidant property of polyhydroxylated naphthoquinone pigments from shells of purple sea urchin Anthocidaris crassispina

Sea urchin gonads are highly priced sushi foodstuff “Uni” in Japanese traditional food, but after removal of them the residual shells with spines are dumped as waste. However, sea urchin shells contain naphthoquinone pigments with several phenolic hydroxyl groups, which were expected to act as potent antioxidant substances by donating hydrogens. Our previous study has evaluated their antioxidant ability to depress lipid peroxidation. This study examined other antioxidant property of the pigments from purple sea urchin shells, which possess larger amount of pigments than those of red and green sea urchins. The pigments as well as known antioxidant, α-tocopherol, exhibited 1,1-diphenyl 2-picryhydrazyl (DPPH) radical scavenging ability. Superoxide anion radical and hydrogen peroxide were also scavenged while hydroxyl radical, one of the most reactive oxygen species, was not significantly inhibited. However, because the pigments had significant activity to scavenge hydrogen peroxide and superoxide anion radical that could be in vivo precursors of hydroxyl radical, sea urchin pigments would be able to depress the generation of its related active oxygen radical species. These results suggested that sea urchin shells, which are still regarded as food waste, would be a new bio-resource for obtaining natural antioxidant.     

解决产品中游离甲醛含量超标问题的方法及研究进展

分析了游离甲醛对人体和环境的危害以及不同产品的游离甲醛限量标准。在概述甲醛性质的基础上,分析了皮革中游离甲醛的来源,并介绍了皮革、胶粘剂、板材、纺织等行业解决游离甲醛方法和甲醛捕获剂的研究进展。     

Activity-guided isolation and identification of radical scavenging components in Gao-Cha tea

Gao-Cha is a traditional Chinese health tea made from Acer ginnala. We performed a components and radical scavenging activity analysis to identify any medicinal components in this tea. High performance thin layer chromatography (HPTLC)-1,1-Diphenyl-2-picryhydrazyl (HPTLC-DPPH) assay showed that the methanolic extract contained strong radical scavengers. Quantitative analysis revealed that the IC(50) of the extract against 1 mM DPPH was 52.7 ± 0.6 μg/mL. Bioactive-guided isolations led to procurement of 3 radical scavengers with IC(50)s of 17.5 ± 2.1, 29.3 ± 2.5, and 21.6 ± 1.7 μg/mL, respectively. Analysis of the high resolution-electric spray ionization-mass spectrometer and (1)H, (13)C, distortionless enhancement by polarization transfer at 135°, heteronuclear quantum coherence, correlating spectroscopy coupling, and heteronuclear multiple bond coherence (HMBC) data revealed that the compounds were methyl 3, 4, 5-trihydroxybenzoate (1), quercetin-3-O-α-rhamnopyranoside (2), and 2,6-bis (3,4,5-trihydroxybenzoyl)-aceritol (3). Bioactive combined components analysis revealed that, apart from compounds 1, 2, and 3, the tea possibly contained radical scavengers: ginnalin A (4) and B (5), 2″-O-Galloylquercitrin (6) and 3″-O-Galloyl-quercitrin (7). Compounds 2, 6, and 7 were isolated from Acer ginnala for the first time. The positions of the 2 galloyl moieties in compound 3 were unambiguously established by the HMBC spectrum for the first time.     

润滑油自由基捕捉剂型抗氧剂作用机理研究

酚型抗氧剂和胺型抗氧剂作为自由基捕捉剂型抗氧剂,已被广泛地应用于各类润滑油中。分析研究了自由基捕捉剂型抗氧剂的作用机理,对于有效地改善润滑油的氧化安定性能、延长润滑油的使用寿命以及研制新型润滑油抗氧剂具有重要意义。