201×8阴离子交换树脂吸附铀的性能研究

研究了201×8阴离子交换树脂吸附铀的吸附酸度,吸附速率,吸附温度等性能;确定了吸附和淋洗铀的最佳条件,并对铀与偶氮胂Ⅲ显色反应条件进行选择。用内径34 mm,树脂层高度为400 mm交换柱,负压条件下提取浸出液中铀的吸附效率为98%~100%,淋洗效率为99%以上,效果良好。     

信业商讯

南京信业集团股份有限公司可供美德美美口 芜德氏进贸易一部品名多异氰酸醋 规格 5005 MR一100 MR一200、44V20 PAP127、MS20S、M一100、 M一200、 固体99% DCSO43、DC5365昊清杨超4512448总机转501、541 贸易二部 聚碳级、环氧级 99写 663U、R304 70%、98% 多99.7% 940A一111 各种牌号 99%任强慧黄自明朱振伟产地英、日、美乙二醇乙醚99%乙二醇丁醚99%乙二醇乙醚酷酸酉旨99%又寸氯甲苯99%酷酸丁酉旨异99.5%联系人:顾怡年李玉梅韦方吕三乙烯二胺高回弹硅油联系人:胡永年电话:4525941、美、日 美电话:4526314 4522048;总机转 贸易六…     

三元复合驱体系驱油剂的开发

用D相乳化法,由十二烷基苯磺酸钠与醇醚硫酸盐、多元醇、二甲苯等复配生产了新型微乳液驱油剂S99;并以之配制了三元复合驱体系。该体系的质量百分组成为:0.06%S99+1.5%氢氧化钠+0.15%聚合物+0.2%助剂。此复合驱体系可使油水张力降低到1.1×10-2mN/m,并进行了原油驱替实验,结果表明,可提高采油率13.82%,提高剩余油采收率27.8%。     

Pb、Bi改性Pd催化剂合成芳樟醇

反应温度30～75℃,压力0.5～1.0MPa,以Pb、Bi改性的Pd催化剂合成芳樟醇,当催化剂中w(Pd)=1%时,脱氢芳樟醇转化率为99%～100%,合成芳樟醇选择性大于98%。产品经减压精馏,w(芳樟醇)>98%,收率为80%～90%。以Lindlar催化剂合成芳樟醇,脱氢芳樟醇转化率为99%～100%,合成芳樟醇选择性为95%～97%。     

高炉用优质Si_3N_4结合SiC砖的生产

将SiC砂及Si粉合理搭配 ,通入纯度为99 .99%、H2 O含量小于 50× 1 0 - 6的氮气氮化烧成 ,通过一系列成熟而严格的工艺控制 ,其氮化率可达 89% ,产品的体积密度为 2 .69g·cm- 3,耐压强度达到 2 0 4MPa ,高温抗折强度达到 61 .8MPa。     

低分子量壳聚糖的制备

利用H2O2的强氧化性制备低分子量分布的壳聚糖是将虾皮用HC l浸泡去除碳酸钙盐;再用稀碱除去蛋白质得甲壳素;然后浓碱在50℃与其反应,并控制反应时间,分别制备出脱乙酰度为85%,93%,99%的壳聚糖,最后用H2O2氧化不同脱乙酰化壳聚糖,得到不同低分子量的壳聚糖。其中,脱乙酰度为85%壳聚糖用不同浓度的H2O2降解,得到了4.7×105,3.5×105,2.5×105,1.2×105,8×105等5个不同分子量段的壳聚糖产品。H2O2浓度越大,降解所得壳聚糖的分子量就越小。     

问号钩端螺旋体鞭毛相关基因flhA、flhB_2和fliR的克隆及原核表达系统的构建

目的克隆问号钩端螺旋体鞭毛相关基因flhA、flhB2和fliR,并构建其原核表达载体。方法按常规苯酚-氯仿法提取问号钩端螺旋体黄疸出血群赖型56601株基因组DNA,高保真PCR扩增flhA、flhB2和fliR基因片段,T-A克隆后测序,构建原核表达载体,采用SDS-PAGE和免疫印迹法检测目的融合蛋白的表达。结果问号钩体56601株flhA、flhB2和fliR基因扩增片段的核苷酸序列与报道的相应序列同源性分别为100%、99·9%和99·9%,氨基酸序列同源性分别为100%、99·8%和100%。所构建的重组原核表达系统在IPTG的诱导下,能有效地表达目的融合蛋白Trx-FlhA、Trx-FlhB2和Trx-FliR,产量约为细菌总蛋白的10%。结论已成功构建了问号钩端螺旋体鞭毛相关基因flhA、flhB2和fliR原核表达系统。     

高效液相色谱法测定稻·恶乳油中稻瘟净和恶霉灵的含量

本文采用高效液相色谱法 ,对稻瘟净和恶霉灵的复配制剂进行分析 ,色谱柱 2 5 0mm× 4 6mm不锈钢柱 ,内装BDSC18填充物 ,检测波长 2 2 0nm ,流动相 :乙腈 +水 =6 0 +4 0 (v/v) ;回收率 :稻瘟净 99 5 %～ 10 0 5 % ,恶霉灵 99 3%～ 10 0 6 % ,变异系数分别为 :0 41%和 0 6 9% ,为稻 恶乳油产品的质量控制建立了准确、快速的分析方法     

易红窑部位的保护方法

我厂Φ3.4m×65m1号水泥窑是普通干法余热发电窑,3档支撑,斜度5%,带有12个Φ1.2m×5m冷却筒。生产能力17t/h,年运转率为80%～90%,窑转速一般在38～44r/h之间。1原挡砖砌筑情况该窑冷却带标准砖为P6特磷或硅莫砖,规格尺寸是(长×宽×小头/大头):200×180×74/83。由于窑体长、斜度大,物料的燃烧时间不易控制,故在窑后部预烧处和窑头出口处各设有一道挡料圈。挡料圈砌筑用6排挡料圈砖,挡料圈砖为P3225特磷或硅莫砖,规格尺寸是200×250×84/100。挡料圈砖下面垫有2种保温砖,规格尺寸分别是,小砖为200×75×105/110,大砖为200×150×100/110。…     

国家日用陶瓷质量监督检验中心建筑陶瓷产品检验结果

20 0 1年 2季度本中心对下列企业的产品进行了委托抽样检验 ,经检验产品符合相应标准要求 ,特此公布。(排名不分先后 ) 2 0 0 1年 7月 8日企业名称产品名称商标规格执行标准南海市金舵陶瓷有限公司抛光砖金舵 60 0× 60 0ｍｍＧＢ/Ｔ4 1 0 0 .1 -99南海市金舵陶瓷有限公司抛光砖金舵 60 0× 4 0 0ｍｍＧＢ/Ｔ4 1 0 0 .1 -99广东南海华信达陶瓷有限公司高级抛光砖华信达 80 0× 80 0ｍｍＧＢ/Ｔ4 1 0 0 .1 -99广东南海华信达陶瓷有限公司耐磨砖华信达 4 96× 4 96ｍｍＧＢ/Ｔ4 1 0 0 .2 -99广东南海华信达陶瓷有限公司耐磨砖华信达 60 0× 60…     

气相色谱法测定甲型肝炎灭活疫苗中三氯甲烷残留量

目的应用顶空气相色谱法测定甲型肝炎灭活疫苗中三氯甲烷残留量。方法采用毛细管色谱柱DB-WAX(30m×0.53mm×0.50μm),ECD检测器,以氮气为载气,顶空进样。以不同基质稀释的三氯甲烷工作液绘制标准曲线,并对方法进行适用性及专属性、线性关系、精密度、定量限、检出限和准确性验证。结果通过绘制的2条标准曲线可见,存在基质效应的影响。甲肝疫苗中三氯甲烷与其他杂质峰的分离度为2.58;三氯甲烷在20～100ng/ml的浓度范围内线性关系良好(R2=0.9993);精密性良好,检测结果的RSD均小于5%;最低检出限为1.2ng/ml,最低定量限为4.8ng/ml;检测高、中、低3种浓度样品的加标回收率分别为(95.6±1.8)%、(95.5±3.1)%和(101.9±2.1)%。结论顶空气相色谱法简便灵敏,结果准确可靠,适用于甲型肝炎灭活疫苗中三氯甲烷残留量的测定。     

深宽比对微通道内气液二相流空隙率的影响

微通道内气液二相流的空隙率对管路内热质传递具有重要影响。利用高速摄像仪对4种不同深宽比的矩形截面微通道内空气-水二相流的流型进行实时观测和记录,对二相流型图进行了分析和计算,得到了不同流型时的空隙率。4种微通道尺寸(深度×宽度)分别为100μm×200μm,100μm×400μm,100μm×800μm,100μm×2 000μm。结果表明:对于弹状流,空隙率随着微通道截面深宽比的减小而降低,当流型为液环流时,空隙率随着微通道截面深宽比的减小而增加。在实验基础上,将截面深宽比作为参数提出了一个新的空隙率预测模型,计算结果显示:模型能对矩形截面微通道内气液二相流动空隙率进行很好的预测。     

Separation of mercury and arsenic from produced water via hollow fiber contactor: Kinetic and mass transfer analysis

The separation of Hg(II) and As(V) from produced water by hollow fiber contactors was investigated. Two identical hollow fiber modules were employed. The first module was used for extraction, while the second module was used for stripping. The optimum conditions achieved were 14% (v/v) of Aliquat336, 0.07 M thiourea, volumetric flow rate of 100 mL/min for aqueous solution and 0.02 M HCl of stripping solution. At such conditions, the maximum extraction of Hg(II) and As(V) attained 100% and 78.78%, respectively. Concurrently, the maximum stripping of Hg(II) and As(V) reached 47.88% and 6.66%, respectively. The overall mass transfer coefficients of Hg(II) and As(V) extraction were 2.31×10^?6 and 1.15×10^?6m/s, while the Hg(II) and As(V) stripping exhibited the overall mass transfer coefficients of 8.37×10^?7 m/s and 9.05×10^?7 m/s, respectively. Mass transfer coefficients of the organic layer diffusion (k₀) had the most effect on the overall mass transfer coefficients.     

Two-Stage Optimization of Coliforms,Helminth Eggs,and Organic Matter Removals from Municipal Wastewater by Ozonation Based on the Response Surface Method

In this study, a set of municipal wastewater (MWW) samples from an actual residual water treatment plant was treated by ozone. The residual water was characterized in terms of organic load and biological contaminants: total coliforms (TC), fecal coliforms (FC) and helminth eggs (HE). Initial values of these parameters were 2.8 × 10⁷ MPN/100 mL, 8.48 × 10⁶ MPN/100 mL, and 470 L^?1, respectively. The experimental setup considered the modification of pH and ozone dose as independent variables. Three different initial pH values (4.0, 7.0, and 11.0) and three different ozone concentrations (6, 15, and 30 mg/L) were used to investigate the pH ozone dose effect. The efficiency of ozone-based treatment was determined by the reduction of the microbiological indicators (TC, FC, and HE) and physicochemical parameters (COD and turbidity). The response surface method was used to determine suboptimal reaction conditions. These conditions were obtained using a two-stage procedure. The conditions under which both microbiological and organics were better removed corresponded to pH 7.8 and ozone concentration of 15.5 mg/L. A decline of biological indicators of 99% for TC, 99% for FC, and 99% for HE was obtained under the same reaction conditions. The reduction of chemical oxygen demand (COD) and turbidity was 75% and 85% under the same operation conditions, respectively.     

2-羟基-3-辛基-5-长链烷基苯磺酸钠的合成及表面活性

以脂肪酸、苯酚为原料,经酰化反应、酯化反应、Fries重排、氢化还原反应、磺化以及中和反应等步骤,合成出了2-羟基-3-辛基-5-长链烷基苯磺酸钠表面活性剂。两相滴定法测定了产物的质量分数均大于99%;用核磁共振氢谱、傅立叶红外光谱和质谱对产物进行了结构鉴定。用悬挂滴法测定了30℃时该系列表面活性剂的表面张力。实验发现,纯水溶液中表面活性剂的临界胶束浓度(CMC)达到10-6mol/L数量级,临界胶束浓度下的表面张力(γCMC)均小于28 mN/m;随着苯环上长链烷基碳数(n=8,10,12)的增加,CMC降低,分别为1.06×10-5,3.35×10-6,2.65×10-6mol/L;而γCMC变化不明显,分别为26.77,26.89,27.22 mN/m。结果表明,此类表面活性剂具有比较好的表面活性。     

气相色谱法测定羟丙基-β-环糊精平均取代度

以甲苯为内标物,碘丙烷为对照品,建立了一种利用气相色谱法测定羟丙基-β-环糊精平均取代度的新方法。色谱柱为HP-5固定相(30 m×0.251 mm,膜厚0.25μm),检测器为氢火焰离子化检测器(FID),柱温100℃,进样器温度200℃,检测器温度250℃,载气N2,流速1.0 mL/min,分流比1∶80,方法重复性好,RSD=0.9%,精密度高,RSD=2.8%,测定结果与核磁共振法结果基本一致。     

Effect of mixed size particles reinforcing on the thermal and dynamic mechanical properties of Al2O3/PPS composites

Thermal and dynamic mechanical properties of polyphenylene sulfide (PPS) composites that were reinforced with different sized alumina (Al₂O₃) particles were studied. These composites were manufactured with two different sizes of Al₂O₃ particles 1 and 63 µm, using microcompounding and injection molding. Monosized Al₂O₃ particles reinforced up to 25 wt% loading content and mixed size Al₂O₃ particles reinforced at 15 wt% loading content as following particle weight proportions: 75% × 63 μm + 25% × 1 μm, 50% × 63 μm + 50% × 1 μm, 25% × 63 μm + 75% × 1 μm. Particle distribution investigations were performed by microcomputerized tomography (micro‐CT). Thermal properties were analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) methods and also dynamic mechanical properties were investigated by dynamic mechanical thermal analysis (DMTA) method. The results showed that mixed size Al₂O₃ particle reinforced composites showed a great enhancement in dynamic mechanical properties without significant change in thermal properties. It was concluded that mixed size particles showed a great synergy to give better results compared with monosized particle reinforced composites. POLYM. COMPOS., 37:3219–3227, 2016. © 2015 Society of Plastics Engineers     

Fast Transmethylation of Serum Lipids Using Microwave Irradiation

Microwave irradiation as the energy source for one-step direct transesterification of fatty acids in human serum lipids was examined in a solvent system of methanol: hexane: acetyl chloride based on a Lepage & Roy assay. Innovative and explosion proof single-mode or multimode microwave accelerated reaction system was employed. Recoveries were calculated as the percentage of fatty acid concentrations measured by microwave assay to those by the reference method of the Lepage & Roy assay that utilized conductive heating at 100?°C for 60?min. Under conditions of 100?°C for 1?min in Single-mode (S4–100?×?1), or 125?°C for 5?min in Multimode (M5–125?×?5), the recoveries were 100–103?% for the total fatty acids and 96–106?% for each categorized fatty acid, including saturates, monounsaturates, n-6 PUFA, and n-3 PUFA. For individual PUFA, the mean recoveries were 102–105?% for 18:2n-6 and 18:3n-3; 99, 109, and 95?% for 20:4n-6, 20:5n-3, and 22:6n-3, respectively. Thus, fatty acid concentrations determined by microwave fatty acid assay were accurate to those results by the reference method, when the microwave conditions were optimal. In summary, the microwave irradiation could replace conductive heating in one-step direct transesterification, and reduce the duration from 60?min to 5?min or less. This methodology may be applied in both the absolute and relative quantification of serum total fatty acids.     

重组人干扰素β1b活性测定国家标准品的研制

目的研制重组人干扰素β1b(rhIFNβ1b)生物学活性测定国家标准品。方法按《中国药典》三部(2005版)要求检测rhIFNβ1b标准品原液各项质量指标,以rhIFNβ1b国际标准品为标准进行协作标定,并检测其稳定性。结果rhIFNβ1b国家标准品经检测,外观、无菌试验合格,水分含量为0.8%,分装精度为0.44%。该标准品经3家实验室协作标定24次,几何平均生物学活性为7.18×104IU/支,平均生物学活性的95%可信区间为6.87×104～7.52×104IU/支,单次测定的95%参考值范围为5.76×104～8.68×104IU/支,平均可信限率为4.36%。在温度为-20、4、25和37℃条件下放置12个月,其生物学活性保持稳定。结论该批rhIFNβ1b活性测定国家标准品各项指标均符合要求,可作为国家标准品使用,生物学活性定为7.2×104IU/支,批号为08/01。