胶束电动毛细管电色谱分离测定水中邻苯二甲酸酯

运用胶束电动毛细管色谱法同时分离测定了水中邻苯二甲酸二甲酯、邻苯二甲酸二乙酯、邻苯二甲酸二丁酯、邻苯二甲酸丁苄酯、邻苯二甲酸二辛酯五种邻苯二甲酸酯的标准混合物。结果表明,30min内五种邻苯二甲酸酯得到了较好的分离。以峰面积定量。在质量浓度为4～50mg／L的范围内,邻苯二甲酸酯的标准曲线具有良好的线性相关性。相关系数均大于0．999。相对标准偏差在0．98％-6．16％。运用该法对塑料工业废水中邻苯二甲酸丁苄酯的含量进行测定．加标试验回收率在104．8％-108．9％之间。     

聚乙二醇相转移催化合成邻苯二甲酸丁苄酯研究

采用不同的相转移催化剂合成了邻苯二甲酸丁苄酯。分子量为８００的聚乙二醇作相转移催化剂,ＮａＯＨ浓度为３７％～４０％时,可获９３％以上的产品收率,且操作简单、产品色泽好。     

聚乙二醇相转移催化合成邻苯二甲酸丁苄酯研究

采用不同的相转移催化剂合成了邻苯二甲酸丁苄酯。分子量为８００的聚乙二醇作相转移催化剂,ＮａＯＨ浓度为３７％￣４０％时,可获９３％以上的产品收率,且操作简单、产品色泽好。     

氯化苄下游产品开发建议

介绍氯化苄国内外消费结构,建议开发苯乙酸邻苯二甲酸丁苄酯和苯甲醛 。     

高色泽邻苯二甲酸丁苄酯的脱色研究

选择不同的脱色剂对高色泽邻苯二甲酸丁苄酯进行脱色处理;考察了温度、时间及脱色剂用量对脱色效果的影响。在６０℃,用质量分数ｗ＝３．０％的脱色剂Ａ处理色泽为３５０＃的丁苄酯３０ｍｉｎ,过滤后滤液色泽为１００＃（铂－钴比色）。     

一步合成邻苯二甲酸丁苄酯

1 前言 随着我国PVC制品的产量迅速增加,对增塑剂的需求增长很快,使主要增塑剂邻苯二甲酸二异辛酯(DOP)处于长期供不应求的状态中,而邻苯二甲酸二丁酯(DBP)国外已开始逐步陶汰,邻苯二甲酸丁苄酯(BBP)在增塑剂中所占的比重一直很低。因此发展特殊性能的BBP已经是势在必行。2 性质 邻苯二甲酸丁苄酯,分子式C_(19)H_(20)O_4结构式     

高色泽邻苯二甲酸丁苄酯的脱色研究

选择不同的脱色剂对高色泽邻苯二甲酸丁苄酯进行脱色处理；考察了温度、时间及脱色剂用量对脱色效果的影响。在６０℃，用质量分数ω＝３．０％的脱色剂Ａ处理色泽为３５０＾＃的丁苄酯３０ｍｉｎ，过滤后滤液色泽为１００＾＃（铂－钴比色）。     

邻苯二甲酸丁苄酯的试制

确定了邻苯二甲酸丁苄酯的最佳合成工艺条件,所得产品质量达到国外水平。     

丁辛醇的技术进展和市场分析

丁醇和辛醇(2-乙基己醇，2-EH)是重要的精细化工原料，用途十分广泛。丁醇可用作溶剂、生产邻苯二甲酸二丁酯(DBP)、邻苯二甲酸丁苄酯(BBP)等增塑剂及醋酸丁酯、甲基丙烯酸丁苄酯等化学品。辛醇主要用于生产邻苯二甲酸二辛酯(DOP)、己     

欧盟禁止儿童玩具和护理用品使用某些邻苯二甲酸酯

欧盟国家一致同意永久地在儿童玩具和儿童护理用品中限制使用某些邻苯二甲酸盐类(或酯)。欧盟新法规规定，禁止在各种儿童玩具和儿童护理用品中使用邻苯二甲酸二(2-乙基己)酯(DEHP)、邻苯二甲酸丁酯(DBP)和邻苯二甲酸丁苄酯(BBP)；3岁以下儿童玩具中禁止使用邻苯二甲酸二异壬酯(DINP)、     

乙烯酮(双乙烯酮)下游产品废水的治理技术

乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

三种煤样燃烧热的测定

本文通过三个厂家提供的三种煤样燃烧热的测定,由测定结果综合得出3号煤样燃烧最完全、燃烧热也最大,是三个煤样中最好的一种。     

Semi-empirical equation of state of metals. Equation of state of aluminum

A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO₂) of density 0.08 g/cm³. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008.     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

小议汽车涂装工艺设计对涂装成本的影响

论述了涂装工艺设计对涂装设备投资、涂装生产成本的影响。     

Measurement of the gradient of viscosity with composition of mixtures of non-ideal gases

A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%.     

Calorimetric and Computational Study of Enthalpy of Formation of Diperoxide of Cyclohexanone

A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out.     

塔设备改造选型的分析

就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后，着重介绍一种新型塔板（导向梯形浮阀塔板）和一种新型填料（波环填料——乾隆帕克）。     

Effect of degree of deacetylation of chitin on the properties of chitin crystallites

In the present article, chitin from crab shell was systematically deacetylated using a NaOH treatment with control of the reaction time. The degree of deacetylation, monitored using solid-state NMR, revealed that the reaction was pseudo-first order. Based on this, swollen and NaOH-saturated particles are proposed as the reaction system. The weight loss of the partially saponified and neutralized samples after HCl hydrolysis increased linearly with the degree of deacetylation. The crystallinity of the samples was found to increase after acid hydrolysis. According to conductimetric titration, the surface charge density of the crystallites, after acid hydrolysis, was found to increase with base treatment time. The effect of surface charge on the formation of a chiral nematic phase, due to the rodlike nature of the crystallites, was explored. These results show that because the contribution of charged particles to the ionic strength was significant the double layer compression was affected, especially since the surface charge density was close to the Manning limit. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:373–380, 1997