甲苯甲烷氧化偶联制苯乙烯的研究

对甲苯甲烷氧化偶联制苯乙烯的工艺、催化剂、反应机理等方面的研究进展进行了评述，提出了今后研究的方向。     

水中甲苯的不确定度分析与评定

介绍了澳大利亚检测机构NARL对水中苯、甲苯、乙苯、二甲苯进行气相色谱-质谱联用分析,通过建立数学模型,识别不确定度的来源主要有浓缩时的气体流速、温度、玻璃量器的使用情况及气质联用仪的操作情况,评定不确定度的每一分量主要有方法回收率、样品回收率、均匀性、精密度、变异系数,据此方法可得到其他的苯系物成分的不确定度.所得结果符合ISO/IEC17025的要求.该方法具有快速、准确的特点.     

Removal of Low Concentration Toluene Vapor in a Biotrickling Filter

A laboratory-scale biotrickling filter packed with ceramic lasing rings is built to remove artificial toluene vapor. The performance of biotrickling filter under different superficial gas velocities and inlet toluene concentrations is evaluated. The start-up period is 6 days by using the novel “gas-liquid phase synchronic inoculation“ method and adding the optimal components nutrient liquid. The experiments lasts 3 months, and different sets of continuous tests are conducted at an inlet toluene concentration ranging from 30 mg/m3 to 1 223 mg/m3 and at superficial gas velocities ranging from 123 m/h to 370 m/h (corresponding to residence time 9.75-29.3 s). The effect of nutrient liquid recycling rate on biotrickling filter performance is also evaluated. The result shows that the maximum elimination capacity is 152.1 g/(m3*h) at the inlet toluene concentration of 1 223 mg/m3 and the superficial gas velocity of 205 m/h(corresponding to a residence time of 17.6 s). The average toluene removal efficiency reaches 80% in the experiments period, and high water content has a negative effect on biotrickling filter performance. The microscope observation of the micro-organism in the biofilm shows that the Pseudomonas is the dominant group of the mixing microbial culture in the biofilm.     

Convenient synthesis of sulfonamides from amines and p‐toluene sulfonyl chloride mediated by crosslinked poly(4‐vinylpyridine)

A general, mild, and convenient method has been developed for the synthesis of various N‐substituted and N, N‐disubstituted sulfonamides, as a class of sulfa drugs, from the corresponding amines and p‐toluene sulfonyl chloride in the presence of readily available crosslinked poly(4‐vinylpyridine) as a catalyst, base or polymeric substrates. The use of polymeric catalyst simplifies routine sulfonylation of amines because it eliminates the traditional purification. The polymer can be removed quantitatively and it can be regenerated and reused for several cycles without losing its activity. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

冷凝法甲苯回收系统设计优化

针对典型工业挥发性有机物（VOC）甲苯设计一套冷凝法回收系统。该系统制冷部分采用冰箱系统常用的分立多循环结构,将回收流程分为预冷级和冷却级。运用物性软件REFPROP及通用流程模拟软件Aspen Plus对甲苯负荷及制冷流程进行模拟。通过对系统的模拟运行,研究该冷凝法甲苯回收系统的工作性能以及能耗影响因素,为系统的进一步设计优化提供理论依据。     

基于镍铟水滑石的含异质结材料在甲苯检测中的应用

构建异质结构是提高气体传感器性能的有效方法之一。本工作通过在空气中高温煅烧不同Ni/In摩尔比的镍铟水滑石(NiIn-LDHs)合成了一系列含NiO-In2O3异质结的材料,通过氢气退火处理后,应用于甲苯气体检测。结果表明,当Ni/In为3.0,退火温度为500℃时,所得材料对0.005‰甲苯具有最高响应。此外,该材料还表现出针对其他干扰气体(如氨气、丙酮、高湿度水汽、三乙胺和二氧化硫)的高选择性和12天的连续测试的高稳定性。通过XPS、UPS等一系列表征证实,退火后形成的材料Ni/NiO-In2O3中存在肖特基能垒以及较多的氧空位,与P-N结的协同效应共同导致了其具有最佳气敏性能。     

芳烃联合装置在新形势下的运行优化

随着催化重整(简称重整)装置恢复高负荷运行、增产氢气以满足加氢装置提负荷需要,重整生成油产量增加,同时化工化纤市场低迷,中国石化洛阳分公司芳烃联合装置采用"抽提高负荷、对二甲苯低负荷"运行模式,重整生成油预分馏单元、液液抽提单元等高负荷运行,二甲苯装置歧化单元停运,异构化单元、二甲苯分馏单元和吸附分离单元低负荷运行;优...     

苯甲醛绿色生产工艺研究进展

甲苯直接氧化制备苯甲醛是一条最为简单而经济的生产工艺。详细介绍了近年来有关苯甲醛绿色生产工艺的研究进展,并指出了各自的优缺点。     

超临界甲苯降解聚苯乙烯反应动力学模型

引言 聚苯乙烯是一种性能优良、应用广泛的通用塑料,且可降解回收苯乙烯单体,因此废聚苯乙烯的回收利用受到广泛关注.但聚苯乙烯热降解高温熔融时黏度很大,造成温度分布不均和局部过热,容易发生二次反应并导致结炭,同时降低了苯乙烯单体收率,因此近年来发展了各种热解技术以抑制结炭、提高苯乙烯收率.超临界降解技术利用超临界流体优异的扩散性能和溶解性能,具有加快聚苯乙烯降解速率,提高反应转化率,抑制结炭等优点[1-4].