查询词典 xylenes

DETERMINATION OF CORROSIVE SULPHUR IN TOLUENES,XYLENES AND SOLVENT NAPHTHAS.

甲苯、二甲苯和石脑油溶剂腐蚀硫的测定。

It is well known that aromatics are key raw materials and important starting materials for many intermediates and petrochemicals, playing an important role in the modern national economy, benezene, toluene and xylenes in particular.

芳烃是重要的基本有机化工原料，尤其是苯、甲苯和二甲苯，在现代国民经济中有着极其重要的地位和作用。

Another important group of petrochemical raw materials are the aromatic compounds, principally benzene, toluene and xylenes, which are mainly produced by catalytic reforming.

另一组重要的石油化学品原料是芳香烃化合物，主要是苯、甲苯和二甲苯，主要由催化重整制得。

Because benzene and xylenes are being recovered as higher valued products, most of the heavy FCC gasoline must be reformed to recover gasoline pool octane.

由于苯和二甲苯恢复作为更高的被重视的产品，大多数重的FCC 汽油必须被改革恢复汽油水池八炭烷。

In this study, indoor and outdoor concentration levels of twenty-one carbonyl compounds and five BTEX (benzene, toluene, ethylbenzene and xylenes) were measured in four hospitals of Guangzhou.

大多数羰基化合物和BTEX的I/O比都大于1，说明这些物质有一定的室内来源。

However, according to the Journal of Pesticide Reform, xylenes, used as solvents in some chlorpyrifos-containing products, have caused increased rates of leukemia among exposed workers.

但根据《农药改革杂志》记载，使用二甲苯作为溶剂的毒死蜱产品，引致接触该农药的工人白血病患病率增加。

The average of sum concentrations of five BTEX varied from 10.61 to 253.35μg/m^3.Toluene was the most abundant BTEX. All concentrations of benzene, toluene and xylenes met the Indoor air quality standard of China, and were lower than those observed in the hospitals of other countries.

结果表明，4家医院的5种BTEX的总浓度平均值为10.61~253.35μg/m 3.5种BTEX中，以甲苯的浓度最高，但均低于国家室内空气质量标准的阈值，也低于国外医院室内空气BTEX的浓度。

Objective To establish a gas chromatographic method with carbon disulfide desorption for benzene ,toluene and xylenes in time-weighted averageconcentration in the workplace air.

目的 建立工作场所空气中苯系物的时间加权平均浓度气相色谱测定方法。

There existed the specific interaction of xylenes molecule with framework of CoAlPO〓-5 due to introduction of Lewis sites by Co substitution, while xylenes were just condensed in AlPO〓-5, which would cause different adsorption selectivity of xylenes in them.

钴同晶取代AlPO〓-5分子筛骨架中的铝所引入的Lewis酸中心使二甲苯分子与骨架之间存在特殊相互作用，而二甲苯仅仅是浓缩在AlPO〓-5分子筛孔道中，这使得二甲苯在它们中的吸附选择性不同。

This research discussed the treatment of the Fenton's agent of the in-situ chemical oxidation on contaminated groundwater polluted by benzene, toluene, ethylbenzene, and xylenes released from gasoline. The above treatment was evaluated by virtue of the literature review, principle of remediation, removal efficiency, real remediation cases and cost in order to clearly understand its merit, constraints, the best way to implement and to provide the domestic practitioners for assessing the remediation technique considering the economic benefit and the remediation schedule.

中文摘要本研究探讨以现地化学氧化法(in-situ chemical oxidation， ISCO)之Fenton's试剂处理汽油中苯、甲苯、乙苯、二甲苯(benzene、toluene、ethylbenzene、xylenes，BTEX)污染地下水之实际案例，经由相关文献资料、整治原理、去除效率、现场整治案例成效及成本等进行评析，以更清楚掌握其优点、限制及最佳之施用方法，做为国内相关人员在经济效益及污染整治时程上考量，评估该污染整治操作技术之应用参考。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐