查询词典 sieve method

After improvement method of sieving. It can proceed the sieving to the single species pesticide liquid, and also fit to multi-specieses pesticide liquid or unknown pesticide liquid, the ratio of volume does not completely together whole 10. Compare with the former, the later has some advantages like easy to operate, economic, easy to control in operating temperature (30℃), breadth application and sieve speed quick (10 min/each), etc. It is very suitable for pesticide factory to produce emulsifiable solution.

改进后的筛选方法，二者的体积比则不凑整10，既可对单品种农药液进行筛选，也可对多品种农药液或未知农药液进行筛选，与前者相比，后者具有操作方法简便、经济、操作温度易控制(30℃)、应用范围宽、筛选速度快（10min/个）等优点，非常适合农药厂家在生产乳油时应用。

Enichem which use the catalysts of improving gmolecular sieve and metal oxide and heteropoly compounds will be most popular method.

其中改进了Enichem法的分子筛和金属氧化物以及杂多化合物为催化剂的方法逐渐占据了主流。

In the preparation method, the raw materials of houghite compound, the alumina, the silica and the molecular sieve are mixed uniformly; then an obtained mixture is molded; the compound is dried and calcined.

其制备方法为：将原料水滑石类化合物、氧化铝、氧化硅、分子筛混合均匀；然后将所得混合物进行成型；将上述化合物进行干燥焙烧。

Hybrid mesoporous molecular sieve materials with hexagonal mesoporous structure and covalent bonded polyoxometalates were synthesized based on tetraethoxysilane anti lacunary polyoxometalate, SiW11, via sol-gel method in the presence of triblock copolymers P123 as the structure-directing agent. The influences of molar ratio of inorganic precursors and aging temperature on the structure and the loadings of SiW11 in the hybrid materials were investigated. Some reaction details in the synthesis were revealed.

用嵌段共聚物P123为模板剂，正硅酸乙酯和缺位结构的多金属氧酸盐SiW11为无机前驱体，由溶胶－凝胶法合成了具有六方结构和SiW11共价键联的介孔分子筛杂化材料SiW11/SBA-15，着重考察了无机前驱的配比和老化温度对杂化材料结构及SiW11负载量的影响。

Secondly, the silver based catalysts modified by phosphorus, zirconium, zinc, potassium and so on using molecular sieve as carrier, which were produced by ion-exchange method, had also good catalytic performance for 1,2-propane glycol oxidation to methylglyoxal. The conversion of 1,2-propane glycol and the selectivity of methylglyoxal were both high, and the impurity such as formaldehyde and acetaldehyde in the product is little. At the condition of the temperature 300 ℃, the molar ratio of oxygen to 1,2-propane glycol 1.7:1, the space velocity 6000h~(-1), and the concentration of 1,2-propane glycol 70wt%, the conversion of 1,2-propane glycol is 90% and the selectivity of methylglyoxal is 45% on the Ag-P catalyst.

其次对采用离子交换法制备的负载在分子筛上的银系催化剂进行了研究，发现此催化剂在助催化剂磷、锆、锌、钾等的作用下对丙二醇的低温氧化脱氢具有很高的活性，可以得到较好的丙酮醛的收率，并且产物中的甲醛、乙醛副产物的量比较低；经过对Ag-P催化剂上反应条件的考察，发现当温度为300℃、氧醇比1.7：1、空速6000h~(-1)、丙二醇浓度为70wt%时，丙二醇的转化率为90%，丙酮醛的选择性为45%。

The method comprises heating up the lactic acid solution to gasify at 150-200 degree C, mixing the obtained mixed vapour of lactic acid and water with the carrier gas, entering into gas-solid catalytic reactor to get the reaction product gas by the action of a modified Y zeolite molecular sieve catalytic agent and dewatering after heating up the mixed gas to 200-450 degree C, obtaining the propenoic acid solution through gas-liquid dissociation after cooling the reaction product gas, obtaining coarse propenoic acid products form the propenoic acid solution by gas stripping, azeotropic distillation, extraction and rectification in turns.

其特征在于将乳酸水溶液加热至150～200℃气化得到的乳酸-水混合蒸气与载气混合，将混合后的气体继续加热到200～450℃后进入气-固相催化反应器中经改性Y沸石分子筛催化剂作用脱水得反应产物气体，反应产物气体冷却后经气液分离得到丙烯酸溶液，丙烯酸溶液再依次经过气提、共沸蒸馏或萃取、精馏得到粗丙烯酸产品。

The method can reduce residual carbon content on carbon containing molecular sieve catalyst to 0.1% by weight and produced regenerant has high structure-reserving property.

该方法可以将含碳分子筛催化剂上的残碳量降到0.1重％以下，所得再生剂具有高结构保留度。

By the use of a weighting method the ash formation distribution of coal with a wide sieve fraction can be obtained.

通常情况下，可以通过机械振筛的方法得到煤灰的粒径分布，清华大学采用 85 0℃的温度下将约 2kg的某窄筛分煤样在马福炉内静态燃烧，然后将收集的灰样在振筛机中用 2 。0mm振幅冷态振筛 5 0min的方法来研究了几种煤种的成灰特性，得到煤灰的初始粒径分布

Vacuum impregnation method was developed, in which the molecular sieve SBA-15 with a pore size of 36 ran was selected according to the size of the hydrated form of POM.

与此相比，利用较小孔径的分子筛SBA一巧(7 。7nln)作为载体，采用同样方法组装时，由于孔径的限制，POM水合作用的影响，POM在孔道内以单分子的形式存在，难以在孔道内形成纳米晶体。

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