查询词典 dimethyl ether

Kinetics of methanol dehydration to dimethyl ether on modified kaolin catalyst was studied in an integral reactor under normal pressure. It is deduced that the surface reaction of methanol molecule adsorbed on the active site of catalyst with methanol molecule in gas phase is the rate determining step. The hyperbolic type kinetic equation r=ksbMpM2/(1+bMpM+bpE) is obtained according to the theory of langmuir even adsorption and using the R-E mechanism.

采用积分反应器，考察了常压下在改性高岭土催化剂上甲醇脱水生成二甲醚的反应动力学，根据Langmuir均匀吸附理论，采用R-E机理，推断吸附的甲醇分子与气相主体中的甲醇分子发生的表面反应为速率控制步骤，得到双曲线型动力学方程为： r= ksbMpM2 /(1+bMpM+bpE)（r为反应速率， ks为反应速率常数， bM为甲醇的吸附平衡常数， b为二甲醚和水的吸附平衡常数之和， pM、 pE分别为甲醇、二甲醚的分压）。

After t he critical opalescence phenomenon was studied systematically with dimethyl ether and HFC152a (1,1-difluoroethane), we found, there are some shortages and faults in the classical method to determine the critical parameters.

本文以二甲醚和 HFC152a 为实验对象，对流体临界乳光现象进行详细的实验研究。

Liquefied petroleum gas and dimethyl ether are Group A dangerous chemicals.

液化石油气和二甲醚均属甲类危险化学物品。

Using high speed photograph and laser shadowgraph method, the effect of opening pressure of injection nozzle, environment pressure and injection orifice diameter on spray characteristics of dimethyl ether are studied by using a pressure bomb, and are compared with those of diesel.

采用高速摄影和激光阴影法在压力容弹中研究了喷油嘴启喷压力、环境介质的密度、喷孔直径等参数对二甲醚喷雾特性的影响，并与柴油的喷雾特性进行了对比。

Experimental study on enhanced deaquation process for extra-heavy crude oil using dehydrant ;2. DMF refining by molecular sieve as dehydrant ;3. Hybrid catalysts composed of JC207 methanol synthesized catalyst and dehydrant (HZSM-5 zeolite or γ-Al2O3) were prepared for the synthesis of dimethyl ether.

采用甲醇合成催化剂JC207和固体酸脱水剂(HZSM-5分子筛或γ-Al2O3)混合制得合成二甲醚双功能催化剂，并在固定床反应装置中进行了活性评价，考察了固体酸脱水剂的酸性对一步法合成二甲醚的影响。

Experiments were conducted to determine the intersolubility of Dimethyl Ether and diesel fuel in a thermo-physical property measuring system with high accuracy,which consists of temperature measurement system(measurement range-80~300 ℃with uncertainty less than ±0.002 ℃) and pressure measurement system(measurement range 0~2 MPa with uncertainty less than ±0.7 kPa).

利用高精度热物性测量系统对二甲醚与柴油的互溶性进行了实验研究。实验系统中温度覆盖范围为-80~300℃，测量不确定度小于±0.002℃；压力测量范围为0~2 MPa，测量不确定度小于±0.7 kPa。测量了10%、20%、30%的二甲醚/柴油混合燃料的饱和蒸气压力和临界互溶温度。研究表明：二甲醚与柴油互溶性良好。

Dimethyl ether ; RVP ; Intersolubility ; Engine

二甲醚；饱和蒸气压；互溶性；发动机

In this paper,the response factors of thermal conductivity detector of monochloromethane and dimethyl ether are estimated and calculated by using group cross section area method,molecular diameter method and homologue linear rule method.

热导校正因子的估算以及在工业氯甲烷生产中的应用李洪宽（山东省化工研究院色谱中心济南250014）关键词气相色谱法，一氯甲烷，热导检测器，校正因子1前言热导检测器定量校正因子的测定和计算是气相色谱热导定量的关键。

The calculated results indicate that the energy bathers for the formation of dimethyl ether and trimethyl oxonium ion inside HSAPO-34 zeolite are 1.68 and 0.93 eV, respectively. The suggested intermediate oxonium ylide is very unstable and the energy barriers for the formation of C-C bond are over 3.0 eV by concerted pathway.

结果表明，二甲醚和三甲基氧鎓离子在HSAPO-34分子筛上的生成能垒分别为1.68和0.93eV，中间体氧鎓叶立德不能稳定存在，同时表明C-C键通过协同反应形成的能垒均超过3.0ev。

Synthesis gas ; Hydrogenation ; Dimethyl ether ; Methanol ; Bif unctional catalyst ; XPS ; XRD

合成气；加氢；二甲醚；甲醇；双功能催化剂； XPS ； XRD

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。