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Not only can be used as an ideal dimethyl ether, or the clean alternative energy of chemical raw materials. Syngas direct production dimethyl ether broke the methanol synthesis of thermodynamics, improving the limit of one-way conversion, and the synthesis process route has obvious advantages. Direct synthesis of dimethyl ether as catalyst, double function catalyst with methanol synthesis function and methanol dehydration function. If the methanol synthesis components and methanol dehydration matching component "synergy, catalyst is good activity and selectivity. Therefore, the development of the double function catalyst has important academic value and practical value.
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chengcj.2008

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5Â¥2008-12-31 18:47:04
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chengcj.2008

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Studies on the one-step preparation of dimethyl ether from syngas

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     Dimethyl ether is not only ideal clean energy source, but important chemical materials. The method for the production of dimethyl ether directly from syngas is not limited by thermodynamics like methanol, together with high conversion per pass and good processing route. The catalyst is called bis-function catalyst which catalyzes both the synthesis dehydration of methanol. The catalyst will has good activity and selectivity if the synthesis and dehydration of methanol are "synergic". Therefore, study on the bis-function catalyst with good property is significant in academia as well as application.
6Â¥2008-12-31 19:06:08
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asi19

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[ Last edited by asi19 on 2009-1-1 at 09:13 ]
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7Â¥2009-01-01 09:02:42
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chengcj.2008

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The synthesis and processing conditions of the bis-function catalyst for dimethyl ether were studied by using fixed bed reactor in the paper. The optimal molar ratio of the components of methanol synthesis as well as that  of methanol synthesis and methanol dehydration. A series of catalysts were prepared utilizing mechanical mixed method, chemical co-precipitation depositon method, colloid deposition method and colloid impregnation mehtod, respectively. Auxiliary agent A, B and C were also used. The influence of different preparation method and auxiliary agent on the activity and selectivity of the catalyst were researched, and the characterizaton of the catalyst was performed by XRD diffractor. Finally, effect of the factors such as temperature, pressure and space velocity on the  activity and selectivity of the catalyst were studied, and the optimized processing conditions were obtained.
     Situation of the  world dimethyl ether-producing enterprises   
unit: kiloton per day
8Â¥2009-01-01 12:12:53
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asi19

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[ Last edited by asi19 on 2009-3-12 at 19:08 ]
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9Â¥2009-01-01 14:16:16
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chengcj.2008

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²»ºÃÒâ˼, Ê×ÏȸüÕýÒ»ÏÂ: Ë«´ß»¯¼ÁÓ¦ÒëΪ bifunctional catalyst.
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The results indicate that the catalyst avtivity is the highest when the molar ratio of copper, zinc and aluminum is a£ºb£ºc, and the weight ratio a£ºb of the components of methanol synthesis and methanol dehydration corresponds to the best catalyst activity and selectivity of dimethyl ether. Various preparative methods were listed as follows according to the catalyst activity and selectivity:  colloid impregnation method > colloid deposition method > co-percipitation deposition method > mechanical mixed method. Auxiliary agent A, B and C were added in the mechanical mixed method, respectively. The function of auxiliary agent was given in a decreasing order:
A£¾B£¾C. The same order of the auxiliary agents was obtained in colloid impregnation method, i.e. A£¾B£¾C.  After different contents of auxiliary agent A were used in the mechanical mixed method, co-percipitation deposition method,  colloid deposition method and colloid impregnation method, the optimal content of A is a% according to the catalyst activity and selectivity. The reaction equilibrium time for dimethyl synthesis was a h, and the optimal synthetic conditions of dimethyl ether bifunctional catalyst were: t=a¡æ£¬P=bMPa£¬n(H2)/n(CO)=c£¬space velocity d h-1¡£
10Â¥2009-01-01 17:10:37
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