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7Â¥2008-10-15 13:11:24
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It may take some time.
2Â¥2008-10-15 10:09:36
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Deasenic catalyst of C-01 lead serie has been enhansed in quarlity based on deasenic catalyst which used for selective hydrogenation to imported mixed C2-C3 compounds,(eg.selective hydrogenation of acetylene to ethylene,  propyne to propylene) which takes a long catalytical life, remains high hydrogenation activity, removes side n reactions when hydrogenation, and so on.
One must have deasenic catalyst of C-01 lead serie reacted before use in order to remove moisture in it. conditions for activation are as follows: heating air or nitrogen to 100 ~ 230 ¡æ, with a speed of 100 to 800 L per minute up the bed, then rising bed temperature to 100 ~ 200 ¡æ, maintaining activating temperature 24 to 48 hours.Then stop air, give nitrogen to get down to room temperature,make it confined.Operation of dehydration can use liquid nitrogen. Once activated,dearsenic catalyst can be used until its deactivation. Before replace of the catalyst,it is better to use nitrogen flow get out of the air lasting for 5 to 6 hours until the temperature get down to 25¡æ.
3Â¥2008-10-15 11:11:49
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synthesis of chiral allylic alcohols with tetrasubstituted olefins

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