| Summary: | 碩士 === 國立成功大學 === 化學工程研究所 === 83 === Maleimides is one of specialty chemicals which adds into pol-
ymers to use as plastics modifier.It can raise the HDT of
plasti- cs to improve the durability. Cyclohexyl maleimide is
one kind of Maleimides.It is the product of the reaction of
maleic anhydride with cyclohexylamine.We study under different
reaction condiction (reaction temperature,modes of feeding,
catalyst with various con- centration) to find the optimum
condition and to obtain the best yield. Experimental results
show that the higher the reaction tempe- rature the faster the
reaction rate.The yield of cofeed mode or semi-cofeed mode is
better than batch mode.Consider the convenie- nce and cost of
operation,semi-cofeed mode is better than cofeed mode.
Phosphoric acid is the catalysts of choice.With the recycle of
catalyst,phosphoric acid at 60% concentration in the first re-
action has the best efficiency.In the recycle runs,the yield is
proportion to the catalyst concentration. From the experimental
data we can obtain the reaction kineti- cs of
cyclohexylmaleimide,rCHMI =k[CHMAA]^a[H3PO4]^b,where the
reaction constant k is 1.59;the order of cyclohexyl maleiamic
acid (a) is 1.23;the order of phosphoric acid (b)is 0.523.
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