| The CTA-6 catalyst has been used in the production of acrylonitrile in the acrylic fiber plant of Fushun petrochemical company and the yield of acrylonitrile can reach to 79% above in the initial two years. Nevertheless, the yield of acrylonitrile can decrease about 1 % in the third and forth year, and will decline even much lower along with extension of using time. So the performance of catalyst has a great influence on the production of acrylonitrile. A kind of catalyst with higher catalytic activity can raise the yield of acrylic fiber products, lessen the use of material and energy, and improve the economic efficiency.On the basis of investigation of the application of C49MC,CTA-6,MB-98 catalysts in the acrylonitrile production of acrylic fibers plants of Fushun petrochemical company, the optimum choice of the catalyst has been made considering the acrylonitrile production ability of 104 t/a.By contrasting the performance of three catalysts under different operation conditions, the C49MC catalyst exhibited a best choice for the production of acrylonitrile in the acrylic fiber plant of Fushun petrochemical company. The effscts of the performance of C49MC catalyst on the reaction temperature,pressure,assignation ratio,WWH,yield,conversion and selectivity are studied in this paper.. The best operating condition of the C49MC catalyst is found out under the condition of the total yield of acrylonitrile of 80,000 t/a. And this optimum running condition has been used in the facilities, and the consumption of material and energy, the yield and product quality, the level of environmental protection and cost have also been evaluated.The specific consumption of propylene declines to an ideal level due to use of the C49MC catalyst, and the waste water produced by the acrylic fibers plant accords with environment request.Replacing new catalyst can recover cost in a short term. The yield can markedly exceed 76% in a long period, and the subsequent profit would be considerable.
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