甲醇制烯烃（MTO）装置副产混合碳五。为提高碳五组分的高值化利用，国能包头MTO装置采用再生催化剂输送管碳五回炼工艺。混合碳五预裂解增产乙烯和丙烯，同时实现对催化剂的预积碳，提高MTO催化剂活性。通过对比碳五回炼前后装置产出组分的差异，分析碳五回炼对MTO反应性能的影响，结果表明，乙烯和丙烯总收率提高1.03%，乙丙比（乙烯和丙烯比值）降低0.011，综合经济效益提高2 512元/h。

A methanol to olefin (MTO) plant mainly produces ethylene, propylene and mixed C₅ fractions.In order to improve the high-value utilization of C₅ fractions, the Baotou MTO plant adopts a C₅ fractions reprocessing process in regenerated catalyst delivery pipe.Mixed C₅ fractions reprocessing can increase the production of ethylene and propylene, and at the same time realizes pre-carbon deposition on the catalyst to improve its activity.The effect of C₅ fractions reprocessing on MTO reaction performance is analyzed through comparing the differences in the production components of the plant before and after reprocessing C₅ fractions.It is indicated that total yield of ethylene and propylene increases by 1.03%, the ethylene-to-propylene ratio decreases by 0.011, and comprehensive economic benefits increases by RMB 2 512 per hour.