丁烷芳构化反应规律的研究

利用100 mL等温固定床实验装置,采用LAC芳构化催化剂,研究了丁烷芳构化生产芳烃的反应规律,主要考察了反应温度和空速对丁烷芳构化产品分布的影响。实验结果表明,高温和低空速可得到较高的液体收率和芳烃收率。随着反应温度的升高,丁烷芳构化反应的液体收率逐渐增大,同时干气产率也增加较快;随着进料空速的增大,丁烷芳构化反应的液体收率和干气收率逐渐减小,而液化石油气收率逐渐增大。反应温度和进料空速对n-C4H10的芳构化反应影响较大,而对i-C4H10的影响较小;i-C4H10较n-C4H10易转化为芳烃,当反应温度为460～540℃、质量空速为0.25～1.00 h-1时,以n-C4H10为原料能得到质量分数为17%～30%的轻质芳烃和质量分数为10%～16%的液化石油气,以i-C4H10为原料能得到质量分数为33%～41%的轻质芳烃和质量分数为21%～34%的液化石油气。在大量实验的基础上得到了丁烷单体烃芳构化反应的液体收率随工艺条件变化的经验关联式,利用此关联式在一定条件下可以预测不同组成丁烷芳构化反应的液体收率,关联式的绝对误差小于2.5%。

Study on aromatization reaction law of butane

The investigation of butane aromatization law on LAC aromatization catalyst was performed in a 100 mL isothermal fixed-bed pilot plant, The impact of the reaction temperature and weight hourly space ve- locity on product distribution and liquid compositions was studied. The test results showed that higher liquid yield and aromatics yield could be obtained at high temperature and low space velocity. With increasing reac- tion temperature, the liquid yield of butane aromatization reaction was gradually increased, while the dry gas yield was increased rapidly. With increasing of feed space velocity, the liquid yield and dry gas yield were de- creased, while the liquefied petroleum gas （LPG） yield was increased gradually. The reaction temperature and weight hourly space velocity had a greater impact on the aromatization of n-C4H10 and smaller impact on aromatization of n-C4H10. I-C4H10 was more easily transformed to aromatics than n-C4H10. When reaction tem- perature was 460-540 ℃ and weight space velocity was 0.25-1.00 h^-1 , 17% -30% light aromatics and 10% - 16% LPG could be produced from aromatization reaction of n-C4H10, and 33%-41% light aromatics and 21%-34% LPG could be yielded from aromatization reaction of n-C0H10. Based upon the experiments, the correlation about liquid yield and operation conditions was obtained. The correlation could be applied to pre- dict the liquid yield from mixed butane aromatization at different conditions. The absolute error of this correla- tion was less than 2.5 %.