Improvement of the Benzene Yield During Pyrolysis of Terephthalic Acid Using a CaO Fixed-Bed Reactor
Improvement of the Benzene Yield During Pyrolysis of Terephthalic Acid Using a CaO Fixed-Bed Reactor
复制标题
DOI：
10.1021/ie102423m
复制
发表时间：
2011-06-01
影响因子：
4.2
通讯作者：
Yoshioka, Toshiaki
中科院分区：
文献类型：
--
作者：
Kumagai, Shogo;Grause, Guido;Yoshioka, Toshiaki
作为聚对苯二甲酸乙二醇酯（PET）降解产物的模型物质，研究了热解温度和对苯二甲酸（TPA）气体浓度对TPA降解的影响，重点是苯产量和碳质残留物的减少。使用充满 CaO 的螺旋管反应器对 TPA 进行脱羧。最佳结果是在 600 摄氏度和 TPA 气体负载量为 28 mg L(-1) 时获得的，苯产率为 84%。初始碳中，29% 保留在反应器中，由碳酸盐和碳质残余物组成。在所有反应条件下苯纯度均大于97wt%。低 TPA 气体负荷和高气体速度导致良好的苯收率和纯度，因为 TPA 气体在吸附前深深渗透到 CaO 固定床中。这导致 CaO 表面的 TPA 浓度较低，减少了相邻 TPA 分子之间的干扰并限制了碳质残留物的形成。
Effects of pyrolysis temperature and terephthalic acid (TPA) gas concentration on TPA degradation as a model substance for poly(ethylene terephthalate) (PET) degradation products were investigated with emphasis on benzene yield and decrease of carbonaceous residue. TPA was decarboxylated using a spiral tube reactor filled with CaO. The best results were achieved at 600 degrees C and TPA gas load of 28 mg L(-1) yielding 84% benzene. Of the initial carbon, 29% remained in the reactor, consisting of carbonate and carbonaceous residue. Benzene purity was more than 97 wt % under all reaction conditions. Low TPA gas loads and high gas velocities resulted in good benzene yields and purities because TPA gas deeply penetrated the CaO fixed bed before adsorption. This resulted in lower TPA concentration at the CaO surface, reducing the interference between neighboring TPA molecules and limiting carbonaceous residue formation.