Selective production of benzene and naphthalene from poly(butylene terephthalate) and poly(ethylene naphthalene-2,6-dicarboxylate) by pyrolysis in the presence of calcium hydroxide
Selective production of benzene and naphthalene from poly(butylene terephthalate) and poly(ethylene naphthalene-2,6-dicarboxylate) by pyrolysis in the presence of calcium hydroxide
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DOI：
10.1016/j.polymdegradstab.2005.08.010
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发表时间：
2006-05
影响因子：
5.9
通讯作者：
T. Yoshioka;G. Grause;S. Otani;A. Okuwaki
中科院分区：
文献类型：
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作者：
T. Yoshioka;G. Grause;S. Otani;A. Okuwaki
以聚对苯二甲酸丁二醇酯（PBT）和聚2，6-萘二甲酸乙二醇酯（PEN）为原料，在Ca（OH）2存在下，在固定床反应器中进行热裂解，分别得到苯和萘。在这些实验中，使用不同比例的聚合物和Ca（OH）2。温度也在600°C至800°C的范围内变化。发现在700°C的温度和10的Ca（OH）2/PBT摩尔比下获得苯的最高产率（67%）。在这些条件下，实验后固定在反应器残余物中的碳的量从纯PBT的56%降低到38%。芳香族副产物也减少了，而1，3-丁二烯的量增加了。在Ca（OH）2的作用下，四氢呋喃生成.对于PEN，发现最佳条件为600°C的温度和Ca（OH）2/PEN摩尔比为5。由PEN制得的萘收率为80%。萘产率的提高是由于Ca（OH）2更有效地分解聚酯引起的，这导致实验后反应器残余物中的碳从纯PEN的59%减少到优化条件下的10%。芳香副产物部分变化不大。
Poly(butylene terephthalate) (PBT) and poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) were pyrolysed in a fixed bed reactor in the presence of calcium hydroxide (Ca(OH)2) in order to obtain benzene and naphthalene, respectively. In these experiments different ratios of polymer and Ca(OH)2were used. Also the temperature was varied in a range between 600°C and 800°C. It was found that the highest yield of benzene (67%) was obtained at a temperature of 700°C and a molar Ca(OH)2/PBT ratio of 10. The amount of carbon, fixed in the reactor residue after the experiment, was reduced from 56% for pure PBT to 38% under these conditions. Aromatic byproducts were reduced, as well, while the amount of 1,3-butadiene increased. Tetrahydrofuran was just formed under the influence of Ca(OH)2. For PEN, the optimal conditions were found at a temperature of 600°C and a molar Ca(OH)2/PEN ratio of 5. A naphthalene yield of 80% from PEN was obtained. The rise of the naphthalene yield was caused by a more effective decomposition of the polyester by Ca(OH)2, which led to the reduction of carbon in the reactor residue after the experiment from 59% for pure PEN to 10% under optimised conditions. The part of aromatic byproducts changed just slightly.