Chlorine removal from the pyrolysis of urban polyolefinic waste in a semi-batch reactor
Chlorine removal from the pyrolysis of urban polyolefinic waste in a semi-batch reactor
复制标题
DOI：
10.1016/j.jece.2020.104920
复制
发表时间：
2021-02-01
影响因子：
7.7
通讯作者：
Leeke, G. A.
中科院分区：
文献类型：
--
作者：
Torres, D.;Jiang, Y.;Leeke, G. A.
研究了城市含氯聚烯烃塑料废弃物的热解过程，同时保留HCl。在反应器内部或下游热过滤器中分别使用基于钠、钙和锌基的不同化学去除剂和基于氧化铝或沸石的不同吸附剂，用于热解油的氯去除和改质。首先，聚烯烃废物（POW，含有98.5重量%的聚烯烃）进行热重热解，以确定其热行为。随后，将化学去除剂与在半间歇式反应器中在480 ° C下热解的POW混合。在热解反应器下游的热过滤器（300 +/-20 ° C）中单独测试吸附剂。热解后，在热过滤器中含有化学去除剂和吸收剂的所得焦炭通过FTIR、CHN元素分析和ESEM-EDS分析以确定它们各自的氯含量。当用于与POW直接接触时，化学去除剂的最高氯保留率为23.8重量%，而用于热过滤器（气流）的沸石的氯保留率为65.6重量%。热解液体由C-7-C-40烃的混合物组成，所述烃由烯烃和脂族烃组成，具有非常低的芳族化合物存在（通过HPLC估计低于3wt%）。在大多数情况下，除氯过程导致蜡状热解油和较高的支化度。
The pyrolysis of urban chlorine-containing polyolefinic plastic waste with simultaneous retention of HCl is investigated. Different chemical removers based on sodium, calcium and zinc bases, and different adsorbents based on alumina or zeolites were used inside the reactor or in downstream hot filters, respectively, for chlorine removal and upgrading of pyrolysis oils. Initially, polyolefin waste (POW, containing a 98.5 wt% polyolefins) was thermogravimetrically pyrolyzed to determine its thermal behaviour. Subsequently, chemical removers were mixed with the POW which was pyrolyzed at 480 degrees C in a semi-batch reactor. The adsorbents were tested separately in hot filters (300 +/- 20 degrees C) downstream of the pyrolysis reactor. After the pyrolysis, the resulting char containing the chemical removers and the absorbents in the hot filters were analysed by FTIR, CHN elemental analysis and ESEM-EDS to determine their respective chlorine contents. The highest chlorine retention was 23.8 wt% for chemical remover when used in direct contact with POW, while a zeolite used in the hot filter (gas streams) gave a chlorine retention of 65.6 wt%. The pyrolytic liquids consisted of mixtures of C-7-C-40 hydrocarbons made up of olefinic and aliphatic hydrocarbons with a very low presence of aromatics (estimated to be below 3 wt% by HPLC). In most cases, the chlorine removal processes resulted in waxier pyrolytic oils and with a higher degree of branching.