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首页> 外文期刊>Waste management & research >Characterization of bio-oil and bio-char produced by low-temperature microwave-assisted pyrolysis of olive pruning residue using various absorbers
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Characterization of bio-oil and bio-char produced by low-temperature microwave-assisted pyrolysis of olive pruning residue using various absorbers

机译：使用各种吸收剂对橄榄修剪残留物进行低温微波辅助热解所产生的生物油和生物炭的表征

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Olive pruning residue is largely formed during cultivation, and is usually disposed through open-air combustion directly in the field, but this habit is a possible source of pollution. The pyrolytic conversion of olive pruning residue has been run in a new and very appealing way using microwave as a heating source and different microwave absorbers in a multimode batch reactor. In this way, olive residue is converted into interesting bio-chemical products with a short pyrolysis time, ranging from 15 to 36 min, and with a peak temperature ranging from 450 K to 705 K according to the different microwave absorber. Thus, a very efficient and selective system was realized, which was able to address the process towards the formation of a large amount of bio-char (up to 61.2%) or a high formation of bio-oil (56.2%) and gas (41.7%) with a very low formation of bio-char (2.1%). However, when carbon and iron were used as microwave absorbers, it was possible to obtain an intermediate amount of bio-char (26-30%) and bio-oil (40 wt%). Bio-oils were collected as dark-brown liquids with low viscosity and density. A bio-oil with a low water concentration was obtained using carbon or iron as the microwave absorber. The bio-oils formed in all experiments contained a very large amount of acetic acid, even when NaOH was the microwave absorber. Furthermore, a large amount of aromatics were present in the bio-oil obtained using carbon as the microwave absorber.
机译：橄榄修剪残渣主要在种植过程中形成，通常通过露天燃烧直接在田间进行处理，但这种习惯可能是污染的来源。橄榄修剪残渣的热解转化已经以一种新颖且非常吸引人的方式进行了，使用微波作为加热源，并在多模式间歇反应器中使用了不同的微波吸收剂。通过这种方式，根据不同的微波吸收剂，橄榄残渣可以在15至36分钟的短时间内热解时间转化为有趣的生物化学产品，并且峰值温度在450 K至705 K之间。因此，实现了一个非常有效和选择性的系统，该系统能够解决形成大量生物炭（高达61.2％）或大量形成生物油（56.2％）和天然气（ 41.7％）的生物炭形成率非常低（2.1％）。然而，当将碳和铁用作微波吸收剂时，有可能获得中等量的生物炭（26-30％）和生物油（40wt％）。收集的生物油为低粘度和低密度的深棕色液体。使用碳或铁作为微波吸收剂，可获得水浓度低的生物油。即使NaOH是微波吸收剂，在所有实验中形成的生物油也含有大量的乙酸。此外，在使用碳作为微波吸收剂而获得的生物油中存在大量的芳香族化合物。

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