Abstract The bio-oil properties and yields during pyrolysis at 400, 500 and 600 °C of the residues from the cultivation of the pepper in greenhouse (Capsicum annuum L.) were studied. Different solid samples were investigated: the biomass fraction of the residue, the water-washed biomass sample, the cobalt-loaded biomass sample and three mixtures made with the biomass and plastic fractions of the residue. Results showed that temperature of pyrolysis has a moderate impact on the products’ yields and bio-oil properties for all solid samples. In general, the highest bio-oil yield was achieved operating at 600 °C while the higher char yield was reached at 400 °C. The pH of all the bio-oil samples was low, specially bio-oil from the cobalt-loaded biomass sample. Density, viscosity, cetane number, average boiling temperature, flashpoint, elemental analysis and ash content of the samples were analyzed and compared. The highest higher heating value was achieved for bio-oil (4218.6 kcal/kg) obtained from pyrolysis of the cobalt-loaded biomass sample. Infrared spectra and chromatography analysis revealed the presence of numerous compounds. Acetic acid is the main acid component of the bio-oil samples obtained from the biomass, the water-washed biomass and the cobalt-loaded biomass, although there are some differences in relative area. Other compounds such as ketones, phenolic or furans were also found. In bio-oils obtained from biomass and plastic mixtures, in general there was a decrease in the content of oxygenated compounds and acidic compounds, favoring the presence of non-oxygenated compounds. This work shows the feasibility of the obtaining of bio-oil from the greenhouse crop residue at the temperature range between 400 and 600 °C.

中文翻译：

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不同预处理和添加塑料对温室作物残留物热解获得的生物油特性的影响

摘要 研究了温室辣椒（Capsicum annuum L.）栽培残留物在400、500和600°C热解过程中的生物油特性和产量。研究了不同的固体样品：残渣的生物质部分、水洗的生物质样品、负载钴的生物质样品以及用残渣的生物质和塑料部分制成的三种混合物。结果表明，热解温度对所有固体样品的产品收率和生物油性质有中等影响。一般而言，在 600 °C 下操作可实现最高的生物油产量，而在 400 °C 下可达到较高的焦炭产量。所有生物油样品的 pH 值都很低，特别是来自负载钴的生物质样品的生物油。密度、粘度、十六烷值、平均沸点、闪点、对样品的元素分析和灰分含量进行了分析和比较。从负载钴的生物质样品的热解中获得的生物油 (4218.6 kcal/kg) 获得了最高的更高热值。红外光谱和色谱分析表明存在大量化合物。乙酸是从生物质、水洗生物质和载钴生物质中获得的生物油样品的主要酸成分，尽管在相对面积上存在一些差异。还发现了其他化合物，如酮类、酚类或呋喃。在从生物质和塑料混合物中获得的生物油中，通常含氧化合物和酸性化合物的含量减少，有利于非含氧化合物的存在。