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首页> 外文期刊>Journal of thermal analysis and calorimetry >TG-pyrolysis and FTIR analysis of chocolate and biomass waste
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TG-pyrolysis and FTIR analysis of chocolate and biomass waste

机译：TG-pyrolysis and FTIR analysis of chocolate and biomass waste

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摘要

Four waste streams from a chocolate factory were examined in view of their possible usage as a fuel: cocoa shell, jute bags, and two qualities of chocolate waste (milk, white). Thus, proximate and ultimate analyses and thermogravimetric analyses coupled with Fourier transform infrared (TG-FTIR) analyses were conducted. It was observed that milk and white chocolates have similar thermal properties; chocolate has a high calorific value (24.5 MJ kg~(-1)). Pyrolysis of chocolate proceeds in two stages: the first from 190 to 300 ℃ and the second from 300 to 518 ℃. During the first stage, alkaloids, such as theobromine and caffeine, evolve, and sugar decomposes, releasing acids, CO_2, and water. During the second pyrolysis stage, cocoa butter and proteins decompose releasing volatile organics such as esters, acids, amides, phenols, CH_4, CO, etc. Polyphenols such as catechin, procyanidins, etc. decompose during both pyrolysis stages. Generally, chocolate waste yields less CO_2 and CO than cocoa shell and jute. In principle, it appears to be a promising source of energy and could be utilized by both co-firing and pyrolysis, producing fuels or chemicals.

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