Studies on the pyrolysis proudcts of waste TN-liquid crystal

The pyrolysis weight loss of twisted nematic liquid crystal was studied in nitrogen atmosphere by TGAFTIR. The pyrolysis products from tube furnace experimental system were analyzed GC-MS. The result indicates that the temperature of initial weight loss is 120℃ and that of apparent weight loss is 220℃~430℃. The pyrolysis products are mainly aromatic compounds besides carbon dioxide, which include benzene, phenol, benzenefuran with 1~5 carbon functional groups, polycyclic aromatic hydrocarbons and hydrocarbon organic matters mainly composed of propane. Most of the organic matters are poisonous and harmful and can be harmless by further incinerating.