Analysis on the Characteristics of Liquid Product Obtained From Slight-carbonization Drying Process of Bamboo
Bamboo was dried by slight-carbonization process in a fixed bed reactor,and the drying exhaust gas was condensed and recovered.The effect of slight-carbonization drying process on the properties of condensed liquid products from bamboo was discussed.The results showed that the condensed liquid obtained from the slight carbonized drying of bamboo at 210℃ mainly contained acids,aldehydes,esters,ketones and phenols.The slight-carbonization process had a significant effect on the properties of bamboo drying liquid products.The controlled temperature conditions showed that aldehydes were produced at 210 ℃,and the mass fraction was 22.14％.Alcohols and phenols were produced at 250 ℃,which were 25.13％and 28.33％,respectively.The heating rate leaded the acid and aldehyde substances to increase first and then decrease,and the maximum values were 67.89％and 22.14％at 10 ℃/min,respectively.The change trend of ketones was opposite,and the maximum was 21.35％at 20 ℃/min.With the increase of nitrogen flow rate,acid substances increased from 51.84％to 81.71％,and aldehydes and esters decreased from 26.07％and 10.95％to 8.36％and 2.58％,respectively.The composition of bamboo slight-carbonization drying liquid products was similar to that of wood vinegar and bamboo vinegar,and it had the potential to be used as plant growth promoter and soil amendment.
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