Abstract
Greening waste presents considerable reuse potential owing to its simple organic composition. For greening waste, being simply regarded as ordinary garbage cannot adapt to the requirements of sustainable and harmless development. Resource reusing process is an inevitable trend. Utilization of urban landscape greening waste is of great significance for improving the ecological environment in urban and rural areas, building a harmonious city, increasing employment, and enhancing economic efficiency. This will be a far-reaching impact on China's economic and social sustainable development. In this work, eight typical landscape plants were selected as raw materials using the batch reactor. The concept of stepwise hydrothermal conversion and a real model with xylose, cellulose acetate (CA), and aromatic aldehyde as the target products were thereby constructed. In the third step of the stepwise conversion, the effect of reaction temperature and time in the oxidative degradation of cellulose acetate solid residues in NaOH solution to produce aromatic aldehyde was investigated. The optimum conditions were obtained as 175 ℃ and 90 min. The yield of aromatic aldehydes in all 16 branches and leaves of cellulose acetate all reached about 20% under the optimal conditions.
Highlights
1.1 Preparation of aromatic aldehydes by wet oxidative degradation of ligninWet oxidation refers to the process in which organic or inorganic substances in aqueous solution or suspension are oxidized by oxidants at higher temperature and pressure [1,2]
Catalysts are usually used in wet oxidation of lignin to improve the yield of aromatic aldehydes
The mass weight of aromatic aldehydes in the extracted liquid was determined by GC-MS external standard method (e.g., Fig. 1, 2, 3 and 4), and the yield of aromatic aldehyde was calculated based on the weight of cellulose acetate residues
Summary
Wet oxidation refers to the process in which organic or inorganic substances in aqueous solution or suspension are oxidized by oxidants at higher temperature and pressure [1,2]. Most of the wet oxidative degradation of lignin is used to produce aromatic aldehydes, such as vanillin (VLA), syringaldehyde (SA) and p-hydroxybenzaldehyde (PHBA) [4,5,6]. These compounds have many applications, especially vanillin is widely used in food, cosmetics, and pharmaceutical industries as condiments and spices. Among these products, only vanillin has been industrialized
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