Views: 11 Author: James Gao Publish Time: 2021-10-13 Origin: Site
Promising prospects for Sugarcane bagasse pulping
With the development of modern agriculture, environmental pollution and resource waste caused by the accumulation of large amounts of agricultural waste have become increasingly prominent. Vigorously developing the comprehensive utilization of agricultural waste is of great significance for protecting the ecological environment and promoting the sustainable development of agriculture. Bagasse is the residue of sugarcane stem fiber remaining after sugarcane is crushed and pressed to extract sugarcane juice. Its content accounts for 24% to 27% of sugarcane. It is one of the largest agricultural wastes in the world. As the third largest sugarcane planting country in the world, China has an annual output of more than 20 million tons of bagasse. Compared with other agricultural wastes, bagasse also has the characteristics of concentrated sources, simple collection, small transportation radius, relatively stable composition, and uniform properties. Therefore, the development and utilization of bagasse resources has received extensive attention from domestic and foreign researchers.
Due to the high degree of lignification of bagasse and the lack of traditional conversion and utilization methods, its traditional utilization methods are limited to extensive and inefficient utilization such as boiler fuel combustion for power generation, and the utilization rate is extremely low, and most of the bagasse is directly discarded. Or landfill treatment. In recent years, with the continuous development of modern biomass conversion and utilization technologies, the utilization of bagasse has become increasingly diverse. The current domestic and foreign research mainly focuses on energy, feed, matrix and materialization. Among them, materialization is one of the important ways for high-value utilization of bagasse, and its development prospects are broad.
The chemical composition of bagasse is mainly lignocellulose. In the dry matter, cellulose accounts for 32%～48%, hemicellulose accounts for 19%～24%, lignin accounts for 23%～32%, and the ash content is about 4%. The chemical composition of bagasse makes it an ideal raw material for the development of environmentally friendly materials.
Bagasse can be used to produce household paper, such as toilet paper, napkins, packaging paper, corrugated paper, copper paper, copy paper and double offset paper. In my country, pulping and papermaking is the most important way of using bagasse besides being used as fuel. However, due to geographical and raw material restrictions, it is mainly concentrated in Guangxi, Yunnan and other areas where sugar companies are concentrated. The bagasse pulping and papermaking idea combined with biorefining is to obtain both pulp and high value-added chemicals, such as ethanol pulping, acetic acid pulping, high boiling alcohol pulping, etc., with solvents It has the advantage of being recyclable, and can separate and obtain hemicellulose, cellulose and lignin with high reactivity at the same time.
After bagasse pulping, it can be molded into disposable green tableware. This kind of tableware has sufficient strength, and is resistant to oil, hot water, non-toxic, tasteless, non-polluting, and biodegradable. It can completely replace plastic tableware. White pollution". According to reports, there are currently nearly 20 companies in Guangxi that use bagasse to produce green tableware. In addition to supplying the domestic market, the products are also exported to Japan, South Korea, the United States, Spain and other countries.