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cwl type centrifugal extraction machine combined with levulinic acid extraction to extract the paper-making black liquor

by:Deyuan      2020-08-29
For the most part at present, China's paper industry with grasses as raw materials, mainly USES alkaline cooking process, cooking black liquor contains a lot of organic matter, caused serious harm to ecological environment, so the processing of alkaline straw pulp black liquor, especially in the comprehensive utilization, waste, recycling of the waste road has always been a sewage treatment enterprises, environmental protection project of research subject. This paper mainly introduces the papermaking black liquor extraction of levulinic acid in extraction process.
alkaline papermaking industry ( Caustic soda and sulfate method) Pulping process of waste water containing large amounts of lignin, dark brown, so called black liquor. Black liquor contains large amounts of suspended solids, organic pollutants and toxic substances, directly discharged into the water will cause serious pollution. Black liquor contains large amounts of suspended solids, organic pollutants and toxic substances, directly discharged into the water will cause serious pollution. The main hazards are: contains a lot of fiber, pigment and inorganic salt of papermaking waste water can make the water turned black, and have special stench; The papermaking black liquor containing high concentration of organic pollutants of biochemical oxygen demand ( 生化需氧量) Can be as high as 5000 ~ 40000 g/L, will be a large amount of consumption of dissolved oxygen in water, water quality; Alkaline substances in black liquor can make a dramatic increase in the pH of water, destroy the balance of the aquatic environment.
the paper mill according to the three water discharge process, the pulping cooking waste liquor, known as the papermaking black liquor; Second, after the separation of black liquor of pulp washing, selection and drift of water, also known as ZhongDuanShui; 3 it is dipping paper machine white water, water can be reuse after processing. ZhongDuanShui is not completely by the rest of the black liquor extraction should be within 10% of the total. In the black liquor pollution accounts for the plant contains pollutants emissions by more than 90% of the total. Therefore, the primary sources of pollution from black liquor is the paper mill.
raw materials such as paper making raw material the use of straw, both contain cellulose, lignin and hemicellulose ( Chitosan class) Three parts, paper only use one of the cellulose, Accounts for about 40%) , of which about 25% and accounts for about 28% of hemicellulose and lignin of xylose content, such as nitrogen and phosphorus, potassium, is with the black liquor. Contained in the black liquor lignin and hemicellulose and xylose, potassium, nitrogen, phosphorus and other substances, in the industrial and agricultural production has very high use value.
based on the research of the papermaking black liquor and alkali resistant strains is used to study the environmental protection workers make alkaline straw pulp black liquor fermentation, acid sinking again in the lignin, the supernatant fluid to concentrate containing sugar, add sulfuric acid after boiling, in 2-octyl alcohol extraction of levulinic acid, the extraction of levulinic acid in water, then through concentration, distillation, freezing, crystallization and high purity of levulinic acid. Used in the process of extraction. cwl type centrifugal extraction machine can improve the efficiency of production, belong to automatic operation, the operation flow ratio range is very wide. Can continuous uninterrupted operation, also can use small batch more varieties; Can be intermittent operation, can be a single run, also may need many sets of series operation according to the craft, unlimited number, installation, operation and maintenance is simple, you need less workers, can significantly reduce the labor intensity of workers and improve working environment, and a parking is convenient, easy to implement online analysis and automatic control, etc. Power can be run. Without the traditional process of high tower transporting fluid.
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