Method for producing aromatic aldehyde by degrading lignin separated and coupled from cellulose component
A lignin and cellulose technology, applied in chemical instruments and methods, preparation of organic compounds, carbon-based compounds, etc., can solve problems such as uneven molecular weight, large steric hindrance, and low lignin reactivity
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Embodiment 1
[0021] Corn cobs were added with dilute sulfuric acid solution at a solid-to-liquid ratio of 1:7 (weight to volume ratio, g:ml, the same below), with a sulfuric acid concentration of 1.0%, and cooked at 115°C for 150 minutes. After the reaction, centrifuge to separate the solid from the liquid. The liquid is used to produce sugar alcohol products. After the solid is washed with hot water, the acid hydrolysis residue is obtained, in which the cellulose content is 62.45%, the hemicellulose content: 4.17%, and the lignin content: 22.83%, ash content: 2.29% (the contents are all calculated on a dry basis, the same below), and other components are 8.26%.
[0022] The acid hydrolysis residue is further subjected to the separation of cellulose components. The reaction was carried out in a stainless steel reactor. The reaction conditions of lignin wet oxidation are: 140°C, total pressure 2.0MPa, oxygen partial pressure about 0.5MPa, in the reaction solution, the concentration of NaOH...
Embodiment 2
[0025] Add dilute sulfuric acid solution to corn stalks at a solid-to-liquid ratio of 1:9, with a sulfuric acid concentration of 0.8%, and cook for 100 min at 125°C. After the reaction, centrifuge to separate the solid from the liquid. The liquid is used to produce sugar alcohol products. After the solid is washed with hot water, the acid hydrolysis residue is obtained, in which the cellulose content is 65.42%, the hemicellulose content: 8.14%, and the lignin content: 20.64%, ash content: 4.62%, other components 1.18%.
[0026] The acid hydrolysis residue is further subjected to the separation of cellulose components. The reaction was carried out in a stainless steel reactor. The reaction conditions of lignin wet oxidation are: 160°C, total pressure 2.0MPa, oxygen partial pressure about 0.8MPa, in the reaction solution, the concentration of NaOH is 1.0mol / L, and the initial concentration of lignin is 100g / L (according to dry basis lignin meter), catalyst LaFeO 3 The dosage ...
Embodiment 3
[0029] Add dilute sulfuric acid solution to the bagasse at a solid-to-liquid ratio of 1:10, with a sulfuric acid concentration of 2.0%, and cook for 180 min at 105°C. After the reaction, centrifuge to separate the solid from the liquid. The liquid is used to produce sugar alcohol products. After the solid is washed with hot water, an acid hydrolysis residue is obtained, in which the cellulose content is 58.96%, the hemicellulose content: 6.47%, and the lignin content: 23.12%, ash content: 2.28%, other components 9.17%.
[0030] The acid hydrolysis residue is further subjected to the separation of cellulose components. The reaction was carried out in a stainless steel reactor. The reaction conditions of lignin wet oxidation are: 180°C, total pressure 2.0MPa, oxygen partial pressure about 1.0MPa, in the reaction solution, the concentration of NaOH is 1.5mol / L, and the initial concentration of lignin is 200g / L (according to dry basis lignin meter), catalyst LaFeO 3 The dosage ...
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