A kind of poplar wood ultrasonic chemical mechanical method pulping process
An ultrasonic and pulping technology, applied in multi-stage pulping process, pulping with inorganic alkali, pulping with organic compounds, etc., can solve the problem of reducing the physical strength of poplar high-yield pulp and the quality of paper products, and limiting the high-yield poplar pulp Production and application range, high lignin content, etc., to improve physical and optical properties, reduce environmental pollution and production cost pressure, and increase penetration capacity
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Embodiment 1
[0032] Three-year-old poplar wood chips are pulped according to the following steps after steaming the first stage of extrusion and decompression:
[0033](1) Ultrasonic pretreatment, the ultrasonic treatment instrument is JY-98ⅢN, the pretreatment conditions are: slurry concentration 3%, temperature 40-60°C, time 10min, ultrasonic power 120W;
[0034] (2) Xylanase pretreatment, the enzyme used is solid xylanase ZX-SP002, the pretreatment conditions are: temperature 40-60°C, time 30min, pH value 5-6, enzyme dosage 10IU / g dry pulp , pulp concentration 10%;
[0035] (3) Carry out the first stage of chemical pre-impregnation with the slurry treated in the above step (2) with sodium-alkali hydrogen peroxide solution. With respect to the quality of the dry pulp, the amount and process conditions of each chemical component in the impregnation solution are: NaOH 2.0%, H 2 o 2 2.5%, MgSO 4 0.15%, EDTA 0.15%, impregnation temperature 50-60℃, solid-liquid ratio 1:4;
[0036] (4) ...
Embodiment 2
[0044] Three-year-old poplar wood chips are pulped according to the following steps after steaming the first stage of extrusion and decompression:
[0045] (1) Ultrasonic pretreatment, the ultrasonic treatment instrument is JY-98ⅢN, the pretreatment conditions are: slurry concentration 3%, temperature 40-60°C, time 20min, ultrasonic power 120W;
[0046] (2) Xylanase pretreatment, the enzyme used is solid xylanase ZX-SP002, the pretreatment conditions are: temperature 40-60°C, time 30min, pH value 5-6, enzyme dosage 20IU / g dry pulp , pulp concentration 10%;
[0047] (3) Carry out the first stage of chemical pre-impregnation with the slurry treated in the above step (2) with sodium-alkali hydrogen peroxide solution. With respect to the quality of the dry pulp, the amount and process conditions of each chemical component in the impregnation solution are: NaOH 2.5%, H 2 o 2 2.9%, MgSO 4 0.15%, EDTA 0.15%, impregnation temperature 50-60℃, solid-liquid ratio 1:4;
[0048] (4)...
Embodiment 3
[0056] Three-year-old poplar wood chips are pulped according to the following steps after steaming the first stage of extrusion and decompression:
[0057] (1) Ultrasonic pretreatment, the ultrasonic treatment instrument is JY-98ⅢN, the pretreatment conditions are: slurry concentration 3%, temperature 40-60°C, time 30min, ultrasonic power 120W;
[0058] (2) Xylanase pretreatment, the enzyme used is solid xylanase ZX-SP002, the pretreatment conditions are: temperature 40-60°C, time 30min, pH value 5-6, enzyme dosage 30IU / g dry pulp , pulp concentration 10%;
[0059] (3) Carry out the first stage of chemical pre-impregnation with the slurry treated in the above step (2) with sodium-alkali hydrogen peroxide solution. With respect to the quality of the dry pulp, the amount and process conditions of each chemical component in the impregnation solution are: NaOH 2.8%, H 2 o 2 2.8%, MgSO 4 0.15%, EDTA 0.15%, impregnation temperature 50-60℃, solid-liquid ratio 1:4;
[0060] (4)...
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