Oxygen delignification process for bamboo wood dissolving pulp
A technology of oxygen delignification and dissolving pulp, which is applied in the field of dissolving pulp preparation, can solve the problems of backward production equipment and technology of bamboo dissolving pulp, high consumption of bleaching chemicals, and poor protection of cellulose, so as to save bleaching costs, The effect of high flexibility and stable card price
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Embodiment 1
[0020] An oxygen delignification process for bamboo dissolving pulp, which adopts two-stage oxygen delignification, specifically includes the following process steps:
[0021] A. Add caustic soda accounting for 2.0% of the air-dried pulp weight and 1kg / admt magnesium sulfate to the slurry with a weight concentration of 8% after washing and concentrating in the pulp washer, heat it to 90°C with low-pressure steam, and then send it in by a medium-concentration pump The first medium-concentration mixer, add 20kg / admt oxygen (the pressure of oxygen is 1.0Mpa, the purity of oxygen ≥ 93%) into the first medium-concentration mixer, mix evenly and enter the ascending / downflowing reaction tube, slurry The residence time of the material in the up / down flow reaction tube is 5min;
[0022] B. The slurry coming out of the downflow tower in the first stage is heated to 95°C by medium-pressure steam, and sent to the medium-concentration mixer in the second stage through the medium-concentrat...
Embodiment 2
[0026] An oxygen delignification process for bamboo dissolving pulp, which adopts two-stage oxygen delignification, specifically includes the following process steps:
[0027] A. Add 2.5% caustic soda and 1.5kg / admt magnesium sulfate to the pulp with a weight concentration of 10% after washing and concentration in the pulp washer, heat it to 92°C with low-pressure steam, and then pump it with medium concentration Into the first medium-concentration mixer, add 22kg / admt oxygen (the pressure of oxygen is 1.1Mpa, the purity of oxygen is ≥ 93%) into the first medium-concentration mixer, mix well and then enter the ascending / downflowing reaction tube, The residence time of the slurry in the up / down flow reaction tube is 7min;
[0028] B. The slurry coming out of the first downflow tower is heated to 98°C by medium-pressure steam, then sent to the second-stage medium-concentration mixer through a medium-concentration pump, and 22kg / admt oxygen is added to the second-stage medium-con...
Embodiment 3
[0032] An oxygen delignification process for bamboo dissolving pulp, which adopts two-stage oxygen delignification, specifically includes the following process steps:
[0033] A. Add caustic soda accounting for 2.8% of air-dried pulp weight and 2.5kg / admt magnesium sulfate to the slurry with a weight concentration of 11% after washing and concentrating in the pulp washer, heat it to 93°C with low-pressure steam, and then pump it by medium-concentration Into the first medium-concentration mixer, add 24kg / admt oxygen (the pressure of oxygen is 1.1Mpa, and the purity of oxygen is ≥ 93%) into the first medium-concentration mixer, mix well and then enter the ascending / falling flow reaction tube, The residence time of the slurry in the up / down flow reaction tube is 8min;
[0034] B. The slurry from the first downflow tower is heated to 100°C by medium-pressure steam, then sent to the second-stage medium-concentration mixer through a medium-concentration pump, and 24kg / admt oxygen is...
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