Method for preparation of lignosulfonate and cogeneration of microcrystalline cellulose from corn cob residues
A technology of lignosulfonate and microcrystalline cellulose, which is applied in cellulose raw material pulping, cellulose pulp post-processing, fiber raw material processing and other directions, can solve the problems of low purity and complex preparation process of lignosulfonate. , to achieve the effect of simple production process, low resource utilization, and changing the scope of application
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Embodiment 1
[0037] (1) Desanding: Xylose residues are desanded through cleaning separator, high-concentration desander, separation desander, dredging desander, and then dehydrated to about 50% by filter press dehydrator and screw squeezer. It is then crushed by a crusher for use.
[0038] (2) Sulfonation: Put the crushed xylose residue obtained in step (1) into a steaming ball, add sulfonating agent and a small amount of cooking aid anthraquinone, add water to adjust the solid-liquid ratio to 1:4, and the sulfonation temperature 130°C, time 240min. The sulfonating agent is a mixture of sodium hydroxide and sodium sulfite with a mass ratio of 13:7, the dosage of the sulfonating agent is 15% of the mass of the absolute dry xylose residue, and the amount of the cooking aid is 0.3% (mass ratio, for absolute dry xylose residue ), sulfonation degree>1.2mmol / g (determination of sulfonation degree of finished lignosulfonate by ion exchange-conductometric titration method).
[0039] (3) Solid-li...
Embodiment 2
[0046] (1) Desanding: Xylose residues are desanded by cleaning separator, high concentration desander, separation desander, desandering desander, and then dehydrated to about 50% by filter press dehydrator and screw squeezer. It is then crushed by a crusher for use.
[0047] (2) Sulfonation: Put the crushed xylose residue obtained in step (1) into a steaming ball, add sulfonation agent and a small amount of cooking aid green oxygen, add water to adjust the solid-liquid ratio to 1: 10, and the sulfonation temperature 165°C, time 60min. The sulfonating agent is a mixture of potassium hydroxide and sodium bisulfite, the mass ratio is 1:0.3, the amount of sulfonating agent is 20% of the mass of dry xylose residue, and the amount of cooking aid is 1% (mass ratio, vs. Dry xylose residue), sulfonation degree > 1.2mmol / g (determination of sulfonation degree of finished lignosulfonate by ion exchange-conductometric titration method).
[0048] (3) Solid-liquid separation and washing:...
Embodiment 3
[0055] (1) Desanding: The xylose residue is desanded through the cleaning separator, high-concentration desander, separation desander, and dredging desander, and then dehydrated to about 70% by the filter press dehydrator and the screw squeezer. It is then crushed by a crusher for use.
[0056] (2) Sulfonation: put the desanded xylose residue obtained in step (1) into a steaming ball, add sulfonating agent and a small amount of cooking aid tetrahydroanthraquinone, add water to adjust the solid-to-liquid ratio to 1:8, The sulfonation temperature is 140°C, and the time is 60-240min. The sulfonating agent is a mixture of calcium hydroxide and calcium sulfite with a mass ratio of 1:0.8, the amount of sulfonating agent is 20% of the mass of dry xylose residue, and the amount of cooking aid is 0.8% (mass ratio, for dry wood sugar residue), the sulfonation degree>1.2mmol / g (the sulfonation degree of the finished lignosulfonate was determined by ion exchange-conductometric titration ...
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