Method for producing microcrystalline cellulose from tobacco and related tobacco product
Methods for producing dissolving grade pulp and microcrystalline cellulose from tobacco are provided. The methods include chemical pulping a tobacco input to form a tobacco pulp. Chemical pulping the tobacco input includes combining the tobacco input with a strong base defining a weight from about 5% to about 50% of the tobacco input, and heating the tobacco input and the strong base with an H-factor from about 500 to about 3,300. Further, the methods include bleaching the tobacco pulp to produce a dissolving grade pulp. Bleaching the tobacco pulp may include chlorination of the tobacco pulp with a chlorine dioxide solution, and caustic extraction of the tobacco pulp with a second strong base. A related tobacco-derived microcrystalline cellulose product is also provided, which can be used as a binder, a filler, and/or a texturizer in a tobacco product, such as a smokeless tobacco product.
1. A dissolving grade pulp derived from tobacco, the dissolving grade pulp characterized by a brightness of at least about 83%, an alpha-cellulose concentration of at least about 88% by weight, a beta and a gamma cellulose content, and a degree of polymerization of about 100 to about 750, wherein the dissolving grade pulp is characterized by a kappa number between about 20 and about 30.
2. The dissolving grade pulp of claim 1 , wherein the dissolving grade pulp is formed by subjecting a tobacco input to the following operations:
chemical pulping the tobacco input to form a tobacco pulp; and
bleaching the tobacco pulp.
3. The dissolving grade pulp of claim 2 , wherein chemical pulping the tobacco input comprises:
combining the tobacco input with a strong base; and
heating the tobacco input and the strong base.
4. The dissolving grade pulp of claim 2 , wherein bleaching the tobacco pulp comprises:
chlorination of the tobacco pulp with a chlorine dioxide solution; and
caustic extraction of the tobacco pulp with a second strong base.
5. The dissolving grade pulp of claim 1 , wherein the dissolving grade pulp is characterized by a quantity of hemicelluloses of about 0.5% to about 10% by weight of the dissolving grade pulp.
6. The dissolving grade pulp of claim 1 , wherein the dissolving grade pulp is characterized by a quantity of lignin of about 0% to about 0.2% by weight of the dissolving grade pulp.
7. The dissolving grade pulp of claim 1 , wherein the dissolving grade pulp is characterized by a quantity of pentosan of about 0% to about 5% by weight of the dissolving grade pulp.
8. The dissolving grade pulp of claim 1 , wherein the dissolving grade pulp is characterized by a quantity of ash of about 0% to about 0.15% by weight of the dissolving grade pulp.
9. The dissolving grade pulp of claim 1 , wherein the dissolving grade pulp is characterized by a quantity of alcohol-benzene extractives of about 0% to about 0.5% by weight of the dissolving grade pulp.
10. The dissolving grade pulp of claim 1 , wherein the dissolving grade pulp is characterized by a viscosity of about 2 centipoise to about 15 centipoise, the viscosity being measured by a capillary viscometer in a 0.5 wt-% cupriethylenediamine solution.
11. The dissolving grade pulp of claim 1 , wherein the dissolving grade pulp is characterized by a copper number of about 0.1 to about 1.2.
12. The dissolving grade pulp of claim 1 , wherein the dissolving grade pulp is characterized by between about 5% and about 15% of the dissolving grade pulp having a particle size of less than about 10 μm, the particles of the dissolving grade pulp being sized to pass through a screen mesh.