Production methods for solubilized lignin, saccharide raw material and monosaccharide raw material, and solubilized lignin

A production method of a saccharide raw material, comprising:

• a first step of mixing 100 parts by mass (on a dry basis) of a powder obtained by pulverizing a lignocellulosic raw material with aqueous hydrogen peroxide in an amount of 20 to 400 parts by mass in terms of hydrogen peroxide and heating the mixture for 5 to 120 minutes at a pressure of 0.1 to 1.5 MPa and a temperature of 80 to 200° C. while irradiating the mixture with microwaves;
• a fifth step of separating insoluble matter obtained in the first step to obtain a liquid portion;
• and
• a sixth step of removing hydrogen peroxide in the liquid portion obtained in the fifth step.

A production method of a monosaccharide raw material, comprising:

• a first step of mixing 100 parts by mass (on a dry basis) of a powder obtained by pulverizing a lignocellulosic raw material with aqueous hydrogen peroxide in an amount of 20 to 400 parts by mass in terms of hydrogen peroxide and heating the mixture for 5 to 120 minutes at a pressure of 0.1 to 1.5 MPa and a temperature of 80 to 200° C. while irradiating the mixture with microwaves;
• a second step of separating insoluble matter obtained in the first step from the aqueous hydrogen peroxide;
• a seventh step of extracting the insoluble matter obtained in the second step with a solvent to produce an extraction residue;
• and
• an eighth step of adding hydrogen peroxide to the extraction residue obtained in the seventh step followed by reirradiation with microwaves, or adding a strong acid to the extraction residue followed by heating, to obtain soluble matter.