Comprehensive utilization process of wood cellulose

[0048] Embodiment 1: comprehensive utilization of plant lignocellulose to produce xylooligosaccharides, lignin and cellulosic ethanol, the steps are as follows:

[0049] (1) Preparation of xylooligosaccharides

[0050] (1) Steam explosion: crush the biomass raw material (corn cob) to 20 mesh; the blasting conditions are: blasting pressure 2.0Mpa, blasting time 60s;

[0051] (2) Slurry mixing: batching according to the solid-liquid ratio of 1:6, adjust the pH to 3.5, stir evenly, and prepare for enzymolysis;

[0052] (3) Enzymolysis: Add 20 IU / g of xylanase to the material that has been prepared for pulping, and carry out enzymolysis to obtain crude sugar liquid. The enzymolysis temperature is 50° C., and the enzymolysis time is 8 hours; the xylo-oligosaccharide content is 82%;

[0053] (4) Slag-liquid separation: Slag-liquid separation is carried out after enzymolysis to obtain sugar liquid and sugar residue. The sugar liquid is used to prepare xylooligosaccharides, and the s...

[0077] Embodiment 2: comprehensive utilization of plant lignocellulose to produce xylooligosaccharides, lignin and cellulosic ethanol, the steps are as follows:

[0078] (1) Preparation of xylooligosaccharides

[0079] (1) Steam explosion: crush the biomass raw material (straw) to 20 mesh; the blasting conditions are: the blasting pressure is 2.5Mpa, and the blasting time is 90s;

[0080] (2) Slurry mixing: batching according to the solid-liquid ratio of 1:7, adjust the pH to 3.8, stir evenly, and prepare for enzymolysis;

[0081] (3) Enzymolysis: Add 20IU / g xylanase to the material that has been prepared for pulping, and carry out enzymolysis to obtain crude sugar liquid; enzymolysis temperature is 50°C; enzymolysis time is 12 hours; after enzymolysis, the xylooligosaccharide content 87%;

[0082] (4) Slag-liquid separation: Slag-liquid separation is carried out after enzymolysis to obtain sugar liquid and sugar residue. The sugar liquid is used to prepare xylooligosacchari...

[0106] Embodiment 3: comprehensive utilization of plant lignocellulose to produce xylooligosaccharides, lignin and cellulosic ethanol, the steps are as follows:

[0107] (1) Preparation of xylooligosaccharides:

[0108] (1) Steam explosion: crush the biomass raw material (straw) to 20 mesh, and carry out steam explosion, the blasting conditions are: blasting pressure 2.0Mpa, blasting time is 60s;

[0109] (2) Slurry mixing: batching according to the solid-liquid ratio of 1:6, adjust the pH to 3.5, stir evenly, and prepare for enzymolysis;

[0110] (3) Enzymolysis: Add 11IU / g xylanase to the material that has been prepared for pulping, and carry out enzymolysis to obtain crude sugar liquid; enzymolysis temperature is 50°C; enzymolysis time is 8 hours; after enzymolysis, the xylooligosaccharide content 89%;

[0111] (4) Slag-liquid separation: Slag-liquid separation is carried out after enzymolysis to obtain sugar liquid and sugar residue. The sugar liquid is used to prepare x...