A kind of method utilizing lignocellulosic enzyme hydrolysis residue to prepare lignosulfonate
A technology of lignosulfonate and lignocellulose, which is applied in the field of preparation of lignosulfonate, can solve problems such as waste, and achieve the effects of improving utilization rate, significant economic and social benefits, and easy operation
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Embodiment 1
[0023] Add 1.5 kg of corncobs to 9 kg of dilute sulfuric acid solution with a sulfuric acid concentration of 1.2%, and cook for 120 min at 118°C. After the reaction is completed, a bag centrifuge is used for solid-liquid separation to obtain acid hydrolysis residue. Acid hydrolysis residue is added in the reactor with agitation, add water and adjust dry matter concentration to 16%, adjust pH to 4.8, temperature 50 ℃, add cellulase (20FPIU / gram cellulose) and xylanase (15FPIU / gram cellulose ), the stirring speed was 200r / min, and after enzymatic hydrolysis for 48h, a bag centrifuge was used for solid-liquid separation, the filtrate was set aside, and the filter residue was the residue of enzymatic hydrolysis, which was used to prepare lignosulfonate. When cooking, the substrate concentration is 20%, the mass ratio of sodium bisulfite to enzyme hydrolysis residue is 10%, the reaction temperature is 160° C., and the reaction time is 5 hours. After the reaction, the degree of sul...
Embodiment 2
[0025] Add 1.5 kg of corn stalks to 15 kg of dilute sulfuric acid solution, the concentration of sulfuric acid is 0.8%, and cook at 125°C for 90 minutes. After the reaction, the bag centrifuge is used for solid-liquid separation to obtain acid hydrolysis residue. The acid hydrolysis residue is put into a stirred reactor, add water to adjust the dry matter concentration to 18%, adjust the pH to 5.1, and add cellulase (15FPIU / gram cellulose) and xylanase (20FPIU / gram cellulose) to 5.1 ), the stirring speed was 150r / min, and after 36 hours of enzymatic hydrolysis, a bag centrifuge was used for solid-liquid separation, the filtrate was set aside, and the filter residue, that is, the residue of enzymatic hydrolysis, was used to prepare lignosulfonate. When cooking, the substrate concentration is 10%, the mass ratio of sodium bisulfite to enzyme hydrolysis residue is 20%, the reaction temperature is 140° C., and the reaction time is 2 hours. After the reaction, the degree of sulfon...
Embodiment 3
[0027] Add 1.5 kg of wheat straw into 10.5 kg of dilute sulfuric acid solution, the sulfuric acid concentration is 2.0%, and cook for 150 min at 105°C. After the reaction, the bag centrifuge is used for solid-liquid separation to obtain acid hydrolysis residue. Acid hydrolysis residue is put into the reactor with stirring, add water to adjust dry matter concentration to 15%, adjust pH to 4.6, temperature 48 ℃, add cellulase (10FPIU / gram cellulose) and xylanase (30FPIU / gram cellulose ), the stirring speed was 50r / min, and after enzymatic hydrolysis for 72 hours, a bag centrifuge was used for solid-liquid separation, the filtrate was set aside, and the filter residue, that is, the residue of enzymatic hydrolysis, was used to prepare lignosulfonate. When cooking, the substrate concentration is 5%, the mass ratio of sodium bisulfite to enzyme hydrolysis residue is 15%, the reaction temperature is 150° C., and the reaction time is 3 hours. After the reaction, the degree of sulfona...
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