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US 8,895,275 B2Granted
Conversion of cellulosic materials into glucose for use in bioethanol production
AssigneeUniversiti Malaya
InventorsZainudin Bin Arifin, Teow Chong Teoh
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Abstract
A method for producing an aqueous sugar solution from cellulosic materials comprising the steps of heating ground cellulosic materials with perchloric acid; neutralizing the heated materials with an alkali to yield a salt precipitate; and filtering the salt precipitate off to obtain the aqueous sugar solution.
Claims6
A method for producing an aqueous sugar solution from cellulosic materials, comprising:
- mixing ground cellulosic materials with a superacid to form a mixture, wherein the superacid is free of periodic acid, wherein the superacid is partially concentrated perchloric acid, wherein the perchloric acid is present in a concentration of 60% to 72%;
- heating the mixture for not more than 5 minutes, wherein the heating is conducted at a temperature range of 60° C. to 70° C.;
- chilling the heated mixture in ice to produce a chilled mixture;
- neutralizing the chilled mixture with an alkali to yield a salt precipitate wherein the alkali is selected from the group consisting of potassium hydroxide, rubidium hydroxide, caesium hydroxide, calcium hydroxide, calcium oxide, and combinations thereof;
- filtering the salt precipitate off to obtain the aqueous sugar solution;
- and
- treating the salt precipitate with sulfuric acid to yield a sulfate salt and perchloric acid, wherein the sulfate salt is selected from the group consisting of potassium sulfate, rubidium sulfate, caesium sulfate, and calcium sulfate.
4 more elements
A method for synthesizing bioethanol, comprising:
- mixing ground cellulosic materials with a superacid, wherein the superacid is free of periodic acid, wherein the superacid is partially concentrated perchloric acid, wherein the perchloric acid is present in a concentration of 60% to 72%;
- heating the mixture for not more than 5 minutes, wherein the heating is conducted at a temperature range of 60° C. to 70° C.;
- chilling the heated mixture in ice to produce a chilled mixture;
- neutralizing the chilled mixture with an alkali to yield a salt precipitate wherein the alkali is selected from the group consisting of potassium hydroxide, rubidium hydroxide, caesium hydroxide, calcium hydroxide, calcium oxide, and combinations thereof;
- filtering the salt precipitate off to obtain an aqueous sugar solution;
- fermenting the aqueous sugar solution with yeast to produce bioethanol;
- distilling out the bioethanol;
- and
- treating the salt precipitate with sulfuric acid to yield a sulfate salt and perchloric acid, wherein the sulfate salt is selected from the group consisting of potassium sulfate, rubidium sulfate, caesium sulfate, and calcium sulfate.
6 more elements
Dependencies are inferred from the claim text.