阅读说明：本技术 一种玉米秸秆中纤维素的低温提取方法 (Low-temperature extraction method of cellulose in corn straw ) 是由 张循海 贾宏葛 宋贺明 于 2020-07-13 设计创作，主要内容包括：一种玉米秸秆中纤维素的低温提取方法,涉及一种玉米秸秆中纤维素的低温提取方法。目的在于提供一种玉米秸秆中纤维素的低温提取方法。提取方法：取玉米秸秆粉在NaOH溶液中0℃恒温搅拌；室温静置,取下层沉淀过滤、烘干；在装有上一步滤渣的试剂瓶中加入体积比为甲酸:乙酸:去离子水＝4:5:1的混合液120.0mL,在60℃下反应2.5h；在60℃静止,将下层沉淀过滤,65℃烘箱中烘干,得到白色纤维素粉末。本发明所得的纤维素红外表征达到预期结果,有低温提取的优势,可应用于造纸等行业。本发明适用于纤维素的提取。(A low-temperature extraction method of cellulose in corn stalks relates to a low-temperature extraction method of cellulose in corn stalks. Aims to provide a low-temperature extraction method of cellulose in corn straws. The extraction method comprises the following steps: taking corn straw powder and stirring the corn straw powder in NaOH solution at constant temperature of 0 ℃; standing at room temperature, taking the lower layer precipitate, filtering and drying; adding 120.0mL of mixed solution of formic acid, acetic acid and deionized water in a volume ratio of 4:5:1 into a reagent bottle filled with the filter residue in the last step, and reacting for 2.5h at 60 ℃; standing at 60 deg.C, filtering the lower layer precipitate, and oven drying at 65 deg.C to obtain white cellulose powder. The infrared characterization of the cellulose obtained by the invention achieves the expected result, has the advantage of low-temperature extraction, and can be applied to industries such as papermaking and the like. The invention is suitable for extracting cellulose.)

1. A low-temperature extraction method of cellulose in corn straws is characterized by comprising the following steps: the method comprises the following steps:

(1) putting 2.0g of corn straw powder into a reagent bottle, adding 64.8mL of 1.3mol/L NaOH aqueous solution, putting the mixture into a 0 ℃ thermostat, and stirring for 72 hours to obtain a mixed solution A;

(2) standing the mixed solution at room temperature, precipitating, pouring out brown supernatant, filtering the lower layer of the precipitate, repeatedly adding deionized water, washing and filtering until the filtrate is colorless and the pH value is 7.0, and drying the filter residue in a 65 ℃ drying oven to obtain a solid B;

(3) putting the dried solid B into a 250.0mL three-necked bottle, adding 120.0mL of a mixed solution of formic acid, acetic acid and deionized water in a volume ratio of 4:5:1, heating to 60 ℃, and stirring for reaction for 2.5 hours;

(4) and (3) precipitating the mixed solution obtained in the step (3) at the temperature of 60 ℃, pouring out a supernatant, filtering a lower layer precipitate until the pH value is 7.0, and drying filter residues in a 65 ℃ oven to obtain white cellulose powder.

2. A low-temperature extraction method of cellulose in corn straws is characterized by comprising the following steps: the method comprises the following steps:

(1) putting 1.9g of corn straw powder into a reagent bottle, adding 64.8mL of 1.3mol/L NaOH aqueous solution, and stirring in a 0 ℃ thermostat for 72 hours to obtain a mixed solution A;

(2) standing the mixed solution at room temperature, precipitating, pouring out brown supernatant, filtering the lower layer of the precipitate, repeatedly adding deionized water, washing and filtering until the filtrate is colorless and the pH value is 7.0, and drying the filter residue in a 65 ℃ drying oven to obtain a solid B;

(3) putting the dried solid B into a 250.0mL three-necked bottle, adding 120.0mL of a mixed solution of formic acid, acetic acid and deionized water in a volume ratio of 4:5:1, heating to 60 ℃, and stirring for reaction for 2.5 hours;

(4) and (3) precipitating the mixed solution obtained in the step (3) at the temperature of 60 ℃, pouring out a supernatant, filtering a lower layer precipitate until the pH value is 7.0, and drying filter residues in a 65 ℃ oven to obtain white cellulose powder.

Technical Field

The invention relates to a low-temperature extraction method of cellulose in corn straws.

Background

Corn is one of main crops in northeast, but the treatment of the straw is always a technical difficulty, and the existing main treatment mode is open-air incineration, which affects the ecological environment. The corn stalks contain about 30 to 40 percent of cellulose, the cellulose is a natural polymer with wide application, cotton, bamboo, arbor and the like are the main extraction objects of the cellulose at present, and the high-temperature reaction is adopted, so that the energy consumption is high, and the emission of harmful substances is more. The method has important significance in the fields of green chemistry, material science and the like by extracting the cellulose in the corn straws under the low-temperature reaction condition.

Disclosure of Invention

The invention aims to provide a low-temperature extraction method of cellulose in corn straws, which can extract the cellulose with higher purity.

The purpose of the invention is realized by the following technical scheme: a method for extracting cellulose in corn straws under low-temperature reaction conditions comprises the following steps:

(1) putting 2.0g of corn straw powder into a reagent bottle, adding 64.8mL of 1.3mol/L NaOH aqueous solution, putting the mixture into a 0 ℃ thermostat, and stirring for 72 hours to obtain a mixed solution A;

(2) standing the mixed solution at room temperature, precipitating, pouring out brown supernatant, filtering the lower layer of the precipitate, repeatedly adding deionized water, washing and filtering until the filtrate is colorless and the pH value is 7.0, and drying the filter residue in a 65 ℃ drying oven to obtain a solid B;

(3) putting the dried solid B into a 250.0mL three-necked bottle, adding 120.0mL of a mixed solution of formic acid, acetic acid and deionized water in a volume ratio of 4:5:1, heating to 60 ℃, and stirring for reaction for 2.5 hours;

(4) and (3) precipitating the mixed solution obtained in the step (3) at the temperature of 60 ℃, pouring out a supernatant, filtering a lower layer precipitate until the pH value is 7.0, and drying filter residues in a 65 ℃ oven to obtain white cellulose powder.

The invention has the beneficial effects that: extracting cellulose from the corn straws under the conditions of low temperature, low energy consumption and conventional reagents.

Detailed Description

The technical scheme of the invention is not limited to the specific embodiments listed below, and any reasonable combination of the specific embodiments is included.