阅读说明：本技术 一种生物质秸秆纤维漂白技术方法 (Technical method for bleaching biomass straw fibers ) 是由 李一鹏 贾奎增 张培勋 孙炜 张德全 于 2019-11-28 设计创作，主要内容包括：本发明公开了一种生物质秸秆纤维漂白技术方法,步骤如下：1)预处理：将生物质秸秆用清水冲洗干净,烘干处理,再粉碎成粉末,将所得原料粉末与水混合后,室温下搅拌均匀,搅拌下逐渐升温至180-260℃预处理60-100min,后冷却至室温,过滤,得到混合物A；2)向混合物A内加入稀酸,进行酸预处理,得到混合物B；3)向混合物B内依次加入螯合剂、缓冲剂和活化剂,得到混合物C；4)在混合物C内加入少量烧碱,调节PH至8-10.5之间,得到混合物D；5)将过氧化氢加入到混合物D内进行漂白,得到混合物E,即为漂白后的生物质秸秆纤维,是一种白度高、损耗低、漂白时间短、方法简单、成本低廉的处理方法。(The invention discloses a technical method for bleaching biomass straw fibers, which comprises the following steps: 1) pretreatment: washing biomass straws with clear water, drying, crushing into powder, mixing the obtained raw material powder with water, uniformly stirring at room temperature, gradually heating to 180-260 ℃ for pretreatment for 60-100min under stirring, cooling to room temperature, and filtering to obtain a mixture A; 2) adding dilute acid into the mixture A, and performing acid pretreatment to obtain a mixture B; 3) adding a chelating agent, a buffering agent and an activating agent into the mixture B in sequence to obtain a mixture C; 4) adding a small amount of caustic soda into the mixture C, and adjusting the pH value to 8-10.5 to obtain a mixture D; 5) adding hydrogen peroxide into the mixture D for bleaching to obtain a mixture E, namely the bleached biomass straw fiber, and the method is a treatment method with high whiteness, low loss, short bleaching time, simple method and low cost.)

1. A technical method for bleaching biomass straw fibers is characterized by comprising the following steps:

1) pretreatment: washing biomass straws with clear water, drying, crushing into powder, mixing the obtained raw material powder with water, uniformly stirring at room temperature, gradually heating to 180-260 ℃ for pretreatment for 60-100min under stirring, cooling to room temperature, and filtering to obtain a mixture A;

2) adding dilute acid into the mixture A, and performing acid pretreatment to obtain a mixture B;

3) adding a chelating agent, a buffering agent and an activating agent into the mixture B in sequence to obtain a mixture C;

4) adding a small amount of caustic soda into the mixture C, and adjusting the pH value to 8-10.5 to obtain a mixture D;

5) and adding hydrogen peroxide into the mixture D for bleaching to obtain a mixture E, namely the bleached biomass straw fiber.

2. The technical method for bleaching biomass straw fibers according to claim 1, wherein in the step 1), the straws are crushed by a ball mill and then pass through a 60-mesh sieve, and the sieved powder is taken out.

3. The technical method for bleaching biomass straw fiber according to claim 1, wherein in the step 2), the dilute acid comprises one or more of hydrochloric acid, oxalic acid, formic acid and acetic acid.

4. The technical method for bleaching biomass straw fibers according to claim 1, wherein in the step 3), the chelating agent is ethylenediamine succinic acid or imine succinic acid.

5. The technical method for bleaching biomass straw fiber according to claim 1, wherein in the step 3), the stabilizer is one or a combination of sodium silicate, sodium citrate and zeolite.

6. The technical method for bleaching biomass straw fiber according to claim 1, wherein in the step 3), the activating agent is urea.

7. The technical method for bleaching biomass straw fibers according to claim 1, wherein in the step 5), the bleaching temperature is controlled to be 60-90 ℃ and the bleaching time is 30-60 min.

Technical Field

The invention relates to the technical field of biomass fiber bleaching, in particular to a technical method for bleaching biomass straw fibers.

Background

Cellulose is a macromolecular polysaccharide composed of glucose, is insoluble in water and common organic solvents, and is the main component of plant cell walls. Cellulose is a polysaccharide which is widely distributed and has the largest content in nature, and accounts for more than 50% of the carbon content in the plant world, paper is an essential article in life, and the main raw materials for papermaking are biomass fibers, such as: wood pulp, wheat straw pulp, etc. are darker due to their high lignin content and must be bleached prior to use.

In the traditional bleaching process, the bleached wastewater contains a large amount of chlorine-containing organic pollutants such as kaempe and furan, the traditional treatment method is long in time and high in energy consumption, and the bleached soybean protein fiber fabric is dark in color and has certain pollution to the natural environment.

Disclosure of Invention

The invention aims to provide a technical method for bleaching biomass straw fibers, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a technical method for bleaching biomass straw fibers comprises the following steps:

1) pretreatment: washing biomass straws with clear water, drying, crushing into powder, mixing the obtained raw material powder with water, uniformly stirring at room temperature, gradually heating to 180-260 ℃ for pretreatment for 60-100min under stirring, cooling to room temperature, and filtering to obtain a mixture A;

2) adding dilute acid into the mixture A, and performing acid pretreatment to obtain a mixture B;

3) adding a chelating agent, a buffering agent and an activating agent into the mixture B in sequence to obtain a mixture C;

4) adding a small amount of caustic soda into the mixture C, and adjusting the pH value to 8-10.5 to obtain a mixture D;

5) adding hydrogen peroxide into the mixture D for bleaching to obtain a mixture E, namely bleached biomass straw fibers;

as a further scheme of the invention: in the step 1), the straws are crushed by a ball mill and then sieved by a 60-mesh sieve, and the sieved powder is taken out.

As a further scheme of the invention: in the step 2), the dilute acid comprises one or a combination of hydrochloric acid, oxalic acid, formic acid and acetic acid.

As a further scheme of the invention: in the step 3), the chelating agent is ethylenediamine succinic acid or imine succinic acid.

As a further scheme of the invention: in the step 3), the stabilizer is one or a combination of several of sodium silicate, sodium citrate and zeolite.

As a further scheme of the invention: in the step 3), the activating agent is urea.

As a further scheme of the invention: in the step 5), the temperature is controlled to be 60-90 ℃ during bleaching, and the bleaching time is 30-60 min.

Compared with the prior art, the invention has the beneficial effects that:

the method fills the blank of the prior art, effectively avoids the ineffective decomposition of the hydrogen peroxide by acid pretreatment and adding a chelating agent, a buffering agent and an activating agent, and is a treatment method with high whiteness, low loss, short bleaching time, simple method and low cost.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to specific embodiments.