阅读说明：本技术 采用碱性电解水实现废弃生物质再生利用的方法 (Method for realizing regeneration and utilization of waste biomass by adopting alkaline electrolyzed water ) 是由 姜玉莹 陈珂 薛颖欣 肖伟 杨阳 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种采用碱性电解水实现废弃生物质再生利用的方法,包括：将废弃生物质和碱性电解水A加入到高压反应器中,向反应器内注入高压二氧化碳,在一定温度和压力下保持,泄压,然后加入离子液体和碱性电解水B,再次向反应器内注入高压二氧化碳,在一定温度和压力下保持,超临界二氧化碳处理结束后打开阀门泄压,泄压后将反应物料进行固液分离,液体回收,固体烘干,得到产物；其中,以碳酸钾或碳酸钠作为电解质经电解得到碱性原液,将碱性原液稀释10～20倍得到碱性电解水A；将碱性原液稀释40～50倍得到碱性电解水B。采用碱性电解水和超临界二氧化碳对生物质进行预处理,可有效对生物质的结构进行破坏,为后续水解反应提供便利条件。(The invention discloses a method for realizing regeneration and utilization of waste biomass by adopting alkaline electrolyzed water, which comprises the following steps: adding waste biomass and alkaline electrolyzed water A into a high-pressure reactor, injecting high-pressure carbon dioxide into the reactor, keeping at a certain temperature and pressure, releasing pressure, then adding ionic liquid and alkaline electrolyzed water B, injecting high-pressure carbon dioxide into the reactor again, keeping at a certain temperature and pressure, opening a valve to release pressure after the supercritical carbon dioxide treatment is finished, performing solid-liquid separation on the reaction material after the pressure is released, recovering the liquid, and drying the solid to obtain a product; wherein potassium carbonate or sodium carbonate is used as electrolyte to obtain alkaline stock solution through electrolysis, and the alkaline stock solution is diluted by 10-20 times to obtain alkaline electrolyzed water A; and diluting the alkaline stock solution by 40-50 times to obtain alkaline electrolyzed water B. Alkaline electrolyzed water and supercritical carbon dioxide are adopted to pretreat biomass, so that the structure of the biomass can be effectively destroyed, and convenience is provided for subsequent hydrolysis reaction.)

1. A method for realizing the recycling of waste biomass by adopting alkaline electrolyzed water is characterized by comprising the following steps:

adding waste biomass and alkaline electrolyzed water A into a high-pressure reactor, injecting high-pressure carbon dioxide into the reactor, keeping the temperature at 60-80 ℃ and the pressure at 12-25 MPa for 30-90 min, decompressing, then adding ionic liquid and alkaline electrolyzed water B, injecting the high-pressure carbon dioxide into the reactor again, keeping the temperature at 85-125 ℃ and the pressure at 10-20 MPa for 60-90 min, opening a valve to decompress after the supercritical carbon dioxide treatment is finished, performing solid-liquid separation on reaction materials after decompression, recovering liquid, and drying solid to obtain a product;

wherein potassium carbonate or sodium carbonate is used as electrolyte to obtain alkaline stock solution through electrolysis, and the alkaline stock solution is diluted by 10-20 times to obtain alkaline electrolyzed water A; diluting the alkaline stock solution by 40-50 times to obtain alkaline electrolyzed water B;

the oxidation-reduction potential ORP of the alkaline stock solution is-800 mv to-1300 mv; the pH value of the alkaline stock solution is 12.00-13.50.

2. The method for realizing the recycling of the waste biomass by adopting the alkaline electrolyzed water as the claim 1 is characterized in that in the process of obtaining the alkaline stock solution by taking potassium carbonate as the electrolyte through electrolysis: the mass concentration of the adopted potassium carbonate solution is 10-25%, and the conductivity is 12000-50000 mS/m; the mass concentration of the adopted sodium carbonate solution is 25-45%, and the conductivity is 5000-10000 mS/m; the current of the electrolysis is 8-12A.

3. The method for recycling waste biomass by using alkaline electrolyzed water as claimed in claim 1, wherein the weight ratio of the waste biomass to the alkaline electrolyzed water A is 1: 12-25; the weight ratio of the waste biomass to the ionic liquid is 1: 5-8; the weight ratio of the waste biomass to the alkaline electrolyzed water B is 1:8 to 10.

4. The method for recycling waste biomass according to claim 1, wherein the ionic liquid is any one of 1-ethyl-3-methylimidazolium acetate, 1-allyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium chloride, and 1-ethyl-3-methylimidazolium chloride.

5. The method for realizing the recycling of waste biomass by using alkaline electrolyzed water as claimed in claim 1, wherein before the solid-liquid separation, the reaction materials are added into a vacuum packaging bag for vacuum packaging, and the vacuum degree is controlled to be 0.1 MPa; and (3) putting the vacuum packaging bag into high static pressure treatment equipment, sealing the pressurizing cavity, and pressurizing to perform high static pressure treatment.

6. The method for realizing the recycling of the waste biomass by using the alkaline electrolyzed water as claimed in claim 5, wherein the parameters of the high static pressure treatment are as follows: raising the pressure to 400-650 MPa at a pressure raising speed of 8-10 MPa/s, and carrying out pressure maintaining treatment for 15-25 min at normal temperature.

7. The method for recycling waste biomass through alkaline electrolyzed water as claimed in claim 5, further comprising adding a hydrogen peroxide solution into the reaction materials, stirring and mixing the mixture, and then adding the mixture into a vacuum packaging bag for vacuum packaging.

8. The method for realizing the recycling of the waste biomass by adopting the alkaline electrolyzed water as claimed in claim 7, wherein the mass fraction of the hydrogen peroxide solution is 20-35%; the mass ratio of the reaction materials to the hydrogen peroxide solution is 1: 2-3.

9. The method for recycling waste biomass through alkaline electrolyzed water as claimed in claim 1, wherein the waste biomass is any one of straw, processing residues of forest products and landscaping garbage.

10. The method for realizing the recycling of waste biomass by using alkaline electrolyzed water as claimed in claim 1, wherein the straw is any one of rice straw, corn straw, wheat straw, sorghum straw and bamboo straw.

Technical Field

The invention relates to the technical field of waste biomass recycling, in particular to a method for realizing waste biomass recycling by adopting alkaline electrolyzed water.

Background

The waste biomass is considered as a high-value biological material, can be regenerated, is low in price, can be used as a substrate to extract high value-added products, and can effectively avoid solid waste pollution caused by the waste biomass due to comprehensive utilization. For example, most biomass wastes slowly release harmful methane greenhouse gases, and their incineration disposal also produces many atmospheric pollutants. Thus, improper disposal of biomass waste can adversely affect the climate, water, soil, and air environment. The method is a high-efficiency biomass resource utilization technology for preparing reducing sugar by hydrolyzing waste biomass and then fermenting to produce fuel ethanol. However, since the carbohydrates in the biomass are mostly in the form of polymers, the direct hydrolysis conditions are harsh and inefficient. If the biomass is pretreated appropriately and then subjected to hydrolysis reaction, the hydrolysis conditions are expected to be improved and the efficiency is expected to be improved.

At present, the pretreatment methods for biomass mainly comprise acid-base pretreatment, steam explosion pretreatment and ammonia fiber explosion pretreatment. The acid-base pretreatment process is mature, but has corrosion problem to equipment, neutralization treatment is needed after pretreatment, the steps are complex, and the waste liquid pollutes the environment. Steam explosion and ammonia fiber explosion pretreatment have the advantages of high treatment speed and the like, but the conditions are harsh and a high-pressure container is required. The steam explosion energy consumption is large, and the temperature is high; the ammonia gas in the ammonia fiber explosion is toxic and pollutes the environment, and the equipment investment is increased by recycling. In recent years, a novel pretreatment method which is environmentally friendly and has mild conditions has been developed and is highly preferred.

When the electrolyte dilute solution is electrolyzed by using a special electrolysis device under the conditions of certain voltage and current, products with special physicochemical properties are generated on the electrodes at the two sides, namely the electrolyzed water. The active components of the water are unstable, and the water can form nontoxic and residue-free common water after use, has no pollution after discharge, and does not cause harm to human and ecological environment. At present, alkaline electrolyzed water is widely applied to the fields of vegetable sterilization, plant cultivation, medical instrument disinfection and the like, and a literature report of treating waste biomass by adopting alkaline electrolyzed water is not disclosed in the prior art; in addition, the supercritical carbon dioxide is a green solvent and can generate swelling effect on the polymer, so that the crystallinity, the glass transition temperature and the like of the polymer are changed. The method combines the supercritical carbon dioxide and the alkaline electrolysis water to pretreat the biomass, can exert the advantages of the supercritical carbon dioxide and the alkaline electrolysis water, and further promotes the hydrolysis reaction of the biomass to prepare the reducing sugar.

Disclosure of Invention

An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.

To achieve these objects and other advantages in accordance with the present invention, there is provided a method for recycling waste biomass using alkaline electrolyzed water, comprising the steps of:

adding waste biomass and alkaline electrolyzed water A into a high-pressure reactor, injecting high-pressure carbon dioxide into the reactor, keeping the temperature at 60-80 ℃ and the pressure at 12-25 MPa for 30-90 min, decompressing, then adding ionic liquid and alkaline electrolyzed water B, injecting the high-pressure carbon dioxide into the reactor again, keeping the temperature at 85-125 ℃ and the pressure at 10-20 MPa for 60-90 min, opening a valve to decompress after the supercritical carbon dioxide treatment is finished, performing solid-liquid separation on reaction materials after decompression, recovering liquid, and drying solid to obtain a product;

wherein potassium carbonate or sodium carbonate is used as electrolyte to obtain alkaline stock solution through electrolysis, and the alkaline stock solution is diluted by 10-20 times to obtain alkaline electrolyzed water A; diluting the alkaline stock solution by 40-50 times to obtain alkaline electrolyzed water B;

the oxidation-reduction potential ORP of the alkaline stock solution is-800 mv to-1300 mv; the pH value of the alkaline stock solution is 12.00-13.50.

Preferably, in the process of obtaining the alkaline stock solution by electrolysis with potassium carbonate as electrolyte: the mass concentration of the adopted potassium carbonate solution is 10-25%, and the conductivity is 12000-50000 mS/m; the mass concentration of the adopted sodium carbonate solution is 25-45%, and the conductivity is 5000-10000 mS/m; the current of the electrolysis is 8-12A.

Preferably, the weight ratio of the waste biomass to the alkaline electrolyzed water a is 1: 12-25; the weight ratio of the waste biomass to the ionic liquid is 1: 5-8; the weight ratio of the waste biomass to the alkaline electrolyzed water B is 1:8 to 10.

Preferably, the ionic liquid is any one of 1-ethyl-3-methylimidazolium acetate, 1-allyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium chloride, and 1-ethyl-3-methylimidazolium chloride.

Preferably, before solid-liquid separation, the reaction materials are added into a vacuum packaging bag for vacuum packaging, and the vacuum degree is controlled to be 0.1 MPa; and (3) putting the vacuum packaging bag into high static pressure treatment equipment, sealing the pressurizing cavity, and pressurizing to perform high static pressure treatment.

Preferably, the parameters of the high static pressure treatment are as follows: raising the pressure to 400-650 MPa at a pressure raising speed of 8-10 MPa/s, and carrying out pressure maintaining treatment for 15-25 min at normal temperature.

Preferably, the method further comprises the steps of adding the hydrogen peroxide solution into the reaction materials, stirring and mixing the mixture, adding the mixture into a vacuum packaging bag, and carrying out vacuum packaging.

Preferably, the mass fraction of the hydrogen peroxide solution is 20-35%; the mass ratio of the reaction materials to the hydrogen peroxide solution is 1: 2-3.

Preferably, the waste biomass is any one of straw, processing residues of forest products and landscaping garbage.

Preferably, the straw is any one of rice straw, corn straw, wheat straw, sorghum straw and bamboo straw.

The invention at least comprises the following beneficial effects: alkaline electrolyzed water and supercritical carbon dioxide are adopted to pretreat biomass, so that the structure of the biomass can be effectively destroyed, and convenience is provided for subsequent hydrolysis reaction. The supercritical carbon dioxide which is a green solvent is used for blasting biomass fibers, so that the biomass fibers are loosened by winding a compact space structure, the dissolution of cellulose is improved by adopting ionic liquid, and the degradation of waste biomass is improved by adopting alkaline electrolyzed water; the process further improves the reducing sugar yield of the waste biomass, increases the utilization rate of the raw materials, and improves the harsh conditions of ordinary high-temperature (more than 280 ℃) hydrolysis.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

The specific implementation mode is as follows:

the present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.