阅读说明：本技术 一种金属有机框架化合物纯化植物纤维预水解液中降解糖的方法 (Method for purifying degraded sugar in plant fiber prehydrolysis liquid by using metal organic framework compound ) 是由 王冠华 司传领 马国治 贾思雨 庞泰然 于 2020-06-29 设计创作，主要内容包括：本发明属于生物质精炼技术领域,主要涉及一种金属有机框架化合物纯化植物纤维预水解液中降解糖的方法。在磁性搅拌下,运用溶剂法将Zn(NO<Sub>3</Sub>)<Sub>2</Sub>·6H<Sub>2</Sub>O溶液快速倒入2-甲基咪唑溶液中,室温下搅拌1-2h,离心将固体产物从乳状胶体分散体中分离出来,用无水乙醇洗涤后干燥研磨后得到ZIF-8纳米颗粒。将ZIF-8纳米颗粒按照一定固液比加入预水解液中进行吸附,吸附温度为20-40℃,pH值为4-7,时间为90-120min,之后离心分离,去除预水解液中的溶解木素、有机酸和糠醛。本发明利用金属有机框架化合物ZIF-8为吸附剂,所采用的方法操作简单,吸附效率高,选择性好。能够有效地去除预水解液中的溶解木素、有机酸和糠醛,同时保留高利用价值的糖类,对实现预水解液高值利用具有重要意义。(The invention belongs to the technical field of biomass refining, and mainly relates to a method for purifying degraded sugar in plant fiber prehydrolysis liquid by using a metal organic framework compound. Zn (NO) is added by a solvent method under magnetic stirring 3 ) 2 ·6H 2 And quickly pouring the O solution into the 2-methylimidazole solution, stirring for 1-2h at room temperature, centrifuging to separate a solid product from the milky colloidal dispersion, washing with absolute ethyl alcohol, drying and grinding to obtain the ZIF-8 nano particles. Adding ZIF-8 nanoparticles into the prehydrolysis liquid according to a certain solid-to-liquid ratio for adsorption, wherein the adsorption temperature is 20-40 ℃, the pH value is 4-7, and the time is 90-120min, and then carrying out centrifugal separation to remove dissolved lignin, organic acid and furfural in the prehydrolysis liquid. The invention uses the metal organic framework compound ZIF-8 as an adsorbent, and the adopted method has the advantages of simple operation, high adsorption efficiency and good selectivity. Can effectively remove dissolved lignin, organic acid and furfural in the prehydrolysis liquid, simultaneously reserve high-value saccharides, and realize high-value benefit of the prehydrolysis liquidThe use is of great significance.)

1. A method for purifying degraded sugars in a plant fiber prehydrolysis liquid by using a metal organic framework compound, which comprises the following steps of:

zn (NO) is added by a solvent method under magnetic stirring₃)₂·6H₂And quickly pouring the O solution into the 2-methylimidazole solution, stirring for 1-2h at room temperature, centrifuging to separate a solid product from the emulsion colloidal dispersion, washing with absolute ethyl alcohol, drying and grinding to obtain ZIF-8 nanoparticles, adding the ZIF-8 nanoparticles into the prehydrolysis liquid according to a certain solid-to-liquid ratio for adsorption at the adsorption temperature of 20-40 ℃, the pH value of 4-7 for 90-120min, centrifuging, removing dissolved lignin, organic acid and furfural in the prehydrolysis liquid, and purifying degraded sugar in the plant fiber prehydrolysis liquid.

2. The method of claim 1 for purifying the degraded sugar in the prehydrolysis liquid of plant fiber by using metal organic framework compound, which is characterized by comprising the following steps: the solvent of the solvent method is one of methanol and distilled water.

3. The method of claim 1 for purifying the degraded sugar in the prehydrolysis liquid of plant fiber by using metal organic framework compound, which is characterized by comprising the following steps: the prehydrolysis liquid is one of plant fiber steam pretreatment hydrolysis liquid, dilute acid pretreatment hydrolysis liquid, hydrothermal pretreatment hydrolysis liquid and steam explosion washing liquid.

[ technical field ] A method for producing a semiconductor device

The invention belongs to the technical field of biomass refining, and mainly relates to a method for purifying degraded sugar in plant fiber prehydrolysis liquid by using a metal organic framework compound.

[ background of the invention ]

Prehydrolysis is an important step in the production of high quality dissolving pulp, in which most of the hemicellulose and a small amount of lignin can be dissolved. At present, the prehydrolysis liquid is mainly mixed with black liquor and then concentrated and combusted together, but the solid content in the prehydrolysis liquid is low, so that the combustion heat value of the black liquor is obviously reduced. The hemicellulose and the degradation products thereof are separated, and can be used for converting and processing high value-added chemicals such as xylitol, fuel ethanol, biodiesel and the like, so that the method is an important way for high-value utilization of prehydrolysis liquid. However, lignin, organic acid, furfural and the like in the prehydrolysis liquid can inhibit the fermentation of hemicellulose to produce xylitol and ethanol, so that the lignin is efficiently removed, and the method has important significance for separating and purifying saccharides and realizing high-value utilization of the prehydrolysis liquid.

The current methods for removing lignin from prehydrolysis liquid mainly comprise the following steps: one is physical method, such as adsorption of lime mud, modified beta-cyclodextrin, active carbon, etc. to eliminate lignin from pre-hydrolyzed liquid. The other is a chemical method, such as flocculation reaction between high molecular substance and lignin, so that lignin is gathered into large particles and removed. Thirdly, a biological method, such as removing the lignin after the lignin is condensed to form macromolecular precipitate by laccase catalysis. However, the current research shows that the combination of a plurality of methods can better remove lignin in prehydrolysis liquid. The physical method and the chemical method can remove the hemicellulose and the degradation products thereof while removing the lignin, and a large amount of lignin still exists in the prehydrolysis liquid after the removal by the physical method and the chemical method. The selectivity of the biological method to lignin is high, the content of other substances in prehydrolysis liquid is hardly influenced, but the process is high in cost and long in time consumption. There is a need to develop a method for removing lignin from prehydrolysis liquid with high efficiency and high selectivity so as to purify degraded sugar in plant fiber prehydrolysis liquid.

Metal Organic Frameworks (MOFs) are zeolite-like compounds formed by self-assembly of Metal ions and organic ligands such as aromatic polyacids through coordination. As a sub-series of MOFs, zeolite imidazolate framework materials (ZIFs) not only have the structural advantages of the MOFs, but also overcome the defects of poor thermal stability and chemical stability of the MOFs to a certain extent. ZIF-8 is a typical representative of metal organic framework materials in ZIFs series and is composed of metal ion Zn²⁺And imidazolyl ligands having a topologyStructural porous materials. Compared with the traditional inorganic material, ZIF-8 has unique properties, ultrahigh specific surface area, stable hydrothermal property and adjustable pore size structure. Due to the unique properties of the ZIF-8 composite material, the ZIF-8 composite material can be applied to other fields such as catalysis, adsorption, gas storage and separation, drug slow release, separation and enrichment, sensing, fluorescence and the like.

[ summary of the invention ]

According to the invention, a metal organic framework compound ZIF-8 is used as an adsorbent, water-soluble micromolecular lignin in the prehydrolysis liquid is selectively and efficiently removed, the high-efficiency separation of hemicellulose and lignin in the prehydrolysis liquid is achieved, and the high-value utilization of the prehydrolysis liquid is realized.

The method mainly comprises the following steps:

zn (NO) is added by a solvent method under magnetic stirring₃)₂·6H₂The O solution was poured quickly into the 2-methylimidazole solution. Stirring at room temperature for 1-2h, and centrifuging to separate the solid product from the milky colloidal dispersion. And washing with absolute ethyl alcohol, drying and grinding to obtain the ZIF-8 nano-particles. After the pre-hydrolysis liquid is centrifugally treated, ZIF-8 nano particles are added into the pre-hydrolysis liquid according to a certain solid-to-liquid ratio for adsorption, the adsorption temperature is 20-40 ℃, the pH value is 4-7, and the time is 90-120min, then the mixture is centrifugally separated, dissolved lignin, organic acid and furfural in the pre-hydrolysis liquid are removed, and degraded sugar in the pre-hydrolysis liquid is purified.

[ detailed description ] embodiments