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Method for preparing organic chemicals through photocatalytic oxidation degradation of biomass

A photocatalytic oxidation and organic chemical technology, applied in catalyst activation/preparation, organic chemistry, chemical instruments and methods, etc., can solve the problems of cumbersome follow-up treatment, environmental pollution, harsh reaction conditions, etc., to speed up the degradation reaction rate, Improved photon efficiency and mild reaction conditions

Inactive Publication Date: 2016-12-07
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's biomass resources are extremely rich, but their utilization is very limited, especially crop straw biomass, which is mainly used for feed, building materials and biogas power generation, while in some areas it is burned directly on the spot, which not only has not been rationally utilized, but also caused serious environmental pollution
At present, biomass utilization technologies mainly include biological methods and thermochemical conversion methods, which can convert biomass into biofuels and small molecule organic chemicals, such as bio-fermentation, thermal cracking, alcoholysis liquefaction and gasification to prepare bioethanol, Biodiesel and biomass oil, etc.; however, these conversion technologies have many problems such as high energy consumption, complex equipment, low conversion rate, harsh reaction conditions, cumbersome follow-up treatment, high cost and many residues, which restrict their development
Moreover, the conversion products are still mainly used as fuel, and the chemical resources of biomass cannot be fully utilized
For example, the residue after biomass degradation often contains a large amount of valuable chemicals including benzene and polycyclic aromatic hydrocarbons. If not properly disposed of, it will cause waste of resources and serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Take 100.0 mL of absolute ethanol in a beaker with a measuring cylinder, slowly drop 40.0 mL of butyl titanate into it under magnetic stirring, and stir for 30 min; take 0.1 mol / L of NH 4 F solution 60.0mL, stir the two evenly, and mix thoroughly; adjust the pH value of the solution to weakly acidic pH 4.2 with 0.5mol / L hydrofluoric acid, continue magnetic stirring for about 1h; stop stirring, remove most of the water, and use 100mL Wash with deionized water, wash three times, fully dry the solid phase at 120°C; place the dried solid in a tubular resistance furnace for calcination at 750°C for 4 hours, and grind it into a fine powder with a ball mill after cooling, with a particle size of less than 0.05 μm , to obtain F-modified doped TiO 2 Base photocatalyst 28.6g.

[0040] Take 0.2mol / L NaBrO 3 Add 100.0 mL of the solution as an oxidant into a 250 mL glass reaction vessel, add 2.5 g of modified catalyst, adjust the pH of the system to 9.2 with 0.5 mol / L N...

Embodiment 2

[0043] Embodiment 2: take by weighing 20.0g Ti(SO 4 ) 2 Add to 80.0mL deionized water, sonicate until Ti(SO 4 ) 2 After all dissolved, the solution was transferred into a 100 mL autoclave lined with polytetrafluoroethylene, and after adding 4.0 g of NaF, the autoclave was quickly closed. Hydrothermal reaction at 170°C for 48 hours; after the reaction was completed, cool naturally to room temperature, centrifuge, and wash the centrifuged solid with 500mL deionized water until there is no SO 4 2- ; Dry at 80°C for 12h to obtain 12.0g xerogel. After the dry gel is ground into powder, it is placed in a tubular resistance furnace, and the temperature is raised to 750 °C at a heating rate of 2 °C / min, and then roasted for 4 hours, and then naturally lowered to room temperature, the F-doped modified TiO can be obtained. 2 catalyst of light.

[0044] Take 0.1mol / L of Na 2 S 2 o 8 Add 100.0 mL of the solution as an oxidant into a 250 mL glass reaction vessel, add 2.0 g of modi...

Embodiment 3

[0047] Embodiment 3: take by weighing 6.0g Fe(NO 3 ) 3 and 8.0g Ti(SO 4 ) 2 Add it into 90.0 mL of deionized water, sonicate until the solid powder is completely dissolved, adjust the pH of the solution to 8.5, transfer the solution into a 100 mL autoclave lined with polytetrafluoroethylene, and quickly close the autoclave. Hydrothermal reaction at 120°C for 36 hours; after the reaction was completed, naturally cool to room temperature and centrifuge, and the centrifuged solid was washed with 300mL deionized water until there was no NO 3 - and SO 4 2- ; Dry at 80°C for 12h to obtain 7.6g xerogel. After the dry gel is ground into powder, it is placed in a tubular resistance furnace, and the temperature is raised to 750 °C at a heating rate of 2 °C / min, and then roasted for 4 hours, and then naturally lowered to room temperature, the Fe-doped modified TiO can be obtained. 2 catalyst of light.

[0048] Take 0.5mol / L of H 2 o 2 Add 80.0 mL of the solution as an oxidant i...

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Abstract

The invention relates to a method for preparing organic chemicals through photocatalytic oxidation degradation of biomass, and belongs to the method for preparing the organic chemicals through the biomass. According to the photocatalytic oxidation method, a modified photochemical catalyst is used for being coupled with an oxidant, a photocatalytic oxidation system is established, so that the biomass is high-efficiently degraded under a mild condition, and a feasible way is further provided for extraction and utilization of high added value chemicals in the degraded products. The method comprises the following steps of firstly, synthesizing a metal-nonmetal load type TiO2 photochemical catalyst, then using a liquid phase chemical reagent as the oxidant, adjusting the pH value to be alkalic, performing irradiation with sunlight or ultraviolet light, and establishing the photocatalytic oxidation system. The system can effectively degrade organic macromolecules of the biomass into small molecules, and high added value chemicals comprise aldehyde, alkone, carboxylic acid and other aromatic compounds. The method disclosed by the invention has the advantages of cleanness, high efficiency, good selectivity, low cost and the like, can develop a new way for mild and rapid degradation of the biomass, and realize cleanness, the high efficiency and the comprehensive utilization of the biomass.

Description

technical field [0001] The invention relates to a method for preparing organic chemicals from biomass, in particular to a method for preparing organic chemicals by photocatalytic oxidation and degradation of biomass. Background technique [0002] Biomass can be used to produce a variety of fuels and chemicals, and it has gradually developed into a reliable and long-term resource. my country's biomass resources are extremely rich, but their utilization is very limited, especially crop straw biomass, which is mainly used for feed, building materials and biogas power generation, while in some areas it is burned directly on the spot, which not only has not been rationally utilized, but also caused serious environmental pollution. At present, biomass utilization technologies mainly include biological methods and thermochemical conversion methods, which can convert biomass into biofuels and small molecule organic chemicals, such as bio-fermentation, thermal cracking, alcoholysis l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G1/00C07G99/00B01J21/06B01J23/745B01J37/03B01J37/10
CPCC07G1/00B01J21/063B01J23/745B01J37/036B01J37/10C07G99/00B01J35/39
Inventor 路瑶陆永超魏贤勇宗志敏
Owner CHINA UNIV OF MINING & TECH
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