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Magnetic solid acid and preparation method thereof

A magnetic solid acid and magnetic technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as difficult large-scale production and commercial application, complex chemical reaction process, expensive raw materials, etc. , to achieve the effects of easy large-scale production, broad application prospects, and low raw material cost

Inactive Publication Date: 2013-09-25
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, it requires a very complicated chemical reaction process and uses relatively expensive raw materials, which makes it difficult to produce on a large scale and commercially apply.
[0004] At the same time, as a large agricultural production and consumption country, China produces up to 1 billion tons of waste lignocellulosic biomass (such as rice, wheat straw, etc.) every year, and a considerable part of them is burned directly in the field. processing, and this processing method will bring serious environmental problems

Method used

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  • Magnetic solid acid and preparation method thereof
  • Magnetic solid acid and preparation method thereof
  • Magnetic solid acid and preparation method thereof

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preparation example Construction

[0029] The invention provides a preparation method of magnetic solid acid, such as figure 1 shown, including the following steps:

[0030] Step 1: Adsorb iron ions on lignocellulosic biomass to obtain iron-loaded biomass, in which iron ions can be ferrous iron or ferric iron, and lignocellulosic biomass can include straw or trees or sawdust or sawdust And many other options. The adsorption method can adopt methods well known to those skilled in the art, preferably as follows: add lignocellulosic biomass to the solution containing iron ions, heat and stir the mixed solution, then carry out solid-liquid separation treatment on the mixed solution and The obtained solid is dried to obtain the iron-loaded biomass. The solid-liquid separation treatment of the mixed solution and the drying of the obtained solid are for the convenience of the subsequent pyrolysis process, and can also ensure that bio-oil can be obtained during the pyrolysis process. In addition, solid-liquid separat...

Embodiment 1

[0040] (1) Weigh 2.70g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) Dissolve in 100mL deionized water to obtain a 0.1mol / L ferric chloride solution, then weigh 10g of waste sawdust biomass, add it to the prepared ferric chloride solution, place it in a water bath magnetic stirrer, and put the The temperature was raised to 50°C, stirred at a speed of 300r / min for 180min, and then the water was distilled off under reduced pressure by a rotary evaporator, and the obtained solid was dried in an oven to obtain iron-loaded biomass;

[0041] (2) Pyrolyze the iron-loaded biomass obtained in step (2) at 500°C under a nitrogen atmosphere for 1 hour to obtain a magnetic porous carbon precursor, and at the same time, bio-oil resources can also be obtained;

[0042] (3) Weigh 3 grams of magnetic porous carbon precursor and place it in a long-necked flask, add 30 mL of concentrated sulfuric acid, react at 150 °C for 12 hours, then pour the reaction mixture into 1000 mL of water, and then f...

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Abstract

The invention discloses a magnetic solid acid and a preparation method thereof. The preparation method comprises the steps that: iron ions are absorbed on lignocellulose biomass, such that iron-loading biomass is obtained; the iron-loading biomass is subjected to pyrolysis under an inert atmosphere, such that a magnetic porous carbon precursor is obtained; the magnetic porous carbon precursor is subjected to sulfonation, such that magnetic solid acid is obtained. According to the invention, waste biomass material is adopted as a raw material. The magnetic porous carbon precursor is prepared through iron ion absorption and pyrolysis, and the precursor is sulfonated, such that the magnetic solid acid is prepared. According to the magnetic solid acid preparation method, the raw material cost is low, the raw material source is wide, large-scale production can easily be carried out, and the method is environment-friendly. The prepared magnetic solid acid has good catalytic effect, and is easy to separate. The acid and the method have good application prospect.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a magnetic solid acid and a preparation method thereof. Background technique [0002] Solid acid is a new type of acid that has been researched and developed in recent years. It is a powder preparation that can replace liquid mineral acids (such as hydrochloric acid, sulfuric acid, phosphoric acid, etc.) reaction, which has broad industrial application prospects. However, when the viscosity of the reaction mixture is high, or when it contains solid reactants or products, the separation process of solid acid from the reaction mixture is usually not very efficient, which leads to a significant reduction in the efficiency of catalytic recycling of solid acid. [0003] Compared with ordinary solid acids, the separation performance of magnetic solid acids is greatly improved, and it can be separated from high-viscosity or solid reaction mixtures by external magnets. The common me...

Claims

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Application Information

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IPC IPC(8): B01J27/02
Inventor 江鸿刘武军田科
Owner UNIV OF SCI & TECH OF CHINA
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