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Method of using agricultural and forestry waste to prepare solid-acid catalyst

A solid acid catalyst, agricultural and forestry waste technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of easy deactivation cost, weak acidity, etc., and achieve resource utilization, Mild conditions and easy-to-control effects

Inactive Publication Date: 2012-06-27
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results show that these solid acids have high catalytic activity, and the products are easy to separate and clean and environmentally friendly. The disadvantages are weak acidity, easy deactivation and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 50g of crushed dry corn stalks, wheat straws, rice straws, sorghum straws, soybean straws, cotton straws, bamboo chips, and wood chips and put them into different three-neck bottles; carbonize at 350°C for 10 hours under nitrogen protection to obtain Black solid, ground into powder after cooling;

[0021] Take 20g of powder and put it into a three-neck bottle, under the protection of nitrogen, use 200mL of concentrated sulfuric acid to sulfonate at 100°C for 15h, after cooling, add the mixture to 200mL of deionized water to wash and filter; then use hot deionized water (80°C) Wash the obtained solid repeatedly until the washed liquid does not contain SO 4 2- The ions are the highest, and the solid acid catalyst is obtained by drying the solid in an oven at 105°C.

[0022] Application effect: Add 25.1g (0.1mol) of oleic acid, 58.9mL (1mol) of absolute ethanol, and 0.4 g of solid acid catalyst into a round bottom flask, reflux at 80 °C, and react for 8 hours. Diffe...

Embodiment 2

[0024] Put 50g of crushed dry corn stalks and 50g of wheat stalks into a three-necked bottle; under the protection of nitrogen, carbonize at 250°C for 15 hours to obtain a black solid, which is ground into powder after cooling;

[0025] Take 20g of powder into a three-necked bottle, sulfonate with 400mL of concentrated sulfuric acid at 200°C for 10h under the protection of nitrogen, cool to room temperature, add the mixture to 200mL of deionized water, wash and filter; then use hot (85°C) to remove The obtained solids were repeatedly washed with ionic water until the washed liquid contained no SO 4 2- The ions are to , and the solid acid catalyst can be obtained after drying.

[0026] Application effect: Add 25.1g (0.1mol) of oleic acid, 58.9mL (1mol) of absolute ethanol, and 0.4 g of solid acid catalyst into a round bottom flask, reflux at 80 °C, react for 8 hours, and mix corn-wheat The solid acid catalyst prepared from straw was used to catalyze the conversion rate of ole...

Embodiment 3

[0028] Take 50g of crushed bamboo chips and 50g of crushed wood chips and add them into a three-necked bottle; under the protection of nitrogen, carbonize at 250°C for 10h to obtain a black solid, which is ground into powder after cooling;

[0029] Take 20g of powder into a three-necked bottle, sulfonate with 300mL of concentrated sulfuric acid at 150°C for 20h under the protection of nitrogen, cool to room temperature, add the mixture to 200mL of deionized water, wash and filter; then use hot (90°C) to remove The obtained solids were repeatedly washed with ionic water until the washed liquid contained no SO 4 2- The ions are to , and the solid acid catalyst can be obtained after drying.

[0030] Application effect: Add 25.1g (0.1mol) of oleic acid, 58.9mL (1mol) of absolute ethanol, and 0.4g of solid acid catalyst into a round bottom flask, reflux at 80 ℃, react for 8 hours, and the bamboo chips-wood chips mixture The prepared solid acid catalyst was used to catalyze the co...

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PUM

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Abstract

The invention discloses a method of using agricultural and forestry wastes to prepare a solid-acid catalyst. The method comprises the following steps: firstly carbonizing dry agricultural and forestry wastes under the protection of nitrogen at 250-350 DEG C for 10-15h, secondly adding concentrated sulphuric acid to sulfonate at 100-200 DEG C for 10-20h under the protection of nitrogen and obtain a mixture, repeatedly washing the mixture with hot water to ensure that no SO4<2-> exists in the mixture, filtering, and drying to obtain the solid-acid catalyst. The invention has simple preparation technology and cheap and accessible raw materials; and the obtained solid-acid catalyst has the advantages of high acidity, high catalytic activity, good stability, possibility of repeated use and thelike, is an environmentally friendly catalyst and can be widely used.

Description

technical field [0001] The invention belongs to the technical field of solid acid catalysts, and relates to a method for preparing solid acid catalysts from agricultural and forestry wastes. Background technique [0002] Traditional homogeneous acid catalysts such as sulfuric acid, phosphoric acid, aluminum trichloride, and p-toluenesulfonic acid are widely used in chemical production processes such as alkylation, esterification, hydrolysis, and hydration. More than 15 million tons of sulfuric acid are consumed as catalysts annually (Hara, M, et al. Angew Chem Int Ed , 2004, 43: 2955-2958). The advantages of these homogeneous acids are low cost, strong acidity and high catalytic efficiency. But there are also many disadvantages, such as: (1) It is highly corrosive to equipment and requires expensive corrosion-resistant materials, which increases production costs; (2) It is difficult to separate the catalyst from the reaction system, and a large number of by-products are ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02B01J37/08B01J37/02
Inventor 高锦明张增强马芳马海龙杜宏涛
Owner NORTHWEST A & F UNIV
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