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Carbonaceous solid acid catalyst prepared by direct sulphonation of biomass

A solid acid catalyst and biomass technology, applied in the direction of physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, chemical/physical processes, etc., can solve the problem of disappearing price advantages of carbon catalysts, and achieve Good recovery and reuse effect, rich and renewable raw material resources, and the effect of improving the efficiency of esterification reaction

Inactive Publication Date: 2008-12-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the rapid rise in the price of raw material resources such as sugar, starch or cellulose in recent years, the price advantage of the prepared carbon catalyst is disappearing.

Method used

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  • Carbonaceous solid acid catalyst prepared by direct sulphonation of biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 14g dry wood chips, wheat straw, bean stalks, corn stalks, rice stalks, lignin, rice husks, walnut shells, apricot shells, glucose, sucrose, and starch, and directly add 140g of concentrated sulfuric acid to them, and pass them under nitrogen protection. Carry out the sulfonation reaction at ℃, keep the stirring rate at about 600r / min, after 4 hours of reaction, add the reaction mixture into 300ml distilled water and stir thoroughly, then filter, dry, and wash repeatedly with 100℃ distilled water until the filtrate is completely It is neutral and can be dried to obtain a carbonaceous solid acid catalyst.

[0022] Catalytic effect: put 14g of methanol, 15.86g of oleic acid and 1g of carbonaceous catalyst in the continuous distillation-water separation esterification device to carry out esterification reaction at 90°C (reboiler temperature is 85°C), after 2 hours of reaction Obtain methyl oleate yield and esterification conversion rate as shown in Table 1.

[0023]...

Embodiment 2

[0026] Weigh 14g of dried sawdust and directly add 98g of concentrated sulfuric acid, pass it under nitrogen protection, carry out sulfonation reaction at 100°C, keep the stirring rate at about 600r / min, after reacting for 1h, add the reaction mixture into 300ml of distilled water and stir well , then filtered, dried, and washed repeatedly with distilled water at 100°C until the filtrate was completely neutral, and dried to obtain a carbonaceous solid acid catalyst.

[0027] Catalytic effect: Catalytic effect: 14g of methanol, 15.86g of oleic acid and 1g of carbonaceous catalyst are loaded into the continuous distillation-water separation esterification device to carry out esterification reaction at 70°C (reboiler temperature is 85°C), reaction 6 After one hour, 15.39 g of methyl oleate was obtained, and the esterification rate was 97.03%.

Embodiment 3

[0029] Weigh 14g of dry sawdust and directly add 140g of concentrated sulfuric acid, pass it under nitrogen protection, carry out sulfonation reaction at 50°C, and keep the stirring speed at about 600r / min. After 3 hours of reaction, add the reaction mixture into 300ml of distilled water and stir well. Then filter and dry, and then repeatedly wash with distilled water at 100° C. until the filtrate is completely neutral, and then dry to obtain a carbonaceous solid acid catalyst.

[0030] Catalytic effect: Catalytic effect: 14g of methanol, 15.86g of oleic acid and 0.8g of carbonaceous catalyst are charged into the continuous rectification-water separation esterification device to carry out esterification reaction at 100°C (reboiler temperature is 85°C), and the reaction One hour later, 15.26 g of methyl oleate was obtained, and the esterification rate was 96.22%.

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Abstract

The invention belongs to the novel material and novel energy technical field and relates to a method for preparing a carbonaceous solid acid catalyst and biodiesel, in particular to a method for preparing the carbonaceous solid acid catalyst and the biodiesel by directly sulfonating pure natural biomass. The method is characterized in that: pure natural and renewable biomass is used as a raw material, concentrated sulfuric acid is directly used to sulfonate the biomass into biomass-based carbonaceous solid acid catalyst, and a continuous rectification-water separation esterification reaction process is adopted to perform the catalytic esterification reaction between free fatty acid or waste grease and short chain alcohol to produce the biodiesel. The raw material adopted by the method has rich resource and low cost, is purely natural and renewable, and belongs to the waste utilization; the method has simple preparation technology, mild and controllable reaction conditions, and low manufacturing cost; the catalyst has high activity, good stability, easy recovery and no corrosion to equipment, belongs to an environment-friendly catalyst, is suitable for mass industrialized introduction of the biodiesel, and can also be used for organic reactions such as alkylation, hydrolyzation, hydration and so on.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a method for preparing a carbonaceous solid acid catalyst and biodiesel, in particular to a method for directly sulfonating biomass to prepare a carbonaceous solid acid catalyst and biodiesel. Background technique [0002] With the gradual depletion of oil resources, it is imperative to explore new energy sources. Biodiesel mainly refers to a mixture containing saturated or bad fatty acid monoesters synthesized from animal and vegetable oils and short-chain alcohols through esterification reaction. Because biodiesel has the advantages of being renewable, easy to biodegrade, non-toxic, low in sulfur content and small in emissions of harmful substances, it is a clean and renewable energy, an environmentally friendly fuel, and an excellent substitute for conventional petroleum diesel. . [0003] Chemical production of biodiesel mainly uses chemical catalytic methods such as acid m...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J31/02
Inventor 王同华乌日娜修志龙潘艳秋银建中
Owner DALIAN UNIV OF TECH
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