Carbon-based solid acid as well as preparation method and application thereof

A carbon-based solid acid and solid technology, which is applied to the preparation of carboxylic acid esters, the preparation of ethers by dehydration of hydroxyl-containing compounds, and the preparation of ethers. It can solve unsatisfactory problems and achieve low cost, high acid value, and good catalytic effect.

Inactive Publication Date: 2011-05-18
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, in the inorganic system, zirconia (ZrO 2 ) is treated with sulfuric acid, and the obtained sulfuric acid trace (sulfuric acid trace) zirconia is a solid acid catalyst with the strongest acidity, but there are not many traces of sulfuric acid on the surface, and the number of acid points per unit weight is higher than that of liquid acid Much less, so far from meeting the above requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the synthesis of carbon-based solid acid

[0024] (1) Synthesis reaction of carbon-based solid acid: After stirring and mixing 1mol glucose and 0.2mol isethionic acid evenly, place in a quartz tube muffle furnace, and carry out carbonization condensation reaction at 180°C in nitrogen 20h, obtain black solid;

[0025] (2) Water washing, suction filtration and drying: After the solid is cooled to room temperature, add hot water above 80°C for washing, and filter until the filtrate is clear and acidic, and then put the solid in an oven at 120°C for drying After drying for 1 day, the acid value of the obtained catalyst was 2.0 mmol / g, and the thermal decomposition temperature was 200°C.

Embodiment 2-6

[0027] The preparation method is the same as that of Example 1, except that the polyhydroxy compound is replaced by the compound in Table 1, and the carbonization condensation reaction is carried out at 180°C.

[0028] Table 1. Product performance comparison under different polyols

[0029] Example

Embodiment 7-9

[0031] The preparation method is the same as that of Example 1, except that the carbonization condensation reaction time is according to the time in Table 2 respectively.

[0032] Table 2. Comparison of product properties under different carbonation condensation reaction times

[0033] Example

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PUM

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Abstract

The invention discloses carbon-based solid acid as well as a preparation method and application thereof, belonging to the technical field of chemical synthesis. The preparation method is characterized in that a polyhydroxy compound is used as a raw material, isethionic acid is used as active molecules, the molar ratio of the raw material to the isethionic acid is (2:1)-(10:1), and the carbon-based solid acid is prepared through the steps of: carrying out carbonization and condensation reaction on the polyhydroxy compound and the isethionic acid at 120-400 DEG C for 2-32h, adding hot water above 80 DEG C for washing after the reaction, filtering to remove dissociative acidic substances, and drying the obtained product in a drying oven at 120 DEG C. The carbon-based solid acid has the advantages of high heat stability, high acid value, good catalytic effect, reusability and the like.

Description

Technical field: [0001] The invention relates to a carbon-based solid acid insoluble in polar solvents obtained by carbonizing and condensing polyhydroxy compounds and isethionic acid under high-temperature nitrogen conditions, and the use of the solid acid as a solid acid catalyst. Background technique: [0002] In today's crisis of energy problems and environmental problems, it has become the goal of modern chemical industry to efficiently generate target products with a small amount of energy without producing unnecessary by-products. Acid catalysts are indispensable in the modern chemical industry and are widely used in the manufacture of various products such as pharmaceuticals, petrochemical products, and polymer products. However, most of the currently used liquid acid catalysts are hydrochloric acid and sulfuric acid. . The liquid catalyst used in the production process needs to be neutralized by alkali, and separated and recovered from the product by removing the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C07C67/08C07C69/704C07D317/72C07C37/16C07C39/08C07C41/09C07C43/20
Inventor 梁学正
Owner SHAOXING UNIVERSITY
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