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Active carbon catalyst, preparation method and application thereof in preparing acrylic acid by dehydrating lactic acid

A technology of activated carbon and catalyst, which is applied to activated carbon catalyst and its preparation and its application field in the preparation of acrylic acid by dehydration of lactic acid, can solve the problem of low conversion rate of lactic acid, achieve good industrial application prospects, less side reactions, and simple and easy process. control effect

Inactive Publication Date: 2009-09-23
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] All the catalysts mentioned above have certain catalytic activity for the dehydration of lactic acid to acrylic acid, but the conversion rate of lactic acid is generally not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 15g of activated carbon, wash it twice with distilled water, and dry it at 120°C; treat the activated carbon with 45ml of 5M aqueous nitric acid solution at 95°C for 1 hour, filter it with suction, and wash it with water until neutral; Treat at room temperature for 0.5h, wash with water after suction filtration and dry at 120°C to obtain acidified and oxidized activated carbon AC4;

[0022] Prepare 20ml of 22% sodium dihydrogen phosphate aqueous solution, add the above-mentioned activated carbon AC4, stir and impregnate at room temperature for 8 hours, spin dry at 60°C, and dry at 120°C to obtain the modified activated carbon catalyst WR-12;

[0023] 6 grams of the catalyst WR-12 prepared above were packed into a fixed-bed reactor with an inner diameter of 10 mm and a height of 500 mm, and the catalyst was filled with inert small ceramic balls or quartz sand up and down. The reaction temperature is 425°C, the nitrogen flow rate is 15ml / min, and the space velocity ...

Embodiment 2

[0025] Weigh 5g of sodium hexametaphosphate, 1.68g of sodium pyrophosphate decahydrate, and 0.58g of potassium pyrophosphate trihydrate, add 20ml of water and heat to dissolve completely, add 5g of activated carbon washed with distilled water, stir and impregnate at 70°C for 5h, Spin dry at 80°C and dry at 120°C to obtain modified activated carbon catalyst WR-18.

[0026] Put 3g of the above prepared catalyst WR-18 into a fixed-bed reactor with an inner diameter of 10 mm and a height of 500 mm. The upper and lower parts of the catalyst are filled with inert small ceramic balls or quartz sand. Reaction temperature 420°C, nitrogen flow rate 30ml / min, space velocity 1h -1 , the weight ratio of water and lactic acid in the raw material is 1:1. Under the above conditions, the catalyst WR-18 catalyzes the dehydration of lactic acid to prepare acrylic acid with a conversion rate of 100% and acrylic acid selectivity of 65%. In contrast, the same ratio of three phosphate mixtures WR-...

Embodiment 3

[0028] Prepare acidified and oxidized activated carbon AC4 by the same method as in Example 1; prepare 20ml of 9% sodium dihydrogen phosphate aqueous solution, add 15g of AC4, stir and impregnate at room temperature for 8h, spin dry at 60°C, and dry at 120°C; prepare 20ml of 7% Add the above activated carbon into the ferrous sulfate aqueous solution, stir and impregnate at room temperature for 8h, spin dry at 60°C, and dry at 120°C to obtain the modified activated carbon catalyst GWR-126;

[0029] 3 g of the catalyst GWR-126 prepared above was loaded into a fixed-bed reactor with an inner diameter of 10 mm and a height of 500 mm, and the upper and lower parts of the catalyst were filled with inert small ceramic balls or quartz sand. Reaction temperature 410°C, nitrogen flow rate 20ml / min, space velocity 1h -1 , the weight ratio of water and lactic acid in the raw material is 1:1. Under the above conditions, the catalyst GWR-126 catalyzed the dehydration of lactic acid to prep...

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PUM

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Abstract

The invention discloses an active carbon catalyst, a preparation method thereof and application thereof in preparing acrylic acid by dehydrating lactic acid. The catalyst is obtained by taking active carbon (AC) or acidified and oxidized active carbon (HOAC) as the primary active component, introducing one or more than one of acid phosphate or metaphosphate or pyrophosphate with immersion method or direct grinding mixing method and drying. The catalyst is used for preparing acrylic acid by dehydrating lactic acid with high lactic acid conversion rate and acrylic acid selectivity, wherein the lactic acid conversion rate is 100% and the acrylic acid selectivity is up to 65%.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and chemical industry, and in particular relates to an activated carbon catalyst, its preparation and its application in the dehydration of lactic acid to prepare acrylic acid. Background technique [0002] Acrylic acid is an important polymer monomer and chemical raw material, widely used in construction, papermaking, leather, textile, plastic processing, packaging materials, daily chemical industry, water treatment, oil recovery, metallurgy and other fields. At present, except for a few companies in the industry that use the acrylonitrile hydrolysis method and the Reppe method, most companies use the two-step oxidation method of propylene to produce acrylic acid. Since propylene is mainly derived from the petroleum refining industry, the method of oxidizing propylene to produce acrylic acid has a great dependence on petroleum resources. Therefore, with the increasing shortage of pe...

Claims

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Application Information

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IPC IPC(8): B01J27/16B01J21/18B01J37/02B01J37/04C07C57/065
Inventor 姜标李青王英雄李丹丹王万军
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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