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High-efficiency composite catalyst for preparing acrylic acid by using lactic acid for catalytic dehydration and preparation method and application of high-efficiency composite catalyst

A composite catalyst and catalytic dehydration technology, applied in the field of catalytic chemistry, can solve problems that have not been reported in research, achieve high selectivity and maintain stability

Inactive Publication Date: 2015-03-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst prepared by the present invention has excellent properties such as good stability and reusability, and at present, research in this area has not yet been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh a certain amount of HZSM-5 molecular sieve, and roast it at 550°C for 4h; the calcined HZSM-5 molecular sieve is desiliconized and modified with 0.5M sodium hydroxide solution in 80°C aqueous solution at a liquid-solid ratio of 7.5mL / g, and then washed with water , dry; then use 0.05mol / L Ca(NO 3 ) 2 The solution was treated in a water bath at 30°C for 8 hours, washed with water, dried, and calcined; finally, the calcined molecular sieve was treated with 0.6mol / L Na 2 HPO 4 The solution was further modified and dried to obtain the desired catalyst.

[0022] Weigh 1.5 g of the above-mentioned catalyst and load it into a fixed-bed reactor with an inner diameter of 8 mm and a height of 360 mm, and the upper and lower parts of the catalyst are filled with inert and uniform small ceramic balls. Reaction temperature 375°C, carrier gas N 2 The flow rate is 35mL / min, and the space velocity is 1.3h -1 , the concentration of the feed solution is 40wt%, and in the dehyd...

Embodiment 2

[0024] Weigh a certain amount of HZSM-5 molecular sieve, and roast it at 550°C for 4h; the calcined HZSM-5 molecular sieve is desiliconized and modified with 0.5M sodium hydroxide solution in 80°C aqueous solution at a liquid-solid ratio of 7.5mL / g, and then washed with water , dry; and then this molecular sieve is mixed with 0.05mol / L CaCl according to the same liquid-solid ratio 2 The solution was treated in a water bath at 30°C for 8 hours, washed with water, and dried; finally, the roasted molecular sieve was treated with 0.6mol / L Na 2 HPO 4 The solution was further modified and dried to obtain the desired catalyst.

[0025] Weigh 1.5 g of the above-mentioned catalyst and load it into a fixed-bed reactor with an inner diameter of 8 mm and a height of 360 mm, and the upper and lower parts of the catalyst are filled with inert and uniform small ceramic balls. Reaction temperature 390°C, carrier gas N 2 The flow rate is 35mL / min, and the space velocity is 1.3h -1 , the co...

Embodiment 3

[0027]Weigh a certain amount of HZSM-5 molecular sieve, and roast it at 550°C for 4h; the calcined HZSM-5 molecular sieve is desiliconized and modified with 0.5M sodium hydroxide solution in 80°C aqueous solution at a liquid-solid ratio of 7.5mL / g, and then washed with water , dry; and then this molecular sieve with 0.05mol / L of BaCl according to the same liquid-solid ratio 2 The solution was treated in a water bath at 30°C for 8 hours, washed with water, and dried; finally, the roasted molecular sieve was treated with 0.6mol / L Na 2 HPO 4 The solution was further modified and dried to obtain the desired catalyst.

[0028] Weigh 1.5 g of the above-mentioned catalyst and load it into a fixed-bed reactor with an inner diameter of 8 mm and a height of 360 mm, and the upper and lower parts of the catalyst are filled with inert and uniform small ceramic balls. Reaction temperature 365°C, carrier gas N 2 The flow rate is 35mL / min, and the space velocity is 1.3h -1 , the concentra...

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Abstract

The invention belongs to the technical field of catalytic chemistry, and relates to a high-efficiency composite catalyst for preparing acrylic acid by using lactic acid for catalytic dehydration and a preparation method and application of the high-efficiency composite catalyst. The preparation method comprises the following steps: firstly, performing modification treatment on HZSM-5 by using an alkali liquid with certain concentration, thereby obtaining ZSM-5 with certain mesopores, wherein the obtained catalyst is named as ZSM-5-AT; further modifying ZSM-5-AT through metal ion exchange or a metal salt steeping method; finally treating the modified catalyst by using a phosphate solution for modification so as to obtain the composite modified catalyst which can be used in reaction that acrylic acid is prepared by efficiently catalyzing lactic acid to dehydrate. The catalyst provided by the invention has characteristics of high stability, high selectivity, high reproducibility and the like when being used for preparing acrylic acid by using lactic acid through dehydration, and the industrial large-scale production requirements are well met; moreover the lactic acid is prepared from a biomass fermentation product lactic acid as a raw material, and practice basis is also made for alleviating the over-dependence of acrylic acid on oil resources.

Description

technical field [0001] The invention belongs to the technical field of catalytic chemistry, and relates to a high-efficiency composite catalyst for preparing acrylic acid by catalytic dehydration of lactic acid, a preparation method and an application thereof. Background technique [0002] Acrylic acid and its ester series are extremely important chemical raw material monomers that have attracted much attention at present, showing broad application prospects in industries such as mining, coatings, chemical fibers, oil extraction, adhesives, and water purification. At present, the two-step oxidation of propylene is widely used in the industry to prepare acrylic acid, but this method relies on petroleum, which has limited the further expansion of the production scale of acrylic acid due to its non-renewability and the slightly higher price trend of crude oil in the international market in recent years. In order to avoid problems such as the increase in the production cost of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C57/065C07C51/377
Inventor 张雄福张向辉董雅楠刘海鸥
Owner DALIAN UNIV OF TECH
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