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Application of hydrotalcite-based catalyst in conversion of high-concentration sugar into 1,2-propylene glycol

A hydrotalcite-based, catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, preparation of hydroxyl compounds, etc., can solve the problems of constraints, poor product selectivity, multi-step reaction, etc. Achieve the effects of high conversion efficiency, high added value of products, and simple and easy preparation

Active Publication Date: 2020-01-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In recent years, (document 9: a method for preparing 1,2-propanediol by metal hydrothermal reduction of carbohydrates, CN104557461 B; document 10: a method for utilizing glucose to synthesize 1,2-propanediol, CN 104961625 A) adopts sugar catalysis The transformation and preparation of 1,2-propanediol has also made great progress, but there are still shortcomings such as poor product selectivity and multi-step reactions, which seriously restrict the production of 1,2-propanediol

Method used

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  • Application of hydrotalcite-based catalyst in conversion of high-concentration sugar into 1,2-propylene glycol
  • Application of hydrotalcite-based catalyst in conversion of high-concentration sugar into 1,2-propylene glycol
  • Application of hydrotalcite-based catalyst in conversion of high-concentration sugar into 1,2-propylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Pt / Cu 1 Mg 3 Al 1 O catalyst preparation:

[0042] Weigh 0.01 mol of copper nitrate, 0.03 mol of magnesium nitrate and 0.01 mol of aluminum nitrate, dissolve them in deionized water to form mixed salt solution A. In addition, equimolar sodium carbonate and sodium hydroxide were dissolved in deionized water (the molar ratio of sodium carbonate and sodium hydroxide was 4:3; the solution was neutral after the theoretical reaction), and mixed alkali solution B was prepared. Add A dropwise to B in a constant temperature water bath at 40°C, and use a constant flow pump to control the drop rate to 3mL min -1 , stirring vigorously during the dropwise addition. After the dropwise addition, the pH of the above suspension was adjusted to 10 with 3M NaOH solution, and the stirring and crystallization was continued in a constant temperature water bath at 70° C. for 18 hours to obtain a precipitate. After the steps of suction filtration, washing and drying, a hydrotalcite precur...

Embodiment 2

[0045] Pd / Cu 1 Mg 3 Al 1 O catalyst preparation:

[0046] Weigh 0.01 mol of copper nitrate, 0.03 mol of magnesium nitrate and 0.01 mol of aluminum nitrate, dissolve them in deionized water to form mixed salt solution A. In addition, equimolar sodium carbonate and sodium hydroxide were dissolved in deionized water (the molar ratio of sodium carbonate and sodium hydroxide was 4:3; the solution was neutral after the theoretical reaction), and mixed alkali solution B was prepared. Add A dropwise to B in a constant temperature water bath at 40°C, and use a constant flow pump to control the drop rate to 3mL min -1 , stirring vigorously during the dropwise addition. After the dropwise addition, the pH of the above suspension was adjusted to 10 with 3M NaOH solution, and the stirring and crystallization was continued in a constant temperature water bath at 70° C. for 18 hours to obtain a precipitate. After the steps of suction filtration, washing and drying, a hydrotalcite precur...

Embodiment 3

[0049] Pt / Ni 0.5 Cu 0.5 Mg 3 Al 1 O catalyst preparation:

[0050] Weigh 0.005 mol of copper nitrate, 0.005 mol of nickel nitrate, 0.03 mol of magnesium nitrate and 0.01 mol of aluminum nitrate, dissolve them in deionized water to form mixed salt solution A. In addition, equimolar sodium carbonate and sodium hydroxide were dissolved in deionized water (the molar ratio of sodium carbonate and sodium hydroxide was 4:3; the solution was neutral after the theoretical reaction), and mixed alkali solution B was prepared. Add A dropwise to B in a constant temperature water bath at 40°C, and use a constant flow pump to control the drop rate to 2mL min -1 , stirring vigorously during the dropwise addition. After the dropwise addition, the pH of the above suspension was adjusted to 10 with 3M NaOH solution, and the stirring and crystallization was continued in a constant temperature water bath at 65° C. for 18 h to obtain a precipitate. After the steps of suction filtration, washi...

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Abstract

The invention provides application of a hydrotalcite-based catalyst in conversion of high-concentration sugar into 1,2-propylene glycol, and belongs to the technical field of energy and chemical engineering. A hydrotalcite precursor is prepared by adopting a coprecipitation method, then metal is introduced by utilizing dipping, adsorption and exchange methods, a metal-promoted metal-composite oxide catalyst is obtained by roasting and reduction, and the catalyst shows relatively high selectivity in a reaction of catalytically converting high-concentration sugar into 1,2-propylene glycol. The catalyst provided by the invention has the advantages of simple synthesis, high catalyst activity, good stability and the like, and the reaction has the characteristics that the raw materials are renewable resources and the atom economy is high. Besides, compared with other technologies for preparing 1,2-propylene glycol by taking biomass as a raw material, the process has the advantages of simplereaction process, high space-time yield, convenience in industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical industry, and specifically relates to the application of a hydrotalcite-based catalyst in converting high-concentration sugar into 1,2-propanediol. Background technique [0002] With the shortage of fossil resources and the aggravation of environmental pollution, the development of new renewable carbon resource utilization has become a very urgent issue. Biomass is an abundant renewable resource, and its conversion into high value-added chemicals has attracted extensive attention. Sugar compounds are the core of biorefinery, which can be obtained from biomass hydrolysis (enzyme hydrolysis, acid hydrolysis) through heterogeneous catalysis. The process of producing glucose from starch has long been industrialized, and the hydrolysis technology of lignocellulose has also made great progress in recent years. The U.S. National Renewable Energy Laboratory uses a countercurrent shrinkage hy...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C31/20C07C29/00
CPCB01J23/8946B01J23/896C07C29/00C07C31/205Y02P20/52
Inventor 庞纪峰郑明远姜宇赵宇张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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