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Method for preparing acrylic aldehyde by biological glycerol dehydration

A technology for acrolein and glycerin, which is applied in the preparation of carbon-based compounds, organic compounds, chemical instruments and methods, etc., can solve the problem of no obvious change in the molar selectivity of acrolein, low conversion rate of acrolein to glycerin, and the conversion of glycerin The efficiency is not high, to achieve the effect of renewable use of corrosion, molar selectivity, high conversion rate of glycerin, and fast rate

Active Publication Date: 2009-04-29
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this result cannot be repeated. In fact, the selectivity of acrolein is only about 8-10%. Even if the temperature is raised, the molar selectivity of acrolein has no obvious change, and the conversion rate of glycerol in the whole reaction is not high.
[0013] In the above-mentioned patent reports, although the "green" solid acid catalyst is used to reduce the investment in equipment, there are problems such as the molar selectivity of acrolein and the conversion rate of glycerin are not high, and there are many by-products

Method used

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  • Method for preparing acrylic aldehyde by biological glycerol dehydration

Examples

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Effect test

Embodiment 1

[0042] Weigh Mn(NO 3 ) 2 About 1.9g of the solution was dissolved in 35ml of distilled water to prepare 2.5% Mn(NO 3 ) 2 aqueous solution. Then measure 10ml of 2.5% Mn(NO 3 ) 2 aqueous solution, with 10g Al 2 o 3 Molecular sieves were mixed, heated and stirred in a 100ml beaker at 80°C for 4 hours, then dried in an oven at 120°C for 8 hours, and the dried modified zeolite molecular sieves were put into a muffle furnace and roasted at 350°C for 4 hours, and finally It is crushed to 18-30 mesh.

[0043] Prepare 18-30 mesh modified zeolite molecular sieve loaded heteropolyacid catalyst, prepare the catalyst by equal volume impregnation method, calculate the amount of silicotungstic heteropolyacid used according to the loading capacity of 20%, and then according to the calculated amount of heteropolyacid, weigh Take 2g of heteropoly acid to prepare an aqueous solution, and then mix the broken 18-30 mesh modified Al 2 o 3 The zeolite molecular sieve carrier was poured int...

Embodiment 2

[0046] Weigh Ca(NO 3 ) 2 About 2.4g, dissolved in 57.6ml of distilled water, prepared to obtain 4% Ca(NO 3 ) 2 aqueous solution. Then measure 10ml of 4% Ca (NO 3 ) 2 aqueous solution, with 10g Al 2 o 3 Molecular sieves were mixed, heated and stirred in a 100ml beaker at 80°C for 4 hours, then dried in an oven at 120°C for 8 hours, and the dried modified zeolite molecular sieves were put into a muffle furnace and roasted at 350°C for 4 hours, and finally It is crushed to 18-30 mesh to obtain Ca-Al 2 o 3 carrier.

[0047] Prepare 18-30 mesh modified zeolite molecular sieve loaded heteropolyacid catalyst, prepare the catalyst by equal volume impregnation method, calculate the amount of phosphotungstic heteropolyacid used according to the loading capacity of 20%, and then according to the calculated amount of heteropolyacid, weigh Take 2g of heteropoly acid to prepare an aqueous solution, and then mix the broken 18-30 mesh modified Al 2 o 3 The zeolite molecular sieve ...

Embodiment 3

[0050] Weigh 2.9gCo(NO 3 ) 2 , dissolved in about 55ml of distilled water to prepare 5% Co(NO 3 ) 2 aqueous solution, and then measure 10ml of 5% Co(NO 3 ) 2 aqueous solution, with 10g Al 2 o 3 Molecular sieves were mixed, heated and stirred in a 100ml beaker at 80°C for 4 hours, then dried in an oven at 120°C for 8 hours, and the dried modified zeolite molecular sieves were put into a muffle furnace and roasted at 350°C for 4 hours, and finally It is crushed to 18-30 mesh to obtain 5% Co-Al 2 o 3 carrier; then weigh about 2.4g Cu(NO 3 ) 2 , dissolved in about 45.6ml of distilled water, prepared to obtain 5% Cu(NO 3 ) 2 Aqueous solution, measure 10ml of 5% Cu(NO 3 ) 2 aqueous solution, with 10g 5% Co-Al 2 o 3 Molecular sieves were mixed, heated and stirred in a 100ml beaker at 80°C for 4 hours, then dried in an oven at 120°C for 8 hours, and the dried modified zeolite molecular sieves were put into a muffle furnace and roasted at 350°C for 4 hours to obtain Co ...

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Abstract

The invention discloses a preparation method of acrolein, taking biological glycerol as the raw material and the modified zeolite supported heteropolyacid as catalyst, the method prepares acrolein directly by dehydration reaction. 18 to 30 catalyst are put in the middle section of a normal pressure continuous fixed bed reactor, with the volume space velocity of 1 to 10 h<-1>; under the protection of N2, the catalyst bed raises the temperature to 180 to 540 DEG C, and the biological glycerol solvent which is added with inhibitor is put into the fixed bed reactor from a micro pump; after gasified, the glycerine solution reacts by the catalyst bed. After reaction, the product is absorbed by acetone, then is separated and purified, thus obtaining acetone. The invention adopts the alkali metal, phosphoric oxides, alkali metal compound improved catalyst as carrier to carry heteropoly acid catalyst which is green and environmental catalyst and has the advantages of high activity, regeneration property, no pollution, simple reaction, operation process, low production cost, high mole selectivity of acrolein and high conversion rate of biological glycerol.

Description

technical field [0001] The invention relates to a new method for preparing acrolein by dehydration of biomass raw material bioglycerol, specifically, a method for preparing acrolein by continuous dehydration under the action of a catalyst using bioglycerin, a by-product of biodiesel, as raw material. Background technique [0002] Bioglycerol is a by-product of biodiesel, and 1 ton of bioglycerol is produced for every 10 tons of biodiesel produced. As a "petroleum plant" with great potential for green and clean alternative fuels in the 21st century, biodiesel has shown a strong development trend in the field of fossil fuel substitutes due to its renewability and good environmental friendliness. wide attention from all over the world. In addition, as people accelerate the development of renewable resources, the deep processing technology of bioglycerol as a by-product of biodiesel has attracted much attention and has become a research hotspot. [0003] Acrolein is an importa...

Claims

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Application Information

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IPC IPC(8): C07C47/22C07C45/51B01J29/06
Inventor 张跃严生虎刘建武谢国红沈介发
Owner 溧阳常大技术转移中心有限公司
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