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Catalyst for catalyzing and dehydrating lactate and preparation and application thereof

A catalytic dehydration and catalyst technology, which is applied in the preparation of carboxylate esters, physical/chemical process catalysts, carboxylate preparations, etc., can solve the problems of retention, high cost, low selectivity and yield, etc., to prevent degradation, The effect of improving the yield and making the preparation method simple

Inactive Publication Date: 2010-08-25
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Usual lactate catalyzed dehydration catalysts are easy to catalyze degradation reactions such as decarboxylation and decarbonylation, and the selectivity and yield of the obtained target product acrylic acid and acrylate (hereinafter referred to as the total selectivity and total yield of acrylate) are not very high. ; and the cost of the reaction route with high yield is too high
So far, there is no production process route with high enough commercial value, and the catalytic dehydration of lactic acid and lactate to prepare acrylic acid and acrylate is still in the laboratory research stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 50.0g silica gel (specific surface area 100m 2 / g), put it into a dry round bottom flask, and add 200ml of toluene therein, slowly add 20ml of methyltriethoxysilane dropwise under stirring, continue to stir for a while, heat to reflux for 12h, and extract with toluene and acetone respectively and dried under vacuum at 60°C for 20 h to obtain hydrophobically modified silica gel.

[0029] 2.08g LiH 2 PO 4 Prepare 20ml of aqueous solution, impregnate 30g of hydrophobic modified silica gel, let it stand for 12h, dry at 100°C, burn at 600°C for 4h under the protection of nitrogen, press into tablets, and sieve to obtain LiH 2 PO 4 0.67mmol / g hydrophobically modified silica gel supported sodium dihydrogen phosphate catalyst.

[0030] In the normal pressure fixed-bed reactor (φ10×500mm), load 10ml of the above-mentioned catalyst of 20-30 meshes, the upper and lower parts of the catalyst are each filled with 10ml of quartz sand, and the upper part of the quartz sand i...

Embodiment 2

[0033] Weigh 50.0g silica gel (specific surface area 300m 2 / g), put into a dry round bottom flask, and add 100ml of toluene therein, slowly add 60ml of vinyltrichlorosilane dropwise under stirring, continue to stir for a while, heat to reflux for 48h, extract with toluene and acetone respectively, Vacuum drying at 100°C for 24 hours to prepare hydrophobically modified silica gel.

[0034] 7.95g NaH 2 PO 4 2H 2 O was made into 20ml aqueous solution, impregnated with 30g of hydrophobically modified silica gel, left to stand for 24h, dried at 110°C, roasted at 450°C for 6h under the protection of nitrogen, pressed into tablets, and sieved to obtain a hydrophobically modified silica gel containing NaH2PO4 of 1.7mmol / g Sodium dihydrogen phosphate catalyst.

[0035] In the normal pressure fixed-bed reactor (φ10×500mm), load 10ml of the above-mentioned catalyst of 20-30 meshes, the upper and lower parts of the catalyst are each filled with 10ml of quartz sand, and the upper part...

Embodiment 3

[0038] Weigh 50.0g of silica gel (specific surface area 280m 2 / g), put it into a dry round bottom flask, and add 100ml cyclohexane to it, slowly add 40ml hexamethylethylsilazane dropwise under stirring, continue to stir for a while, heat to reflux for 36h, and use toluene respectively Extract with acetone and dry in vacuum at 60°C for 20 hours to obtain hydrophobically modified silica gel.

[0039] 6.94g KH 2 PO 4 Prepare 20ml of aqueous solution, impregnate 30g of the silica gel prepared above, let stand for 24h, dry at 100°C, bake at 500°C for 5h under the protection of nitrogen, press into tablets, and sieve to obtain KH-containing 2 PO 4 Hydrophobic modified silica gel supported potassium dihydrogen phosphate catalyst of 1.7mmol / g.

[0040] In the normal pressure fixed-bed reactor (φ10×500mm), load 10ml of the above-mentioned catalyst of 20-30 meshes, the upper and lower parts of the catalyst are each filled with 10ml of quartz sand, and the upper part of the quartz s...

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Abstract

The invention discloses a catalyst for catalyzing and dehydrating lactate and preparation and application thereof. The catalyst consists of alkali metal dihydric phosphate, grafted hydrophobic group and silica gel. The method for preparing the catalyst comprises the following steps of: grafting the hydrophobic group on the organosilane onto the surface of the silica gel by adopting a grafting method; impregnating the silica gel in aqueous solution of alkali metal dihydric phosphate; and preparing the hydrophobically modified silica-supportedalkali metal dihydric phosphate catalysts through roasting. The catalyst is used for catalyzing and dehydrating the lactate to prepare acrylic acid and acrylic ester. The catalyst makes the lactate highly selectively synthesize the acrylic ester, and can simplify process flow and reduce production cost and consumption of petroleum resources.

Description

technical field [0001] The invention relates to a catalyst for catalytic dehydration of lactate and its preparation and application, in particular to a catalyst for synthesizing acrylic acid and acrylate by catalytic dehydration of lactate and its preparation and application. Background technique [0002] The continuous rise in oil prices, the depletion of disposable energy sources, and the survival crisis brought about by environmental degradation have made people focus on renewable resources again. Among them, biomass resources have become the focus of attention due to their efficient use of modern technology. The current production process of acrylic acid and acrylate is: petroleum → propylene → acrylic acid → acrylate, and the initial raw material comes from petroleum. Petroleum, as a non-renewable resource, will inevitably be exhausted in the foreseeable future, but the market demand for acrylic acid and acrylic acid esters continues to rise. Therefore, it is an inevit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/182C07C69/54C07C67/327C07C57/065C07C51/377
Inventor 张志强
Owner TAIYUAN UNIV OF TECH
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