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A kind of preparation method of aldehyde gas-phase hydrogenation catalyst

A catalyst and aldehyde gas technology, applied in the preparation of organic compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of difficult subsequent procedures, poor tolerance of butyraldehyde, low selectivity, etc., and improve molecular type selection. Effect, high strength and liquid resistance, effect of improving reaction effect

Active Publication Date: 2018-04-24
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Cu is used as a catalyst in the gas phase reaction because Cu has a good hydrogenation effect, but the Cu catalyst has poor liquid resistance, and it will be crushed and pulverized when encountering a liquid solution, and the reactor will be blocked due to catalyst pulverization, resulting in a bed pressure drop Larger, the phenomenon that the device cannot operate normally occurs from time to time
At the same time, due to incomplete gasification of raw materials, liquid will accumulate in the catalyst bed, which will not only fail to completely convert aldehydes, but also cause difficulties in subsequent processes, and also pose a huge challenge to the service life of catalysts.
[0010] The pore distribution of the butanol catalyst prepared by the current commercial precipitation method is relatively uneven, the content of butyl butyrate is relatively high, the selectivity is low, and the tolerance to incompletely gasified butyraldehyde is poor, which easily leads to a decrease in the use strength
On the other hand, the catalytic active components prepared by the conventional preparation method have poor dispersion and the conversion rate of butyraldehyde is not high

Method used

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  • A kind of preparation method of aldehyde gas-phase hydrogenation catalyst
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Examples

Experimental program
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Effect test

Embodiment 1

[0048] Place 3.5g of copper ingots, 6.2g of zinc ingots and 0.3g of aluminum ingots in a constant-temperature melting furnace, raise the temperature of the reaction furnace to 800°C, stir at a constant temperature for 3 hours, then raise the temperature of the reaction furnace to 1200°C, and stir at a constant temperature for 1 hour to produce to obtain molten metal. The molten metal is poured into ice water and rapidly cooled to form a metal alloy. After complete cooling, it is crushed and sieved to obtain alloy seeds with an average particle size of 200 μm and an average pore size of 1 nm.

[0049] Dissolve 17.62g of CTAB and 8.81g of PEG-6000 in the oil-water mixture, the oil-water mixture is 500g of petroleum ether and 500g of water respectively. After the surfactant is dissolved, add 0.65 g of copper-zinc-aluminum alloy seed crystals, add the oil-water mixed phase into the reciprocating reactor, and raise the temperature to 60°C. 137.41g copper nitrate (Cu(NO 3 ) 2 .3H...

Embodiment 2

[0054] Place 4.0g of copper ingots, 5.5g of zinc ingots and 0.5g of aluminum ingots in a constant temperature melting furnace, raise the temperature of the reaction furnace to 850°C, stir at a constant temperature for 3 hours, then raise the temperature of the reaction furnace to 1300°C, and stir at a constant temperature for 2 hours to prepare to obtain molten metal. The molten metal is poured into ice water and rapidly cooled to form a metal alloy. After complete cooling, it is crushed and sieved to obtain alloy seeds with an average particle size of 100 μm. The average pore size of the seed crystals is 5 nm.

[0055] Dissolve 16.03g of CTAB and 16.03g of PEG-6000 in the oil-water mixture. The oil-water mixture is 333g of petroleum ether and 667g of water. After the surfactant is dissolved, 0.98 g of copper-zinc-aluminum alloy seed crystals are added, and the oil-water mixed phase is added to a plug flow reciprocating reactor, and the temperature is raised to 70°C. Dissolv...

Embodiment 3

[0060] Place 4.5g of copper ingots, 5.4g of zinc ingots and 0.1g of aluminum ingots in a constant temperature melting furnace, raise the temperature of the reaction furnace to 750°C, stir at a constant temperature for 1 hour, then raise the temperature of the reaction furnace to 1400°C, and stir at a constant temperature for 3 hours to produce to obtain molten metal. The molten metal is poured into ice water, the metal solution is rapidly cooled to form a metal alloy, and after complete cooling, it is crushed and sieved to obtain alloy seeds with an average particle size of 50 μm. The average pore size of the seed crystals is 10 nm.

[0061]Dissolve 10.55g of CTAB and 10.55g of PEG-6000 in the oil-water mixture, the oil-water mixture is 400g petroleum ether and 600g water respectively. After the surfactant is dissolved, 0.65 g of copper-zinc-aluminum alloy seed crystals are added, and the oil-water mixed phase is added to a plug flow reciprocating reactor, and the temperature...

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Abstract

The invention relates to a preparation method of an aldehyde gas phase hydrogenation catalyst. The method comprises the following steps: (1) preparing copper-zinc-aluminum alloy seed crystals with an average pore diameter of 1-10 nm and a particle size of 50-200 μm; (2) adding copper-zinc-aluminum alloy seed crystals and surfactants to the oil-water two-phase solution and introduced into the reciprocating reactor, copper, zinc, aluminum salt solution and precipitant solution are titrated into the two-phase solution through two feed ports, and the precipitation and aging are obtained to obtain the precipitation solution; (3) the precipitation solution is divided into After layering, take the water phase, filter, wash, dry, and roast to obtain the catalyst. The catalyst prepared by the method has the advantages of high activity, large specific surface area, small pore diameter and concentrated distribution, which improves the selectivity of alcohol, and meanwhile, the catalyst has higher strength and liquid resistance.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of an aldehyde gas-phase hydrogenation catalyst. Background technique [0002] Butanol is a colorless liquid with an alcohol smell. It is a solvent for various coatings and a raw material for the plasticizer dimethyl phthalate. It is also used to manufacture butyl acrylate, butyl acetate, and butyl oxalate. Ether is also used as an organic synthesis intermediate and an extractant for biochemical drugs, and is also used to make surfactants. Its industrial production methods include acetaldehyde aldol condensation method, fermentation method and propylene carbonyl synthesis method. In addition, part of n-butanol can also be by-produced when higher fatty alcohols are produced from ethylene. [0003] Aldol condensation of acetaldehyde to butanol mainly produces crotonaldehyde by condensation and dehydration of two molecules of acetaldehyde, and cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80B01J35/10C07C29/141C07C31/12
CPCC07C29/141B01J23/80B01J35/613B01J35/633B01J35/647C07C31/12
Inventor 詹吉山于海波李作金崔娇英孟祥南尹育初乃波姜庆梅黎源
Owner WANHUA CHEM GRP CO LTD