Catalyst for producing crotonaldehyde

A catalyst and crotonaldehyde technology, applied in the direction of molecular sieve catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problem of high conversion rate and high selectivity, low conversion rate of crotonaldehyde selectivity, and limit the development of crotonaldehyde and other issues, to achieve the effect of improving conversion rate and selectivity, environmental friendliness, and reducing the amount of waste water

Inactive Publication Date: 2009-06-24
SINOPEC YANGZI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above literature that the reaction temperature of acetaldehyde gas phase condensation reaction on silica-supported alkali metal and alkali metal exchanged molecular sieve catalysts is relatively high, and the conversion rate and crotonaldehyde selectivity are low, especially difficult to achieve high simultaneously. Conversion and high selectivity
Although hydrotalcite-like catalysts also obtain higher selectivity at higher conversion rates, the reaction pressure is higher, which limits the development of the technology to produce crotonaldehyde by this process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0021] Weigh mlg of the alkali metal oxide precursor and dissolve it in distilled water with a mass concentration of 15%. Weigh m2g alkaline earth metal oxide precursor and m3g Al 2 o 3 , was added to the aqueous solution of the alkali metal precursor, stirred at room temperature for 5 hours, then stood still for 12 hours, and dried at 100° C. to constant weight. After grinding, add 15% of the total mass of cyanide powder and mix evenly, then add 20% of the total mass of silica sol, mix evenly, extrude on a catalyst molding machine, and then calcinate in a muffle furnace at 550°C for 4 hours , the cooled catalyst is crushed and sieved, and the 20-40 mesh catalyst is taken and put into a desiccator for standby. The preparation conditions of several catalysts are shown in Table 1.

[0022] Table 1

[0023] catalyst

[0024] 1 KOH 1.2 MgO 95.2 4.8 2 NaNO 3 8.2 MgO 25.0 75.0 3 KF 6.2 Mg(OH) 2 120.8 16.7 4 Cs 2 CO 3 11....

Embodiment 7～12

[0026] Take 20 g of the catalysts in Examples 1-6 and put them into a fixed-bed reactor. Under normal pressure and reaction temperature 300°C, with N 2 As a carrier gas, acetaldehyde is fed at a certain mass space velocity, and the obtained reaction product is analyzed by gas chromatography, and the conversion rate of acetaldehyde, the selectivity of crotonaldehyde and the selectivity of the main by-product tolualdehyde are calculated. The reaction results are shown in Table 2.

[0027] Table 2

[0028] catalyst

Embodiment 13～16

[0030] Weigh m1g of the alkali metal oxide precursor and dissolve it in distilled water with a mass concentration of 5%. Weigh m2 grams of alkaline earth metal oxide precursors and m3 grams of molecular sieves, add them into the aqueous solution of alkali metal oxide precursors, stir at room temperature for 5 hours, then let stand for 12 hours, and dry at 100°C to constant weight. After grinding, add 20% of the total mass of cyanide powder and mix evenly, then add 20% of the total mass of silica sol, after mixing evenly, extrude on a catalyst molding machine, and then calcinate in a muffle furnace at 550°C for 4 hours , the cooled catalyst is crushed, sieved, and the 20-40 mesh catalyst is taken and put into a desiccator for later use. The preparation conditions of several catalysts are shown in Table 3.

[0031] table 3

[0032] catalyst

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PUM

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Abstract

The invention provides a catalyst for producing crotonaldehyde, which takes a complex consisting of alkaline earth metal oxide and a molecular sieve or alumina as a carrier, and is prepared by supporting alkaline metal oxide by adopting an impregnation method. Alkaline earth metal is magnesium, calcium or barium, the molecular sieve is an HZSM-5, Hbeta, HY, USY or rare earth Y(ReY) molecular sieve, the alumina is gamma-Al2O3, and alkaline metal is lithium, sodium, potassium or cesium. The mass ratio of the alkaline earth metal oxide and the molecular sieve or the alumina which are taken as the carrier of the catalyst is 1: 20-20: 1, and the mass of the alkaline metal oxide is 1 to 30 percent of the total mass of the complex consisting of the alkaline earth metal oxide and the molecular sieve or the alumina. Compared with a solid catalyst reported by literature, the catalyst has better low-temperature activity, namely the reaction temperature is lower than that of the catalyst reported by literature when the conversion rate of acetaldehyde is equivalent to the selectivity of the crotonaldehyde. The method also additionally produces tolyl aldehyde with higher added value when synthesizing a main product, namely the crotonaldehyde, and further promotes the economic benefit of the catalyst.

Description

technical field [0001] The invention relates to a catalyst for producing crotonaldehyde. Background technique [0002] Crotonaldehyde, also known as 2-butenal, 3-methacrolein. Crotonaldehyde is an important organic chemical intermediate, which is widely used in the fields of food, resin, binder and dyestuff. Crotonaldehyde reacts with ketene to synthesize sorbic acid (potassium), an efficient and low-toxic food preservative, reacts with butadiene to obtain epoxy resin raw materials and epoxy plasticizers, and reacts with pentaerythritol to obtain heat-resistant resin raw materials. Crotonaldehyde can be oxidized to produce crotonic acid, and its copolymer is used as a binder in papermaking, medicine and textile industries. Crotonaldehyde can also be used to synthesize asphalt additives with ethylenediamine, and lubricating oil viscosity index improvers with nitrogen-containing organic compounds. [0003] At present, the industrial production of crotonaldehyde generally ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/04B01J29/40B01J29/08B01J29/70B01J37/02C07C47/22C07C45/74C07C47/542
Inventor 乔旭王振新汤吉海崔咪芬鲁小俊陈献赵宝明
Owner SINOPEC YANGZI PETROCHEM
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