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Cs-supported silica-based catalyst and preparation method and application thereof

A catalyst, supported technology, applied in molecular sieve catalysts, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of high equipment requirements, easy corrosion, high price of propylene, etc., achieve simple preparation process, maintain catalytic activity, The effect of high catalytic activity

Inactive Publication Date: 2014-05-21
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above production methods have the following disadvantages: the first method uses strong acid, which is easy to corrode and has high requirements for equipment; with the continuous rise of international oil prices, the price of petrochemical product propylene also increases greatly, and the cost rises. The one-step oxidation requires high catalyst performance, which is not conducive to the production of the second method; the raw material ketene used in the third method is not easy to obtain, which limits the application
And this method requires many types of catalysts, large dosage, complex catalyst preparation process, resulting in increased process costs, which is not conducive to large-scale industrial production

Method used

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  • Cs-supported silica-based catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 0.7280g CsNO 3 Dissolve in 12ml of deionized water, and evenly impregnate the solution in 10g of 40-60 mesh SiO 2 Put it on, stir, let it stand for 1 hour, and evaporate excess water in a 60°C water bath. Transfer to a vacuum drying oven, dry at 50°C for 12 hours, and then bake at 450°C for 5 hours in an air atmosphere to prepare the catalyst 5 (wt%) Cs / SiO 2 .

[0036] In a fixed bed reactor, at 390°C, carrier gas flow 50ml / min, methyl acetate: formaldehyde: methanol molar ratio 1:2:2, space velocity 5h -1 , Feed volume 0.03ml / min, catalyst dosage is under the condition of 0.5000g, prepare methyl acrylate, the one-pass conversion rate of methyl acetate is 43.2%, the selectivity of methyl acrylate is 92.1%, the one-pass yield of methyl acrylate was 39.8%.

Embodiment 2

[0038] Weigh 0.7280g CsNO 3 Dissolve in 12ml of deionized water, dip the solution evenly on 10g of 40-60 mesh SBA-15, stir, let it stand for 1 hour, and evaporate excess water in a 60°C water bath. Transfer to a vacuum drying oven, dry at 50°C for 12 hours, and then bake at 450°C for 5 hours in an air atmosphere to prepare catalyst 5 (wt%) Cs / SBA-15.

[0039] In a fixed bed reactor, at 390°C, carrier gas flow 50ml / min, methyl acetate: formaldehyde: methanol molar ratio 1:2:2, space velocity 5h -1 , feed volume 0.03ml / min, catalyst dosage is under the condition of 0.5000g, prepare methyl acrylate, the one-pass conversion rate of methyl acetate is 48.4%, the selectivity of methyl acrylate is 95.0%, the one-pass yield of methyl acrylate was 46.0%.

Embodiment 3

[0041] Weigh 0.7280g CsNO 3 Dissolve in 12ml of deionized water, evenly impregnate the solution on 10g of 40-60 mesh silica prepared by the silica sol method, stir, let stand for 1 hour, and evaporate excess water in a 60°C water bath. Transfer to a vacuum drying oven, dry at 50°C for 12 hours, and then bake at 450°C for 5 hours in an air atmosphere to prepare catalyst 5 (wt%) Cs / Silica gel (silicon dioxide prepared by silica sol method).

[0042] In a fixed bed reactor, at 390°C, carrier gas flow 50ml / min, methyl acetate: formaldehyde: methanol molar ratio 1:2:2, space velocity 5h -1 , feed volume 0.03ml / min, catalyst dosage is under the condition of 0.5000g, prepare methyl acrylate, the one-pass conversion rate of methyl acetate is 28.9%, the selectivity of methyl acrylate is 94.8%, the one-pass yield of methyl acrylate was 27.4%.

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Abstract

The invention provides a Cs-supported silica-based catalyst. One of SBA-15, SiO2 or silicon dioxide prepared by a silica sol method is used as a carrier, the support is selected from one of Cs salt and a mixture of Cs and modified elements, the catalyst is prepared by a dipping method, the Cs content is 0.1wt%-10wt%, and the content of the modified elements is 0-2wt%. Meanwhile, the invention further provides a preparation method of the Cs-supported silica-based catalyst and application of the Cs-supported silica-based catalyst to the process of preparing methyl acrylate by catalyzing condensation reaction of methyl acetate and a methanal gas phase. The prepared catalyst is capable of realizing the aldol condensation of the methyl acetate and the methanal gas phase under proper conditions so as to prepare the methyl acrylate, wherein the activity of the Cs / SBA-15 catalyst is higher than that of other Cs-supported silica-based catalysts, and the selectivity on the methyl acrylate is good.

Description

technical field [0001] The invention relates to a Cs-loaded silicon-based catalyst and a preparation method thereof, as well as the application of catalyzing the gas-phase condensation reaction of methyl acetate and formaldehyde to prepare methyl acrylate. Background technique [0002] Methyl acrylate, molecular formula C 4 h 6 o 2 , a colorless liquid with a pungent smell, slightly soluble in water, soluble in ethanol and ether, is an important intermediate in organic synthesis and an organic monomer in polymer synthesis, widely used in the copolymerization of rubber, prepared with A new type of rubber with high temperature resistance and oil resistance; it can be copolymerized with methyl methacrylate and olefins to obtain high-performance coatings; it can be polymerized with acrylonitrile to improve the spinnability, dyeability and plasticization of polyacrylonitrile fibers; In addition, methyl acrylate also has applications in chemical fibers, leather, resins, coating...

Claims

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Application Information

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IPC IPC(8): B01J23/04B01J29/035C07C69/54C07C67/343
Inventor 王振旅颜见标张文祥张春雷唐勇宁春利张怡
Owner SHANGHAI HUAYI GRP CO
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