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Pretreatment method for disproportionating silane catalyst

A disproportionated silane and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of reduced catalytic activity, low purity, and reaction product pollution, etc., to improve the primary conversion rate , increase the activation process, and solve the effect of re-pollution

Active Publication Date: 2011-04-27
潜江宜生新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the technical problems of existing catalysts that easily lead to reaction product pollution, low purity, and reduce the catalytic activity of the catalyst, a catalyst pretreatment method is provided

Method used

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  • Pretreatment method for disproportionating silane catalyst
  • Pretreatment method for disproportionating silane catalyst
  • Pretreatment method for disproportionating silane catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Soak the resin-type D301 catalyst with 5% HCl aqueous solution at a ratio of 1:5 for 12 hours, then filter the aqueous solution, and wash it with deionized water twice; then use 5% NaOH aqueous solution at a solid-liquid ratio of 1 Soak in the ratio of : 5 for 12h, then filter the aqueous solution, and wash 3 times with secondary deionized water.

[0038] Mix the wet catalyst with acetone at a solid-to-liquid ratio of 1:5, soak it for 12 hours under slow stirring, replace the moisture in the catalyst with an organic solvent, replace the fresh organic solvent with the same method for 3 times, and then The solvent was filtered off, and then the catalyst was purged with nitrogen gas at a temperature of 50°C to take away the organic solvent.

[0039] Before carrying out the reaction of disproportionated silane, further activation treatment was added in this example to improve the activity of the catalyst. In this example, the activation treatment is also carried out in the ...

Embodiment 2

[0042] Load the self-made activated carbon-based Co / C catalyst into the ion exchange column, and then use 10% HCl aqueous solution, secondary deionized water, 10% NaOH aqueous solution, and secondary deionized water to pass through the ion exchange column continuously by means of pressure. Columns to remove catalyst impurities, respectively, through the time of 12h.

[0043] Mix the washed catalyst with ethanol at a solid-to-liquid ratio of 1:4, soak it for 12 hours under slow stirring, replace the water in the catalyst with an organic solvent, replace it with a fresh organic solvent, and use the same method for 3 times, then filter out Solvent, then purging the catalyst with nitrogen gas at a temperature of 50°C for 24h to take away the organic solvent. Before using the catalyst, dry 5N grade HCl gas was continuously passed through the catalyst at 40°C for 12h, and then the catalyst was purged with nitrogen or inert gas for 12h.

[0044] After the above treatment of the cata...

Embodiment 3

[0046] The self-made activated carbon-based Co / Si-Al catalyst supported catalyst was soaked in 10% HCl aqueous solution for 24 hours, then filtered and washed with water; then soaked in 10% NaOH aqueous solution for 24 hours, then filtered and washed with water. Transfer the catalyst that is still wet after washing with water to the reaction kettle, as shown in the figure, fill the organic solvent ethanol in A2, heat the solvent storage tank at A2, make the boiling solvent enter from the bottom of A1 and pass through the catalyst, and condense and recover in the condenser on the upper part of A1 It flows into the storage tank A2, and is continuously heated and refluxed for 12 hours, and then replaced with a fresh organic solution for 2 heating and reflux operations. Then the catalyst 24 is purged with helium gas at a temperature of 50° C. to filter out the organic solvent.

[0047] Before using the catalyst, dry 5N grade HCl gas was continuously passed through the catalyst at ...

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Abstract

The invention provides a pretreatment method of a catalyst, aiming at solving the technical problems that the existing catalyst is easy to cause pollution of reaction products, the purity is lower and the catalytic activity of the catalyst is reduced simultaneously. The pretreatment method is as follows: firstly removing the impurities in the catalyst; then using an organic solvent to replace and remove water content in the catalyst; and finally volatilizing the organic solvent, and carrying out activation before the catalyst is used. By utilizing the pretreatment method, the decomposition of products and corrosion of equipment caused by the impurities and water left in the catalyst are prevented. Simultaneously, the problem of recontamination in the transfer process after the catalyst is treated is solved, the activation technology of the catalyst is improved, the activation of the catalyst is further improved while treating the catalyst and the primary conversion rate of products is improved.

Description

technical field [0001] The invention belongs to the field of disproportionation of chlorosilanes, in particular to the field of using catalysts for disproportionation to prepare silanes. Background technique [0002] Silane, also known as monosilane, silicon tetrahydrogen, molecular formula SiH 4 , SiH 4 It is a strong reducing substance, and it will show strong activity when it contacts with oxidizing substances, alkalis or multi-metal salt solutions. It is a flammable and explosive dangerous gas. Silane is the basic raw material for the production of a series of silicon compounds such as monocrystalline silicon, polycrystalline silicon, amorphous silicon, metal silicide, silicon nitride, silicon carbide, and silicon oxide, and is widely used in the electronics and semiconductor industries. [0003] Now the commonly used silane preparation method is to use silicon tetrachloride as raw material, including hydrogenation, disproportionation, thermal decomposition, hydrogen r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/00C01B33/04
Inventor 丁显波周勇姜占锋
Owner 潜江宜生新材料有限公司
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