A Halogen-Free Silane Method for Preparation of Solar Grade Silicon
A solar-grade, halosilane-based technology, which is applied in the fields of inorganic chemistry, silicon compounds, chemical instruments and methods, etc., can solve the problem that the specific components of the catalyst and the reaction conditions are not clearly stated, the chemical reaction formula is not given, and the application cannot be filed. Obtain authorization and other issues to achieve social and economic benefits, improve safety, and eliminate pollution
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Embodiment 1
[0054] Step (1) The chemically pure industrial silicon with a purity ≥ 99.00% and a particle size of 40 μm and the nano-scale copper hydroxide with a purity of more than 99.5% are subjected to high-temperature drying at 150°C for 5 hours and microwave irradiation for 15 minutes to activate the pretreatment, Then put it into the dodecylbenzene solution at 20°C, and then pass through the solution successively with water content -4 Analyze pure methanol and potassium nitrate with a purity ≥ 99.5%, make it react as follows to generate 99% trimethoxysilane and 1% tetramethoxysilane, and use distillation to separate tetramethoxysilane to obtain trimethoxysilane Silane:
[0055]
[0056]
[0057] Step (2) uses sodium nitrate solution as a catalyst to make trimethoxysilane undergo the following disproportionation reaction at 20°C to generate monosilane:
[0058]
[0059] Step (3) Use molecular sieves to absorb monosilane, then cool monosilane to -120°C in a liquid nitrogen ta...
Embodiment 2
[0067] Step (1) The chemically pure industrial silicon with a purity ≥ 99.30% and a particle size of 300 μm and the nano-scale copper hydroxide with a purity of more than 99.5% are subjected to high-temperature drying at 250° C. for 0.5 hours and microwave irradiation. Activate the pretreatment for 5 minutes, then put it into the dodecylbenzene solution at 120°C, and then pass through the solution with a water content of -4 Analyze pure methanol and sodium nitrate with a purity ≥ 99.5%, make it react as follows to generate ≥ 99% trimethoxysilane and ≤ 1% tetramethoxysilane, and use distillation to separate tetramethoxysilane to obtain pure Trimethoxysilane:
[0068]
[0069]
[0070] Step (2) uses potassium nitrate solution as a catalyst, and at 150° C., trimethoxysilane undergoes the following disproportionation reaction to generate monosilane:
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[0072] Step (3) Use activated carbon as an adsorbent to absorb monosilane, and then cool monosilane to -130°C in ...
Embodiment 3
[0079] Step (1) The chemically pure industrial silicon with a purity ≥ 99.68% and a particle size of 150 μm and the nano-scale copper hydroxide with a purity of more than 99.5% are subjected to high-temperature drying at 150° C. for 2.5 hours and microwave irradiation. Activate the pretreatment for 5 minutes, then put it into the alkyl biphenyl type heat transfer oil at 250°C, and then pass through the solution with water content -4 Analyze pure methanol and potassium nitrate with a purity ≥ 99.5%, make it react as follows to generate 99% trimethoxysilane and 1% tetramethoxysilane, and use distillation to separate tetramethoxysilane to obtain trimethoxysilane Silane:
[0080]
[0081]
[0082] Step (2) uses calcium nitrate solution as a catalyst, and at 250° C., trimethoxysilane undergoes the following disproportionation reaction to generate monosilane:
[0083]
[0084] Step (3) Use molecular sieves to absorb monosilane, and then cool monosilane to -160°C in a liquid...
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