Академия наук республики узбекистан



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Bog'liq
polikristall kremnij olishning monosilanli texnologiyasi va kremnij strukturalarini yaratishning ionli stimullashgan usullari

 
 
Figure 1.1. A scheme of the process of triethoxysilane synthesis by direct reaction of 
metallurgical silicon and ethanol 
The alkoxysilane synthesis technology includes the following processes: 
preparation of technical silicon and catalyst, preparation of 
absolute 
alcohol, the 
104 


direct reaction of silicon and ethanol in the presence of a catalyst to synthesize 
ethoxysilanes, separation
of alkoxysilanes.
In general, a new solution is that the process of silicon and catalyst 
milling up 
to a size of particles 30-100 micrometers is performed in 
a protective environment, 
namely in a solvent medium, in our case Terminol 66. Milling
is performed with a 
planetary ball mill. Further, a suspension with silicon and catalyst in predetermined 
proportions feds 
into the reaction chamber. There is a homogeni
zer in the scheme 
of triethoxysilane (TES) synthesis
to stabilize the composition and mechanically 
activate a mixture of catalyst and silicon
. Dosing suspension feed into the reactor is 
realized with a peristaltic pump. 
The reactor is equipped with a four
-
tier blade mixer with the speed of 
rotation up to 1000 rpm, electric heating up to 260
о
C, and inlets for suspension and 
absolute alcohol feeding. The reactor is also equipped with flanges where the 
membrane filter for removal of extra solvent with impuriti
es is 
mounted. The filter 
is 
the ceramic disk with the average sizes of pores about 5 µm. Filtration is made 
by the difference of pressures created by a vacuum pump. These solutions allowed 
excluding the induction period of the reaction of triethoxysilane synthesis. The 
copper monochloride CuCl was used as a catalyst.

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