Device and method for preparing tetramethoxysilane
A technology of tetramethoxysilane and silicon tetrachloride, which is applied in chemical instruments and methods, silicon organic compounds, sustainable manufacturing/processing, etc., can solve problems such as unstable product quality, large investment in equipment, and complicated processes. Achieve the effect of saving the rectification and purification section, reducing equipment investment and simplifying the operation process
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Embodiment 1
[0039] Please refer to figure 1 , the embodiment of the present invention provides a device for preparing tetramethoxysilane, including a reactive distillation column 101, a reboiler 102 and a top condenser 103; Rectification section 104, reaction section 105 and stripping section 106, methanol inlet 108 and silicon tetrachloride inlet 107 are provided on the outer wall where said reaction section 105 is located; the bottom of said reactive rectification tower 101 is provided with Outlet 111 at the bottom of the tower, and the outlet at the bottom of the tower 111 is provided with a liquid outlet pipe 112; , the other end communicates with the stripping section 106; the overhead condenser 103 is arranged on the top of the reactive distillation column 101, one end communicates with the top outlet 109 of the reactive distillation column 101, and the other end is connected to There is an overhead product recovery pipe and a liquid return pipe 110 communicating with said rectific...
Embodiment 2
[0043] Please refer to figure 1 , On the basis of Example 1, preferably, the silicon tetrachloride inlet 107 and the methanol inlet 108 are arranged from top to bottom;
[0044] Since the boiling point of silicon tetrachloride is 57.6°C, which is lower than the boiling point of methanol (64.7°C); so when selecting the position where the two reactants are passed into the tower, follow the principle that the low boiling point substance is on the top and the high boiling point substance is on the bottom Principle: after the reaction of the two reactants in the reaction section 105, the low-boiling substance enters the rectifying section 104, and the high-boiling substance methanol enters the stripping section 106 together with the product tetramethoxysilane. Therefore, in this embodiment, preferably, silicon tetrachloride inlet 107 and methanol inlet 108 are arranged from top to bottom, please refer to figure 1 .
[0045] Further, the rectification section 104 and the stripping...
Embodiment 3
[0049] Please refer to figure 1 , On the basis of Example 2, preferably, the cooling temperature of the top condenser 103 is not higher than -86°C (the boiling point of hydrogen chloride under normal pressure);
[0050] Since in the rectifying stage, mainly silicon tetrachloride and the by-product hydrogen chloride gas flow to the top of the tower, so, in the process of cooling, the cooling temperature of the top condenser 103 should not be higher than -86°C; All the gas is condensed into liquid. After stable operation, part of the hydrogen chloride liquid is collected as a by-product, and part of it is returned to the tower to continue mass transfer. In addition, in a more preferred embodiment, the two reactants entering the tower are pressurized, and there is a relatively high pressure in the tower, and the boiling points of all substances in the tower will increase, thereby facilitating the cooling of the top condenser. 103 and the reboiler 102 can respectively realize the...
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Abstract
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