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); therefore, when choosing the position where the two reactants are introduced into the tower, the low-boiling point substances are on the upper side, and the high-boiling point substances are on the bottom. Principle: After the two reactants react in the reaction section 105, it is convenient for the low boiling point substance to enter the rectifying section 104, and the high boiling point substance methanol is convenient for entering the stripping section 106 together with the product tetramethoxysilane. Therefore, in this embodiment, preferably, the silicon tetrachloride inlet 107 and the methanol inlet 108 are arranged from top to bottom. For details, please refer to figure 1 . ...
Embodiment 3
[0049] Please refer to figure 1 , on the basis of Example 2, preferably, the cooling temperature of the column top condenser 103 is not higher than -86°C (the boiling point temperature of hydrogen chloride under normal pressure);
[0050] Because in the rectification stage, mainly silicon tetrachloride and the generated by-product hydrogen chloride gas flow to the top of the tower, so, in the process of cooling, the cooling temperature of the tower top condenser 103 should not be higher than -86 ℃; All the gas is condensed into liquid, and after stable operation, part of the hydrogen chloride liquid is collected as a by-product, and part of it is refluxed into the tower to continue mass transfer. In addition, in a more preferred embodiment, the two kinds of reactants entering the tower are pressurized, there is a large pressure in the tower, and the boiling points of all substances in the tower will rise, and then the tower overhead condenser is convenient. 103 and the reboil...
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Abstract
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