Contact masses processing method during methylchlorosilane synthesis

A technology of methylchlorosilane and dimethyldichlorosilane is applied in the field of treatment and recovery of contact bodies in the synthesis process of methylchlorosilane, and can solve the problem of affecting the effective production time of a methylchlorosilane device, affecting the economic benefits of enterprises, and reducing silicon dioxide. And copper waste and other problems, to increase the effective production time, improve the economic benefits of enterprises, selectivity and stability.

Active Publication Date: 2011-05-11
ZHENJIANG JIANGNAN CHEM
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Problems solved by technology

Equipment maintenance greatly affects the effective production time of the methyl chlorosilane plant, which in turn affects the economic benefits of the enterprise
In addition, because the average particle size of waste contacts is small and contains highly active copper, on the one hand, it can cause oxidation or even combustion when exposed to the air. If it is not handled properly in time, it will cause serious pollution to the environment and pose a safety hazard; On the other hand, it causes great waste of silicon and copper

Method used

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  • Contact masses processing method during methylchlorosilane synthesis

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Effect test

Embodiment 1

[0018] 42 tons (t) of silicon powder and copper powder (silicon powder: copper powder = 20:1, which is the weight ratio) active contacts, pre-added to the fluidized bed, reacted after being fluidized by methyl chloride, the reaction temperature is 280 ° C, the reaction The pressure is 0.3Mpa, and the gas velocity is 0.20m / s. The gas phase reaction product is discharged from the synthesis gas outlet. As the bed height decreases, the active contacts and co-catalysts are continuously supplemented during the reaction. The co-catalyst is a mixture of zinc powder, antimony and aluminum powder. The powder ratio is 3:2:2, 800kg in total. When the selectivity of M2 in the synthesis gas is reduced to 80% (that is, the reaction lasts for 25 days), suspend the addition of the contact body, pressurize the contact body in the fluidized bed with nitrogen gas, and press out the contact body in the storage tank, the contact body is about 53.4t , The silicon powder collected by the cyclone sep...

Embodiment 2

[0021] 46 tons (t) of silicon powder and copper powder (silicon powder: copper powder = 22:1) are active contacts, which are added to the fluidized bed in advance and reacted after being fluidized by methyl chloride. The reaction temperature is 300°C and the reaction pressure is 0.3Mpa. , the gas velocity is 0.18m / s. The gas phase reaction product is discharged from the synthesis gas outlet. As the bed height decreases, the ratio of fresh silicon powder, copper catalyst and cocatalyst zinc powder, antimony and aluminum powder to the mixture is continuously replenished during the reaction. The ratio is 2:1: 1 total 750kg, when the selectivity of M2 in the synthesis gas was reduced to 79% (i.e., reacted for 25 days), suspend adding the contact body, pressurize the contact body in the fluidized bed with nitrogen to press out in the storage tank, contact The volume is about 52.7t, and the silicon powder collected by the cyclone separator during the reaction is 40.8t, which is seal...

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Abstract

The invention relates to the field of organic chemistry, in particular to a method for processing and recovering contacts in the synthetic process of methyl chlorosilane, which is characterized by comprising the following steps: adding an intermediate storage tank of the contacts in the process of synthesizing the methyl chlorosilane; when the selectivity of a target product is reduced to between70 and 90 percent, transferring the contacts in the reaction system to the intermediate storage tank; re-adding new contacts to react in a fluidized bed, and mixing the transferred contacts with fresh silicon powder; and returning the mixture to the fluidized bed to use the mixture as new contacts to be added to the reaction. In the invention, the production method is used to not only ensure the stability of the selectivity for dimethyl dichlorosilane in the synthetic process of the methyl chlorosilane, and prolong the synthetic cycle of organochlorosilane simultaneously. The effective production time of the production device can be up to over 50 days.

Description

technical field [0001] The invention relates to the field of organic chemistry, in particular to a method for treating and recovering contacts in the synthesis process of methylchlorosilane. Background technique [0002] Methylchlorosilane is the most important intermediate raw material for the preparation of silicone polymers, and also the basic raw material for the preparation of other silicon-functional silanes. Among them, the consumption of dimethyldichlorosilane (M2) is the largest, accounting for about 90% of methylchlorosilane. Therefore, organic silicon manufacturers at home and abroad use the selectivity of dimethyldichlorosilane as an assessment index for the synthesis efficiency, and at the same time, the length of the synthesis cycle is also reduced to a certain level by the selectivity of dimethyldichlorosilane. Measured by the extent, under the premise of ensuring a high selectivity of M2, the longer the synthesis production cycle, the higher the level of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/16B01J8/18
Inventor 朱德洪罗斯格杨捷祝纪才黄俊朱恩俊
Owner ZHENJIANG JIANGNAN CHEM
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