Method for continuously rectifying 3-chloropropyl triethoxysilane

Abstract

The invention provides a method for continuously rectifying 3-chloropropyl triethoxysilane, belonging to the field of chemical engineering separation. The device is characterized by comprising an ethanol rectifying separating device and a 3-chloropropyl triethoxysilane rectifying separating device which are structured the same and connected in series by a conveying pipeline and a material transforming pump, wherein each of the two rectifying separating devices which are structured the same comprises a rectifying tower, a condenser and a finished product storage tank which are connected with the top of the rectifying tower by a reflux pipeline, a condenser and a crude product storage tank which are connected with the bottom of the rectifying tower by the conveying pipeline. The crude product storage tank is connected with a next group of a rectifying separating device by the material transforming pump. In the first tower, ethanol is removed at normal pressure to reach a purity of more than 99.8%; in the second tower, 3-chloropropyl triethoxysilane is removed by rectifying at a negative pressure of -0.0098Mpa to reach a purity of more than 99.5%.

Description

technical field [0001] The invention belongs to the field of chemical separation, and in particular relates to a continuous rectification method of 3-chloropropyltriethoxysilane. Background technique [0002] Rectification is one of the most important units in the production process of chemical industry and other industries. It is an important means for raw material purification, product refining, solvent and waste recycling, and also a key technology for energy saving and emission reduction. The research on rectification technology in my country has approached or reached the international advanced level, and many advanced technologies have also been applied in large-scale chemical industry, but the rectification technology used in petrochemical industry consumes a lot of energy; the technology used in organic / fine chemical production Most of the advanced distillation techniques are primitive and low-tech. [0003] The current production process of 3-chloropropyltriethoxysil...

AI Technical Summary

Problems solved by technology

The rectification of the existing 3-chloropropyltriethoxysilane is a traditional batch rectification process, which mainly has the following disadvantages: during the batch rectification, the whole tower is a rectification section, and there is no stripping section, which requires high operating precision. It has a great impact on product quality; the feed liquid is heated in the kettle for too long during intermittent rectification, resulting in too much residue in the 3-chloropropyltriethoxysilane rectification kettle, low rectification yield, high consumption and high cost; intermittent rectification Low distillation output, low efficiency of the tower, high energy consumption, and the production of three wastes after each batch of rectification

[0004] Although, in theory, the mixture of 3-chloropropyltriethoxysilane and ethanol can be separated by a single-tower continuous rectification process to obtain a higher-precision rectification product, but due to the need to separate A variety of substances, any temperature change at the top of the tower, at the bottom of the tower or at the side of the tower will have a significant impact on the purity of the whole tower distillation, and the operability is low

In actual production, since it is difficult to control the temperature and pressure changes at the top, bottom and side of the tower at the same time in the continuous rectification of a single column, the actual precision of the rectified product is not ideal

Single-column continuous distillation cannot separate one substance in the mixture

When the mixed liquid is composed of three or more organic substances, single-column continuous distillation cannot separate one substance from the mixed liquid, and its flexibility is low

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