A rectification tower that can realize rapid temperature rise and vaporization of materials

Abstract

The invention discloses a rectification tower capable of realizing rapid temperature rise and vaporization of materials, which comprises a rectification tower body, a tower bottom heating kettle and an atomizer arranged inside the tower bottom heating kettle, and the rectification tower body is provided with a tower top The gas-rising port and the top reflux port, the interior of the rectification tower body are provided with fillers; the heating tank at the bottom of the tower is provided with a feed inlet and a discharge port at the bottom of the tank, and an electromagnetic coil is wound on the outer wall of the heating tank at the bottom of the tower. The two ends are connected with a temperature control circuit system; the atomizer is connected with the feed inlet pipeline on the heating tank at the bottom of the tower, and the side of the atomizer is provided with a spray port. The rectification tower of the present invention is especially suitable for rectification and separation of high-boiling point and heat-sensitive materials. During rectification, the materials are atomized, and the atomized liquid droplets are in direct contact with the heating surface, without generating a liquid layer thickness, and realizing high-vacuum vaporization of the materials. ;At the same time, it is heated and vaporized in the form of droplets, with high heat exchange efficiency, which can realize rapid heating and vaporization of materials, reduce the residence time of materials on high-temperature surfaces, and prevent denaturation and coking of materials.

Description

technical field [0001] The invention belongs to the technical field of rectification, and in particular relates to a rectification tower capable of rapidly raising the temperature and vaporizing materials. Background technique [0002] In the chemical production process, high-boiling point and heat-sensitive materials are usually separated by high-vacuum rectification, and the operating pressure is usually less than 1000Pa. In the high-vacuum rectification process, the heating and vaporization of materials is the key, especially heating and vaporization under high vacuum. Chinese patents CN203090512U, CN206081699U, and CN206577407U disclose high-vacuum rectification devices using kettle-type reboilers. This type of reboiler has a large liquid holding capacity when heating and vaporizing high-boiling point materials, and the liquid layer on the surface of the heating coil is thick, making the heating plate The surface pressure of the tube is greatly increased. For example, t...

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Problems solved by technology

For example, taking glycerin (density 1260 kg / m³) as an example, the surface pressure of the heating coil will increase by 123 Pa for every increase in the thickness of the liquid layer by 1 cm. In industrial production, the liquid on the surface of the heating coil of a kettle reboiler When the layer thickness is 50cm, the actual vaporization pressure of the heating coil is about 6kPa higher than the operating pressure in the tower, which cannot realize the high vacuum (less than 1000Pa) in the material heating and vaporization process, and the residence time is long, so that the material needs to be heated at a higher temperature. Vaporization, resulting in partial denaturation or coking of heat-sensitive materials, reducing the distillation yield

[0003] Chinese patent CN101033411B discloses a falling film reboiler. Although it can reduce the thickness of the liquid layer to a certain extent, it is vaporized in the tube, which is easy to form a pressure drop in the tube, and it is difficult to realize the high vacuum of the material heating and vaporization process; China Patent CN102533309A discloses a rectification tower with multi-layer evaporation. The thickness of the heating liquid layer is lower than that of the kettle type, but the thickness of the liquid layer is still 10-20cm (about 1-2kPa). vacuum

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