Formaldehyde rectifying tower

Abstract

The invention relates to the field of formaldehyde preparation, in particular to a formaldehyde rectifying tower. The formaldehyde rectifying tower comprises a fixed frame, a heating mechanism, a rectifying mechanism, a feeding mechanism, a condenser pipe, a cooling mechanism, a connecting mechanism and a collecting mechanism; gas is pre-cooled and liquefied inside the condenser pipe into a formaldehyde solution to enter the cooling mechanism; the formaldehyde solution tortuously moves inside the cooling mechanism, and the re-cooled formaldehyde solution penetrates through the connecting mechanism to enter the collecting mechanism; at a room temperature, formaldehyde in the formaldehyde solution inside the collecting mechanism evaporates, and the gaseous formaldehyde is in contact with low-temperature formaldehyde solution to be liquefied into the low-temperature formaldehyde solution, so that the evaporation speed of the formaldehyde in the collecting mechanism is reduced; in the rectifying process, part of the low-temperature formaldehyde solution slides inside the connecting mechanism to enter the rectifying mechanism; reflux fluid inside the rectifying mechanism is at a low temperature, and the boiling point of the formaldehyde is low, so that the formaldehyde inside the reflux fluid evaporates into the condenser pipe, and the content of the gaseous formaldehyde is increased.

Description

technical field [0001] The invention relates to the field of formaldehyde preparation, in particular to the formaldehyde rectification tower. Background technique [0002] Formaldehyde, chemical formula HCHO or CH 2 O, molecular weight 30.03, also known as formaldehyde. Colorless, irritating to human eyes and nose. The relative density of gas is 1.067 (air=1), and the density of liquid is 0.815g / cm 3 (-20°C). Melting point -92°C, boiling point -19.5°C. Soluble in water and ethanol. The concentration of the aqueous solution can be up to 55%, usually 40%. It is called formaldehyde water, commonly known as formalin (formalin), which is a colorless liquid with a pungent smell. [0003] In the process of formaldehyde rectification, the rectified formaldehyde solution is stored inside the collection bottle. The collection bottle is at room temperature, and the boiling point of formaldehyde is low. Under normal room temperature, the formaldehyde in the solution inside the col...

AI Technical Summary

Problems solved by technology

[0003] In the process of formaldehyde rectification, the rectified formaldehyde solution is stored inside the collection bottle. The collection bottle is at room temperature, and the boiling point of formaldehyde is low. Under normal room temperature, the formaldehyde in the solution inside the collection bottle is volatile and upward The movement enters the interior of the rectification tower, causing the solute in the solution inside the collection bottle to decrease continuously, reducing the rectification effect of the rectification tower

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