Self-control distillation kettle

Abstract

The invention relates to a self-control distillation kettle for preparing acetic acid by use of purified terephthalic acid (PTA) raffinate. The self-control distillation kettle consists of an outer wall, an inner wall, a heat-conducting oil cavity, a stirring shaft, a stirring frame, an electromotor, a transmission, a liquidometer and an A/D (Analog to Digital) converter, wherein a raffinate inlet and an acetic acid outlet are formed at the top of the outer wall, and a residue outlet is formed at the bottom; the heat-conducting oil cavity is formed between the inner wall and the outer wall; an inner cavity of the distillation kettle is in vacuum sealing; the distance between the stirring frame and the inner wall of the distillation kettle is 0.5-5cm; the transmission is connected with the stirring shaft; a spindle of the electromotor is connected with the transmission; the liquidometer is arranged at the top of the outer wall and used for monitoring the liquid level change in the distillation kettle; a measured liquid level signal is converted into an electric signal through the A/D converter, and the electric signal is transferred to a feed port at the top of the distillation kettle; and when the liquid level reaches a certain value, the feed port is automatically opened for adding material into the distillation kettle. The self-control distillation kettle has the advantages of high recovery efficiency, high speed, no scale on the inner wall of the distillation kettle and automatic operation.

Description

technical field [0001] The invention relates to a self-control still, in particular to a still for preparing acetic acid with residual purified terephthalic acid (PTA), which belongs to the field of chemical equipment. Background technique [0002] A still is a device that uses the difference in volatility of the components in the mixture to achieve the purpose of separation. In the production of PTA, a large amount of difficult-to-handle PTA residues will be produced, thus causing large-scale accumulation and polluting the environment. The PTA raffinate contains acetic acid. It is an environmentally friendly and energy-saving method to recover acetic acid from the PTA raffinate by distillation, and then burn the waste residue as industrial fuel. At present, the distillation equipment used for acetic acid distillation is too simple, because the existing still still works under normal pressure, so the recovery rate of acetic acid is low, the recovery speed is slow, and the i...

AI Technical Summary

Problems solved by technology

The self-control still can not only realize automatic feeding, but also overcome the shortcomings of low recovery rate and slow recovery speed.

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