Self-control distillation kettle

Abstract

The invention relates to a self-control distillation kettle for preparing acetic acid by using purified terephthalic acid (PTA) residual liquor. The self-control distillation kettle consists of an outer wall, an inner wall, a heat conducting oil cavity, a stirring shaft, a stirring frame, a motor, a speed changer, a liquid level meter and an A / D converter. A residual liquor inlet and an acetic acid outlet are formed in the top of the outer wall, and a residue outlet is formed in the bottom; the heat conducting oil cavity is formed between the inner wall and the outer wall, and an inner cavity of the distillation kettle is of vacuum seal; a distance between the stirring frame and the inner wall of the distillation kettle is 0.5 to 5 cm; the speed changer is connected with the stirring shaft, and a main shaft of the motor is connected with the speed changer; and the liquid level meter is arranged at the top of the outer wall and used for monitoring the change of a liquid level in the distillation kettle, a measured liquid level signal is converted to an electric signal by virtue of the A / D converter to be transmitted to a feeding opening at the top of the distillation kettle, and when the liquid level reaches a given value, the feeding opening is automatically opened to feed materials into the distillation kettle. The self-control distillation kettle has the advantages of high recovery efficiency, high speed, no accumulated 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 from 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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