Sublimation-method pyrogallic acid cold trap recovery device

Abstract

The invention discloses a sublimation-method pyrogallic acid cold trap recovery device. The bottom part of a sublimator (2) is provided with an electric heater (1); the outlet of the sublimator (2) is connected with a crystallizer (3); the tail part of the crystallizer (3) is provided with a vacuum system connecting pipe (5); six crystallizer cold traps (4) are arranged above the interior of the crystallizer (3); a receiver (13) is arranged below the interior of the crystallizer (3); the crystallizer cold traps (4) are connected with pipelines outside the crystallizer (3); external connectors above the six crystallizer cold traps (4) are connected onto an inlet pipeline in parallel; butt joint pipe orifices on the side faces of the bottom parts of the six crystallizer cold traps (4) are connected onto an outlet pipeline in parallel; the inlet pipeline above the six crystallizer cold traps (4) is connected with a superheated steam inlet pipe (8) and a cooling water inlet pipe (9); and parallel outlet pipelines on the side faces of the bottom parts of the six crystallizer cold traps (4) are connected with an outlet return pipe (11). According to the sublimation-method pyrogallic acid cold trap recovery device disclosed by the invention, the product purity and the recovery rate are increased, and the occupied area of equipment is greatly reduced.

Description

technical field [0001] The invention belongs to the field of chemical equipment, and in particular relates to a sublimation method pyrogallic acid cold trap recovery and crystallization device. [0002] Background technique [0003] Existing pyrogallic acid sublimation method production equipment, pyrogallic acid recovery is natural sedimentation method recovery, its disadvantages are: [0004] 1. Because the fine crystals of pyrogallic acid are suspended in the air, it is difficult to land, and finally they are sucked into the vacuum pump washing system by a powerful vacuum system, resulting in product loss. [0005] 2. Since the crystallizers are all made of metal, the receptors for pyrogallic acid are also made of metal. The characteristic of pyrogallic acid is that it is easy to form complexes with metal ions, thus affecting the purity of the product. [0006] 3. Since pyrogallic acid is recovered by natural sedimentation method, the crystallizer is very long, occupies...

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Problems solved by technology

[0004] 1. Because the fine crystals of pyrogallic acid are suspended in the air, it is difficult to land, and finally they are sucked into the vacuum pump washing system by a powerful vacuum system, resulting in product loss

[0005] 2. Since the crystallizers are all made of metal, the receptors that withstand pyrogallic acid are also made of metal. The characteristic of pyrogallic acid is that it is easy to form complexes with metal ions, thus affecting the purity of the product

[0006] 3. Due to the recovery of pyrogallic acid by natural sedimentation method, the crystallizer is very long, occupies a large area, and the equipment manufacturing cost is relatively high

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