Crystal catcher applied to acid anhydrides

Abstract

The invention discloses a crystal catcher applied to acid anhydrides, relating to the technical field of production of 1,2,4,5-benzenetetracarboxylic anhydride and other acid anhydrides, and in particular relates to a crystal collection device. The crystal catcher applied to acid anhydrides comprises a cylindrical shell, wherein the upper end of the shell is connected with an upper spherical sealing head in a sealing manner; the lower end of the shell is connected with a lower conical sealing head in the sealing manner; the crystal catcher is characterized in that a plurality of springs are uniformly distributed in the shell; the upper ends of the springs are respectively connected with the upper end of the shell; the lower ends of the springs are free ends. As the springs can freely swing in the shell, the heat exchange area can be increased, and the materials attached to the springs can fall off at any time and are unlikely to stick to the springs. The crystal catcher applied to acid anhydrides has the advantages that the energy consumption is low, the loss is low, the material yield is high, the material blockage is avoided, the operation is continuous, the labor intensity is low, the crystal catcher does not need to be cleaned by washing and the waste water is not produced.

Description

technical field [0001] The invention relates to the technical field of production of pyromellitic dianhydride or other acid anhydrides, in particular to a crystal collection device thereof. Background technique [0002] The existing pyromellitic dianhydride crystal collection device is provided with a cylindrical shell, the upper end of the shell is sealed and connected with a spherical upper head, the lower end is sealed and connected with a conical lower head, and a circulating water jacket is set outside the shell. The cooling system is designed to fix the baffle inside the shell, and the high-temperature crystal enters from the upper head and is discharged from the bottom of the lower head after being cooled. [0003] The disadvantages of this kind of device are: high energy consumption, large loss, incomplete collection, equipment is easy to be blocked by materials, difficult to clean, washing will cause a large amount of sewage, environmental protection pressure is hig...

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Problems solved by technology

[0003] The disadvantages of this device are: high energy consumption, large loss, incomplete collection, equipment is easily blocked by materials, difficult to clean, washing will cause a large amount of sewage, environmental protection pressure is high, sewage treatment costs are increased, and labor intensity is high

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