Filtering and dispersing device

Abstract

The invention discloses a filtering and dispersing device. The filtering and dispersing device is of an inverted basket filter and comprises a top circular filter screen and a cylindrical filter screen, wherein the upper end of the cylindrical filter screen is fixed to the circular filter screen; and a spiral-distributed arc-shaped baffle is arranged above the circular filter screen. The filteringand dispersing device disclosed by the invention is applicable to devices of all classes of pots and tanks needing dispersing and filtering actions. According to the filtering and dispersing device disclosed by the invention, a spiral distribution direction of the baffle is opposite to a stirring rotating direction of materials, so that a strengthened stirring effect is exerted, and the mixing effect on esterified substances in an esterification kettle is improved; a center hole of the top circular filter screen is used for enabling relatively large substances to pass through so as to avoid accumulation, and the condition that impeded discharging is caused due to the fact that a filter screen with small pores is plugged up is also prevented; and screen openings are uniformly distributed in circumferential surfaces of the top circular filter screen and the cylindrical filter screen to exert a filtering action, hydrolyzates in the esterification kettle can be dispersed, dispersed handful ordered carry-over is guaranteed, the sticking of an esterification pump is avoided, and a thermal cleaning frequency of the device is prolonged to once yearly from once semiyearly.

Description

technical field [0001] The invention belongs to the field of chemical production, and relates to a filtering and dispersing device, in particular to a filtering and dispersing device used in a PBT esterification kettle or a PTA slurry preparation tank in a PBT production device. Background technique [0002] PBT is prepared in the esterification tank. During the preparation process, the mixing effect of the esterification product in the esterification tank is crucial to the esterification reaction. Improving the mixing effect of the esterification product can effectively improve the esterification reaction. At the same time, when preparing PBT, a titanium-based catalyst such as tetrabutyl titanate is used. Due to the hydrolysis of the catalyst, on the one hand, the hydrolyzate should be discharged from the esterification kettle as much as possible to alleviate the fouling of the esterification kettle; on the other hand, There are no filtering measures at the outlet of the ex...

AI Technical Summary

Problems solved by technology

At the same time, when preparing PBT, a titanium-based catalyst such as tetrabutyl titanate is used. Due to the hydrolysis of the catalyst, on the one hand, the hydrolyzate should be discharged from the esterification kettle as much as possible to alleviate the fouling of the esterification kettle; on the other hand, There is no filtering measure at the outlet of the existing esterification kettle, and the outlet is directly connected with the esterification pump (generally adopting a gear pump). It is easy to get stuck and stop the pump, which will seriously affect the production

[0003] Chinese patent application 201410007480.4 discloses adding a spiral baffle on the inner wall of the PU resin reactor to increase stirring. The spiral baffle occupies the space of the reactor, which will affect the arrangement of the internal heating tubes and the arrangement of the agitator.

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