Falling film type devolatilizer and falling film element thereof

Abstract

The invention relates to a falling film type devolatilizer and a falling film element thereof. The falling film type devolatilizer comprises a vertical shell, a seal head connected with the upper endof the vertical shell, and a bottom shell connected with the lower end of the vertical shell; a material box body and at least one falling film element are arranged in the devolatilizer; the falling film element is provided with a plurality of falling film flow channels; a bottom plate of the material box body is a film distribution plate; and film distribution structures are distributed on the film distribution plate for all the falling film flow channels. The devolatilizer has the advantages of large film forming area, controllable film forming form, wide flow regulation range and the like,and is suitable for devolatilization processes such as high-viscosity polymer production, spinning solution deaeration, solution concentration and the like.

Description

technical field [0001] The invention relates to a falling-film devolatilization equipment used in the fields of polymer production, spinning liquid degassing, solution concentration, vacuum evaporation, etc., in particular to a production device for polymer polycondensation reaction, belonging to the field of chemical production equipment. Background technique [0002] In chemical operations such as polycondensation, degassing of spinning dope, vacuum evaporation, and desorption, the mass transfer efficiency of gradually removing small molecular compounds is the key factor to control the devolatilization process. Since this type of process usually occurs in a high-viscosity system, the diffusion of small molecular compounds in the system is very difficult, and the devolatilization effect will be limited by the internal structure of the equipment for material flow and the mixing characteristics of material flow. It is necessary to develop a devolatilizer with compact structur...

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Problems solved by technology

[0005] The disclosed vertical devolatilization reactor (a falling film polycondensation reactor outside the tube tube, CN102746499 B; a multi-layer falling tube type falling film devolatilization reactor, CN105903424 B), because it does not have an agitator, Therefore, the energy consumption is reduced, and the film formation and surface renewal can also meet certain production quality requirements, but the range of production material flow that can be adjusted is limited. When the material handling capacity is increased, the residence time is significantly reduced, and the product quality is reduced; and With the multi-layer shed structure, when the material leaves the shed during the falling film process, it is easy to cause direct fall and cannot return to the outer wall of the hollow tube, forming a so-called "short circuit", which makes the devolatilization effect worse and the viscosity of the material is uneven. , the multi-layer structure will also gradually increase the viscosity of the material, which will easily cause a significant difference in residence time when the lower tray flows radially, thereby affecting the devolatilization effect

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