A melt polycondensation reactor

Abstract

The invention discloses a melting polycondensation reactor. The molten prepolymer slides down along the falling film flow channel of the falling film element to form a film and undergoes polycondensation reaction. Concave falling film flow channel. The plate-type falling film element is installed vertically, and its falling film flow channels are arranged in parallel and equipped with film distribution holes. The size of the falling film flow channels and the arrangement of the film distribution holes can be adaptively designed for the melting polycondensation reaction of different types of polymers; the internal design of the falling film element There is a heat medium circulation pipeline system to ensure that the molten material is heated evenly and stably when it moves along the falling film flow channel. The design and processing of the falling film element of the reactor is flexible and efficient, the flow resistance of the reaction material is small, there is no dead zone, the film forming area and the surface renewal frequency are large, and it meets the process of flat push flow. It can be used for polyethylene terephthalate, polyethylene terephthalate Efficient melt polycondensation reaction of propylene glycol phthalate, polybutylene terephthalate, polyethylene naphthalate, polyamide, polycarbonate, etc.

Description

technical field [0001] The invention relates to a melting polycondensation reactor equipment in the production of high-viscosity polymers. Background technique [0002] Polycondensation reaction is a reversible polymerization reaction in which monomers are gradually polycondensed to form high molecular weight polymers. The process is accompanied by the production of small molecular compounds. Polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) ), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyamide (PA) and polycarbonate (PC) are prepared according to the polycondensation reaction mechanism . The implementation methods of polycondensation reaction mainly include melt polycondensation, solid-state polycondensation, interfacial polycondensation, etc. Among them, melt polycondensation is widely used because of its high reaction efficiency, short process, energy saving and environmental protection, and flexibility and large-scale produc...

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Problems solved by technology

The film-forming efficiency (the surface area produced by the melt per unit volume flow rate) and the surface renewal frequency (the number of times the gas-liquid surface is renewed per unit time) of this type of reactor material are closely related to the interaction between the stirring element and the material, but When the viscosity of the material is too high, the material will stick between the discs or meshes of the stirring element. In severe cases, it will even pull out all the material and rotate it synchronously, thereby limiting the film-forming efficiency and surface renewal frequency of the melt, with little impact Molecular devolatilization; limited by the structure of the reactor, the reaction temperature of the material is not uniform and the melt flow condition is not good, there are many dead zones, and there is little room for equipment improvement for higher viscosity polymers

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