Second esterification reactor in continuous production device of poly (trimethylene terephthalate)

Abstract

The invention provides a second esterification reactor in a continuous production device of poly (trimethylene terephthalate) (PTT), comprising a reactor autoclave body, wherein, the reactor autoclave body is horizontal and provided with one or more separator plates inside, the separator plates separate the inner space of the reactor autoclave body into at least two cavities, each cavity has same or different length with other cavity, the bottom of the separator plate is provided with a through hole or a gap for the circulation of the materials, the upper edge of the separator plate is apart from the inner wall of the upper portion of the reactor autoclave body with a spacing, partial or all cavities are correspondingly provided with additive conduits and stirrers, and the reactor autoclave body is provided with a jacket and / or a heating coil. According to the invention, the retention time of the esters in different cavity is controllable, so that the esterification degree is controlled, and by adding various additives in the esters with different esterification degree in different cavity, the product quality is improved.

Description

technical field [0001] The invention relates to a device for producing polytrimethylene terephthalate, in particular to a second esterification reactor in a continuous production device for polytrimethylene terephthalate. Background technique [0002] Polytrimethylene terephthalate (PTT) is a new type of polyester material that was successfully developed industrially in the mid-1990s. In the existing continuous polymerization technology for producing poly(trimethylene terephthalate), the esterification reactor generally adopts a vertical reactor. Since various additives need to be added in different esterification stages during the production process, if a vertical reactor is used Then it is difficult to control the residence time of the additive, the technological process is complicated, and the equipment investment and production energy consumption are increased, which is not conducive to production management and reduction of production cost. Contents of the invention ...

AI Technical Summary

Problems solved by technology

In the existing continuous polymerization technology for producing poly(trimethylene terephthalate), the esterification reactor generally adopts a vertical reactor. Since various additives need to be added in different esterification stages during the production process, if a vertical reactor is used It is not easy to control the residence time of additives, the process flow is complicated, and it increases equipment investment and production energy consumption, which is not conducive to production management and reduction of production costs.

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