Washing device and process of PET (polyethylene terephthalate) liquid-phase tackifying kettle

Abstract

The invention relates to a washing device of a PET (polyethylene terephthalate) liquid-phase tackifying kettle and a washing process using the washing device for washing the tackifying kettle, and belongs to the technical field of polyester fiber production. The washing device comprises a segmented heater, a solvent injection pipe, a circulation pipe, a buffer tank, a condenser and a liquid seal tank, wherein the segmented heater is arranged in an outer wall jacket of the tackifying kettle; the solvent injection pipe is arranged at the top of the tackifying kettle; one end of the buffer tank is connected with the tackifying kettle through the circulation pipe, and the other end of the buffer tank is connected to the top of the condenser through a steam pipe; a circulative pipe is arranged at the bottom of the condenser and divided into two branch pipes, one branch pipe is connected to the bottom of the buffer tank, and the other branch pipe is connected to the bottom of the liquid seal tank; and the upper part of the liquid seal tank is connected to the top of the condenser, and control valves are arranged on two branch pipes of the circulative pipe respectively and used for controlling connection and disconnection of corresponding pipelines. The washing device has the advantages of high washing efficiency, low cost and the like.

Description

technical field [0001] The invention relates to a cleaning device for a PET liquid-phase thickening kettle and a cleaning process for cleaning the thickening kettle by using the cleaning device, and belongs to the technical field of polyester fiber production. Background technique [0002] The production of polyester industrial filaments by liquid-phase viscosifying melt direct spinning is still a relatively new method. Its production process is substantially different from conventional chip spinning and liquid-phase viscosifying of ordinary fibers, and the equipment and processes are different. , so there is no reference. The liquid-phase viscosifying melt direct spinning of industrial yarn is through the melt entering and distributing from the top of the reactor, and under vacuum conditions, it flows down by gravity and self-weight to form a film. Among them, during the polycondensation reaction, the by-reaction products produced by the material reaction are separated fro...

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Problems solved by technology

Among them, during the polycondensation reaction, the by-reaction products produced by the material reaction are separated from the kettle under vacuum conditions. In a high temperature state, after long-term operation, the side reaction products undergo qualitative changes and form carbon formation. The residue of carbon formation will have various effects on the reactor and the materials in the reactor, such as uneven heat transfer and low heat transfer efficiency. The uneven heating of the melt directly affects the viscosity increasing effect and has a crucial influence on the spinnability of spinning

For the long-term operation of the thickening kettle, it is difficult to clean the carbon in the kettle with conventional solvents, and the recovery rate of the solvent after cleaning is very low, and the cleaning cost is high

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