Method for producing multifunctional differentiated polyester fiber

Abstract

The invention relates to a method for producing multifunctional differentiated polyester fiber. The method comprises the following steps that raw materials of purified terephthalic acid and ethylene glycol are firstly subjected to an esterification reaction in an esterification kettle to obtain a dimethyl terephthalate oligomer, then mixtures obtained after different modifiers are added into the dimethyl terephthalate oligomer on line separately through a pipeline are delivered to a first pre-polycondensation kettle, a second pre-polycondensation kettle and a third pre-polycondensation kettle separately to obtain pre-polymers of a certain viscosity, then the pre-polymers are delivered to a first final polycondensation kettle, a second final polycondensation kettle and a third final polycondensation kettle to obtain multifunctional and differentiated melt, and subsequently pelletizing or direct spinning is conducted. In the method for producing the multifunctional differentiated polyester fiber, a 'one head and three tails' technological process in a three-kettle procedure technology is adopted, the heat loss is effectively reduced, electric energy loss of electric equipment is reduced, more energy is saved, and the running cost is lower; the equipment layout is more compact, and the operation space is efficiently utilized.

Description

technical field [0001] The invention relates to a polyester production process in the field of light industry and textiles, in particular to a method for producing multifunctional differentiated polyester fibers. Background technique [0002] In 2015, my country's total chemical fiber output reached 48.31 million tons, accounting for 70% of the world's total, and accounting for more than 80% of the textile fiber processing volume. However, at present, my country's chemical fiber industry is still large but not strong, and the production mode of high investment, high consumption, and high emission has not been fundamentally changed. In particular, some conventional polyesters have large production capacity, fixed process flow, single production varieties, and serious product homogeneity. , and it is difficult to respond quickly to market changes for a variety of high value-added products that the market needs. [0003] Therefore, the current fixed polyester production process...

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Problems solved by technology

[0004] The purpose of the present invention is to address the above-mentioned problems and provide a method for producing multifunctional differentiated polyester fibers. The present invention optimizes the process flow of the existing polyester production method esterification-pre-shrinkage-final shrinkage into a set "One-to-three" flexible device: One esterification process is followed by three pre-condensation processes and three final poly-condensation processes, realizing flexible production of multiple varieties on large-capacity devices, reducing investment and operating costs, and reducing single sets The problem of high energy consumption for small devices

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