PET content detection method

Abstract

The invention relates to the field of chemical fiber regeneration and cyclic utilization, in particular to a PET content detection method which comprises the steps of solution preparation, sample preparation, alkaline hydrolysis sample preparation, PET content liquid chromatography detection and PET content analysis. The method comprises the following steps: carrying out alcoholysis on a polyesterfoam material by using an alkaline hydrolysis sample to obtain a raw material monomer, and carrying out liquid chromatography calibration by detecting sodium phthalate generated by the alcoholysis reaction, thereby implementing accurate detection on the PET content. The method is simple and convenient to operate and high in detection accuracy, can realize rapid analysis of high-impurity-content samples, and has a wide application prospect in polyester regeneration, especially textile regeneration.

Description

【Technical field】 [0001] The invention relates to the field of polyester chemical raw materials, in particular to a detection method for PET content. 【Background technique】 [0002] my country is a major producer of textiles and clothing, with a cumulative stock of nearly 100 million tons of waste textiles. my country’s annual fiber processing volume is about 50 million tons, and more than 20 million tons of waste textiles are produced. The comprehensive utilization of waste textiles is about 3 million tons, and the comprehensive utilization rate is only About 15%, most of the old clothes are eventually landfilled or incinerated as garbage. [0003] The cumulative production of waste textiles in my country has reached 140 million tons, and the annual growth rate of textile consumption has remained above 12%. According to statistics, the country produces more than 20 million tons of waste textiles every year. It is estimated that by the end of the 13th Five-Year Plan, the pr...

AI Technical Summary

Problems solved by technology

[0004] At present, polyester recycling uses chemical recycling because it reduces all textiles to prepare polymerized monomers, and the prepared raw materials are used for polyester polymerization, so the product quality is high, but there are also high production costs; and currently domestic In the process of polyester recycling by manufacturers, an important process is to use textiles to be washed and processed into foams, and then put into the alcoholysis reactor for reaction. However, because the content of PET in polyester foams is difficult to detect, so The raw materials input during the alcoholysis reaction have poor uniformity, resulting in large errors in the alcoholysis products and large material consumption, which brings great pressure on the production cost of the enterprise and the ecological environment.

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