Method and system for controlling addition of polyester waste washing liquid

A washing liquid and polyester technology, applied in the direction of liquid cleaning methods, cleaning methods and utensils, chemical instruments and methods, etc., can solve the problems of infeasibility, complicated testing process, etc., and achieve stable active ingredient content and increase The effect of quality and stable quality

Inactive Publication Date: 2020-02-28
ZHEJIANG HAILI ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the content of sodium hydroxide is detected to determine the timing of adding the cleaning solution. The reagents and solutions used for testing sodium hydroxide include phenolphthalein indicator solution, barium chloride, hydrochloric acid standard solution, and methyl orange indicator solution. The test process is complicated. , it takes more than 30 minutes to test a sample, and barium chloride is highly toxic, so it is still not feasible to determine the addition of washing liquid according to the content of sodium hydroxide

Method used

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  • Method and system for controlling addition of polyester waste washing liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Unpack the purchased polyester bottle bricks and sort the materials to obtain waste polyester bottles;

[0063] Mix 8000 kg of water, 80 kg of cleaning agent, and 240 kg of sodium hydroxide to obtain a cleaning solution, and place the cleaning solution in a cleaning container (containing water);

[0064] According to the oil stains, label paper, and glue residue characteristics of the above-mentioned waste polyester bottles, the concentration of hydroxide ions in the washing liquid is set to 2.6mol / L;

[0065] Place waste polyester bottles continuously in the above-mentioned washing solution for cleaning; during the cleaning process, take 1ml of washing solution sample from the cleaning container after 2 hours, add phenolphthalein solution at the same time, and titrate with 0.1mol / L hydrochloric acid solution with 10-15ml of distilled water , after detection, the concentration of hydroxide ions in the washing liquid is 1.9mol / L;

[0066] The detected hydroxide ion conc...

Embodiment 2

[0073] The same as the method of controlling the addition of the cleaning liquid in Example 1, the difference is that the concentration of hydroxide ions in the cleaning liquid is set to be 2.6mol / L; the concentration of hydroxide ions in the cleaning liquid obtained after detection is 2.2 mol / L; After calculation, it is necessary to add 33L of the above-mentioned cleaning solution;

[0074] Detect the final cleaned bottle flakes: L (lightness) is 70.5, a (red-green) is -1.3b (blue-yellow) is 3.6. The pvc content is less than 70ppm, and the label sheet content is less than 100ppm.

Embodiment 3

[0076] The same as the method of controlling the addition of the cleaning liquid in Example 1, the difference is that the concentration of hydroxide ions in the cleaning liquid is set to be 3.2mol / L; after detection, the concentration of hydroxide ions in the cleaning liquid is 2.4 mol / L; After calculation, it is necessary to add 39L of the above-mentioned cleaning solution;

[0077] Detect the final cleaned bottle flakes: the L value (lightness) is 71.3, the a value (red-green) is -1.5, and the b value (blue-yellow) is 6.3. The pvc content is less than 80ppm, and the label film content is less than 90ppm.

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Abstract

The invention provides a method for controlling addition of polyester waste washing liquid. The method comprises the following steps: preparing the polyester waste washing liquid, wherein the concentration of hydroxyl ions in the washing liquid is marked as R; mixing the washing liquid with water to obtain washing liquid; setting the concentration of the hydroxyl ions in the washing liquid according to the type of polyester waste and the product requirements of a regenerated polyester bottle; and cleaning the polyester waste by using the washing liquid, and periodically detecting the concentration of the hydroxyl ions in the washing liquid in the cleaning process. According to the method, the concentration of the hydroxyl ions in the washing liquid and the preset concentration of the hydroxyl ions are periodically detected, and a quantitative amount of washing liquid can be added according to the detected concentration of the hydroxyl ions in the washing liquid, so that the content ofeffective components in the washing liquid is stable, and the quality of the regenerated polyester bottle is effectively improved and stabilized.

Description

technical field [0001] The invention relates to the technical field of recycling waste polyester bottles, in particular to a controlled addition method and a controlled addition system of polyester waste washing liquid. Background technique [0002] Polyester (PET) bottles are the main force in food and beverage packaging. The world's annual production of PET bottles is about 30 million tons, of which China is about 6 million tons. Post-consumer old polyester bottles (polyester waste) are extremely chemically inert and difficult to degrade under natural conditions, which not only imposes a great burden on the earth's environment, but also causes a great waste of resources. The recycling of polyester waste can effectively solve the problems of resource shortage, original resource development and waste discharge, and is of great significance to the realization of sustainable development. [0003] The first step in the recycling of polyester waste is to clean and process it, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/00B08B3/08
CPCB08B3/08B29B17/00B29B2017/0015Y02W30/62
Inventor 方光明张会华董凤敏孙江海胡晓佳冯银红
Owner ZHEJIANG HAILI ENVIRONMENTAL TECH CO LTD
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