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Method for separating sodium terephthalate and alkaline solution from alkali deweighting waste liquid

A technology of sodium terephthalate and alkali reduction waste liquid, applied in chemical instruments and methods, neutralized water/sewage treatment, water/sewage treatment, etc. Many other problems to achieve the effect of low cost

Inactive Publication Date: 2012-07-25
朴光君
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too much sediment is produced in this way, which brings a great burden to the equipment operation of the sewage treatment plant, and the sediment cannot be reused, and its treatment cost is too high, so it cannot be widely used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] (1) Take 20 liters of alkali reduction waste liquid and filter it to remove polymer substances, and measure the alkali concentration (the alkali concentration at this time is generally lower than 5%).

[0012] (2) Take 100 ml of the filtrate in (1), add sulfuric acid to neutralize it until the pH value is 5, and a large amount of precipitate is precipitated, indicating that the filtrate contains a large amount of sodium terephthalate.

[0013] (3) Take 1 liter of the filtrate in (1), add high-concentration liquid alkali or soda ash, and adjust the alkali content in the mixture to 80g / L. Then filter with a nano-microporous ceramic filter with a pore size of 100-200 nanometers to obtain a filtrate and a precipitate respectively, wherein the precipitate is 4.3 g of sodium terephthalate.

[0014] (4) Take 1 liter of the filtrate in (1), add high-concentration liquid alkali or soda ash, adjust the alkali content in the mixture to 100g / L, and then filter it with a nano-microp...

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Abstract

The invention provides a method for separating sodium terephthalate and alkaline solution from alkali deweighting waste liquid and relates to the technical field of environmental friendliness. The method comprises the following steps of: adding liquid caustic soda or soda ash into the alkali deweighting waste liquid, so that the alkali concentration of the alkali deweighting waste liquid is adjusted to be 220 to 250 g / L; and separating the alkaline solution and the sodium terephthalate from the adjusted alkali deweighting waste liquid by using a nano-micropore ceramic filter. In the method, the alkali content of the original alkali deweighting waste liquid is increased by adding alkali, so that the sodium terephthalate under an ionic state and in a single molecule form is polymerized to be a polymer of macromolecular sodium terephthalate again; and then the polymer of the macromolecular sodium terephthalate can be separated from the mixed liquid conveniently through the nano-microporeceramic filter. In the method, the sodium terephthalate can be directly, completely and quickly separated from the alkali deweighting waste liquid at low cost, without using other chemical agents or changing the physical state.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to the technical field of pretreatment wastewater treatment of polyester fabrics. Background technique [0002] In order to improve the feel and softness of polyester fabrics, an alkali weight reduction process is carried out during the printing and dyeing process. The alkali weight reduction processes include intermittent (liquid flow) and continuous types. The two processes are roughly the same, and both use alkali to peel off polyester fabrics. Part of polyester in (PET). which is: [0003] PET + NaOH = sodium terephthalate + ethylene glycol. [0004] Therefore, this process leads to a large amount of high COD and high alkalinity lye wastewater in the process flow, and sodium terephthalate is the main substance of high COD because it is difficult to degrade. [0005] Now the commonly used treatment methods are: (1) collect them separately first, then add sulfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C02F1/66
Inventor 朴光明朴光君李东烨
Owner 朴光君
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