Method for extracting, separating and purifying glycollic acid from CMC industrial production wastewater

A glycolic acid and extraction technology, which is applied in the separation/purification of carboxylic acid compounds, preparation of carboxylate, organic chemistry, etc., can solve the problem of high cost, achieve the effects of reducing emissions, obvious economic benefits, and high purity

Pending Publication Date: 2021-06-15
恒达亲水胶体泰州有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is very difficult and costly to directly enter the industrial wastewater into biochemical treatment

Method used

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  • Method for extracting, separating and purifying glycollic acid from CMC industrial production wastewater
  • Method for extracting, separating and purifying glycollic acid from CMC industrial production wastewater
  • Method for extracting, separating and purifying glycollic acid from CMC industrial production wastewater

Examples

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Effect test

Embodiment 1

[0016] Embodiment 1: a kind of method for extracting, separating and purifying glycolic acid in CMC industrial production wastewater:

[0017] (1) 50g of CMC industrial production wastewater mother liquor is adjusted to pH between 0 and 1 with hydrochloric acid, and the precipitate is separated, and the acidified wastewater solution is separated by siphon method;

[0018] (2) Under normal temperature conditions, use methyl isobutyl ketone as the extractant, mix and stir the extractant with the waste water solution after acidification in step (1) in a mass ratio of 3:1, leave standstill, and separate the water phase and the oil phase;

[0019] (3) Under normal temperature conditions, add the same mass of water to the oil phase in step (2) for back extraction, stir for 30 minutes, let it stand for 60 minutes, separate the extractant and glycolic acid in the oil phase, and repeat the extraction and utilization of the extractant to step (1) , the glycolic acid solution is reproces...

Embodiment 2

[0023] Embodiment 2: a kind of method for extracting, separating and purifying glycolic acid in CMC industrial production wastewater:

[0024] (1) 50g of CMC industrial production wastewater mother liquor is adjusted to pH between 0 and 1 with hydrochloric acid, and the precipitate is separated, and the acidified wastewater solution is separated by siphon method;

[0025] (2) At 5° C., using methyl isobutyl ketone as an extractant, mixing the extractant with the waste water solution after acidification in step (1) according to a mass ratio of 3:1, stirring, standing, and separating the water phase and the oil phase;

[0026] (3) Add the same mass of water to the oil phase in step (2) for back extraction, raise the temperature of the system to 60°C, stir for 30 minutes, let stand for 60 minutes, separate the extractant and glycolic acid in the oil phase, and extract the extractant to step (1) Repeated extraction and utilization, the glycolic acid solution is reprocessed and con...

Embodiment 3

[0030] Embodiment 3: a kind of method for extracting, separating and purifying glycolic acid in CMC industrial production wastewater:

[0031] (1) 100g of CMC industrial production wastewater mother liquor is adjusted to a pH between 0 and 1 with hydrochloric acid, and the precipitate is separated, and the acidified wastewater solution is separated by a siphon method;

[0032] (2) Under normal temperature conditions, use methyl isobutyl ketone as the extractant, mix and stir the extractant with the waste water solution after acidification in step (1) in a mass ratio of 1:1, leave standstill, and separate the water phase and the oil phase;

[0033] (3) Under normal temperature conditions, add the same mass of water to the oil phase in step (2) for back extraction, stir for 30 minutes, let stand for 30 minutes, separate the extractant and glycolic acid in the oil phase, and repeat the extraction from the extractant to step (1) Utilize the glycolic acid solution to reprocess and ...

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Abstract

The invention provides a method for separating glycollic acid. The method mainly comprises the following steps of: (1) acidifying, precipitating and filtering industrial wastewater mother liquor containing sodium glycollate to convert the sodium glycollate into glycollic acid; (2) extracting the solution obtained in the step (1) by using an extracting agent, and conducting separating to obtain an extract and a residual solution; and (3) carrying out back extraction separation on the extract obtained in the step (2) to obtain a glycollic acid solution. The method for separating the glycollic acid has the main beneficial effects that operation is simple, the purity of the obtained glycollic acid is high, the wastewater mother liquor is effectively utilized, the waste is turned into the wealth, and production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical purification, and in particular relates to a method for extracting, separating and purifying glycolic acid from CMC industrial production wastewater. Background technique [0002] Glycolic acid, molecular formula HOCH 2 COOH, the molecular weight is 76.05, the CAS name is glycolic acid, and the CAS number is 74-41-1. It is a slightly white hygroscopic crystal and is odorless. The melting point is 79.5°C and the boiling point is 169.85. It is easily soluble in water, methanol, ethanol, acetone, acetic acid and ether. Glycolic acid is an important fine chemical intermediate. Because its molecule contains a carboxyl group and a hydroxyl group, it has dual chemical characteristics of acidity and alkalinity. As an important fine chemical raw material, it is widely used in medical materials, special washing and cosmetic industries. [0003] The full name of CMC is sodium carboxymethyl cellulose, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/02C07C51/48C07C59/06
CPCC07C51/02C07C51/48C07C59/06
Inventor 刘海山周渊超
Owner 恒达亲水胶体泰州有限公司
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