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Extraction method of p-aminobenzoic acid

A para-aminobenzoic acid and extraction technology, which is applied in chemical instruments and methods, liquid solution solvent extraction, preparation of organic compounds, etc., can solve the problems of unsuitable industrial application, difficulty in regeneration of adsorbents, cumbersome back-extraction process, etc. Mild operating conditions, good solubility, and strong selectivity

Active Publication Date: 2015-09-23
FUJIAN WANKE PHARMA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chemical and biological methods cannot be recycled, and the chemical method has high interest. The biological method requires a small amount of dilution of wastewater: the physical method can achieve recovery, but it has defects such as difficult regeneration of the adsorbent and cumbersome stripping process, which is not suitable. Industrial application

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  • Extraction method of p-aminobenzoic acid
  • Extraction method of p-aminobenzoic acid

Examples

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Effect test

Embodiment 1

[0031] Mix 1mL of N,N,N-trioctylammonium propionate protic ionic liquid with 3mL of p-aminobenzoic acid aqueous solution with a concentration of 800ppm at pH=7, stir at 25°C for 5min at a stirring rate of 500rpm, and let stand to separate After layering, the concentration of p-aminobenzoic acid in the water layer after extraction was detected by an ultraviolet spectrophotometer, and the extraction rate of the ionic liquid was calculated to be 86.38%.

Embodiment 2

[0033] Mix 1mL of N,N,N-trioctylammonium propionate protic ionic liquid with 3mL of p-aminobenzoic acid aqueous solution with a concentration of 800ppm at pH=7, stir at 25°C for 10min at a stirring rate of 500rpm, and let stand to separate After layering, the concentration of p-aminobenzoic acid in the water layer after extraction was detected with an ultraviolet spectrophotometer, and the extraction rate of the ionic liquid was calculated to be 86.66%.

Embodiment 3

[0035] Mix 1mL of N,N,N-trioctylammonium propionate protic ionic liquid with 3mL of p-aminobenzoic acid aqueous solution with pH=7 and concentration of 800ppm, stir at 25°C for 20min at a stirring speed of 500rpm, and let stand to separate After layering, the concentration of p-aminobenzoic acid in the water layer after extraction was detected with an ultraviolet spectrophotometer, and the extraction rate of the ionic liquid was calculated to be 86.80%.

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Abstract

The invention relates to an extraction method of p-aminobenzoic acid and belongs to the field of extraction separation. The extraction method of p-aminobenzoic acid comprises the steps that an extraction agent is made to be in contact with a water solution containing p-aminobenzoic acid, wherein the extraction agent is TOAP ionic liquid. By the adoption of the extraction method, the extraction efficiency is high, the selectivity is high, the extraction rate of p-aminobenzoic acid can reach over 93%, operation conditions are mild, and the extraction method is environmentally friendly.

Description

technical field [0001] The invention relates to a method for extracting p-aminobenzoic acid, which belongs to the field of extraction and separation. Background technique [0002] As an important organic chemical intermediate, p-aminobenzoic acid is widely used, and its output is increasing year by year. At the same time, the amount of sewage discharge in the production process is also increasing year by year. It has high toxicity and poor biodegradability, which has become the focus and difficulty of water pollution control. Coagulation, biochemical or chemical oxidation treatment methods are difficult to recover from water bodies. Therefore, it is of great significance to use new processes and new technologies to realize the cleaning of wastewater from such substances. [0003] At present, the commonly used extraction methods are physical, chemical, biological and other methods. Physical treatment methods mainly include adsorption and extraction. However, chemical and b...

Claims

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Application Information

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IPC IPC(8): C07C229/60C07C227/40B01D11/04
CPCC07C227/40C07C229/60
Inventor 尹静梅吴海燕李长平
Owner FUJIAN WANKE PHARMA CO LTD
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