Method for reclaiming and treating phenol and p-hydroxybenzoic acid in p-hydroxybenzoic acid technique waste water

A recovery and treatment technology for p-hydroxybenzoic acid, applied in chemical instruments and methods, chemical recovery, separation/purification of carboxylic acid compounds, etc., can solve problems such as no discovery in extraction and recovery research, and reduce recovery and treatment costs and operating costs Low and save the effect of raw material consumption

Inactive Publication Date: 2008-08-13
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the recovery method of phenol in p-hydroxybenzoic acid process wastewater has not been reported yet
In particular, the simultaneous extraction and recovery of the two components of phenol and p-hydroxybenzoic acid in wastewater has not been found

Method used

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  • Method for reclaiming and treating phenol and p-hydroxybenzoic acid in p-hydroxybenzoic acid technique waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1, with reference to Fig. 1: extract p-hydroxybenzoic acid process waste water with extractant, phenol and p-hydroxybenzoic acid wherein are reclaimed simultaneously; Extractant adopts trioctylamine diluted with xylene, trioctylamine and The volume ratio of xylene is 1:2.3. The oil-water ratio during extraction was 0.3.

[0066] After back-extracting the primary extract with potassium hydroxide solution, the obtained regenerated extractant is subjected to secondary extraction of the primary raffinate aqueous phase. The concentration of the potassium hydroxide solution is 15%; the volume ratio of the extract and the potassium hydroxide solution is 1.5:1.

[0067] The stripping solution is returned to the raw material of the production process for carboxylation reaction.

[0068] The pH at the time of extraction was 1.26. The mixing time during extraction is 1 min to 5 min.

Embodiment 2

[0069] Embodiment 2 is basically the same as Embodiment 1, but has the following changes:

[0070] The extractant adopts trioctylamine, and the oil-water ratio during extraction is 0.5;

[0071] The concentration of potassium hydroxide solution is 20%;

[0072] The volume ratio of extract and potassium hydroxide solution is 3:1.

Embodiment 3

[0073] Embodiment 3 is basically the same as Embodiment 1, but has the following changes:

[0074] The extractant is tributyl phosphate; the oil-water ratio during extraction is 0.3;

[0075] The concentration of potassium hydroxide solution is 10%;

[0076] The volume ratio of extract and potassium hydroxide solution is 1.8:1.

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Abstract

Disclosed is a method for recoverying and treating phenol and p-hydroxybenzoate in p-hydroxybenzoate process wastewater, comprising: extracting the p-hydroxybenzoate process wastewater by an extractant, at the same time, recoverying phenol and p-hydroxybenzoate in the wastewater; the extractant is trioctylamine, tri-butyl-phosphate, xylene or n-octanol, or two or more mixtures selected therefrom; the extraction liquid is antiextracted by alkali matter solution, wherein the alkali matter is selected from: potassium hydroxide, sodium hydroxide or ammonia hydroxide; the antiextraction liquid is back to the production process to perform carboxylation. A preferable scheme is two-step refluence extraction; second extraction is performed on the extraction remaining aqueous phase, which is performed with first extraction, by a regeneration extractant after first extraction; the second extraction liquid is back to the first extraction step, and the original wastewater is performed with first extraction. The invention has obvious economical and environmental benefit, the recovery rate of phenol and p-hydroxybenzoate in the wastewater is about 100%, and the COD removing rate is 98.9%.

Description

technical field [0001] The invention relates to a method for treating industrial wastewater, in particular to a method for recovering and treating phenol and p-hydroxybenzoic acid in p-hydroxybenzoic acid process wastewater. Background technique [0002] p-Hydroxybenzoic acid is an important raw material for organic synthesis. Its synthesis methods mainly include p-toluenesulfonyl chloride method, salicylic acid transposition method and potassium phenate carboxylation method. Most industrial production uses potassium phenate carboxylation method. The synthesis method uses phenol as the starting material, and carbon dioxide is introduced into the potassium hydroxide medium for carboxylation reaction to generate phenol carboxyl potassium salt, which is dissolved in water and acidified to pH 1-2 with sulfuric acid, and p-hydroxybenzoic acid is precipitated from the solution. After cooling and separation, the product of p-hydroxybenzoic acid is obtained, and at the same time, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C65/03C07C51/48C07C39/04C07C37/72
CPCY02P20/582
Inventor 彭盘英王玉萍崔世海诸葛蓉
Owner NANJING NORMAL UNIVERSITY
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