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Method for removing pyridine base in mixed phenol

A technology of mixing phenol and pyridine bases, which is applied in the field of coal chemical industry, can solve the problems that the chroma cannot be guaranteed and the purity is difficult to be further improved, and achieve the effects of improving efficiency, improving purity, and good removal effect

Active Publication Date: 2020-02-07
SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the difficulties in removing pyridine base impurities in phenol products in the prior art, resulting in difficulties in further improving its purity and unguaranteed chroma, etc., thereby providing a mixture of pyridine base impurities in phenols removal method

Method used

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  • Method for removing pyridine base in mixed phenol
  • Method for removing pyridine base in mixed phenol
  • Method for removing pyridine base in mixed phenol

Examples

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Embodiment 1

[0039] This embodiment provides a method for removing pyridine bases in mixed phenols, comprising the following steps,

[0040] Mix 1000ml of mixed phenol with 15ml of oxalic acid aqueous solution with a volume fraction of 0.01%, and react at 45°C for 0.5h to obtain the first intermediate product. The first intermediate product is a mixture of mixed phenol and oxalic acid solution, including mixed phenol and oxalic acid High boiling point substances formed by solution reaction, including other substances that have not reacted with oxalic acid solution;

[0041] Then, the first intermediate product of 1000ml is mixed with 1.5ml aqueous sulfuric acid solution with a volume fraction of 2%, and reacted for 1h at 55°C to obtain the second intermediate product, which is not mixed with oxalic acid solution in the first intermediate product. High boiling point substances formed by the reaction of other reacted substances with sulfuric acid solution, including high boiling point substa...

Embodiment 2

[0045] This embodiment provides a method for removing pyridine bases in mixed phenols, comprising the following steps,

[0046] Mix 1000ml of mixed phenol with 15ml of oxalic acid aqueous solution with a volume fraction of 0.1% and react at 60°C for 0.5h to obtain the first intermediate product, which is a mixture of mixed phenol and oxalic acid solution, including mixed phenol High-boiling substances formed by reacting with oxalic acid solution, including other substances that have not reacted with oxalic acid solution;

[0047]Then 1000ml of the first intermediate product is reacted with 1.5ml of sulfuric acid aqueous solution with a volume fraction of 1% at 50°C for 1h to obtain the second intermediate product, which is the other intermediate product that has not reacted with the oxalic acid solution in the first intermediate product. High boiling point substances formed by the reaction of substances with sulfuric acid solution, including high boiling point substances forme...

Embodiment 3

[0051] This embodiment provides a method for removing pyridine bases in mixed phenols, the process of which is shown in figure 1 , including the following steps,

[0052] Mix 1000ml of mixed phenols with 15ml of oxalic acid aqueous solution with a volume fraction of 0.05%, and react at 50°C for 0.5h to obtain the first intermediate product;

[0053] Then 1000ml of the first intermediate product was mixed with 1.5ml of sulfuric acid aqueous solution with a volume fraction of 1.5%, and reacted at 50°C for 1h to obtain the second intermediate product;

[0054] 1000ml of the second intermediate product was mixed with 8ml of potassium permanganate aqueous solution with a volume fraction of 3.5% and reacted at 50°C for 0.5h to obtain the third intermediate product;

[0055] The third intermediate product is continuously transported to the dehydration tower, the third intermediate product removes light components and water in the dehydration tower, enters the slag removal tower, and...

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Abstract

The invention belongs to the technical field of the coal chemical industry, and particularly relates to a method for removing pyridine base in mixed phenol. The method comprises the steps of: performing a first reaction of the mixed phenol and oxalic acid solution to obtain a first intermediate product; performing a second reaction of the first intermediate product and sulfuric acid solution to obtain a second intermediate product; performing a third reaction of the second intermediate product and potassium permanganate solution to obtain a third intermediate product; and after rectifying thethird intermediate product, obtaining the refined mixed phenol. According to the method, three substances of oxalic acid, sulfuric acid and potassium permanganate sufficiently take a synergistic effect and are mutually and progressively removed in a classified mode so as to obtain the refined mixed phenol; after rectification, purity of the refined mixed phenol can reach over 99.9%, and content ofthe pyridine base is smaller than 0.005%, so that quality of the product is improved; and the refined mixed phenol is stable in color and difficult to discolor. By the method, impurities in the mixedphenol, such as organic nitrogen, organic sulfur and the like, also can be removed. Moreover, the method is simple in production process, convenient to operate and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method for removing pyridine bases in mixed phenols. Background technique [0002] Mixed phenol is a mixture of various isomers such as phenol, o-cresol, m-cresol, p-cresol, xylenol, ethylphenol, etc. It is an important chemical raw material with a wide range of uses and can be used as a medicine, dye , pesticides, adhesives, synthetic resins, polymer materials and other important materials, with high use value. [0003] With the continuous expansion of the use of mixed phenols and the rapid development of the industry, the market demand for mixed phenol products is increasing, and the quality requirements are getting higher and higher. In addition to various isomers such as phenol, mixed phenols also contain a certain amount of impurities such as pyridine bases, as well as a small amount of impurities such as organic nitrogen and quinoline. Impurit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/68C07C37/86C07C39/02
CPCC07C37/685C07C37/86C07C39/02
Inventor 苏怀强李秀辉王勇赵宁
Owner SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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