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A kind of method of producing phenol by salicylic acid sublimation residue

A salicylic acid and residue technology, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of turning waste into treasure and the inability to reasonably handle salicylic acid sublimation residues, and achieves a simple and efficient treatment process. Suitable for promotion and use, with considerable economic benefits

Active Publication Date: 2015-07-29
HEBEI JINGYE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for producing phenol from salicylic acid sublimation residues, so as to solve the problems that the salicylic acid sublimation residues cannot be treated reasonably, and the problems of turning waste into treasure and comprehensive utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put 200kg of salicylic acid sublimation residue into the cracking furnace, heat with a 39kw closed-type resistance far-infrared heater, control the temperature in the furnace to 450°C, stir, turn on the vacuum pump, and adjust the vacuum valve to make the vacuum in the furnace be -0.01 MPa, heating while stirring, so that the sublimation residue of salicylic acid in the furnace is heated and decomposed into crude phenol vapor; then the generated crude phenol vapor is passed into a distillation pot with a vacuum degree of -0.05MPa, and the superheated steam of 0.3MPa is used to Heating and purification, cooling the purified phenol to 45°C with a condenser, recycling it into a phenol storage tank, and filling it into barrels. After detection and analysis, the recovered phenol was 60kg, the recovery rate was 30%, the purity of the recovered phenol was 98.5%, and other indicators were in line with the national standard GB / T339-2001 for industrial synthetic phenol.

Embodiment 2

[0018] Put 300kg of salicylic acid sublimation residue into the cracking furnace, use a 39kw closed-type resistance far-infrared heater to heat, control the temperature in the furnace to 500°C, start stirring, turn on the vacuum pump, and adjust the vacuum valve to make the vacuum in the furnace be - 0.03MPa, heating while stirring, so that the residue of salicylic acid sublimation in the furnace is heated and decomposed into crude phenol vapor; Heating and purifying by steam, cooling the purified phenol to 45°C with a condenser, recovering it into a phenol storage tank, and filling it into barrels. After detection and analysis, the recovered phenol was 96kg, the recovery rate was 32%, the purity of the recovered phenol was 98.1%, and other indicators (except moisture content) were in line with the national standard GB / T339-2001 for industrial synthetic phenol.

Embodiment 3

[0020] Put 300kg of salicylic acid sublimation residue into the cracking furnace, use a 39kw closed resistance far-infrared heater to heat, control the temperature in the furnace to 550°C, start stirring, turn on the vacuum pump, and adjust the vacuum valve so that the vacuum in the furnace is - 0.06MPa, heat while stirring, so that the sublimation residue of salicylic acid in the furnace is heated and decomposed into crude phenol vapor; Heating and purifying by steam, cooling the purified phenol to 50°C with a condenser, recycling it into a phenol storage tank, and filling it into barrels. After detection and analysis, the recovered phenol was 93kg, the recovery rate was 31%, the purity of the recovered phenol was 97.8%, and other indicators (except moisture content) all met the national standard GB / T339-2001 for industrial synthetic phenol.

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Abstract

The invention discloses a method for producing phenol from salicylic acid sublimation residue. The method comprises the following steps: a, carrying out high-temperature pyrolysis, to be specific, stirring and heating the salicylic acid sublimation residue in a reaction chamber with a temperature of 450-550 DEG C and a vacuum degree of -0.01-0.06MPa to generate crude phenol; and b, distilling and purifying, to be specific, introducing the generated crude phenol into a distillation kettle with a vacuum degree of -0.05--0.07MPa, heating and purifying by using steam of 0.3-0.5MPa, and cooling and recovering. According to the invention, the salicylic acid sublimation residue is subjected to proper processing of heating pyrolysis and distillation and purification to be prepared into high-purity phenol which can be used as an important chemical raw material, thus the problem that a large quantity of salicylic acid sublimation residue waste cannot be reasonably utilized is successfully solved, the waste is changed into valuables, the environment pollution is reduced, and higher economic value is created.

Description

technical field [0001] The invention relates to a preparation method of phenolic compounds, in particular to a method for producing phenol by utilizing salicylic acid sublimation residue. Background technique [0002] Salicylic acid is an important pharmaceutical and chemical raw material, which is widely used in many fields. Salicylic acid produced in industry is mainly processed through specific methods by using phenol, carbon dioxide, sodium hydroxide, sulfuric acid, etc. as raw materials. Generally, the preparation process of salicylic acid is divided into crude and refining, and the crude salicylic acid is a crude product, which is a reddish powder crystal; in order to further obtain pure salicylic acid, people usually use Features, sublimation and refining to obtain pure salicylic acid; however, a large amount of salicylic acid sublimation residues are also produced. [0003] At present, there are mainly the following treatment methods for a large amount of salicylic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/50C07C39/04
Inventor 王会见武胜岩李付利
Owner HEBEI JINGYE CHEM CO LTD
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