Continuous acidification process for synthesizing 2-naphthol

A process, the technology of naphthol, is applied in the field of continuous acidification process for synthesizing 2-naphthol, can solve the problems of difficult control, lengthened production cycle, and high synthesis cost, and achieves the reduction of waste water generation, the improvement of utilization rate, and the long service life. Effect

Active Publication Date: 2015-03-25
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the one hand, the unreacted sulfur dioxide in the batch method is directly absorbed by the recovery system under negative pressure, and the utilization rate of sulfur dioxide is low;
[0006] On the other hand, the entry of sulfur dioxide into the recovery system leads to high pressure on the recovery system and produces a large amount of waste water;
[0007] Three aspects, the reaction time of the batch method is long, the production cycle is lengthened, and there is a shortcoming that the synthesis cost is relatively high;
[0008] Four aspects, the sulfur dioxide from the neutralization reaction enters the acidification process separately and is difficult to control

Method used

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  • Continuous acidification process for synthesizing 2-naphthol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Flow is that 3.338 tons / hour 2-naphthol sodium (mixture, 2-naphthol content is 20.6%) enters the first acidification tower by the first injection nozzle in the first acidification tower middle part, 13.352 tons / hour 2-naphthol sodium ( Mixture, 2-naphthol content is 20.6%) enters the first acidizing tower by tower top, and 1.134 tons / hour sulfur dioxide enters the first acidizing tower by the first injection head, 2-naphthol sodium and sulfur dioxide convective flow in the first tower Quality, and react, the reaction temperature is 78 ° C, the first acidification tower packing is stainless steel corrugated packing, the reaction generated 2-naphthol and unreacted 2-naphthol sodium mixture (ie liquid mixture A) enters the first acidification The tower still of tower, unreacted sulfur dioxide gas is discharged from the tower top of the first acidification tower;

[0038]The mixed material (i.e. liquid mixture A) flowing out of the bottom of the first acidification tower is...

Embodiment 2

[0040] Flow rate is that 3.338 tons / hour 2-naphthol sodium (mixture, 2-naphthol content is 20.6%) enters the first injection head in the first acidizing tower tower, and 13.352 tons / hour 2-naphthol sodium enters the first by tower top One acidification tower, 1.134 tons / hour sulfur dioxide enters the first acidification tower through the first injection head, 2-naphthate sodium and sulfur dioxide convect mass transfer in the first tower and react, the first acidification tower packing is ceramic saddle packing , the unreacted sulfur dioxide gas enters the bottom of the second tower from the top of the tower and reacts with the material in the second tower, and the 2-naphthol and unreacted sodium 2-naphthol mixed solution that the reaction generates enters the first acidification tower tower kettle, and reacts The temperature is 78°C;

[0041] The mixed material in the bottom of the first acidification tower is pumped to the top of the second acidification tower and into the to...

Embodiment 3

[0043] Flow rate is that 3.338 tons / hour 2-naphthol sodium (mixture, 2-naphthol content is 20.6%) enters the first injection head in the first acidizing tower tower, and 13.352 tons / hour 2-naphthol sodium enters the first by tower top One acidification tower, 1.134 tons / hour sulfur dioxide enters the first acidification tower through the first injection head, 2-naphthate sodium and sulfur dioxide convect mass transfer in the first tower and react, the first acidification tower packing is stainless steel corrugated packing, The unreacted sulfur dioxide gas enters the bottom of the second tower from the top of the tower to react with the material in the second tower, and the 2-naphthol and unreacted 2-naphthol sodium mixture that is generated by the reaction enters the first acidification tower tank, and the reaction temperature is 78°C;

[0044] The mixed material in the bottom of the first acidification tower is pumped to the top of the second acidification tower and into the ...

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Abstract

The invention discloses a continuous acidification process for synthesizing 2-naphthol. Sodium 2-naphthol and sulfur dioxide are adopted as starting raw materials and are subjected to continuous acidification by virtue of a multi-stage acidification tower so as to obtain 2-naphthol. By specially designing the acidification tower and optimizing the process, the defects of complicated operation, low utilization rate of sulfur dioxide, large amount of wastewater, difficulty in control of the sulfur dioxide feed, large labor demand and high cost in the traditional process are overcome. Compared with the traditional process, according to the continuous acidification process disclosed by the invention, the utilization rate of sulfur dioxide is increased by about 7%, the amount of wastewater is decreased by about 9.8%, the production period is shortened by 5% and meanwhile, the sulfur dioxide feed is easily controlled, the labor demand is small and the cost is low.

Description

technical field [0001] The invention relates to the technical field of production of 2-naphthol, in particular to a continuous acidification process for synthesizing 2-naphthol. Background technique [0002] 2-Naphthol is an important organic raw material and dye intermediate, widely used, such as used in the manufacture of tunic acid, butyric acid, β-naphthol-3-carboxylic acid, and used in the manufacture of rubber additives, anti-aging agents, organic pigments and Medicine etc. [0003] There are many patents and literature reports about the synthesis process of 2-naphthol at home and abroad, as disclosed in the Chinese patent literature with the publication number CN103626637 through sulfonation, neutralization, crystallization, filtration, drying, alkali fusion, dilution, sulfuric acid Acidification and rectification obtain 2-naphthol, and describe the recovery and utilization of production wastewater at the same time, and realize that the process has basically no waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/14C07C37/01
CPCC07C37/055C07C39/14
Inventor 李进胡章云施孟华
Owner ZHEJIANG QICAI ECO TECH CO LTD
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