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Industrialized preparation method of 2-carboxyl-3-naphthalene formic acid

A naphthoic acid and industrial technology, applied in the field of industrial preparation of 2-carboxy-3-naphthoic acid, can solve problems affecting export competitiveness, unstable product quality, dark color, etc., and achieve high energy utilization rate and low production cost Low, the effect of production process optimization

Inactive Publication Date: 2015-09-09
张晨
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the synthesis process is mainly divided into solid-phase method and liquid-phase method. Although the two methods have their own advantages, the products produced generally have common problems: unstable product quality, dark color, small particles, low content Low, affecting its export competitiveness

Method used

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  • Industrialized preparation method of 2-carboxyl-3-naphthalene formic acid

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Embodiment Construction

[0014] Such as figure 1 A kind of production technique of industrial preparation 2-carboxy-3 naphthoic acid shown is characterized in that the technique comprises first reaction tower 1, carboxylation reaction tower 2, second reaction tower 3, neutralization reaction tower 4, acid analysis Reaction tower 5, filter press reaction tower 6, fine filtration reaction tower 7, dehydration reaction tower 8, drying reaction tower 9, finished product storage tower 10, waste water treatment system 11, acid addition equipment 12, alkali addition equipment 13, resin filtration system 14 , naphthol recovery system 15, naphthol storage tank 16 etc.; Road connects the inlet of carboxylation reaction tower 2, by calculation, throws the 2-naphthol of corresponding amount to first reaction tower 1. Raise the temperature of the material, and when the temperature of the material in the tower rises to about 110°C, start stirring, rapidly raise the temperature to 125°C±5°C, and keep the temperatur...

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Abstract

The invention discloses an industrialized preparation method of 2-carboxyl-3-naphthalene formic acid. The 2-carboxyl-3-naphthalene formic acid is prepared by feeding raw materials into a first reaction tower, a carboxylation reaction tower, a second reaction tower, a neutralization reaction tower, an acidification reaction tower, a filter pressing reaction tower, a refined filtration reaction tower, a hydration reaction tower, a reaction tower and a finished product storage tower in turn. The 2-carboxyl-3-naphthalene formic acid is high in product purity up to over 98.89%, high in smelting point up to 220 DEG C, low in crystallization rate less than 3% and is yellowish-brown.

Description

technical field [0001] The invention relates to an industrial preparation method of 2-carboxy-3-naphthoic acid, which belongs to the field of chemical industry. Background technique [0002] 2-3 acid (named 2-Naphthoic-3-Hydroxylic acid) is an important intermediate used in the production of dyes (especially ice dyes), organic pigments and pharmaceuticals. 2-Naphthol is formed by carboxylation of raw materials. The waste water from 223 acid production comes from the acid analysis, water washing and filtration section. For every 1 ton of 223 acid finished product, 2~3m3 of waste water is discharged. Wastewater has high organic content, high acidity, high salt content, and poor biodegradability. The general methods of oxidation and coagulation are costly and difficult to apply in practical projects. Therefore, it is the key to realize the recovery of resources to achieve the purpose of treatment of this kind of wastewater. The 2 and 3 positions of the 2-3 acid naphthalene r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C65/11C07C51/27C07C51/42
CPCC07C51/27C07C51/487C07C51/50C07C65/11
Inventor 李宇钟
Owner 张晨
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