Sulfonation and alkali fusion optimized production process for 2- naphthol

A naphthol sulfonated alkali and production process technology, applied in the direction of sulfonic acid preparation, organic chemistry, chemical instruments and methods, etc., can solve problems such as difficult processing, high chroma, complex components, etc., to reduce production costs, shorten The effect of process flow and optimization process

Inactive Publication Date: 2014-09-03
湖北鑫慧化工有限公司
View PDF3 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this process: Hydrolysis of naphthalene blowing, neutralization, and cold analysis in the production process produce a large amount of wastewater. The w

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 1,000 kg of refined naphthalene and 950 kg of sulfuric acid into the sulfonation reactor, and maintain the reaction at 160°C for 150 minutes. Sampling and analysis of a total acidity of 25.2% is qualified. Turn on the cooling water system, cool to 90°C, and discharge to the transition tank , continue to cool to 40°C, and vacuum filter out the acid water, requiring that the free acid be controlled at 5%; the filtered acid water is pumped to the acidification station for later use to obtain solid 2-naphthalenesulfonic acid. Add solid-state 2-naphthalenesulfonic acid in the horizontal auger, while stirring, dropwise add 30L of 50% liquid caustic soda to carry out neutralization reaction, the rate of addition is controlled at 5L / min, and the stirring speed is 15 rev / min. Generate 2-naphthalenesulfonic acid sodium salt sampling analysis pH value 6.5, moisture 15.2% is qualified. Add the sodium salt of 2-naphthylsulfonic acid generated by the neutralization reaction direc...

Embodiment 2

[0016] Add 1,500 kg of refined naphthalene and 1,420 kg of sulfuric acid into the sulfonation reactor, and maintain the reaction at 160°C for 150 minutes. Sampling and analysis of a total acidity of 25% is acceptable. Turn on the cooling water system, cool to 88°C, and discharge to the transition tank , continue to cool to 40°C, and vacuum filter out the acid water, requiring that the free acid be controlled at 5%; the filtered acid water is pumped to the acidification station for later use to obtain solid 2-naphthalenesulfonic acid. Add solid-state 2-naphthalenesulfonic acid in the horizontal auger, while stirring, dripping quality is 46L of liquid caustic soda of 50% to carry out neutralization reaction, and rate of addition is controlled at 5L / min, and stirring speed is 15 rev / min, and reaction Generate 2-naphthalenesulfonic acid sodium salt sampling analysis pH value 6.8, moisture 14.8% is qualified. The sodium salt of 2-naphthylsulfonic acid generated by the neutralizatio...

Embodiment 3

[0018] Add 2,000 kg of refined naphthalene and 1,900 kg of sulfuric acid into the sulfonation reactor, and maintain the reaction at 160°C for 150 minutes. Sampling and analysis of the total acidity is 24.9% as qualified. Turn on the cooling water system, cool to 88°C, and discharge to the transition tank , continue to cool to 40°C, and vacuum filter out the acid water, requiring that the free acid be controlled at 5%; the filtered acid water is pumped to the acidification station for later use to obtain solid 2-naphthalenesulfonic acid. Add solid-state 2-naphthalenesulfonic acid in the horizontal auger, while stirring, dripping quality is 62L of liquid caustic soda of 50% to carry out neutralization reaction, and rate of addition is controlled at 5L / min, and stirring speed is 15 rev / min, and reaction Generate 2-naphthalenesulfonic acid sodium salt sampling analysis pH value 6.6, moisture 15.1% is qualified. Add the sodium salt of 2-naphthylsulfonic acid generated by the neutra...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a sulfonation and alkali fusion optimized production process for 2-naphthol, and belongs to the field of organic chemical industry. By taking refined naphthalene as a material, 2-naphthol is prepared through processes such as sulfonating by 98% sulfuric acid, salting-out, alkali-fusing, acidifying, distilling, and the like. Defects of sulfonating, hydrolyzing and naphthalene-blowing, neutralizing, cold-separating, drying, alkali-fusing, acidifying and distilling in the convention process are overcome, the process is optimized, process flow is shortened, production cost is lowered, and no wastewater is produced; besides, the sulfonation and alkali fusion optimized production process for 2-naphthol has positive meaning for environment protection, and is especially applicable to production and usage of 2-naphthol.

Description

technical field [0001] The invention relates to an optimized production process of 2-naphthol sulfonated alkali fusion, which belongs to the field of organic chemical industry. Background technique [0002] 2-Naphthol is a dye intermediate widely used in dyes, pigments, spices, fungicides, antioxidants and other industrial products. Its derivatives G salt, K acid, γ acid, R salt, etc. are widely used in the dye industry. In recent years, the downstream products of 2-naphthol are used in the production of photosensitive materials and liquid crystal materials, and have a very broad market prospect. At present, the production method of 2-naphthol in industry is to use refined naphthalene as raw material, through 98% sulfuric acid sulfonation, hydrolysis and blowing of naphthalene, neutralization, cold analysis, suction filtration, drying, alkali fusion, acidification, distillation and other processes to prepare 2-naphthol - Naphthol. Disadvantages of this process: Hydrolysis ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07C39/14C07C37/055
CPCC07C37/055C07C37/64C07C303/06C07C39/14C07C39/235C07C309/35
Inventor 张伟东范明华郑宜斌
Owner 湖北鑫慧化工有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap