Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for producing 1,5-dihydroxy naphthalene

A technology of dihydroxynaphthalene and a production method, which is applied in chemical instruments and methods, inorganic chemistry, preparation of organic compounds, etc., can solve the problems of large processing capacity of mother liquor, difficult processing, difficult distillation of dilute sulfuric acid, etc., and achieves reduction of energy consumption. , the effect of simplifying the processing process

Inactive Publication Date: 2012-05-09
DONDONG SUNLINE CHEM
View PDF5 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned operation has the disadvantages of difficult distillation of dilute sulfuric acid, high equipment requirements, limited market for new products, generation of new pollutants, and high cost.
[0027] 2 Treatment of alkali fusion mother liquor: in the alkali fusion production process of 1,5 dihydroxynaphthalene, there is a large amount of excess alkali in the alkali fusion product, and when the product is precipitated It needs to be diluted with water first, then neutralized with hydrochloric acid, and after the product is separated, the rest is alkali fusion mother liquor, and the production amount is 15-20 tons of alkali fusion mother liquor per ton of 1,5 dihydroxynaphthalene
However, in the process of treating the sulfonated mother liquor and alkali-melted mother liquor in the existing technology, the mother liquor has a large amount of treatment and is difficult to handle, which seriously restricts the industrial production of this product.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for producing 1,5-dihydroxy naphthalene
  • Method for producing 1,5-dihydroxy naphthalene
  • Method for producing 1,5-dihydroxy naphthalene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1 Add 2300 kilograms of 20% fuming sulfuric acid in the reactor with stirring, then evenly add 400 kilograms of refined naphthalene;

[0053] 2 Then add the obtained sulfonated product to 2000 liters of the alkali fusion mother liquor obtained from the previous batch and prepared with a sodium sulfate concentration of 10%, and control the temperature to 40°C;

[0054] 3 Filtration to obtain 608 kg of 1,5 naphthalene disulfonic acid and sulfonated mother liquor, liquid chromatography analysis, 1,5 naphthalene disulfonic acid content 90%, yield 60%;

[0055] 4 Alkali fusion: react the filter cake of 1,5 naphthalene disulfonic acid with sodium hydroxide to generate an alkali fusion product;

[0056] 5 Neutralization: Add the sulfonated mother liquor to the alkali fusion product, add concentrated sulfuric acid to adjust the pH to 5.0, and the temperature is 60°C;

[0057] 6 Filtration: 1,5 dihydroxynaphthalene was obtained, the weight after drying was 250 kg, and the conte...

Embodiment 2

[0060] 1 Add 2300 kilograms of 20% fuming sulfuric acid in the reactor with stirring, then evenly add 400 kilograms of refined naphthalene,

[0061]2 Then add the obtained sulfonated product to 2500 liters of the alkali fusion mother liquor obtained from the previous batch and prepared with a sodium sulfate concentration of 15%, and control the temperature at 60°C;

[0062] 3 Filtration to obtain 653 kg of 1,5 naphthalene disulfonic acid and sulfonated mother liquor. Liquid chromatography analysis, 1,5 naphthalene disulfonic acid content 88%, yield 63%;

[0063] 4 Alkali fusion: react the filter cake of 1,5 naphthalene disulfonic acid with sodium hydroxide to generate an alkali fusion product;

[0064] 5 Neutralization: Add the sulfonated mother liquor to the alkali fusion product, add concentrated sulfuric acid to adjust the pH to 5.5, and the temperature is 80°C;

[0065] 6 Filtration: 1,5 dihydroxynaphthalene was obtained, the weight after drying was 260 kg, and the conte...

Embodiment 3

[0068] 1 Add 2300 kilograms of 20% fuming sulfuric acid in the reactor with stirring, then evenly add 400 kilograms of refined naphthalene;

[0069] 2 Then add the obtained sulfonated product to 3000 liters of the alkali fusion mother liquor obtained from the previous batch and prepared with a sodium sulfate concentration of 25%, and control the temperature at 80°C;

[0070] 3 Filtration to obtain 683 kg of 1,5 naphthalenedisulfonic acid and sulfonated mother liquor. Liquid chromatography analysis, 1,5 naphthalene disulfonic acid content 87%, yield 65%;

[0071] 4 Alkali fusion: react the filter cake of 1,5 naphthalene disulfonic acid with sodium hydroxide to generate an alkali fusion product;

[0072] 5 Neutralization: Add the sulfonated mother liquor to the alkali fusion product, add concentrated sulfuric acid to adjust the pH to 6.0, and the temperature is 80°C;

[0073] 6 Filtration: 1,5 dihydroxynaphthalene was obtained, the weight after drying was 260 kg, and the conte...

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 discloses a technological method for producing 1,5-dihydroxy naphthalene by a sulfonating alkali fusion method. The technological method comprises the steps of: 1, sulfonating; 2, thinning, after secondary treatment, thinning by using sodium sulfate solution obtained in a step 7; 3, filtering; 4, fusing by alkali; 5, neutralizing, adding sulfonation mother liquor obtained in the step 3 into alkali fusion product for neutralization; 6, filtering; and 7, sending partial alkali fusion mother liquor to the step 2 and thinning the same, and treating the rest alkali fusion mother liquor by alkali fusion. By using the mother liquor of the production progress, the total amount of the mother liquor is reduced, the total amount of waste water is decreased, and treatment difficulty of waste water is lowered.

Description

technical field [0001] The invention relates to a process for producing 1,5 dihydroxynaphthalene by a sulfonated alkali fusion method. Background technique [0002] Molecular formula of 1,5 dihydroxynaphthalene: C10H8O2 Molecular weight: 160.17 CAS number: 83-56-7 [0003] Structural formula: [0004] [0005] 1,5-Dihydroxynaphthalene is widely used as dyes, medicines, organic synthesis intermediates and monomers for high-temperature resistant and high-strength polymer preparation, and is an important intermediate. [0006] The production process of 1,5 dihydroxynaphthalene by sulfonated alkali fusion method is a relatively common production method of 1,5 dihydroxynaphthalene at present. In this production method, the separation of the sulfonated products of naphthalene is mainly based on the principle that the solubility of the sulfonated products of naphthalene varies greatly under the conditions of different sulfuric acid concentrations and temperatures. [0007] Th...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/14C07C37/04C07C309/35C07C303/06C01D5/00
Inventor 薛巍孙德林张继彤葛长利
Owner DONDONG SUNLINE CHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com