Environment-friendly production process of 2-naphthol

A production process and a naphthol technology, which are applied in the field of 2-naphthol environmental protection production process, can solve the problems of high risk of use, high waste water treatment cost, secondary pollution and the like, and achieve the effect of improving yield

Active Publication Date: 2014-03-12
青岛奥盖克化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After alkali fusion, the dilute liquid is sulfurized with carbon dioxide. The use of sulfur dioxide is more dangerous, and a large amount of sodium sulfite containing organic matter is produced. Reuse causes secondary pollution. Wastewater contains 2-naphthol and other organic matter that has not been separated from sodium sulfite.
After filtration of sodium 2-naphthalenesulfonate, waste water containing sodium sulfate and sodium 2-naphthalenesulfonate is also produced. The treatment of the two streams of waste water is expensive and difficult

Method used

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  • Environment-friendly production process of 2-naphthol

Examples

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Embodiment 1

[0016] Add 1170 parts by weight of refined naphthalene to the sulfonation kettle, heat to 120°C, add 1100 parts by weight of 98% concentrated sulfuric acid, heat up to 160°C for sulfonation, and use the waste sodium sulfite aqueous solution after separating the crude 2-naphthol Neutralize, then neutralize with dilute alkali, crystallize, filter, dry, alkali melt, dilute, then neutralize with sulfuric acid at 70°C-80°C until the phenolphthalein is colorless, stand and separate the crude 2- Naphthol, then washed with water, dehydrated, rectified, and sliced ​​to obtain about 1000 parts by weight of 2-naphthol, the separated waste liquid goes to the alkali in step (1) and is used as lye, and the sulfur dioxide produced in neutralization is used with a soda ash aqueous solution Absorb sulfur dioxide to produce sodium sulfite.

Embodiment 2

[0018] Add 1170 parts by weight of refined naphthalene to the sulfonation kettle, heat to 120°C, add 1100 parts by weight of 98% concentrated sulfuric acid, and heat up to 160°C for sulfonation. The spent sodium sulfite aqueous solution is neutralized, alkali neutralized, crystallized, filtered, dried, alkali melted, diluted, and then neutralized with sulfuric acid at 70°C-80°C until the phenolphthalein is colorless, and the crude 2 -Naphthol, then washed with water, dehydrated, rectified, and sliced ​​to obtain about 1000 parts by weight of 2-naphthol, and the separated wastewater was adjusted to a pH of about 2 with sulfuric acid, according to the ratio of extractant:wastewater=1:3 (volume) Carry out three-stage extraction, (extractant volume ratio N 235 : 200 # Solvent oil=1:4), the extract is back-extracted with 5%-10% sodium hydroxide, and the back-extraction is used to dilute the sulfonation solution, which can increase the yield of 2-naphthol by 2%-3%. After being oxi...

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Abstract

The invention relates to an environment-friendly production process of 2-naphthol. The environment-friendly production process of the 2-naphthol comprises the following steps: adding refined naphthalene into a sulfonation kettle, adding concentrated sulfuric acid, heating and performing sulfonation reaction, neutralizing a mixture by using alkali after the reaction is finished, crystallizing, filtering, drying, performing alkali fusion and diluting; neutralizing the diluted alkali fused sulfonation liquid by using sulfuric acid at 70 to 80 DEG C, controlling the pH to be 4 to 7, standing and layering, and separating out crude 2-naphthol; washing, dehydrating and rectifying the separated crude 2-naphthol to obtain refined 2-naphthol; and removing alkali from the separated waste liquid, neutralizing to serve as alkaline liquid, absorbing sulfur dioxide generated by neutralization by using a sodium carbonate aqueous solution to produce sodium sulfite, adjusting the pH value of the waste liquid after 2-sodium naphthalene sulfonate is separated to be 2+/-1, performing three-stage extraction by using an extracting agent, performing reverse extraction on the extracting liquid by using dilute alkali, diluting sulfonated liquid by using the reverse extraction liquid, oxidizing the water phase by using a Fenton reagent or KMnO4, decoloring by using active carbon, and recovering sodium sulfate by a mechanical vapor recompression (MVR) concentration technology. By the process provided by the invention, no waste water is discharged basically and the production cost is reduced.

Description

technical field [0001] The invention relates to an environment-friendly production process of 2-naphthol, which belongs to the field of fine chemicals. Background technique [0002] 2-Naphthol is an important organic chemical raw material, which is used in medicine, pesticide, dye intermediate and other fields. In the existing technology, a large amount of waste water is generated in the production process, and the simple treatment cost is relatively high. After the alkali fusion, the diluted liquid is sulfurized with carbon dioxide. The use of sulfur dioxide is more dangerous, and a large amount of sodium sulfite containing organic matter is produced, which causes secondary pollution. 2-sodium naphthalene sulfonate also produces waste water containing sodium sulfate and sodium 2-naphthalene sulfonate after filtration, and the two streams of waste water treatment are expensive and difficult. Contents of the invention [0003] In order to overcome the disadvantages of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/04C07C39/14C01D5/14C01D5/16
CPCC01D5/14C07C37/04C07C39/14
Inventor 王在军任帅昌王亚飞杨珊珊李成好
Owner 青岛奥盖克化工股份有限公司
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