Environment-friendly preparation technology for producing 2-naphthol by liquid phase alkali fusion method

A preparation process and a liquid-phase alkali technology are applied in the field of environmental protection preparation technology for producing 2-naphthol by a liquid-phase alkali fusion method, which can solve the problems of secondary pollution, high use risk, easy coking and the like, and achieve zero emission and heating. uniform effect

Inactive Publication Date: 2014-12-10
青岛奥盖克化工股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Diluted liquid after alkali fusion 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 when reused.
During the alkali melting process, the material is easily coked, and the coke is sent to the solid waste plant for treatment, which costs a lot

Method used

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  • Environment-friendly preparation technology for producing 2-naphthol by liquid phase alkali fusion method

Examples

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Effect test

Embodiment 1

[0020] Example 1: Add 1420 parts of refined naphthalene to the sulfonation kettle using traditional techniques, heat to 120°C, add 98% sulfuric acid and heat up to 160°C for sulfonation. After reaching the end point, blow naphthalene and dilute with alkali And, filter to obtain sodium 2-naphthylsulfonate, add it to 3000kg (content 32%) of sodium hydroxide, heat to about 320°C, react with alkali fusion for 2 hours, then dilute, neutralize, and separate 2-naphthol phenol The crude product was washed with water, dehydrated, distilled and sliced ​​to obtain 1210kg of 2-naphthol with a yield of 91.18%.

Embodiment 2

[0021] Embodiment 2: production process is the same as embodiment 1, and alkali uses 3500kg (content 40%) potassium hydroxide solution instead, and alkali melting temperature is 280 ℃~290 ℃. Finally, 1250kg2-naphthol was obtained with a yield of 94.2%.

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Abstract

An environment-friendly preparation technology for producing 2-naphthol by a liquid phase alkali fusion method comprises the steps of sulphonating refined naphthalene into a sulfonation solution, neutralizing with a diluent after coarse 2-naphthol is separated to form 2-sodium naphthalene sulfonate or 2-potassium naphthalene sulfonate, then carrying out liquid phase alkali fusion with 20-50% of sodium hydroxide or potassium hydroxide (anhydrous alkali fusion after drying 2-sodium naphthalene sulfonate in the traditional technology), acidizing a mother solution after 2-sodium naphthalene sulfonate is filtered, extracting with an N235 complexation extraction agent, carrying out oxide purification and other procedures, and performing MVR (mechanical vapor recompression) concentrate and crystallization to produce sodium sulfate or potassium sulfate, wherein the liquid phase alkali fusion avoids coking of materials and increases yield.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and relates to an environment-friendly preparation process for producing 2-naphthol by a liquid-phase alkali fusion method. 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. Diluted solution after alkali fusion 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 when reused. During the alkali fusion process, the material is easily coked, and the coked material is sent to the solid waste plant for treatment, and the cost is relatively high. Contents of the invention [0003] In order to overcome the above-me...

Claims

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Application Information

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IPC IPC(8): C07C39/14C07C37/055C01D5/00
CPCC07C303/06C01D5/16C07C37/055C07C37/64C07C37/70C07C37/74C07C303/32C07C309/35C07C39/235C07C39/14
Inventor 王在军任帅昌王亚飞杨姗姗
Owner 青岛奥盖克化工股份有限公司
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