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Method and device for producing 2-naphthol and coproducing 2,3 acid by solvent method continuous carbonization

A solvent method and naphthol technology, which is applied in the field of synthesis and production of 2-hydroxy-3-naphthoic acid, can solve the problems of affecting product export competitiveness, large environmental impact, difficult and high-salt organic wastewater, etc., and achieve product purity and appearance. Color improvement, good economic benefits and environmental effects, the effect of reducing labor intensity

Active Publication Date: 2015-05-27
QUJING ZHONGYI SYNTHETIC CHEMICAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems are: high production cost, unstable product quality, which affects the export competitiveness of products; low utilization rate of carbon dioxide, large environmental impact; long gas-solid reaction time, large amount of by-products, and a total conversion rate of about 75%. The yield of the target product is low; a large amount of high-salt organic wastewater that is difficult to treat is produced, and the treatment cost is high (about 200 yuan / t of wastewater)

Method used

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  • Method and device for producing 2-naphthol and coproducing 2,3 acid by solvent method continuous carbonization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add the hydrogenated terphenyl and β-naphthol sodium into the ethanol solvent extraction concentrate from the extraction section in a mass ratio of 1.5:1 for mixing; after mixing evenly, enter the de-A rectification tower to remove the ethanol solvent; remove The material after the ethanol solvent enters the carbonization reactor and CO 2 Reaction, the reacted material enters the 2-naphthol crude product distillation tower to remove the 2-naphthol crude product and then enters the carbonization reactor and CO 2 Reaction: The content of sodium β-naphthol in the tower bottom material after continuous carbonization for 4 hours at a pressure of 0.7 MPa was 36.2%, and that of 2-naphthol was 0.5%. The 2-naphthol crude product at the top of the tower is sent to the rectification tower for continuous rectification to obtain qualified 2-naphthol products, which are sliced ​​and packaged by a slicing and packaging device for sale; the bottom materials are statically separated, an...

Embodiment 2

[0058] Add the hydrogenated terphenyl and β-naphthol sodium into the methanol solvent extraction concentrate from the extraction section in a mass ratio of 1.5:1 for mixing; after mixing evenly, enter the de-A rectification tower to remove the methanol solvent; remove The material after the methanol solvent enters the carbonization reactor and CO 2 Reaction, the reacted material enters the 2-naphthol crude product 2-naphthol crude product distillation tower and removes the 2-naphthol crude product and then enters the carbonization reactor and CO 2 Reaction: The content of β-naphthol sodium in the tower bottom material after the pressure is 0.7 MPa and continuous carbonization for 8 hours is 7.6%, and the content of 2-naphthol is 0.43%. The crude product at the top of the tower is sent to the 2-naphthol finished product rectification tower for continuous rectification to obtain qualified 2-naphthol products, which are sold after being sliced ​​and packaged by a slicing and pack...

Embodiment 3

[0060] Add 70% of 1-methyl-3-phenylindane + 30% of 12-alkylbenzene mixed solvent (referred to as B solvent) and β-naphthol sodium in a mass ratio of 2.0:1 to the extraction The n-propanol solvent extraction concentrate in the workshop section is mixed; after mixing evenly, it enters the de-A rectification tower to remove the n-propanol solvent; the material after removing the n-propanol solvent enters the carbonization reactor and CO 2 Reaction, after the reacted material enters the 2-naphthol crude product distillation tower to remove the 2-naphthol crude product, it enters the carbonization reactor and CO 2 Reaction: The content of β-naphthol sodium in the tower bottom material after the pressure is 0.8MPa and continuous carbonization for 10h is 4.6%, 0.55%. The crude product at the top of the tower is sent to the 2-naphthol finished product rectification tower for continuous rectification to obtain qualified 2-naphthol products, which are sold after being sliced ​​and packa...

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Abstract

The invention discloses a method and a device for producing 2-naphthol and coproducing 2,3 acid by solvent method continuous carbonization. The method is a new process for producing 2,3 acid by continuous carbonization, changes the traditional production process and method, and develops a new production technology for producing important intermediates and derivatives of naphthalene series dyes and pigments. The device comprises a 2-naphthol production system and a 2-hydroxy-3-naphthoic acid production system, wherein the 2-naphthol production system comprises a mother solution extracting tank, a mixer, a de-A rectifying tower, a carbonization reaction kettle, a crude 2-naphthol distillation tower, a 2-naphthol product rectifying tower and a slicing-packing device; the 2-hydroxy-3-naphthoic acid production system comprises a static separation system, a neutralization and filter pressing device, an acidification system and a centrifuging-washing and drying-packing device; the mother solution extracting tank is sequentially connected with the mixer, the de-A rectifying tower, the carbonization reaction kettle, the crude 2-naphthol distillation tower, the 2-naphthol product rectifying tower and the slicing-packing device; and the bottom material (2,3-acid disodium salt) of the crude 2-naphthol distillation tower is sequentially connected with the static separation system, the neutralization and filter pressing device, the acidification system, a centrifuge and drying-packing device.

Description

technical field [0001] The invention belongs to the technical field of synthesis and production of 2-hydroxy-3-naphthoic acid, and specifically relates to a method and a device for continuously carbonizing 2-naphthol and co-producing 2,3-acid by a solvent method. Background technique [0002] At present, the traditional synthesis process of 2-hydroxy-3-naphthoic acid (hereinafter referred to as 2,3-acid) at home and abroad is produced by intermittent gas-solid phase method (Kolbe-schmitt), that is, the reaction of 2-naphthol with sodium hydroxide 2-naphthol sodium salt is generated, after vacuum distillation and dehydration, it reacts with carbon dioxide for carboxylation (ie, electrophilic substitution) to generate 2-naphthol and 2,3-acid disodium salt, remove 2-naphthol, and separate The resulting 2-naphthol is then reacted with sodium hydroxide to form 2-naphthol sodium. After repeated distillation and salification, the resulting 2,3-acid bis-sodium salt is then neutraliz...

Claims

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Application Information

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IPC IPC(8): C07C65/11C07C51/41C07C51/15C07C51/42C07C39/14C07C37/055C07C37/70C07C27/00
CPCC07C37/055C07C51/02C07C51/15C07C39/14C07C65/11
Inventor 罗国林冯辉
Owner QUJING ZHONGYI SYNTHETIC CHEMICAL CO LTD
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