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A tower type negative pressure continuous inert gas stripping naphthalene blowing method and its device

An inert gas and negative pressure technology, applied in the field of β-naphthalenesulfonic acid production, can solve the problems of difficult energy saving and emission reduction, clean production, production cost reduction, high energy consumption of naphthalene blowing, and meet the requirements of green production, The effect of small amount of public works and improvement of product quality

Active Publication Date: 2016-11-16
QUJING ZHONGYI SYNTHETIC CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the use of steam distillation to blow naphthalene consumes a lot of energy, and the production cost of the enterprise cannot be reduced, making it difficult to achieve the goals of energy saving, emission reduction, and clean production.

Method used

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  • A tower type negative pressure continuous inert gas stripping naphthalene blowing method and its device

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Experimental program
Comparison scheme
Effect test

Embodiment

[0031] A, one-stage naphthalene-blowing: the hydrolyzate after the sulfonation reaction mixture is hydrolyzed in the hydrolysis reactor 1 enters the first-stage naphthalene-blowing tower 3 through the heat exchanger 2, and then the hydrolyzate passes through the bottom of the tower coordinated with the first-stage naphthalene-blowing tower 3 Circulating pump 4 and tower bottom reboiler 5 are sprayed into primary naphthalene blowing tower 3 again from the fifth tray of primary naphthalene blowing tower 3, and pure nitrogen is blown from inert gas storage tank 7 through compressor 17 from primary stage The bottom of the naphthalene tower 3 is in contact with the hydrolyzate in a countercurrent manner, and the naphthalene vapor and nitrogen overflow from the top of the primary naphthalene blowing tower 3 into the vaporization condensation cooler 11, and the liquid phase naphthalene and nitrogen gas are sent from the vaporization condensation cooler 11 to the gas-liquid separator 1...

Embodiment 2

[0038] A, one-stage naphthalene-blowing: the hydrolyzate after the sulfonation reaction mixture is hydrolyzed in the hydrolysis reactor 1 enters the first-stage naphthalene-blowing tower 3 through the heat exchanger 2, and then the hydrolyzate passes through the bottom of the tower coordinated with the first-stage naphthalene-blowing tower 3 Circulating pump 4 and tower bottom reboiler 5 are sprayed into primary naphthalene blowing tower 3 again from the fifth tray of primary naphthalene blowing tower 3, and pure nitrogen is blown from inert gas storage tank 7 through compressor 17 from primary stage The bottom of the naphthalene tower 3 is in contact with the hydrolyzate in a countercurrent manner, and the naphthalene vapor and nitrogen overflow from the top of the primary naphthalene blowing tower 3 into the vaporization condensation cooler 11, and the liquid phase naphthalene and nitrogen gas are sent from the vaporization condensation cooler 11 to the gas-liquid separator 1...

Embodiment 3

[0045] A, one-stage naphthalene-blowing: the hydrolyzate after the sulfonation reaction mixture is hydrolyzed in the hydrolysis reactor 1 enters the first-stage naphthalene-blowing tower 3 through the heat exchanger 2, and then the hydrolyzate passes through the bottom of the tower coordinated with the first-stage naphthalene-blowing tower 3 Circulating pump 4 and tower bottom reboiler 5 are sprayed into primary naphthalene blowing tower 3 again from the fifth tray of primary naphthalene blowing tower 3, and pure nitrogen is blown from inert gas storage tank 7 through compressor 17 from primary stage The bottom of the naphthalene tower 3 is in contact with the hydrolyzate in a countercurrent manner, and the naphthalene vapor and nitrogen overflow from the top of the primary naphthalene blowing tower 3 into the vaporization condensation cooler 11, and the liquid phase naphthalene and nitrogen gas are sent from the vaporization condensation cooler 11 to the gas-liquid separator 1...

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Abstract

The invention discloses a method and a device for blowing naphthalene by means of tower-type negative pressure continuous inert gas stripping and blowing naphthalene. Compared with the traditional naphthalene blowing process, the total energy consumption is less than that of the traditional 30% of the process, because the inert gas is used instead of water vapor for stripping, the inert gas is not only effectively recycled, but more importantly, no waste water is generated during the naphthalene blowing process, eliminating the separation of naphthalene from water and subsequent treatment of waste water from the source Operation, greatly reduced production cost; Simultaneously the naphthalene blowing efficiency of the present invention is high, and the naphthalene content<0.2% in the product after final blowing naphthalene effectively improves the product quality of naphthalene series intermediate β-naphthalenesulfonic acid, and The naphthalene blowing time is shortened by two-thirds compared with the traditional process. The multi-stage tower negative pressure continuous naphthalene blowing process is simple, and the volume and quantity of equipment are greatly reduced compared with the traditional process, which effectively reduces the construction investment cost. The invention effectively reduces the cost input of the enterprise, and realizes the production requirements of energy saving, emission reduction, and green environmental protection.

Description

technical field [0001] The invention belongs to the technical field of beta-naphthalenesulfonic acid production, and in particular relates to a tower-type negative pressure continuous inert gas stripping naphthalene blowing method and a device thereof. Background technique [0002] α-naphthalenesulfonic acid and β-naphthalenesulfonic acid are important intermediates used in the production of dyes, pesticides and medicines, both of which are prepared from naphthalene as raw material through sulfonation reaction. The naphthalenesulfonic acid produced by the above method is often a mixture of its various isomers. α-naphthalenesulfonic acid and β-naphthalenesulfonic acid have different properties due to the different positions of their sulfonic acid groups. The production of some pesticides and drugs High-purity β-naphthalenesulfonic acid is needed, but even with the optimal combination of β-naphthalenesulfonic acid synthesis conditions, a small amount of α-naphthalenesulfonic a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/44C07C309/35C07C7/00C07C13/47
Inventor 罗国林冯辉
Owner QUJING ZHONGYI SYNTHETIC CHEMICAL CO LTD
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