Continuous preparation method for 2,6-dinonylnaphthalenesulfonic acid

A technology of dinonylnaphthalene sulfonic acid and nonylnaphthalene sulfonate, applied in the preparation of sulfonic acid, organic chemistry, etc., can solve the problems of low product purity, difficult reaction control, short reaction time, etc., and achieve high product purity , The effect of fast gas-liquid separation and short reaction time

Inactive Publication Date: 2016-05-25
湖南立新环保科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the production technology of 2,6-dinonylnaphthalenesulfonic acid in the prior art, there are too many acid residues, long settling time, difficult separation of products, serious corrosion of equipment by oleum, and sulfonation process using sulfonation reactor Among them, the reaction is difficult to control, there are many side reactions, and the product purity is not high; the purpose of the present invention is to provide a continuous sulfonation of 2,6-dinonylnaphthalene based on a falling film sulfonation reactor with high yield to prepare high-purity The method of 2,6-dinonylnaphthalenesulfonic acid has short process flow, short reaction time, low requirements on equipment, easy product purification, low cost, and fully meets the requirements of industrial production

Method used

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  • Continuous preparation method for 2,6-dinonylnaphthalenesulfonic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Heat the stripping tower to bring the 20% oleum storage tank to 150±2°C, dilute the sulfur trioxide with dried air to an average gas concentration of 4.82wt%, press 2,6-dinonylnaphthalene: sulfur trioxide =1:1 (mol:mol) ratio, 2,6-dinonylnaphthalene is introduced into the upper end of the falling film sulfonation reactor, after 2,6-dinonylnaphthalene is metered, it passes through the uniform distributor along the sulfonation reaction The inner wall of the reactor is membrane-like flow down, and the SO sprayed from the central nozzle of the sulfonation reactor 3 , Dry air mixture occurs membrane sulfonation reaction on the inner wall of sulfonation reaction, the reaction extends downward, and local overheating is avoided. The external cooling water jacket of the reactor, the temperature of the upper jacket is about 22°C, the temperature of the lower jacket is about 31°C, and the inside of the reactor is maintained at 50°C. The product mixture from the falling film sulfo...

Embodiment 2

[0034] Heat the stripping tower to bring the 20% oleum storage tank to 153±2°C, dilute the sulfur trioxide with dried air to an average gas concentration of 5.0wt%, press 2,6-dinonylnaphthalene: sulfur trioxide =1:1.2 (mol:mol) ratio, 2,6-dinonylnaphthalene is introduced into the upper end of the falling film sulfonation reactor, after 2,6-dinonylnaphthalene is metered, it passes through the uniform distributor along the sulfonation reaction The inner wall of the reactor is membrane-like flow down, and the SO sprayed from the central nozzle of the sulfonation reactor 3, Dry air mixture occurs membrane sulfonation reaction on the inner wall of sulfonation reaction, the reaction extends downward, and local overheating is avoided. The external cooling water jacket of the reactor, the temperature of the upper jacket is about 24°C, the temperature of the lower jacket is about 33°C, and the inside of the reactor is maintained at 52°C. The product mixture from the falling film sulfo...

Embodiment 3

[0036] Heat the stripping tower to bring the 20% oleum storage tank to 148±2°C, dilute the sulfur trioxide with dried air to an average gas concentration of 4.5wt%, press 2,6-dinonylnaphthalene: sulfur trioxide =1:1.1 (mol:mol) ratio, 2,6-dinonylnaphthalene is introduced into the upper end of the falling film sulfonation reactor, after 2,6-dinonylnaphthalene is metered, it passes through the uniform distributor along the sulfonation reaction The inner wall of the reactor is membrane-like flow down, and the SO sprayed from the central nozzle of the sulfonation reactor 3 , Dry air mixture occurs membrane sulfonation reaction on the inner wall of sulfonation reaction, the reaction extends downward, and local overheating is avoided. The external cooling water jacket of the reactor, the temperature of the upper jacket is about 24°C, the temperature of the lower jacket is about 32°C, and the inside of the reactor is maintained at 48°C. The product mixture from the falling film sulf...

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Abstract

The invention discloses a method for continuously preparing a 2,6-dinonyl naphthalene sulfonic acid. The 2,6-dinonyl naphthalene sulfonic acid is continuously produced through a falling film sulfonation reactor, and the method comprises the specific steps: 2,6-dinonyl naphthalene and a sulfur trioxide gas are continuously introduced into the falling film sulfonation reactor to be subjected to a falling film sulfonation reaction, a sulfonation reaction product is aged, settled to separate out acid residues, extraction and separation are carried out, the separated product is concentrated, acidized, washed with water, evaporated to remove a solvent to obtain the 2,6-dinonyl naphthalene sulfonic acid. According to the method, the efficient production of the high-purity 2,6-dinonyl naphthalene sulfonic acid is realized based on the fact that the 2,6-dinonyl naphthalene is continuously sulfonated in the falling film sulfonation reactor, the process flow is short, the reaction time is short, the facility request is low, the purification of the product is easy, the cost is low, and the industrial production requirements are completely met.

Description

technical field [0001] The invention relates to a method for continuously preparing 2,6-dinonylnaphthalenesulfonic acid, belonging to the field of fine chemical preparation. Background technique [0002] Dinonylnaphthalenesulfon, dark brown or brown viscous liquid, no irritating smell, not easy to oxidize, no discoloration, good stability, is a non-toxic, non-irritating, non-allergic anionic surfactant . [0003] Due to its excellent physical and chemical properties, dinonylnaphthalene sulfonic acid is widely used as a drying agent for baking varnishes, an extractant for synergistic extraction in hydrometallurgy, an additive for lubricating oils, greases and lubricants, an auxiliary agent for dyes, and resins additives. [0004] At present, there are very few manufacturers of dinonylnaphthalenesulfonic acid in my country, and all of them use fuming concentrated sulfuric acid as the sulfonating agent to produce dinonylnaphthalenesulfonic acid by tank method, but this produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/37C07C303/06
Inventor 曹敬梅松李立新
Owner 湖南立新环保科技发展有限公司
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