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Method and equipment for preparing aromatic sulfonic acid by gas-phase sulphonation of aromatic organic compound

An organic and aromatic technology, applied in the gas-phase sulfonation of aromatic organics to prepare aromatic sulfonic acids and equipment, can solve problems such as side reactions, affecting product quality, unfavorable circulation and injection, and achieve small heat release and enhanced contact effect , improve the effect of selectivity

Active Publication Date: 2009-11-04
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common point of the above several reactors is that the sulfonation product must be circulated multiple times to achieve the purpose of cooling and removing heat and improving the conversion rate, and the sulfonation reaction is a fast and strong exothermic process, including a series of composite reactions (parallel reaction and series of reactions), multiple cycles are likely to cause side reactions, affecting product quality, and the viscosity of the sulfonated product is much higher than that of the raw material, which is not conducive to circulation and injection at high conversion rates

Method used

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  • Method and equipment for preparing aromatic sulfonic acid by gas-phase sulphonation of aromatic organic compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the sulfonation of toluene

[0033]use figure 1 The plant scheme shown performs the sulfonation of toluene. Adjust the rotational speed of the rotating packed bed 9 to 3000r / min, and the raw material toluene is cooled to -5°C to 0°C through the heat exchanger 2 before entering the rotating packed bed 9, and the flow rate of the toluene entering the system is 6kg / h, containing 6 kg of sulfur trioxide % (v / v) of mixed gas (the rest is dry air) flow rate is 7Nm 3 / h, the two raw materials react quickly in the rotating packed bed 9 and then enter the tube heat exchanger 23 through the liquid outlet 6, and cool down to maintain the temperature at 0°C to 10°C, and the reacted product enters the product storage tank 22. The sulfur trioxide and toluene are added into the reaction system at a molar ratio of 0.3:1. The para-isomer content in the toluenesulfonic acid produced by the reaction accounts for 87%-90%, while the meta-isomer content is not more than 1.0%...

Embodiment 2

[0034] Example 2: Sulfonation of Benzene

[0035] use figure 1 The plant scheme shown carries out the sulfonation of benzene. Adjust the rotating speed of the rotating packed bed 9 to be 500r / min, the flow of the benzene entering the system is 5kg / h, and the flow of the mixed gas (all the rest are dry air) containing sulfur trioxide 8% (v / v) is 9N m 3 / h, the two raw materials react quickly in the rotating packed bed 9 and then enter the external heat exchanger 23 through the liquid outlet 6, cool down and maintain the temperature at 20°C to 60°C, and the reacted product enters the product storage tank 22. The molar ratio of the sulfur trioxide and the benzene added to the reaction system is 0.5:1.

Embodiment 3

[0036] Example 3: Sulfonation of Benzene

[0037] use figure 1 The plant scheme shown carries out the sulfonation of benzene. Adjust the rotating speed of rotating packing bed 9 to be 1500r / min, the flow of the benzene that enters the system is 5kg / h, the flow that contains the mixed gas of sulfur trioxide 4% (v / v) (all the other are dry air) is 36Nm 3 / h, the two raw materials react rapidly in the rotating packed bed 9 and then enter the external heat exchanger 23 through the liquid outlet 6, cool down and maintain the temperature at 20°C to 30°C, and the reacted product enters the product storage tank 22. The molar ratio of the sulfur trioxide and the benzene added into the reaction system is 1:1.

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Abstract

The invention relates to a method and equipment for preparing aromatic sulfonic acid by the gas-phase sulfuric anhydride sulphonation of aromatic organic compounds with a rotating packed bed. The method solves the problems of the existing method in which the aromatic sulfonic acid is prepared by the sulphonation of aromatic organic compounds using sulfuric anhydride gas as sulphonating agent. The method is as follows: the aromatic organic compounds and the mixed sulfuric anhydride gas enter the started rotating packed bed and come into contact to produce partial sulphonation reaction; the liquid product after reaction enters a tubular heat exchanger and the reaction proceeds; and the aromatic sulfonic acid is obtained. The equipment comprises the rotating packed bed; the liquid inlet of the rotating packed bed is connected with a raw material storage tank; the gas inlet of the rotating packed bed is connected with the mixed sulfuric anhydride gas source; and the liquid outlet of the rotating packed bed is connected with a product storage tank through the tubular heat exchanger. The invention has the advantages of easy control of reaction temperature, reduction of the possibility of subsidiary reaction, enhancement of reactive selectivity, avoidance of environmental pollution, energy saving, small equipment volume, light weight, convenient installation and maintenance, and convenient starting and shutdown.

Description

technical field [0001] The invention relates to a method and equipment for preparing aromatic sulfonic acid by sulfonating aromatic organic matter with sulfur trioxide in gas phase by using a rotating packing bed. Background technique [0002] Aromatic sulfonic acid is a sulfonic acid organic compound obtained by sulfonating aromatic organic matter with a sulfonating agent such as concentrated sulfuric acid, oleum or sulfur trioxide. When concentrated sulfuric acid or oleum is used as sulfonating agent for sulfonation reaction, water will be generated during the reaction process, which will form waste acid, pollute the environment, corrode equipment, and be unfavorable for the sulfonation reaction; When the sulfonating agent is used for sulfonation reaction, it has the characteristics of strong sulfonation ability, high conversion rate, high product purity and no waste acid. Such as benzene, toluene, especially the sulfonation of heat-sensitive organic compounds, the resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/06C07C309/29C07C309/30C07C309/31B01J8/38
CPCY02P20/10
Inventor 刘有智袁志国焦纬洲姜秀平
Owner ZHONGBEI UNIV
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