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Alkyl benzene sulfonic acid discoloring process

A technology of alkylbenzene sulfonic acid and process, which is applied in the field of low-color alkylbenzene sulfonic acid products, and can solve problems such as inability to meet decolorization requirements, large color difference, and reduction of dark-colored alkylbenzene sulfonic acid color.

Inactive Publication Date: 2012-04-11
HUNAN LICHEN INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Alkylbenzene sulfonic acid is a surfactant widely used in the daily chemical industry, but the current production process is limited by the raw materials of alkylbenzene, and it often occurs that under the same production process conditions, the color of the raw materials is very different. Good color can reach about 10klett, and it is yellow-brown visually, while products with poor color have a color greater than 40klett, visually brown-black, and the use of downstream products will have a greater impact on color, resulting in higher requirements for color. product unavailable
However, a suitable treatment method to reduce the color of dark alkylbenzene sulfonic acid is very necessary, and the current common chemical decolorization methods basically cannot play a role; this technology is researched under such a background.
[0003] At present, there is no effective decolorization of alkylbenzenesulfonic acid, and the method of large-scale application is public. Only a small number of downstream manufacturers using alkylbenzenesulfonic acid decolorize materials, and hydrogen peroxide decolorization and sodium hypochlorite decolorization are used. But in fact, these two methods are basically ineffective for alkylbenzene sulfonic acid or the downstream products that cause darkening of color.
Moreover, these decolorization methods will introduce water, sodium chloride (salt) and other impurities that cannot be separated and cannot meet the decolorization requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Enter 3 tons of 35klett alkyl benzene sulfonic acid into the reaction kettle to maintain the temperature of the material at 45±5°C, add 1% by weight of alkyl benzene sulfonic acid, decolorizing agent activated clay, that is, 30 kg, stir to react 0.5 After hours, the stirring was stopped, the unloading centrifuge was turned on, and the reacted alkylbenzene sulfonic acid was input for separation. The finished product of alkylbenzene sulfonic acid was about 2.995 tons, the loss was about 5 kg, and the residue was about 35 kg. The color of benzenesulfonic acid is 12klett. The loss rate ratio of the decolorizing agent is 0.17%:1%=0.17. Based on the current market price of alkylbenzene sulfonic acid of 12,000 yuan per ton, the method of the present invention increases the processing cost by about 40 yuan per ton. Combined with energy consumption, the cost will increase by about 0.4%, which is fully acceptable to general enterprises.

Embodiment 2

[0018] Enter 3 tons of 42klett alkyl benzene sulfonic acid into the reaction kettle to maintain the temperature of the material at 45±5°C, add 2% of the weight of alkyl benzene sulfonic acid, decolorizing agent activated clay, that is, 60 kg, and stir for 1 After hours, the stirring was stopped, the unloading centrifuge was turned on, and the reacted alkyl benzene sulfonic acid was input for separation. The finished product of alkyl benzene sulfonic acid was about 2.988 tons, the loss was 12 kg, and the residue was about 72 kg. The color of sulfonic acid is 12klett. The loss rate is 0.4%: 2%=0.20 compared with the decoloring agent, and the processing cost per ton is increased by about 88 yuan by adopting the method of the present invention. Combined with energy consumption, the increase in cost is about 0.86%, which is fully acceptable to general enterprises.

Embodiment 3

[0020] Enter 3 tons of alkylbenzene sulfonic acid with a color of 45klett into the reactor to maintain the temperature of the material at 45±5°C, and add 3% by weight of alkylbenzene sulfonic acid as a decolorizing agent activated clay, which is 90 kg, and stir for 1 After hours, the stirring was stopped, the unloading centrifuge was turned on, and the reacted alkylbenzene sulfonic acid was input for separation. The finished product of alkylbenzene sulfonic acid was about 2.985 tons, the loss was about 22 kg, and the residue was about 112 kg. The color of benzenesulfonic acid is 14klett. The loss rate is 0.73%: 2%=0.243 than the decoloring agent, and the processing cost per ton is increased by about 148 yuan by adopting the method of the present invention. Combined with energy consumption, the increase in cost is about 1.36%, which is fully acceptable to general enterprises.

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Abstract

The invention relates to an alkyl benzene sulfonic acid discoloring process, belonging to alkyl benzene sulfonic acid discoloring technologies. The alkyl benzene sulfonic acid product with dark color is used as a treatment object, a certain proportion of activated clay (also called as acidified clay) is used as a treatment agent, and discoloring treatment is carried out to obtain the alkyl benzene sulfonic acid finished product meet the demand of various downstream products.

Description

Technical field [0001] The invention relates to a production method for decolorizing high-color alkyl benzene sulfonic acid products with a physical decolorizing agent to obtain low-color alkyl benzene sulfonic acid products. Background technique [0002] Alkylbenzene sulfonic acid is a surfactant widely used in the daily chemical industry. However, the current production process is restricted by the raw materials of alkylbenzene. Under the same production process conditions, the color difference of raw materials is very different. Good color can reach about 10klett, which is regarded as yellow-brown, while products with poor color are more than 40klett, which is regarded as brown-black. Use in downstream products will have a greater impact on color, resulting in higher color requirements. The product cannot be used. However, a suitable treatment method to reduce the color of dark alkyl benzene sulfonic acid is very necessary, and the current common chemical decolorization metho...

Claims

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Application Information

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IPC IPC(8): C07C309/30C07C303/44
Inventor 阳宇段玉臣
Owner HUNAN LICHEN INDAL