Process for preparing methyl sodiosul foaliphatate

A technology of sodium fatty acid methyl ester sulfonate and esterification, which is applied in sulfonate preparation, chemical instruments and methods, organic chemistry, etc. Control safety hazards, failure to produce normally, etc., to achieve the effect of not easy to quickly decompose, easy to operate, and stable pH value

Inactive Publication Date: 2007-10-17
ZANYU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boiling point of methanol is 64.8°C. Higher temperature will lead to higher pressure in the system, which will bring greater safety hazards to production operation control
In the 1990s, my country's Wuxi, Chengdu and Dalian all introduced MES production technology and equipment from the United States, but none of them were able to produce normally.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Carry out re-esterification and bleaching in a pump-type circulation mixing device with a cooler, add 10% methanol and 5% glycerol of the total amount of MES sulfonate to the aged MES sulfonate, and control the temperature at 55-60°C , then add the total amount of MES sulfonate H 2 o 2 1.8% and improver 1.0% (citric acid 0.5%, hydroxyethylidene diphosphonic acid 0.4%, ethylenediaminetetraacetic acid 0.1%), residence time 100min. Neutralize with 42% liquid sodium hydroxide, strictly control the pH value in the neutralization system at 6.0±0.5, and control the temperature at 50°C-55°C. After neutralizing and adjusting the pH, add H to the total amount of MES sulfonate 2 o 2 1.2% for secondary bleaching, and constantly monitor and adjust the pH value at 6.0±0.5, with a residence time of 80 minutes, and finally remove methanol and dry. The technical indicators of the obtained product are: MES content 72%, color (5% a.m, Klett) 40, disodium salt content 2.6%.

Embodiment 2

[0026] Carry out re-esterification and bleaching in a pump-type circulation mixing device with a cooler, add 8% methanol and 4% glycerol of the total amount of MES sulfonate to the aged MES sulfonate, and control the temperature at 55-65°C , then add the total amount of MES sulfonate H 2 o 2 1.0% and improver 1.5% (citric acid 0.8%, hydroxyethylidene diphosphonic acid 0.5%, ethylenediaminetetraacetic acid 0.2%), residence time 90min. Neutralize with 42% liquid sodium hydroxide, strictly control the pH value in the neutralization system at 6.0±0.5, and control the temperature at 50°C-55°C. After neutralizing and adjusting the pH, add H to the total amount of MES sulfonate 2 o 2 1.5% for secondary bleaching, and constantly monitor and adjust the pH value at 6.0±0.5, with a residence time of 100min. The technical indicators of the obtained product are: MES content 75%, color (5% a.m, Klett) 40, disodium salt content 2.6%.

Embodiment 3

[0028] Carry out re-esterification bleaching in a pump type circulating mixing device with cooler, add 5% methyl alcohol, 5% ethanol and 5% glycerol of MES sulfonate total amount in the MES sulfonate through aging, temperature is controlled at 55-65°C, then add H of the total amount of MES sulfonate 2 o 2 0.8% and improver 1.6% (citric acid 0.8%, amino trimethylene phosphonic acid 0.5%, glycolic acid 0.3%), residence time 120min. Neutralize with 42% liquid sodium hydroxide, strictly control the pH value in the neutralization system at 6.0±0.5, and control the temperature at 50°C-55°C. After neutralizing and adjusting the pH value, add 2.2% of the modifier of the total amount of MES sulfonate (citric acid 1.2%, hydroxyethylidene diphosphonic acid 0.7%, glycolic acid 0.2%) and H 2 o 2 1.2% for secondary bleaching, and constantly monitor and adjust the pH value at 6.0±0.5, with a residence time of 100min, and finally remove methanol and dry. The technical indicators of the ob...

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Abstract

The present invention disclosed a method for preparing sodium fatty acid methyl ester sulfonate, which takes fatty acid methyl ester sulphonic acid as raw material and reacted in pump type recycle mixing device with cooler, including re-esterification, prebleaching, neutralisation and quadric albefaction, in which disodium salt content of prepared product <=5.0%, color (5%a.m) <=50 Klett, neutralisation system MES content >=70%. The present invention rationally combines prebleaching with quadric albefaction through adding modifying agent and strictly controlling pH and using lesser methylic alcohol dosage, therefore the safety, operability and controllability of producing is capable of being greatly enhanced.

Description

1. Technical field [0001] The invention relates to a method for preparing sodium fatty acid methyl ester sulfonate, more particularly, relates to a method for continuous re-esterification and bleaching of an anionic surfactant fatty acid methyl ester sulfonate. 2. Background technology [0002] Fatty acid methyl ester sulfonate (MES for short) is a new type of anionic surfactant prepared from natural oils and fats. Good performance, so the development and application prospects are broad. However, due to the long production process and relatively difficult technology, especially in the effective control of disodium salt and color, and the safety of the device, further research, exploration and improvement are still needed. Therefore, MES can truly realize industrialization in the world. are still very few. [0003] As early as the 1930s, there was research on MES. There are many research reports on MES production technology. The literature shows that most of them are prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/62C07C303/32B01F17/08C09K23/08
Inventor 方银军邹欢金黄亚茹祝红元胡剑品孙明和任国晓汪家众冯晚静
Owner ZANYU TECH GRP CO LTD
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