Improved method for preparing sodium lauryl sulfate

A technology of sodium lauryl sulfate and sulfamic acid, which is applied in the preparation of sulfate esters, organic chemistry, etc., and can solve problems such as irritation, harm, and danger

Inactive Publication Date: 2018-08-21
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chlorosulfonic acid is a liquid, which is easy to fume in the air and has a pungent smell. It needs special means of transportation during transportation, and its vapor is easy to cause irritation to mucous membranes and respiratory tract, and it is highly corrosive and irritating. Moreover, when it encounters water, it decomposes and releases a large amount of heat, and the HCl produced will seriously corrode the equipment, causing great inconvenience and danger to the operation process.

Method used

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  • Improved method for preparing sodium lauryl sulfate
  • Improved method for preparing sodium lauryl sulfate

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preparation example Construction

[0015] The preparation of embodiment 1, sodium lauryl sulfate, structural formula is as follows:

[0016]

[0017] Add 6.64g of raw material lauryl alcohol and 1.94g of sulfamic acid in a 100ml round bottom flask, and dissolve the raw materials under stirring conditions, and then add 1-butylpyridine bisulfate ([BPy]HSO 4 ) (structural formula is: ) 0.3884 g of acidic ionic liquid and 0.48 g of urea were used as catalysts, and stirred and reacted at 90° C. for 4 h. After the reaction was completed, it was treated with 30% NaOH solution to neutrality. After drying, it was washed with absolute ethanol and chloroform to obtain 3.69 g of pure white powder sodium lauryl sulfate, with an isolated yield of 64.0% and a melting point of 183 -185°C.

[0018] Identification of Sodium Lauryl Sulfate:

[0019] Infrared Spectrum IR(KBr)v / cm -1 : 2957, 2919, 2851, 1249, 1205, 830.

[0020] The product was identified to be consistent with the literature report.

Embodiment 2

[0022] Add 6.64g of raw material lauryl alcohol and 1.94g of sulfamic acid in a 100ml round bottom flask, and dissolve the raw materials under stirring conditions, and then add 1-butylpyridine bisulfate ([BPy]HSO 4 ) (structural formula is: ) 0.3884 g of acidic ionic liquid and 0.48 g of urea were used as catalysts, and stirred and reacted at 95° C. for 2 h. After the reaction was completed, it was treated with 30% NaOH solution to neutrality, and after drying, it was washed with absolute ethanol and chloroform to obtain 4.56 g of pure white powder sodium lauryl sulfate, with an isolated yield of 79.1% and a melting point of 183 -185°C.

[0023] The product was identified to be consistent with the literature report.

Embodiment 3

[0025] Add 6.64g of raw material lauryl alcohol and 1.94g of sulfamic acid in a 100ml round bottom flask, and dissolve the raw materials under stirring conditions, and then add 1-butylpyridine bisulfate ([BPy]HSO 4 ) (structural formula is: ) 0.3884 g of acidic ionic liquid and 0.48 g of urea were used as catalysts, and stirred and reacted at 100° C. for 4 h. After the reaction was completed, it was treated with 30% NaOH solution to neutrality, and after drying, it was washed with absolute ethanol and chloroform to obtain 5.30 g of pure white powder sodium lauryl sulfate, with an isolated yield of 91.9% and a melting point of 183 -185°C.

[0026] The product was identified to be consistent with the literature report.

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Abstract

The invention relates to a preparation method of a non-toxic and widely used fatty alcohol sulfate-type anionic surfactant. The preparation method comprises that sulfamic acid and lauryl alcohol as raw materials are stirred and undergo a reaction under catalysis of an acidic ionic liquid and urea to produce sodium dodecyl sulfate. The method has the advantages of mild reaction conditions, high product surface activity, low inorganic salt content, safe and simple operation and high yield.

Description

technical field [0001] The invention relates to a method for preparing a non-toxic and widely used fatty alcohol sulfate ester anionic surfactant in the field of organic chemistry, in particular to a new method for preparing sodium lauryl sulfate. Background technique [0002] Sodium lauryl sulfate is a non-toxic and widely used fatty alcohol sulfate ester salt type anionic surfactant. Its detergency is better than sodium alkylsulfonate and sodium alkylbenzenesulfonate. main active ingredient. Sodium lauryl sulfate is usually prepared by reacting lauryl alcohol with chlorosulfonic acid to form lauryl sulfate, which is then neutralized by alkali. However, chlorosulfonic acid is a liquid, which is easy to smoke in the air and has a pungent smell. It needs special means of transportation during transportation, and its vapor is easy to cause irritation to mucous membranes and respiratory tract, and it is highly corrosive and irritating. Moreover, when it encounters water, it d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/24C07C305/06
CPCC07C303/24C07C305/06
Inventor 杜玉英郭午杰马文路张文雅
Owner INNER MONGOLIA UNIV OF TECH
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