SU391139A1 - METHOD FOR PRODUCING ALKYLSULPHATES - Google Patents

Description

one

The invention relates to a process for the preparation of alkyl sulfates which contain an alkyl residue with 14 to 20 carbon atoms in the chain.

A known method of producing alkyl sulfates by sulphating higher alcohols containing Ci4- 20 20 atoms with some sulfating agent, for example, oleumurea complex, followed by neutralization of the resulting acid alkyl sulfates with cooling water.

However, to neutralize acidic alkyl sulfates, a large excess of soda is required, equal to 180-200% of the required amount. This gives the target product containing a large amount of free soda, which limits the scope of such a product.

The purpose of the invention is to increase the purity of the target product.

This is achieved by the fact that the mixture, which is neutralized, consists of soda, taken in an amount exceeding the calculated value by 10-30%, of the target product or alkylolamide, which is taken in an amount of 30-70% by weight of soda, and water in an amount of 5 -30% by weight of soda. As alkylolamides, α-derivatives of aliphatic carbrinoic acids containing Cyu-Ci6 atoms and monoethanolamine are used.

The composition of the target product is expressed by the following average data,%:

Alkyl Sulphates 100% 60-65

Unsulfonated compounds 4-7 Sodium sulfate up to 20

Water5-7

Soda3-5

Sulfation depth is 85-90 pH 1% aqueous solution 6.5-8.0

Example 1. An oleum-urea complex is prepared by adding, at a temperature of 20-35 ° C, 29 kg of ground urea to 60 liters of 20% oleum.

The finished complex is added with stirring and cooling to 150 liters of higher alcohols Ci4-C20 so that the temperature does not exceed 40 ° C. The result is 265-270 kg of sulfoester.

105 kg of soda ash and 50-60 kg of previously obtained alkyl sulfates are loaded into the mixer, stirred for 10-15 minutes and 10 liters of water are added over 10 minutes with stirring. Acid alkyl sulfates are gradually added to the mixture during 1 hour. After deducting the previously added alkyl sulfates and the liberated carbon dioxide, about 350 kg of the desired product is obtained.

Example 2. Get sulfoether as described in example 1. In the mixer load 105 kg of soda ash and 50-60 kg of alkylolamides.

After a smooth mass is obtained (after 5-10 minutes), 15 liters of water are added evenly

for 10 min with stirring. Acid alkyl sulphates are evenly fed to the resulting mixture at such a rate that neutralization is complete after 1 hour. Get about 400 kg of the target product.

Subject invention

Claims (3)

1. A method for producing alkyl sulfates by sulfating higher alcohols containing Cu-C20 atoms with a sulfating agent, such as an oleum-urea complex, and neutralizing the resulting acid alkyl sulfates with subsequent isolation of the target product by a known technique, characterized in that, in order to increase the purity of the target product, alkyl sulfates are neutralized by adding them to a mixture of soda ash, the desired product or alkylolamide and water. 2. A method according to claim 1, characterized in that the neutralization of acid alkyl sulfates is a mixture of soda, taken in an amount exceeding the calculated by 10-30%, with the target product, taken in an amount of 30-70% by weight of soda and water in an amount of 5-30% by weight of soda. 3. Method according to paragraphs. 1 and 2, characterized in that the neutralization of acidic alkyl sulfates is carried out with a mixture in which alkylolamides of aliphatic carboxylic acids containing Ciu-Cie atoms are used instead of the target product.