SU405868A1 - METHOD OF OBTAINING N-ACYLATED AMINO ACIDS - Google Patents

Description

one

The invention relates to a method for producing N-ad. Or amino acids of the general formula

.0

C

N- (CH) -COOH H

where R is the residue O) to acids Xyu-Gig

p used in flotation of pesulfide

The known method for the preparation of the surfactant substance "medialan - a product of condensation of acid chloride-acid acids with sarcosine, which is an effective flotation reagent. However, these compounds are scarcely available, since expensive and scarce raw materials (oleic acid, coconut oil, sarkozy) are used to synthesize them, and technical technologies of production are complex and multistage.

The proposed procedure for the preparation of N-acylated amino acids consists of IB condensation of essential oils of acid with apr, ammonium salt of acetic acid, followed by hydrolysis and isolation of the target product in a known manner. The reaction proceeds according to the scheme::.

UNCS-XH CH COO a-KCONHCH-zCOONO + H.O

Amino acetic acid sodium salt is obtained by treating monochloroxy acid with ammonia, followed by neutralization with caustic soda.

As fatty acids, fatty acid can be used: a fraction of tall oil, light oil (butyl oil from the processing of tall oil), and synthetic fatty acids of 1 ACID.

The fatty acid fraction of tall oil used for the synthesis contains 90.5% fatty acids (the acid number of the fraction is 177.4).

Fatty acids of tall oil heated to 120 ° C are added while mixing hot saturated aqueous solution of the sodium salt of aminoacetic acid taken with a 20% excess (per 10 g of acid, 1.1 g of sodium aminoadetate) is heated to 195 ° C and maintain p, p, and this temperature is 3.5 hours. After cooling, a solid (14 g), well soluble in water, is obtained.

The resulting reagent contains as

| nr.i, mesyay a small amount of free

fatty acids and their soaps, inactive substances contained in the original fatty acid fraction, amino acetate, sodium chloride AND decomposition products formed during the reaction. .

The resulting product received a "name" talacet. The content of the main story in various parties of talaceta is 45-55%.

ripiH flotation of a hubnerite tungsten-containing mineral from sludge extracted from the process of gravity-ore ore dressing, using talaceta as a collector, recovered tungsten trioxide in concentrate is 5% higher than with sodium oleate. At that, the quality of the concentrate is also somewhat higher, and the consumption of talacetate is 25% less than that of sodium oleate.

During flotation of tailings of magnetic enrichment of iron ore in the presence of talaceth, concentrate of the same quality is obtained as when using tall oil, but the recovery factor is higher.

Thus, the proposed method is simple to implement, is based on the use of relatively inexpensive and available raw materials, the resulting reagent is very effective in flotation, the sodium aminoadetate used can be used without purification; , -and from primes of sodium chloride.

The subject is invented and

The method of obtaining N-acylated amino acids of the general formula

. "

C

K-ICH J-COOH n

where R is the residue of fatty acids Sue-Cig;

P1-b, characterized in that the higher fatty acids are condensed with the sodium salt of a: Minoacetic acid, followed by hydrolysis and the isolation of the target product by a known method m.