SU364603A1 - METHOD OF OBTAINING AMFOLITE - Google Patents

Description

one

This invention relates to a process for preparing ampholytic and versatile active substances that have a high surface activity over a wide range of pH.

The reaction of the interaction of secondary amino alcohols with dicarboxylic anhydrides with the formation of amidoesters is known. However, the compounds obtained do not possess amphola and mn and m in and with and with TB and m.

A method is proposed for the preparation of ampholytic surfactants-derivatives of L-a ;; kil- (3-aminoethanols of the general formula

R NH - CjH OCOYCOOHI HX

or

R - NH - CjH.OCOYCOON, where R-C «H,; -, S.HeNzz-;

УvjO - VjOj 6 4 1

I I X - Hal; MH, Na, NH,

the interaction of the higher secondary amino alcohol halide hydrate with dicarboxylic anhydride, for example phthalic anhydride, followed by excretion of the target product in free form or as a salt in a known manner.

The starting products are taken in a molar ratio of 1: 1.05-1.1. The reaction proceeds at a temperature of 100 ° C for maleic anhydride and at 120 ° C for phthalic anhydride for 1.5 hours to form acid esters. The action of alkalis, these compounds P1 can be converted to the corresponding amino acids

R - NH-C, H, OCOYCOOH

or alkali metal salts

R - NH - S.N OSOSOOM

where R, Y and M are as defined above.

The resulting esters of higher -alsh1l-p-amino alcohols and dicarboxylic acids possess

The ability to significantly reduce the surface patching of aqueous solutions in acidic, neutral and alkaline media.

The surface tension determined using a plate plate (Wilhelmy method) and RP with a certain concentrate for some compounds are listed in the table.