Demulsifying agents for crude oil based on random alkylacrylic-aminoalkylacrylic-carboxyalkylacrylic terpolymers of controlled molecular mass

A synthesis of a random alkylacrylic-aminoacrylic-carboxyacrylic terpolymer, wherein the random alkylacrylic-aminoacrylic-carboxyacrylic terpolymer is employed as demulsifying agent of crude oil, with API densities from 3 to 40° API, and comprises structural formula (1) and molecular masses within 1,200 and 664,200 g·mol−1:

• where:
• R1, R2, R3, R4, R5 and R6 are independent radicals, represented by the groups mentioned below:
• R1=an aliphatic chain selected from the group consisting of CH3 (methyl), C2H5 (ethyl), C4H9 (n-butyl), C4H9 (iso-butyl), C4H9 (tert-butyl), C5H11 (pentyl), C6H13 (n-hexyl), C6H11 (di(ethyleneglycol)ethylether), C8H17 (2-ethylhexyl), C9H19 (3,5,5-trimethylhexyl), C8H17 (n-octyl), C8H17 (iso-octyl), C8H9 (ethyleneglycol phenylether), C10H21 (n-decyl), C10H21 (isodecyl), C10H19 (10-undecenyl), C10H19 (tert-butylciclohexyl), C12H25 (n-dodecyl), C18H37 (n-octadecyl), C8H9O (2-phenoxyethyl), C3H7O (2-methoxyethyl), C5H11O2 (2-(2-methoxyethoxy)ethyl), C5H9O (tetrahydrofurfuryl), C5H9O (2-tetrahydropyranyl), C13H27 (tridecyl), and C22H45 (behenyl), wherein the aliphatic chain can contain heteroatoms as ether groups, as well as aromatic fragments like benzene rings;
• R2═CH4N (methylamine), C3H6N (2-ethylamine), C3H8N (3-propylamine), C4H10N (2-(dimethylamino)ethyl), C6H14N (2-(diethylamino)ethyl), C5H12N (3-(dimethylamino)propyl), and C6H12NO (N-morpholinyl ethyl);
• R3═C3H5O2 (2-carboxyethyl), C4H7O2 (3-carboxypropyl), and C5H9O2 (carboxybutyl);
• R4, R5 and R6═H (hydrogen), CH3 (methyl);
• and where:
• x, y, and z are natural numbers within the following ranges:
• x=from 4 to 900;
• y=from 4 to 900;
• and
• z=from 4 to 900;
• and
• wherein “x”, “y”, and “z” could appear as random sequences.