METHOD OF RECYCLING ORGANOCHLORIDE WASTES FROM CHEMICAL PRODUCTION FOR PRODUCING MODIFYING ADDITIVES FOR BITUMEN AND MODIFYING ADDITIVE FOR BITUMEN Russian patent published in 2009 - IPC C07C17/25 A62D3/00 C07G1/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of recycling organochloride wastes from chemical production through their condensation in mild conditions in the presence of sodium polysulphide, obtained from reacting sodium sulphide with sulphur and NaOH, while heating to temperature from 60 to 95°C for 3 to 4 hours with hydrolysed lignin which has been activated by mono- or multiple chlorination with chlorine water which contains 7.0-14.0 active chlorine per 1 dm³ of water, with subsequent acidification of the reaction medium and separation of the condensation product through filtering. The invention also relates to a modifying additive for bitumen, which is a product of condensation, whose components are in the following ratio (in wt %): sodium sulphide (anhydrous) 9.55-20.50; sulphur 1.97-8.46; sodium hydroxide 6.65-8.45; organochloride wastes from chemical production 9.83-26.40; hydrolysed lignin which has been activated by mono- or multiple chlorination with chlorine water - up to 100.

EFFECT: increased selectivity and efficiency of the process of bonding toxic organochloride compounds with lignin, obtaining a modifying additive for bitumen with high compatibility of lignin with bitumen.

3 cl, 2 tbl, 2 ex