METHOD OF TWO-STAGE THERMAL REGENERATION OF WASTE INDUSTRIAL FLUIDS Russian patent published in 2020 - IPC B01D1/22 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to petrochemical and gas industry, in particular to methods of separation and purification of waste process fluids, such as amines, glycols, motor, turbine and transformer oils. Method of two-stage thermal regeneration of waste process fluids including feeding liquid into upper part of film evaporator No.1, into annular space of which flue gases are supplied from burner for heating of heat exchange tubes of evaporator, through which regenerated liquid drains by uniform layer, which provides evaporation of a large portion of the end product, and the remaining portion of the end product with contained contaminants flows to the bottom part of the evaporator, where the vapor is separated and removed from the bottom part of the evaporator No.1, and still liquor is removed and mixed with stilling liquor of rectification column, in which heavy components are condensed owing to reaction with the distillate flowing from the distillation column head, after which the obtained mixture is separated into 2 streams, wherein first is mixed with fresh raw material and supplied to film evaporator No.1, thus providing internal circulation of raw material with low content of heavy products, and second in upper part of film evaporator No.2, into annular space of which flue gases are supplied from burner for heating of heat exchanging tubes of evaporator, through which regenerated liquid drains by uniform layer, which provides evaporation of greater part of target product, and the remaining part of the end product with high content of contaminants flows into the bottom part of the evaporator, where also pairs are coming, where the pairs are separated and withdrawn from the bottom part of evaporator No.2, and still liquor is removed and most of it is mixed with feedstock of evaporator No.2 and is directed to film evaporator No.2, thus providing internal circulation of raw material with high content of heavy products, and balance excess of bottom product of evaporator No.2 is removed from plant in form of heavy processing residue, at that, the target product pairs from the bottom part of the evaporator No.1 and the evaporator No.2 are supplied to the lower part of the rectification column for further purification from heavy components, are condensed in the refrigerator and collected in the product container, wherein in order to exclude the degraded product degradation processes from the thermal action and its repeated contamination with the osmosis products, the regeneration process is carried out at an absolute pressure of 1.0–90 kPa, which is created by means of vacuum pump connected to tank for collecting cleaned product, which enables to reduce operating temperature of process in evaporator No.1 and evaporator No.2 to 200–350 °C depending on type of processed raw material.

EFFECT: higher efficiency of regeneration unit for waste industrial fluids while maintaining quality of purification of end product.

1 cl, 1 dwg