LIQUID HEAT CARRIER Russian patent published in 1999 - IPC

FIELD: heat-exchanges processes. SUBSTANCE: heat carrier contains ethylene glycol, water, sodium tetraborate and, additionally, 4:1 mixture of high-boiling fraction with morpholine or 4:1 diethylamine-morpholine mixture, said high- boiling fraction being mixture of by-products from the stage of rectified morpholine isolation from catalysate in the process of production of morpholine from diethylene glycol and ammonia. EFFECT: increased heat resistance in the temperature range from minus 28-72 C to plus 205-245 C and reduced corrosive effect to carbon steel structural materials, and prevented foam formation. 3 tbl