ENVIRONMENTAL FRIENDLY ELECTRICALLY INSULATING FLUID AND PROCESS FOR PREPARING THE SAME

• Main Authors: LINGVAY IOSIF, ŞERBAN FLORENTINA FĂNICA, STANOI VALERICA, OPRINA GABRIELA, VOINA ANDREEA, PICA ALEXANDRA, UNGUREANU LIVIA-CARMEN
• Format: Patent
• Language: English; Romanian
• Published: 28.12.2018
• Subjects: CHEMISTRY; FUELS; LUBRICANTS; LUBRICATING COMPOSITIONS; METALLURGY; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION

The invention relates to a process for preparing an electrically insulating fluid intended for mixed solid/liquid insulations in electrical equipments. According to the invention, the process consists in thermally treating raw vegetable oil containing 5%, at the most, fatty acid esters, such as linoleic acid or linolenic acid, and at least 90% monounsaturated fatty acid esters, such as oleic acid, and saturated fatty acid esters, such as stearic acid, in a ratio of 5:1, at 125...135°C, for 3...5 h, followed by a primary dehydration on silica gel, up to a moisture content of 50 ppm, at the most, after which 0.5...0.9% butanol is added, the mixture is thermally treated at a temperature of 115...125°C, for 4...6 h, and at the ambient temperature, with silica gel, up to a moisture content of 30 ppm, at the most, to finally obtain, after filtration, a fluid having a dielectric rigidity of at least 45 kV/cm, a flammability point of at least 250°C and fast biodegradability in natural conditions. Invenţia se referă la un procedeu de obţinere a unui fluid electroizolant utilizat pentru realizarea izolaţiilor mixte solid/lichid din echipamente electrice. Procedeul, conform invenţiei, constă în tratarea termică a uleiului vegetal crud având maximum 5% esteri ai acizilor graşi de tip acid linoleic sau acid linolenic şi minimum 90% esteri ai acizilor graşi mononesaturaţi de tip acid oleic şi saturaţi, de tip acid stearic, într-un raport de 5:1 la 125...135°C timp de 3...5 h, urmată de o deshidratare primară pe silicagel până la maximum 50 ppm conţinut de umiditate, după care se adaugă 0,5...0,9% butanol, amestecul se tratează termic la temperatura de 115...125°C timp de 4...6 h, şi la temperatura ambiantă cu silicagel până la maximum 30 ppm conţinut de umiditate, după filtrare rezultând un fluid având o rigiditate dielectrică de minimum 45 kV/cm, un punct de inflamabilitate de minimum 250°C, şi o biodegradabilitate rapidă în condiiţii naturale.