CNOOC diethylene glycol deg: Technological innovation and industrial application of polyester-grade antifreeze raw materials
Publish Time: 2025-05-06
In the field of chemical materials, CNOOC diethylene glycol deg is becoming the core raw material for antifreeze, plasticizers and gas dehydrating agents with its polyester-grade purity and multifunctional characteristics. With 99.9% high purity as its core advantage, the product controls the impurity content below 5ppm through molecular sieve adsorption and distillation coupling technology, far exceeding the national standard GB/T 4649-2018 for industrial-grade diethylene glycol. It shows excellent stability in a wide temperature range of -10℃ to 245℃, making it an ideal choice for new energy vehicle thermal management systems and industrial cooling equipment.
In the field of antifreeze, CNOOC diethylene glycol deg has achieved performance breakthroughs by optimizing its molecular structure. Its hydroxyl distribution density is 20% higher than that of traditional ethylene glycol, and it remains fluid at extremely low temperatures of -40℃, and its freezing point is 15℃ lower than that of ethylene glycol-based antifreeze. The measured data of a commercial vehicle fleet showed that the antifreeze prepared with this raw material can shorten the engine start-up time by 40% and reduce the corrosion rate of the cooling system from 0.05mm/a to 0.01mm/a. In the thermal management of new energy vehicle batteries, its compounding scheme with propylene glycol keeps the temperature difference of the battery pack within ±2℃, which is 35% more efficient than the traditional water-based coolant.
The polyester grade characteristics make it outstanding in the field of plasticizers. CNOOC DEG significantly improves the low-temperature toughness of PVC products by controlling the molecular weight distribution (Mw=106±2). The sheath material produced by a cable company using this raw material has an elongation retention rate of 85% at break at -30℃, which is 25 percentage points higher than the ordinary plasticizer solution. In the synthesis of unsaturated polyester resin, its double bond reaction activity is 40% higher than that of monoethylene glycol, which shortens the resin curing time to 60% of the traditional formula, and at the same time increases the bending strength to 120MPa, meeting the needs of high-end applications such as wind turbine blades.
Gas dehydration process is another technical highland of CNOOC DEG. Through microchannel reactor technology, its dehydration efficiency is increased by 50% compared with traditional tower equipment, and a breakthrough in the field of natural gas dehydration is achieved by reducing the dew point from -5℃ to -60℃. Data from a certain LNG receiving station shows that the dehydration device using this raw material reduces BOG emissions by 30%, saving more than 10 million yuan in annual operating costs. In the aromatics extraction process, its selectivity coefficient reaches 15, which is 3 times higher than that of cyclopentane solvent, making the purity of benzene products stable at more than 99.98%.
Environmental protection and safety performance expand the application boundaries of products. CNOOC DEG has a biodegradation rate of 78%, passed the OECD 301F standard certification, and its half-life in soil is shortened to 45 days. Its acute oral toxicity LD50>5000mg/kg, which is two orders of magnitude lower than ethylene glycol, and has been registered under the EU REACH regulations. In the textile printing and dyeing industry, when used as a softener, it can reduce the electrostatic voltage of fabrics from 5kV to 0.8kV, and at the same time improve the color fastness by 1 level.
From the perspective of the market structure, CNOOC has achieved an annual production capacity of 200,000 tons by relying on the Nanhai Petrochemical Base, and reduced logistics costs by 30% through the direct pipeline supply model. The 220kg steel barrel packaging solution it developed has reduced the packaging cost per ton by 45%, and its market share in East China and South China has exceeded 35%. With the growth of heat dissipation demand for new energy vehicles and 5G base stations, the application of this raw material in the field of electronic coolants is expanding at a rate of 25% per year, and its compounding technology with nanofluids has entered the pilot stage.
In the context of the green transformation of chemical materials, CNOOC's diethylene glycol deg reconstructs the industrial value chain through technological innovation. It not only solves the pain points of low purity and narrow application range of traditional diethylene glycol, but also opens up a high-end market through polyester grade standards, becoming a key link between basic chemicals and advanced manufacturing. With the breakthrough of molecular-level purification technology, the application potential of this raw material in emerging fields such as biopharmaceutical carriers and phase change energy storage materials is accelerating.
