Low-viscosity ultra-low temperature two-way wide temperature brine
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A refrigerant and ultra-low temperature technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of metal material corrosion, poor heat transfer performance, affecting heat transfer effect, etc., to prolong the service life and prevent volatilization loss , good fluidity effect
Active Publication Date: 2017-07-04
CHAOYANG GUANGDA CHEM
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Problems solved by technology
These aqueous heat transfer media have poor heat transfer performance and are severely corrosive to metal materials. On the one hand, these defects affect the heat transfer effect, and on the other hand, greatly shorten the service life of refrigeration equipment, which has long restricted the development of the refrigeration industry.
[0004] In recent years, the LM series heat transfer medium (trade name Glacier Refrigerant) promoted in the Chinese market has excellent anti-rust performance and strong cooling capacity, and can be used at -100°C. However, this type of product has certain volatility and is used in food , The use of the pharmaceutical industry still lacks safety guarantees
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Embodiment 1
[0019] The weight composition of the refrigerant is as follows: 95% of diethylene glycol methyl ether, 0.05% of sodium benzoate, 0.1% of sodium molybdate, 2% of sodium nitrate, 0.1% of benzotriazole and 2.75% of water. The freezing point of the refrigerant is below -80°C, and the boiling point is above 190°C. It can be used as a refrigerant in the environment of -40-185°C. It is non-toxic, non-volatile, non-flammable, non-scaling, and non-mildew. It does not corrode metal, has good fluidity at low temperature, and is convenient for circulation and transportation.
Embodiment 2
[0021] The weight composition of the refrigerant is as follows: 88% of dipropylene glycol methyl ether, 2% of sodium nitrite, 0.6% of polyaspartic acid, 5% of ethanol, and 4.4% of water. The freezing point of the brine is below -80°C, the boiling point is above 185°C, the viscosity is 72.7cP at -70°C, and it can be used at an ambient temperature of -60 to 150°C. Non-toxic, non-volatile, non-flammable, non-scaling, non-mildew, non-corrosive to metals, good low temperature fluidity, can be widely used in food, chemical, pharmaceutical and other fields.
Embodiment 3
[0023] The weight composition of the refrigerant is as follows: 95% of diethylene glycol methyl ethyl ether, 1% of sodium molybdate, 1.5% of sodium nitrate, 0.1% of benzotriazole, 0.4% of S-carboxyethyl thiosuccinic acid, 2% of water %. The freezing point of the brine is below -80°C, the boiling point is above 176°C, the viscosity at -75°C is 68.88cP, and it can be used at the ambient temperature of -75-170°C. Non-toxic, non-volatile, non-flammable, non-scaling, non-mildew, non-corrosive to metals, good fluidity at low temperature.
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Abstract
The invention discloses a low-viscosity ultralow-temperature bidirectional wide-temperature secondary refrigerant. The low-viscosity ultralow-temperature bidirectional wide-temperature secondary refrigerant is a composition consisting of the following components in percentage by weight: 80%-99% of glycol alkyl ether compounds, 0.1%-9% of an corrosion inhibitor, 0-1% of a scale inhibitor and 0.9%-10% of functionality regulating liquid; the pH value of the composition is 8-10. The low-viscosity ultralow-temperature bidirectional wide-temperature secondary refrigerant is non-toxic, harmless and non-volatile, is not nonflammable and explosive and does not corrode metal equipment, so that the consumption is reduced, and the service life of the equipment can be prolonged; meanwhile, the low-viscosity ultralow-temperature bidirectional wide-temperature secondary refrigerant has very good fluidity at low temperature, is a safe heat transfer medium with an excellent heat transfer property, does not precipitate and scale and has the properties of cold carrying, heat transfer, corrosion inhibition and bacteria inhibition; the low-viscosity ultralow-temperature bidirectional wide-temperature secondary refrigerant suitable for being used as a cold-carrying and heat-transfer medium at (-75) to (240) DEG C in the industrial field and is very applicable to indirect heat transfer systems used in chemical industry production and medical synthesis processes.
Description
technical field [0001] The invention relates to a heat transfer medium for industrial production, in particular to an ultra-low temperature bidirectional wide-temperature energy-saving refrigerant used in indirect heat transfer systems in chemical production and pharmaceutical synthesis processes. Background technique [0002] In many industrial production fields such as chemical industry and pharmaceutical industry, it is closely related to temperature. There are high temperature, low temperature, endothermic reaction and exothermic reaction. In order to keep the system temperature at the state required by the process conditions, it is actually done by transferring heat in or out through the serpentine tube inside the reactor or the heat transfer medium flowing in the interlayer outside the reactor. Commonly used heat transfer media include aqueous solutions of inorganic salts and aqueous alcohols. These aqueous heat transfer media have poor heat transfer performance and a...
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