Industrial cold-carrying heat-transfer medium

Abstract

The invention relates to a novel industrial cold-carrying heat transfer medium. The heat transfer medium is used as a secondary refrigerant or a heat transfer agent in an indirect heat transfer system in the industrial production field. The heat transfer medium mainly comprises 5 and 70 weight percent of C1-C3 organic acid salt, 0.1 to 9 weight percent of corrosion inhibitor, 0 to 1 weight percent of antisludging agent and 20 to 94.9 weight percent of water. The product of the heat transfer medium is nontoxic, nonvolatile and non-flammable, does not corrode metals, simultaneously has good fluidity at a low temperature, is a heat transfer medium with superior and safe heat transfer property, and has the characteristics of cold carrying, heat transfer, corrosion inhibition and bacteriostasis; and the heat transfer medium can be prepared into 70 weight percent of concentrated solution, can be diluted into different concentrations by water according to the technological temperature requirements, and is suitable for being used as the cold-carrying heat transfer medium in the industrial field at a temperature of between 50 DEG C below zero and 100 DEG C.

Description

technical field [0001] The invention belongs to a heat transfer medium for industrial production, and is especially used as a refrigerant in the indirect heat transfer system of chemical production and pharmaceutical synthesis process. Background technique [0002] In many industrial production fields such as chemical industry and pharmacy, it is closely related to temperature, including high temperature, low temperature, endothermic reaction, and exothermic reaction. In order to keep the temperature of the system always in the state required by the process conditions, it is actually accomplished by transferring heat into or out of the serpentine tube inside the reactor or the heat transfer agent flowing in the interlayer outside the reactor. Commonly used heat transfer media are inorganic salt aqueous solution and alcohol aqueous solution. These aqueous heat transfer media have poor heat transfer performance and serious corrosion to metal materials. On the one hand, these ...

AI Technical Summary

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.

US Dow coolant (trade name DOWTHERM TM SR-1 and DOWFROST TM ) is a cooling medium with ethylene glycol and propylene glycol as the base material, adding a certain amount of anti-corrosion agent. This type of cooling agent has good anti-rust performance, but the viscosity of its aqueous solution will increase dramatically when it is below -30°C , the fluidity decreases, which limits its scope of application

[0004] Reference document Patent Publication No.: 10-228382 titled "High Temperature Water Resistance Salt Composition" discloses a brine composition using glycols or glycerol as the main body, with a content of 30-90%, preferably 50-80% , but in practical application, the following situation will occur: if the polyol content is too low (below 30%), the freezing point of the aqueous solution will be very high, and the low temperature state that does not reach the system requirements will freeze; when the polyol content >80%, the viscosity of the solution will rise rapidly at low temperature (below 0°C), and the fluidity will drop sharply. Therefore, this type of single polyol composition is not suitable for recycling at low temperature, and is only suitable for high temperature circulation systems. (Just like automobile antifreeze, it can be used repeatedly at higher temperatures, and it can be kept free from freezing when it is in a low-temperature static state), not suitable for low-temperature cycle applications

[0005] 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