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Industrial secondary refrigerant

A refrigerant and industrial technology, applied in the field of heat transfer medium for industrial production, can solve the problems of decreased fluidity, increased viscosity of aqueous solution, limited application range, etc., and achieves inhibition of metal oxidation, good fluidity, and safe heat transfer. Effect

Active Publication Date: 2015-12-16
CHAOYANG GUANGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The weight composition of the refrigerant is as follows: 95% of propylene glycol methyl ether, 0.05% of sodium benzoate, 0.1% of sodium molybdate, 0.1% of benzotriazole, 2% of methanol and 2.75% of water. The freezing point of the brine is below -95°C, the viscosity is 73.4cP at -65°C, and it can be used at an ambient temperature of -65 to 115°C. Non-toxic, non-volatile, non-scaling, non-mildew, non-corrosive to metals, good fluidity at low temperature.

Embodiment 2

[0021] The weight composition of the refrigerant is as follows: 88% of propylene glycol butyl ether, 2.5% of sodium lactate, 0.1% of polyaspartic acid, 0.5% of benzotriazole and 8.9% of ethanol. The brine has a boiling point of 170°C and a freezing point of -100°C, and can be used at an ambient temperature of -50 to 165°C. Can be widely used in food, chemical, pharmaceutical and other fields.

Embodiment 3

[0023] The weight composition of the brine is: 50% of propylene glycol methyl ether, 42% of propylene glycol butyl ether, 0.5% of sodium phytate, 1% of sodium lactate, 0.2% of polyepoxysuccinic acid, 0.3% of benzotriazole and 6% of methanol. The brine has a freezing point of -80°C and can be used at a temperature of -60 to 150°C. It can be used in beer, food, pharmaceutical, silicone and petrochemical industries.

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Abstract

The invention relates to an industrial secondary refrigerant. The industrial secondary refrigerant is composed of, by weight, 80 to 99% of glycol alkyl ether or propylene glycol alkyl ether compounds, 0.1 to 5% of a corrosion scale inhibitor and 0.9 to 10% function-adjusting liquid. According to the invention, the secondary refrigerant is added with the environment-friendly corrosion scale inhibitor which is harmless to the environment and human body, and the corrosion scale inhibitor can adsorb on metal surface and forms a physical adsorption protective film, so dissolved oxygen is blocked from diffusion to the metal surface; meanwhile, a compact passivation antirust film is generated through oxidation reduction reaction of the corrosion scale inhibitor with the metal surface, so metal oxidation is inhibited; moreover, the industrial secondary refrigerant provided by the invention also selects and uses the glycol alkyl ether or propylene glycol alkyl ether compounds with low viscosity, so effects of cold carrying and heat exchanging are guaranteed. The industrial secondary refrigerant in the invention is suitable for being used as the secondary refrigerant applied in industry under minus 80 to 200 DEG C, and an indirect heat transfer system in chemical industrial production and medicinal synthesis process. The secondary refrigerant is non-toxic and harmless, has excellent and safe heat transfer property and good fluidity at low temperature, does not precipitate and scale, and has the characteristics of environmental protection, cold carrying, heat transfer, corrosion inhibition, bacterial inhibition, low viscosity, corrosion resistance, etc.

Description

technical field [0001] The invention belongs to the heat transfer medium used in industrial production, in particular to the industrial refrigerant used in the indirect heat transfer system of chemical production and pharmaceutical synthesis process. Background technique [0002] With the rapid development of industrial technology, refrigeration technology is widely used in chemical, pharmaceutical, food and other industries. The requirements for the carrier-brine as the transfer temperature are also getting higher and higher. Commonly used refrigerants are ethanol, ethylene glycol, propylene glycol aqueous solution and calcium chloride, sodium chloride aqueous solution. These brines not only severely corrode metal equipment and greatly shorten the service life of refrigeration equipment, but also have poor heat transfer performance, which affects the heat transfer effect. These problems have been restricting the development of the refrigeration industry. Aiming at the ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/10
Inventor 苏超陈锡良宋喆
Owner CHAOYANG GUANGDA CHEM
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