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A kind of sustained-release process of refrigerant ethylene glycol

A technology of ethylene glycol and brine, which is applied in the field of coal chemical industry, can solve the problems of shortening the service life of corrosion inhibitors, reducing efficiency, and being unable to remove, so as to avoid the reduction of heat exchange efficiency, prolong the service life, and reduce equipment corrosion Effect

Active Publication Date: 2016-05-25
JINNENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of prior art scheme: although triethanolamine has very good corrosion inhibition effect, but there are two shortcomings, the one, can't remove the Fe dissolved in the secondary refrigerant ethylene glycol 3+ , colloid and impurity precipitates will be deposited in the heat exchanger and pipes, which will deteriorate the heat transfer and greatly reduce the efficiency; second, the ethanol generated in the case of relatively bad working conditions or the presence of oxygen will be further oxidized and acidified, instead Shorten the service life of the corrosion inhibitor, which is very uneconomical

Method used

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  • A kind of sustained-release process of refrigerant ethylene glycol
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  • A kind of sustained-release process of refrigerant ethylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put the ethylene glycol solution with a concentration of 20% from the workshop into the neutralization tank, start stirring, and add 5kg of composite carbonate per 1000kg of ethylene glycol. The composite carbonate is potassium carbonate, ammonium bicarbonate, carbonic acid A mixture of ammonium, wherein the weight ratio of potassium carbonate, ammonium bicarbonate, and ammonium carbonate is: 3.0:4.5:0.6, for neutralization, the stirring speed is required to be controlled at 60r / min, stirred for 2 hours, and absorbed by the ethylene glycol solution [H] + , reduce the concentration of hydrogen ions in the ethylene glycol aqueous solution, and increase the pH value of the ethylene glycol solution; use carbonate and Fe dissolved in the ethylene glycol solution 3+ A double hydrolysis reaction occurs to form Fe(OH) 3 Colloid, Fe(OH) 3 The colloid continuously adsorbs impurities in the refrigerant ethylene glycol solution, and finally flocculates under the action of carbona...

Embodiment 2

[0022] Put the ethylene glycol solution with a concentration of 40% from the workshop into the neutralization tank, start stirring, and add 10kg of compound carbonate for every 1000kg of ethylene glycol for neutralization. The compound carbonate is potassium carbonate and bicarbonate The mixture of ammonium and ammonium carbonate, wherein the weight ratio of potassium carbonate, ammonium bicarbonate and ammonium carbonate is: 4.5:7.0:2.6, the stirring speed is required to be controlled at 100r / min, stirring for 2 hours, by absorbing [ H] + , reduce the concentration of hydrogen ions in the ethylene glycol aqueous solution, and increase the pH value of the ethylene glycol solution; use carbonate and Fe dissolved in the ethylene glycol solution 3+ A double hydrolysis reaction occurs to form Fe(OH) 3 Colloid, Fe(OH) 3 The colloid continuously adsorbs impurities in the refrigerant ethylene glycol solution, and finally flocculates under the action of carbonate cations; put the re...

Embodiment 3

[0024] Put the ethylene glycol solution with a concentration of 30% from the workshop into the neutralization tank, start stirring, and add 7.5kg of compound carbonate per 1000kg of ethylene glycol for neutralization. The compound carbonate is potassium carbonate, carbonic acid The mixture of ammonium bicarbonate and ammonium carbonate, wherein the weight ratio of potassium carbonate, ammonium bicarbonate and ammonium carbonate is: 4.0:5.5:2.0, the stirring speed is required to be controlled at 80r / min, and the stirring is carried out for 2 hours. [H] + , reduce the concentration of hydrogen ions in the ethylene glycol aqueous solution, and increase the pH value of the ethylene glycol solution; use carbonate and Fe dissolved in the ethylene glycol solution 3+ A double hydrolysis reaction occurs to form Fe(OH) 3 Colloid, Fe(OH) 3 The colloid continuously adsorbs impurities in the refrigerant ethylene glycol solution, and finally flocculates under the action of carbonate catio...

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Abstract

The invention belongs to the technical field of coal chemical industry, and in particular relates to a slow-release process of the refrigerant ethylene glycol. First, compound carbonate is added to ethylene glycol aqueous solution for double hydrolysis reaction. After the reaction, Fe(OH)3 colloid is formed. The colloid is continuously condensed under the dual action of impurities suspended in the refrigerant and compound carbonate anions and cations. A precipitate is formed, and the colloid and impurities in the brine are separated by standing and settling for 24 hours. After complete stratification, the supernatant is drawn out, and the lower layer of sediment is filtered by a filter device. While adjusting the pH value, it can effectively remove Metal ions and impurities in the brine are removed, and the purpose of neutralization and purification is finally achieved. The filtered clear liquid is sent to the brine system for reuse, and there is no loss or waste. Because the price of triethanolamine is relatively expensive, which limits its wide application, the use of composite carbonate as a corrosion inhibitor reduces the cost by more than 30% year-on-year, and has a very broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a slow-release process of the refrigerant ethylene glycol. Background technique [0002] Ethylene glycol is a colorless, slightly viscous liquid with a boiling point of 197.4°C and a freezing point of -11.5°C. It can be mixed with water in any proportion. After mixing, due to the change of the vapor pressure of the cooling water, the freezing point is significantly lowered. When the content of ethylene glycol is 68%, the freezing point can be lowered to -68°C. It is the most commonly used refrigerant at present. [0003] However, ethylene glycol itself has a dihydroxy structure, and its stability is relatively poor. After being dissolved in water, some [H] + Ionization causes the aqueous solution of ethylene glycol to be acidic, and the pH value is usually between 5.5-6.0, which is weakly acidic. During use, due to temperature changes and the presence ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/10
Inventor 王恩龙李英法李计增韦天良刁兴伟
Owner JINNENG SCI & TECH