Composite low-temperature coolant and preparation method and applications thereof

A cold storage agent and low-temperature technology, applied in applications, chemical instruments and methods, food preservation, etc., can solve the problems of low latent heat of phase change, low thermal conductivity, and affecting cold storage capacity, and achieve low cost, simple preparation method, and cold storage effect Good results

Active Publication Date: 2015-06-24
南京久鼎环境科技股份有限公司
View PDF7 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, inorganic cooling agents are widely used, and the most well-known one is ice. Ice storage has a certain effect, but it is mainly suitable for products stored at around 0°C. If you want to store products at lower temperatures, you need to use other inorganic salts. Many inorganic substances The phase change cold storage agent has the disadvantages of supercooling and phase separation during the phase change process, which affects the cold storage capacity
Organic phase-change cold storage materials mainly include fatty acids and their esters, alcohols, aromatic hydrocarbons, and high-molecular polymers. The chemical properties of organic matter are stable and there is no disadvantage of phase separation, but the thermal conductivity is low and the latent heat of phase change is low.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of a composite low-temperature cold storage agent, the specific steps are as follows:

[0021] 1) Prepare 7.5g of ethylene glycol, 5.75g of ammonium chloride, 5.0g of sodium chloride, 4.75g of calcium chloride, 1g of guar gum, 0.3g of citric acid, 1.5g of sodium tetraborate, and 74.2g of water according to the mass percentage;

[0022] 2) Mix ethylene glycol, calcium chloride, and water to form an aqueous solution;

[0023] 3) Mix ammonium chloride, sodium chloride, guar gum, citric acid, and sodium tetraborate and grind them thoroughly to obtain a mixture;

[0024] 4) Add the mixture in step 3) to the aqueous solution in step 2), and stir at a high speed. Keep the temperature at about 50°C while stirring. After stirring evenly, let it stand for cooling to obtain the cooling agent. After testing, its phase transition temperature is -34.6°C, and its latent heat of phase transition is 315 kJ / kg.

Embodiment 2

[0026] A preparation method of a composite low-temperature cold storage agent, the specific steps are as follows:

[0027] 1) Prepare 7.5g of ethylene glycol, 4.8g of ammonium chloride, 4.6g of sodium chloride, 4.8g of calcium chloride, 1g of guar gum, 0.3g of citric acid, 1.25g of sodium tetraborate, and 75.75g of water according to the mass percentage;

[0028] 2) Mix ethylene glycol, calcium chloride, and water to form an aqueous solution;

[0029] 3) Mix ammonium chloride, sodium chloride, guar gum, citric acid, and sodium tetraborate and grind them thoroughly to obtain a mixture;

[0030] 4) Add the mixture in step 3) to the aqueous solution in step 2), and stir at a high speed. Keep the temperature at about 50°C while stirring. After stirring evenly, let it stand for cooling to obtain the cooling agent. After testing, its phase transition temperature is -35.3°C, and its latent heat of phase transition is 355 kJ / kg.

Embodiment 3

[0032] A preparation method of a composite low-temperature cold storage agent, the specific steps are as follows:

[0033] 1) Prepare 7.5g of ethylene glycol, 6.3g of ammonium chloride, 4.6g of sodium chloride, 4.8g of calcium chloride, 1g of guar gum, 0.3g of citric acid, 1.25g of sodium tetraborate, and 74.25g of water according to the mass percentage;

[0034] 2) Mix ethylene glycol, calcium chloride, and water to form an aqueous solution;

[0035] 3) Mix ammonium chloride, sodium chloride, guar gum, citric acid, and sodium tetraborate and grind them thoroughly to obtain a mixture;

[0036] 4) Add the mixture in step 3) to the aqueous solution in step 2), and stir at a high speed. Keep the temperature at 50°C while stirring. After stirring evenly, let it stand for cooling to obtain the cooling agent. After testing, its phase transition temperature is -36.1°C, and its latent heat of phase transition is 335 kJ / kg.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
phase transition temperatureaaaaaaaaaa
phase transition enthalpyaaaaaaaaaa
phase transition temperatureaaaaaaaaaa
Login to view more

Abstract

The invention discloses a composite low-temperature coolant which is composed of the following components in percentage by mass: 7-12% of ethylene glycol, 3-6.3% of ammonium chloride, 3-7% of sodium chloride, 4-7% of calcium chloride, 0.05-2% of guar gum, 0.1-0.5% of a citric acid, 1-3% of sodium tetraborate and the balance of water. The invention also discloses a preparation method of the composite low-temperature coolant. The invention also discloses the applications of the composite low-temperature coolant on the aspects of storage and freshness preservation. The preparation method of the composite low-temperature coolant disclosed by the invention is simple, low in cost, and suitable for mass production, and the prepared coolant is good in cool storage effect and can be used repeatedly. Experiments show that the phase transition temperature of the coolant is 34 DEG C below zero-38 DEG C below zero, and the latent heat of phase change is 310-355 kJ / kg.

Description

technical field [0001] The invention relates to the field of cold storage agent preparation, in particular to a composite low-temperature cold storage agent and its preparation method and application. Background technique [0002] With the development of society and the improvement of people's living standards, people's requirements for the quality of fresh food and other products are also increasing. Therefore, food storage and preservation technology is particularly important in cold chain logistics. With the development of domestic cold chain logistics, the research on cold storage technology has gradually deepened, and the research on cold storage agent is also being carried out as a hot spot. The purpose of cold storage is achieved by absorbing or releasing a large amount of heat during the phase change process of cold storage agent. [0003] According to literature records, the current low-temperature cooling agents are mainly divided into: organic cooling agents and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06A23L3/37
CPCA23L3/37C09K5/06Y02E60/14
Inventor 周荣辉赵东华刘飞云高海素
Owner 南京久鼎环境科技股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap