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Salt coated with nanoparticles

A nanoparticle and particle technology, applied in the field of particles, can solve the problems of water evaporation, easy cracking, and it is difficult to obtain a fully reversible process, and achieve the effect of eliminating corrosion and improving long-term stability.

Active Publication Date: 2013-12-04
克莱米特威尔上市有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One problem with the structure of dry water is that it tends to crumble when heated, causing the water to evaporate
Therefore it is difficult to obtain a fully reversible process

Method used

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  • Salt coated with nanoparticles
  • Salt coated with nanoparticles
  • Salt coated with nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] In one experiment 95 parts of an aqueous solution of LiBr (32 wt%) was poured into an OBH Noordica type 1.5 L mixer and 5 parts of a hydrophobic silica derivative was added to the saline solution. Mixing was carried out at >10000 rpm in 3 time intervals, each time interval lasting about 30 s. The resulting material was a dry and free-flowing white powder. The nanoparticle-coated salt is then heat-treated.

Embodiment 2

[0094] Example 2 - Corrosivity to Copper, Steel and Aluminum

[0095] Nanoparticle-coated salt prepared according to Example 1 above. The original LiBr content in the aqueous solution was 32 wt%.

[0096] A spoonful of nanoparticle-coated salt was placed on three different metals:

[0097] copper

[0098] steel

[0099] aluminum

[0100] The metal was heated at 300°C for about 1 hour in an oven under atmospheric conditions.

[0101] For comparison, a 32 wt% lithium bromide aqueous solution was poured on a copper plate and heated on a hot plate (below 300°C) for about 15 minutes.

[0102] Corrosion quickly occurred on the copper sheet when using an aqueous salt solution. A blue / green oxidation product became very clear and formed a hole in the plate. The copper sheets exposed to the nanoparticle-coated salt did not show any signs of corrosion.

[0103] Metal sheets of steel and aluminum also did not show any signs of corrosion when exposed to the nanoparticle-coated s...

Embodiment 3

[0104] Example 3 - Reversibility of nanoparticle-coated salts when used in an absorption process

[0105] The nanoparticle coated salt was prepared according to Example 1 above. The original LiBr content in the aqueous solution was 32 wt%. 50 g of nanoparticle-coated salt was added to a small scale reactor, and the nanoparticle-coated salt contained 34 g of water. The reactor is connected to the condenser / evaporator via a gas delivery channel. Add 100 g of water to the condenser / evaporator.

[0106] The absorber was charged by heating the reactor to 120-150°C over 4-12 hours using cooling fins at about 6°C on the side of the condenser / evaporator.

[0107] The absorber was released by heating the condenser / evaporator with approximately 25-30°C cooling fins attached to the reactor to 17°C.

[0108] During the charging process, moisture evaporates from the nanoparticle-coated salt and is transported as water vapor to the condenser / evaporator where it condenses to form pure li...

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Abstract

A salt or CaO coated with hydrophobic nanoparticles comprises an inner part and an outer coating, forming a particle with a permeable membrane keeping liquid inside and letting gas pass. Said inner part comprises at least one selected from a salt and CaO and said outer coating comprises hydrophobic nanoparticles. Known machines and processes can get enhanced functionality the particles comprising salt and nanoparticles. For machines working according to matrix and hybrid principles the particles can act as a matrix, thereby substituting expensive matrix material. Further applications include storage of chemical energy. A device is adapted to perform an absorption process, said device comprising at least one particle. Advantages include that corrosion is reduced or even eliminated. The long term stability of absorption machines is increased and migration of salt in liquid and gas phase is avoided.

Description

technical field [0001] The present invention relates to a particle comprising an inner portion and an outer coating, and also to a device comprising the particle. The inner part comprises at least one selected from salt and CaO and the outer coating comprises hydrophobic nanoparticles. The device is suitable for carrying out absorption processes. Examples of such devices include, but are not limited to, absorption chemical heat pumps. Background technique [0002] Salts in combination with other substances comprising silica are known. US 5,753,345 discloses an adsorbent for the exchange of moisture and odorous gases. Silica sol was coated on the sheet to obtain an adsorbent. The diameter of the above-mentioned silica particles is less than 120A, and there are a large number of stable silanol radicals on the surface, which has a strong binding ability. The above-mentioned silica sol optionally contains a moisture absorbent such as lithium salt, magnesium salt and calcium...

Claims

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Application Information

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IPC IPC(8): F25B17/08B01D53/26B01D53/28C09K5/00F25B17/12
CPCB01J20/3219B01J20/04C09K5/00B01D53/28C09K5/16B01J20/28057B01J20/3293B01J20/041B01J20/103B01J20/324B01J20/3204B01D2251/404B01J20/30B01J20/28004B01J20/00B01J20/3236F25B17/08B01D2252/10B01J20/28011B01J20/3287B01J20/045B01J20/046B01J20/265B01J20/28016Y02E60/14Y10T428/2991B01D53/26B01J20/02F25B17/12F24F3/1411F28D20/003
Inventor 格兰·博林德米特里·格列博夫
Owner 克莱米特威尔上市有限公司
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