CA1046261A - Quaternary eutectic salt mixture containing lif - Google Patents
Quaternary eutectic salt mixture containing lifInfo
- Publication number
- CA1046261A CA1046261A CA204,991A CA204991A CA1046261A CA 1046261 A CA1046261 A CA 1046261A CA 204991 A CA204991 A CA 204991A CA 1046261 A CA1046261 A CA 1046261A
- Authority
- CA
- Canada
- Prior art keywords
- mol
- salt mixture
- lif
- mixture containing
- eutectic salt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000011833 salt mixture Substances 0.000 title claims abstract description 11
- 230000005496 eutectics Effects 0.000 title claims abstract description 5
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 1
- 238000005338 heat storage Methods 0.000 abstract description 4
- 239000011232 storage material Substances 0.000 abstract description 4
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 16
- 239000000203 mixture Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000004927 fusion Effects 0.000 description 4
- 239000000374 eutectic mixture Substances 0.000 description 3
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000012611 container material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
ABSTRACT
Heat storage material comprising an eutectic salt mixture wh1ch consists of about 44 mol.% of L1F, about 40 mol.% of KF, about 12 mol.% of NaF and about 4 mol.% of MgF2.
Heat storage material comprising an eutectic salt mixture wh1ch consists of about 44 mol.% of L1F, about 40 mol.% of KF, about 12 mol.% of NaF and about 4 mol.% of MgF2.
Description
` ~0~
The invention relates to materials which have a melting point between 400C and 500C, maximum melting heat and heat capacity and which do not attack usual container materials, for example nickel-chromium S steel.
Materials of this type may be used as heat storage materials, for example in solar power plants, in storage heaters and the like, as a heat transfer material, for example in nuclear reactors, and in salt baths for heat treatment.
A ternary eutectic mixture is known which melts at 454C and consists of 46.5 mol% of LiF, 42.0 molt ~
of KF and 11.5 mol.% of NaF.
In particular in power stations, for example solar power stations, such a material may be used in very large quantities. The comparatively high price and comparatively rarity of lithiumfluoride may become important factors under such conditions.
The present invention provides a salt mixture which has an eutectic melting point between 400C and 500C and is characterized in that it contains about 44 mol % of LiF, about 40 mol.% of KF, about 12 mol.% of NaF and 4 mol. % of MgF2. The melting point of this eutectic mixture is about 449C. The heat of fusion is about 167 cal/g and hence exceeds that of the eutec-tic mixture of LiF, KF and NaF (heat of fusion about
The invention relates to materials which have a melting point between 400C and 500C, maximum melting heat and heat capacity and which do not attack usual container materials, for example nickel-chromium S steel.
Materials of this type may be used as heat storage materials, for example in solar power plants, in storage heaters and the like, as a heat transfer material, for example in nuclear reactors, and in salt baths for heat treatment.
A ternary eutectic mixture is known which melts at 454C and consists of 46.5 mol% of LiF, 42.0 molt ~
of KF and 11.5 mol.% of NaF.
In particular in power stations, for example solar power stations, such a material may be used in very large quantities. The comparatively high price and comparatively rarity of lithiumfluoride may become important factors under such conditions.
The present invention provides a salt mixture which has an eutectic melting point between 400C and 500C and is characterized in that it contains about 44 mol % of LiF, about 40 mol.% of KF, about 12 mol.% of NaF and 4 mol. % of MgF2. The melting point of this eutectic mixture is about 449C. The heat of fusion is about 167 cal/g and hence exceeds that of the eutec-tic mixture of LiF, KF and NaF (heat of fusion about
- 2 -plrl\T 7011 21~ 1974 ~ 046261 163 cal/g) by ~out 2.5 ~. Cons,equently, with equal storage capacity in the form of heat of fusion the quantity of salt mixture according to the invention may be smaller than that of the kno~-n mixture. In addition, the mixture according to the in~ention contains less I,iF, ~-hich means additional saving in expensive Li~.
A 4uaternary salt mixture consisting of 44.9 mol.~O of LiF, 40.6 mol.~ of KF, 11.5 mol.~ of ~aF and
A 4uaternary salt mixture consisting of 44.9 mol.~O of LiF, 40.6 mol.~ of KF, 11.5 mol.~ of ~aF and
3 mol.~0 of CaF2, melting point 444GC, has already been proposed as a heat-storage material (French Patent Specific-ation 1,52,4,997). This mixture contains a greater quantity of lithiwnfluoride than the mixture according to the in-vention and has a heat of fusion of about 1~9 cal/g, ~-h,ch is smaller than that of the kno~m miYture of LiF, ~ and hra~ and that o thc m-Yture accord~ng to the in~e~tion~
' The novel salt mixture can be obtained in the follo~.ring manner. A salt mixture is prepared wllich contains ' 44 mol.~ + 2 mol. ~ of LiF, 12 mol.~o + 1 mol. ~ ~aF, 40 mol.~ + 2 mol. Gp ~F and Ll mol.~ nol.~, of MgF2.
The mixt;lrc is repeatedl~- melted an~ slowly cooled until meltin~ at 4500C results iIl a clear ~elt.
The melt is decanted from any residlle ~hich at this tempe~ure h~ls not ~lelted, a~d then is cooled. The COID-positi~n of the melt then corresponds to the eutectic Pa-~ ~ o 1 1 ~ 0~
mixture having substantially the following composition:
44 mol.~ of LiF, 40 mol. ~ of KF, 12 mol.% of NaF and 4 mol.%
of MgF2 The salt mixture may be used as a heat storage material and as a heat transfer material. The mixture is chemically stable, non-combustible and doe~ not attack nickel-chromium steels; in operation it does not produce vapour, which is of importance for use in closed containers.-
' The novel salt mixture can be obtained in the follo~.ring manner. A salt mixture is prepared wllich contains ' 44 mol.~ + 2 mol. ~ of LiF, 12 mol.~o + 1 mol. ~ ~aF, 40 mol.~ + 2 mol. Gp ~F and Ll mol.~ nol.~, of MgF2.
The mixt;lrc is repeatedl~- melted an~ slowly cooled until meltin~ at 4500C results iIl a clear ~elt.
The melt is decanted from any residlle ~hich at this tempe~ure h~ls not ~lelted, a~d then is cooled. The COID-positi~n of the melt then corresponds to the eutectic Pa-~ ~ o 1 1 ~ 0~
mixture having substantially the following composition:
44 mol.~ of LiF, 40 mol. ~ of KF, 12 mol.% of NaF and 4 mol.%
of MgF2 The salt mixture may be used as a heat storage material and as a heat transfer material. The mixture is chemically stable, non-combustible and doe~ not attack nickel-chromium steels; in operation it does not produce vapour, which is of importance for use in closed containers.-
Claims (2)
1. Salt mixture which contains LiF and has a eutectic melting point between 400°C and 500°C, characterized in that it contains about 44 mol.% of LiF, about 40 mol.% of KF, about 12 mol.% of NaF and about 4 mol.% of MgF2.
2. Method of producing a salt mixture containing LiF
as claimed in Claim 1, characterized in that a salt mixture consisting of 44 mol.% ? 2 mol.% of LiF, 12 mol.% ? 1 mol.% of NaF, 40 mol.% ? 2 mol.% of KF and 4 mol.% ? MgF2 is prepared and is repeatedly melted and cooled until a clear melt which melts at 450°C is obtained which is decanted from any residue which has not melted at this temperature.
as claimed in Claim 1, characterized in that a salt mixture consisting of 44 mol.% ? 2 mol.% of LiF, 12 mol.% ? 1 mol.% of NaF, 40 mol.% ? 2 mol.% of KF and 4 mol.% ? MgF2 is prepared and is repeatedly melted and cooled until a clear melt which melts at 450°C is obtained which is decanted from any residue which has not melted at this temperature.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2336911A DE2336911C3 (en) | 1973-07-20 | 1973-07-20 | Heat storage or heat transport means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1046261A true CA1046261A (en) | 1979-01-16 |
Family
ID=5887494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA204,991A Expired CA1046261A (en) | 1973-07-20 | 1974-07-18 | Quaternary eutectic salt mixture containing lif |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5436916B2 (en) |
| BE (1) | BE817829A (en) |
| CA (1) | CA1046261A (en) |
| DE (1) | DE2336911C3 (en) |
| FR (1) | FR2237947B1 (en) |
| GB (1) | GB1470405A (en) |
| IE (1) | IE40925B1 (en) |
| NL (1) | NL7409596A (en) |
| SE (1) | SE398888B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3247968A1 (en) * | 1982-12-24 | 1984-06-28 | Brown, Boveri & Cie Ag, 6800 Mannheim | Thermal insulation |
| JP2578724B2 (en) * | 1993-12-29 | 1997-02-05 | 敏信 山下 | Outer diameter measuring device such as ERW pipe |
| RU2703220C1 (en) * | 2018-11-15 | 2019-10-15 | Федеральное Государственное Бюджетное Учреждение Науки "Институт проблем геотермии" Дагестанского научного центра Российской Академии наук | Heat accumulating material |
-
1973
- 1973-07-20 DE DE2336911A patent/DE2336911C3/en not_active Expired
-
1974
- 1974-07-16 NL NL7409596A patent/NL7409596A/en unknown
- 1974-07-16 FR FR7424647A patent/FR2237947B1/fr not_active Expired
- 1974-07-17 IE IE1518/74A patent/IE40925B1/en unknown
- 1974-07-17 SE SE7409332A patent/SE398888B/en unknown
- 1974-07-17 GB GB3166674A patent/GB1470405A/en not_active Expired
- 1974-07-17 JP JP8126374A patent/JPS5436916B2/ja not_active Expired
- 1974-07-18 CA CA204,991A patent/CA1046261A/en not_active Expired
- 1974-07-18 BE BE146712A patent/BE817829A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE2336911A1 (en) | 1975-02-06 |
| SE398888B (en) | 1978-01-23 |
| FR2237947B1 (en) | 1978-01-20 |
| GB1470405A (en) | 1977-04-14 |
| AU7131574A (en) | 1976-01-22 |
| NL7409596A (en) | 1975-01-22 |
| BE817829A (en) | 1975-01-20 |
| JPS5033985A (en) | 1975-04-02 |
| SE7409332L (en) | 1975-01-21 |
| DE2336911C3 (en) | 1980-03-06 |
| DE2336911B2 (en) | 1979-07-05 |
| FR2237947A1 (en) | 1975-02-14 |
| IE40925L (en) | 1975-01-20 |
| IE40925B1 (en) | 1979-09-12 |
| JPS5436916B2 (en) | 1979-11-12 |
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