CA2633250A1 - Self-heating chemical system for sustained modulation of temperature - Google Patents
Self-heating chemical system for sustained modulation of temperature Download PDFInfo
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- CA2633250A1 CA2633250A1 CA002633250A CA2633250A CA2633250A1 CA 2633250 A1 CA2633250 A1 CA 2633250A1 CA 002633250 A CA002633250 A CA 002633250A CA 2633250 A CA2633250 A CA 2633250A CA 2633250 A1 CA2633250 A1 CA 2633250A1
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- water
- heating element
- heat
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- coating
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- 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
- C09K5/16—Materials undergoing chemical reactions when used
- C09K5/18—Non-reversible chemical reactions
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- 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
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- 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
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
A self-heating chemical system using one or more primary components for exothermic reactions (such as calcium oxide), one or more porous components that can serve as a heat sink and conductor of heat as well as under going chemical transformations that release heat (zeolite), a weak acid (citric acid) for sustained modulation of temperature and pH. Exothermic reactions, mixing of some chemicals, sorption of certain chemicals, phase changes in chemicals, and dissolution of some chemicals in solvents release heat during these operations. The rate of heat generation coupled with mass and energy transfer rates to or from system(s) allows modulation of the temperature of systems. The modulation can be further enhanced by controlled release and availability of some of the components. This method provides with a class of self-heating product applications and focuses on the modulation of temperature through sequestering of reactions with different rates, heat release through dissolution, heat release through mixing, heat release through sorption, heat release through phase change as well as controlling mass and heat transfer rates.
Description
SELF-HEATING CHEMICAL SYSTEM FOR SUSTAINED
MODULATION OF TEMPERATURE
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims priority to currently pending U.S. Provisional Patent Application 60/597,605, entitled, "Self Heating Chemical Systems for Sustained Modulation of Temperature", filed December 13, 2005, the contents of which are herein incorporated by reference.
FIELD OF INVENTION
This invention relates to a self-heating system where the heat is provided by chemical reactions, mixing, sorption, phase change, and dissolution.
BACKGROUND OF THE INVENTION
Many self-heating products are emerging in the marketplace. The applications include products for food, beverages, and hand warmers. There are many areas such as disposable wipes where an unmet need exists is in the application of the technology. These applications, as well as others, require self-heating through the reaction of chemicals. The initiation and control of these reactions, retention and distribution of heat, and handling of materials are key issues. These issues are only partially handled for various products in the market. One key area not addressed in the market is a sustained modulation of heat.
SUMMARY OF INVENTION
A self-heating chemical system using one or more primary components for exothermic reactions (such as calcium oxide), one or more porous components that can serve as a heat sink and conductor of heat as well as under going chemical transformations that release heat (zeolite), a weak acid (citric acid) for sustained modulation of temperature and pH. Exothermic reactions, mixing of some chemicals, sorption of certain chemicals, phase changes in chemicals, and dissolution of some chemicals in solvents release heat during these operations. The rate of heat generation coupled with mass and energy transfer rates to or from system(s) allows modulation of the temperature of systems. The modulation can be further enhanced by controlled release and availability of some of the components. This method provides with a class of self-heating product applications and focuses on the modulation of temperature through sequestering of reactions with different rates, heat release through dissolution, heat release through mixing, heat release through sorption, heat release through phase change as well as aontrolling mass and heat transfer rates.
BRIEF DESCRIPTION OF THE DRAWINGS
For a fuller understanding of the invention, reference should be made to the following detailed description, taken in connection with the accompanying drawings, in which:
FIG. I is an illustration depicting a procedure for a chemical mixture for a self-heating chemical system for sustained heat modulation. The mix includes 17 g. of CaO (uncalcined), 8.5 g. HZeo, 1 g. citric acid, 4 g. PE and 36 ml. water.
FIG. 2 is a graph illustrating the temperature profile of the activated system depicted in FIG. 1. Ti through T4 refer to the temperature at various distances from the chemical pouch containing the reactants with distance increasing from Ti to T4.
FIG. 3 is an illustration depicting a procedure for a calcined CaO chemical mixture of a self-heating chemical system for sustained heat modulation. The mix included 17 g. of CaO (calcined), 8.5 g. HZeo, I g. citric acid, 4 g. .PE and 36 ml.
water.
FIG. 4 is a graph illustrating the temperature profile of the activated system depicted in FIG. 3. T1 through T4 refer to the temperature at various distances from the chemical pouch containing the reactants.
FIG. 5 is a graph depicting the moisture absorbed by the CaO as a function of time.
FIG. 6 is a graph illustrating the center temperature profile using the chemical mix composed of a primary heater (CaO), a porous component that also generates heat (Zeolite), and a weak acid (citric acid).
FIG. 7 is a graph illustrating the use of a slight vacuum to mix the chemicals with the water.
MODULATION OF TEMPERATURE
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims priority to currently pending U.S. Provisional Patent Application 60/597,605, entitled, "Self Heating Chemical Systems for Sustained Modulation of Temperature", filed December 13, 2005, the contents of which are herein incorporated by reference.
FIELD OF INVENTION
This invention relates to a self-heating system where the heat is provided by chemical reactions, mixing, sorption, phase change, and dissolution.
BACKGROUND OF THE INVENTION
Many self-heating products are emerging in the marketplace. The applications include products for food, beverages, and hand warmers. There are many areas such as disposable wipes where an unmet need exists is in the application of the technology. These applications, as well as others, require self-heating through the reaction of chemicals. The initiation and control of these reactions, retention and distribution of heat, and handling of materials are key issues. These issues are only partially handled for various products in the market. One key area not addressed in the market is a sustained modulation of heat.
SUMMARY OF INVENTION
A self-heating chemical system using one or more primary components for exothermic reactions (such as calcium oxide), one or more porous components that can serve as a heat sink and conductor of heat as well as under going chemical transformations that release heat (zeolite), a weak acid (citric acid) for sustained modulation of temperature and pH. Exothermic reactions, mixing of some chemicals, sorption of certain chemicals, phase changes in chemicals, and dissolution of some chemicals in solvents release heat during these operations. The rate of heat generation coupled with mass and energy transfer rates to or from system(s) allows modulation of the temperature of systems. The modulation can be further enhanced by controlled release and availability of some of the components. This method provides with a class of self-heating product applications and focuses on the modulation of temperature through sequestering of reactions with different rates, heat release through dissolution, heat release through mixing, heat release through sorption, heat release through phase change as well as aontrolling mass and heat transfer rates.
BRIEF DESCRIPTION OF THE DRAWINGS
For a fuller understanding of the invention, reference should be made to the following detailed description, taken in connection with the accompanying drawings, in which:
FIG. I is an illustration depicting a procedure for a chemical mixture for a self-heating chemical system for sustained heat modulation. The mix includes 17 g. of CaO (uncalcined), 8.5 g. HZeo, 1 g. citric acid, 4 g. PE and 36 ml. water.
FIG. 2 is a graph illustrating the temperature profile of the activated system depicted in FIG. 1. Ti through T4 refer to the temperature at various distances from the chemical pouch containing the reactants with distance increasing from Ti to T4.
FIG. 3 is an illustration depicting a procedure for a calcined CaO chemical mixture of a self-heating chemical system for sustained heat modulation. The mix included 17 g. of CaO (calcined), 8.5 g. HZeo, I g. citric acid, 4 g. .PE and 36 ml.
water.
FIG. 4 is a graph illustrating the temperature profile of the activated system depicted in FIG. 3. T1 through T4 refer to the temperature at various distances from the chemical pouch containing the reactants.
FIG. 5 is a graph depicting the moisture absorbed by the CaO as a function of time.
FIG. 6 is a graph illustrating the center temperature profile using the chemical mix composed of a primary heater (CaO), a porous component that also generates heat (Zeolite), and a weak acid (citric acid).
FIG. 7 is a graph illustrating the use of a slight vacuum to mix the chemicals with the water.
FIG. 8 is graph illustrating temperature profiles for a system using 5 towels and having a composition including 17.5 g. of CaO, 4.5 g. Chabazite, 3 g.
citric acid, and 35 ml. water. The graph illustrates the temperature at various points within the pouch system.
FIG. 9 is a pair of illustration. (A) is a graph depicting a desirable time-temperature band, and modulation thereof, for the heating system. (B) is an illustration depicting a coated chemical component/substrate for the system.
FIG. 10 is an illustration depicting a five towel application of the chemical pouch system utilizing a self-heating chemical system for sustained heat modulation.
FIG. 11 is an illustration depicting the chemical pouch system of the five towel application depicted in FIG. 10.
FIG. 12 is an illustration depicting a generalized scheme for a chemical pouch.
FIG. 13 is a series of illustrations depicting the activation of the generalized scheme of the chemical pouch depicted in FIG. 12. (A) depicts the pouch in an unactivated state with water filling the inner pouch exerting pressure on the pouch walls as indicated by the "p". (B) depicts the activation of the chemical pouch by applying pressure/force, denoted "F" externally to the pouch resulting in rupture of the inner pouch and release of water contained therein. (C) depicts the activated chemical pouch releasing heat denoted "Q".
FIG. 14 is a series of illustrations depicting a chemical pouch, based upon the generalized scheme of FIG. 12, surrounded by a towel. (A) depicts the pouch in the unactivated state where the pouch is completely surrounded by a towel. (B) depicts the pouch and towel system upon activation with the release of heat (Q).
FIG. 15 is a series of illustrations depicting a self-heating chemical system with the system seal in a in a pouch. (A) depicts the system in the unactivated state.
(B) depicts the activated system in the pouch.
citric acid, and 35 ml. water. The graph illustrates the temperature at various points within the pouch system.
FIG. 9 is a pair of illustration. (A) is a graph depicting a desirable time-temperature band, and modulation thereof, for the heating system. (B) is an illustration depicting a coated chemical component/substrate for the system.
FIG. 10 is an illustration depicting a five towel application of the chemical pouch system utilizing a self-heating chemical system for sustained heat modulation.
FIG. 11 is an illustration depicting the chemical pouch system of the five towel application depicted in FIG. 10.
FIG. 12 is an illustration depicting a generalized scheme for a chemical pouch.
FIG. 13 is a series of illustrations depicting the activation of the generalized scheme of the chemical pouch depicted in FIG. 12. (A) depicts the pouch in an unactivated state with water filling the inner pouch exerting pressure on the pouch walls as indicated by the "p". (B) depicts the activation of the chemical pouch by applying pressure/force, denoted "F" externally to the pouch resulting in rupture of the inner pouch and release of water contained therein. (C) depicts the activated chemical pouch releasing heat denoted "Q".
FIG. 14 is a series of illustrations depicting a chemical pouch, based upon the generalized scheme of FIG. 12, surrounded by a towel. (A) depicts the pouch in the unactivated state where the pouch is completely surrounded by a towel. (B) depicts the pouch and towel system upon activation with the release of heat (Q).
FIG. 15 is a series of illustrations depicting a self-heating chemical system with the system seal in a in a pouch. (A) depicts the system in the unactivated state.
(B) depicts the activated system in the pouch.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The disclosed invention is a self-heating chemical system for sustained modulation of temperature. A self-heating chemical system using one or more primary components for exothermic reactions (such as calcium oxide), one or more porous components that can serve as a heat sink and conductor of heat as well as under going chemical transformations that release heat (zeolite), a weak acid (citric acid) for sustained modulation of temperature and pH. Exothermic reactions, mixing of some chemicals, sorption of certain chemicals, phase changes in chemicals, and dissolution of some chemicals in solvents release heat during these operations. The rate of heat generation coupled with mass and energy transfer rates to or from system(s) allows modulation of the temperature of systems_ This invention relates to a mixture that allows sequencing. The key reactions/transfonnation are as follows:
CaO + H20 4 Ca(OH)2 calcium oxide + water 4 calcium hydroxide Zeolite + Water 4 Hydrated zeolite + Water CaO ' MgO + H20 -> Ca(OH)2 + MgO
MgO + H20 4 Mg(OH)2 2 Ca(OH)Z+ 3C6H$07 (aq.) -> CaZ(C6H5O7) .l = 4 HZO + 2 H20 calcium hydroxide + citric acid 4 calcium citrate Referring to FIG. 6 there is a graph illustrating the heat generated as a function of time of a chemical mix composed of a primary heater (CaO), a porous component that also generates heat (Zeolite), and a weak acid (citric acid). The amount of chemical used is this illustration is about 42gr. The mix is 77% CaO , 14%
Zeolite and 9% Citric Acid by weight for full recipe; and 84% CaO and 16% Zeolite for the recipe without citric acid. The total amount of chemicals and water used is the same in all three cases. As shown, the system can heat fast and maintain a uniform and high temperature.
The disclosed invention is a self-heating chemical system for sustained modulation of temperature. A self-heating chemical system using one or more primary components for exothermic reactions (such as calcium oxide), one or more porous components that can serve as a heat sink and conductor of heat as well as under going chemical transformations that release heat (zeolite), a weak acid (citric acid) for sustained modulation of temperature and pH. Exothermic reactions, mixing of some chemicals, sorption of certain chemicals, phase changes in chemicals, and dissolution of some chemicals in solvents release heat during these operations. The rate of heat generation coupled with mass and energy transfer rates to or from system(s) allows modulation of the temperature of systems_ This invention relates to a mixture that allows sequencing. The key reactions/transfonnation are as follows:
CaO + H20 4 Ca(OH)2 calcium oxide + water 4 calcium hydroxide Zeolite + Water 4 Hydrated zeolite + Water CaO ' MgO + H20 -> Ca(OH)2 + MgO
MgO + H20 4 Mg(OH)2 2 Ca(OH)Z+ 3C6H$07 (aq.) -> CaZ(C6H5O7) .l = 4 HZO + 2 H20 calcium hydroxide + citric acid 4 calcium citrate Referring to FIG. 6 there is a graph illustrating the heat generated as a function of time of a chemical mix composed of a primary heater (CaO), a porous component that also generates heat (Zeolite), and a weak acid (citric acid). The amount of chemical used is this illustration is about 42gr. The mix is 77% CaO , 14%
Zeolite and 9% Citric Acid by weight for full recipe; and 84% CaO and 16% Zeolite for the recipe without citric acid. The total amount of chemicals and water used is the same in all three cases. As shown, the system can heat fast and maintain a uniform and high temperature.
Referring to FIG. 7 there is shown a graph illustrating the temperature profile comparing a vaccum to non-vacuum. The results illustrate the advantages of using slight vacuum. As depicted, the vacuum provides an avenue for rapid and thorough mixing of water (solvent) with the chemicals. The resulting reaction avoids hot spots due to improper mixing that happens during the initial period. Furthermore, vacuumed containment results in more uniform and higher temperatures, at latter periods, upon mixing. The porous component allows intra-particle void space. The inter-particle void space is not pertinent and is reduced during vacuuming.
Referring to FIG. 8 there is shown the time-temperature profile of a 5 towel system employing 7.5 g. of CaO, 4.5 g. Chabazite, 3 g. citric acid, and 35 ml.
water.
The figure illustrates temperature profiles of five disposable wash clothes heated using the aforementioned chemical system composed of chemicals containment (chemical pouch) and containment comprised of water (water pouch). All but water is in one pouch while water is in another pouch. When the chemicals are mixed the reaction is initiated to heat the adjacent wash clothes. The time-temperature profiles of five wash clothes are given in FIG. 8 along with the chemical recipe.
Figure 9(A) illustrates a desirable time-temperature band the heating system should be modulated within as well as one of the ways it can be achieved. The coated material, as shown in FIG. 9(B), can be any of the chemical (zeolite, calcium oxide and citric acid) components. All or fraction of the compounds can be encapsulated.
The particle size of the chemicals, chemicals coated, coating thickness, coating material, porosity of the porous compounds, the amount of chemicals used, the composition of the chemical mix, and the amount of water used all enable modulating and sustained performance within the desirable time-temperature band.
Fig. 10 illustrates a self-heating system for sustained modulation providing a contained packet system (16) with five towels (60). A vacuum is used to create a gradient for the water to move into the chemical pouch (10). Referring to FIG.
11, the vacuum allows the chemical mix (20) to wet faster and therefore heat faster and more evenly when the water pouch (42) containing the water (40) is broken. As the water pouch (42) is broken, the water is contained within the sealant film (22) of the chemical pouch (10). The porous material allows more reaction area and enables pulling vacuum better. The pull vacuum helps to empty void space. Since the pouch material is flexible and takes the shape of material (i.e. the chemical particles) you are vacuuming, the available space for the water to go through is very limited if you do not have porous particles. In the absence of porous particles, the volume you would have is limited to void space between neighboring particles. Instead, in the present instance, the porous matrix in the particles allows space for water without the chemical pouch expanding significantly.
Referring to FIG. 12, there is shown a generalized schema of the chemical pouch (10) of the self-heating chemical system for sustained modulation of heat. The pouch is a dual layer system with water (40) contained in the inner water pouch (42) and the chemical mix (20) contained in the outer pouch, the limit of which is defined by the outer sealant film (22). By sequestering the water in the inner pouch, the system can be stored and transported in an unactivated/unreacted state. Heat generation begins upon rupture of the water pouch (40).
Referrring to FIG. 13 there is shown the procedure for activation of an exemplary system. In the unactivated state the water (40) is maintained in the water pouch (42), filling the pouch and applying a pressure (p) on the inner walls of the water pouch (42). Referring to FIG. 13 (B), a user exerts a force (F) on the external walls of the sealant film (22) chemical pouch (10), causing the water pouch (22) to rupture. The rupture of the water pouch (42) allows the water (40) contained therein the escape the water pouch (42) and mix with the chemical mix (20) contained within the sealant film (22). Referring to FIG. 13(C), it is illustrated that the mixture of the water (40) with the chemical mix (20) within the chemical pouch system (10) produces an exothermic reaction that liberates heat (Q).
Referring to FIG. 14(A) there is shown a generalized schema of a towel system (12) employing the self-heating chemical system for sustained modulation of heat. The towel system utilizes one or more towels (60) chemical surrounding a chemical pouch system (10). FIG. 14(B) illustrates the towel system upon rupture of the water pouch (42), thus allowing the mixture of the water (40) with the chemical mixture (20) resulting in the liberation of heat (Q) from the system.
Referring to FIG. 15 there is shown a generalized schema of a towel-pouch system (16) wherein a towel system (12) employing the self-heating chemical system (10) for sustained modulation of heat is contained. The towel-pouch system (16) includes an outer film (82) to store and contain the towel system (12) employing the chemical pouch (10) of the self-heating chemical system for sustained modulation of heat. Where applicable, an insulator can be localized to the area (80) immediately adjacent to the outer film (82) to insulate the chemical system and the heat (Q) produced by the reaction of the system. The outer film (82) further includes a seal (84) to facilitate entry into the towel-pouch system (16) and removal of the towels system (12) contained therein_ The present invention facilitates the time-temperature modulation of heating.
Furthermore, components, principally the water which initiates the reaction is sequestered, while upon the rupture of the water pouch the chemical component system enables the effective missing of the water with the chemicals. In certain aspect, the two pouch system utilizes heating components such as CaO/Zeolite/Citric acid in an outer pouch that is vacuumed. The inner pouch contains the water.
When you break the inner pouch by squeezing pouches, the inner pouch breaks and water rapidly permeates and diffuses into the chemicals.
Citric acid is used in the reaction to neutralize the reaction mix. The citric acid goes through an exothermic reaction producing calcium citrate to further generate heat. It also has an endothermic dissolution step in water that cools the system in a regulated fashion to keep the temperatures within acceptable limits. Also, Calcium citrate is environmentally friendly compound. MgO as shown in the previous formulas above is quick lime raw material mix. The mixture enables the following:
4 The CaO reactions are fast and generate more heat while Zeolite generates less heat and more slowly. A mix avoids hot spots and enables sustained heating.
-> The zeolite is highly porous and enable pulling vacuum. Thus, we can mix both zeolite and CaO rapidly and uniformly.
Referring to FIG. 8 there is shown the time-temperature profile of a 5 towel system employing 7.5 g. of CaO, 4.5 g. Chabazite, 3 g. citric acid, and 35 ml.
water.
The figure illustrates temperature profiles of five disposable wash clothes heated using the aforementioned chemical system composed of chemicals containment (chemical pouch) and containment comprised of water (water pouch). All but water is in one pouch while water is in another pouch. When the chemicals are mixed the reaction is initiated to heat the adjacent wash clothes. The time-temperature profiles of five wash clothes are given in FIG. 8 along with the chemical recipe.
Figure 9(A) illustrates a desirable time-temperature band the heating system should be modulated within as well as one of the ways it can be achieved. The coated material, as shown in FIG. 9(B), can be any of the chemical (zeolite, calcium oxide and citric acid) components. All or fraction of the compounds can be encapsulated.
The particle size of the chemicals, chemicals coated, coating thickness, coating material, porosity of the porous compounds, the amount of chemicals used, the composition of the chemical mix, and the amount of water used all enable modulating and sustained performance within the desirable time-temperature band.
Fig. 10 illustrates a self-heating system for sustained modulation providing a contained packet system (16) with five towels (60). A vacuum is used to create a gradient for the water to move into the chemical pouch (10). Referring to FIG.
11, the vacuum allows the chemical mix (20) to wet faster and therefore heat faster and more evenly when the water pouch (42) containing the water (40) is broken. As the water pouch (42) is broken, the water is contained within the sealant film (22) of the chemical pouch (10). The porous material allows more reaction area and enables pulling vacuum better. The pull vacuum helps to empty void space. Since the pouch material is flexible and takes the shape of material (i.e. the chemical particles) you are vacuuming, the available space for the water to go through is very limited if you do not have porous particles. In the absence of porous particles, the volume you would have is limited to void space between neighboring particles. Instead, in the present instance, the porous matrix in the particles allows space for water without the chemical pouch expanding significantly.
Referring to FIG. 12, there is shown a generalized schema of the chemical pouch (10) of the self-heating chemical system for sustained modulation of heat. The pouch is a dual layer system with water (40) contained in the inner water pouch (42) and the chemical mix (20) contained in the outer pouch, the limit of which is defined by the outer sealant film (22). By sequestering the water in the inner pouch, the system can be stored and transported in an unactivated/unreacted state. Heat generation begins upon rupture of the water pouch (40).
Referrring to FIG. 13 there is shown the procedure for activation of an exemplary system. In the unactivated state the water (40) is maintained in the water pouch (42), filling the pouch and applying a pressure (p) on the inner walls of the water pouch (42). Referring to FIG. 13 (B), a user exerts a force (F) on the external walls of the sealant film (22) chemical pouch (10), causing the water pouch (22) to rupture. The rupture of the water pouch (42) allows the water (40) contained therein the escape the water pouch (42) and mix with the chemical mix (20) contained within the sealant film (22). Referring to FIG. 13(C), it is illustrated that the mixture of the water (40) with the chemical mix (20) within the chemical pouch system (10) produces an exothermic reaction that liberates heat (Q).
Referring to FIG. 14(A) there is shown a generalized schema of a towel system (12) employing the self-heating chemical system for sustained modulation of heat. The towel system utilizes one or more towels (60) chemical surrounding a chemical pouch system (10). FIG. 14(B) illustrates the towel system upon rupture of the water pouch (42), thus allowing the mixture of the water (40) with the chemical mixture (20) resulting in the liberation of heat (Q) from the system.
Referring to FIG. 15 there is shown a generalized schema of a towel-pouch system (16) wherein a towel system (12) employing the self-heating chemical system (10) for sustained modulation of heat is contained. The towel-pouch system (16) includes an outer film (82) to store and contain the towel system (12) employing the chemical pouch (10) of the self-heating chemical system for sustained modulation of heat. Where applicable, an insulator can be localized to the area (80) immediately adjacent to the outer film (82) to insulate the chemical system and the heat (Q) produced by the reaction of the system. The outer film (82) further includes a seal (84) to facilitate entry into the towel-pouch system (16) and removal of the towels system (12) contained therein_ The present invention facilitates the time-temperature modulation of heating.
Furthermore, components, principally the water which initiates the reaction is sequestered, while upon the rupture of the water pouch the chemical component system enables the effective missing of the water with the chemicals. In certain aspect, the two pouch system utilizes heating components such as CaO/Zeolite/Citric acid in an outer pouch that is vacuumed. The inner pouch contains the water.
When you break the inner pouch by squeezing pouches, the inner pouch breaks and water rapidly permeates and diffuses into the chemicals.
Citric acid is used in the reaction to neutralize the reaction mix. The citric acid goes through an exothermic reaction producing calcium citrate to further generate heat. It also has an endothermic dissolution step in water that cools the system in a regulated fashion to keep the temperatures within acceptable limits. Also, Calcium citrate is environmentally friendly compound. MgO as shown in the previous formulas above is quick lime raw material mix. The mixture enables the following:
4 The CaO reactions are fast and generate more heat while Zeolite generates less heat and more slowly. A mix avoids hot spots and enables sustained heating.
-> The zeolite is highly porous and enable pulling vacuum. Thus, we can mix both zeolite and CaO rapidly and uniformly.
4 The zeolite stores heat and conducts uniformly.
--> Zeolites are environmentally friendly.
The system can be further tailored by encapsulating the chemical mixture in a coating. The coating chemicals can then dissolve and disintegrate with temperature, pH change and mixing with water. It is further envisioned that the thickness of the coating can be tailored to achieve desired rates of reaction, such as delaying the initiation of reaction by the contact with the water. It is further envisioned that particles of various depths of coating may be used in an individual application to further tailor the modulation of response by having particles with thinner coatings initiate reaction more quickly, while thicker coatings producing a delayed response.
The coating chemicals can be water soluble polymers or sugars or any other chemical that disintegrates with heating The system provides economy, sustainment and modulation of heat release, strorage of energy. The towels used in such a system can be wet towels or dry towels, The towel system is meant to be exemplary of the types of uses that can be provided in a chemical system for sustained modulation of heat, but should not be interpreted as limiting to that particular application.
The disclosures of all publications cited above are expressly incorporated herein by reference, each in its entirety, to the same extent as if each were incorporated by reference individually.
It will be seen that the advantages set forth above, and those made apparent from the foregoing description, are efficiently attained and since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matters contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall there between. Now that the invention has been described,
--> Zeolites are environmentally friendly.
The system can be further tailored by encapsulating the chemical mixture in a coating. The coating chemicals can then dissolve and disintegrate with temperature, pH change and mixing with water. It is further envisioned that the thickness of the coating can be tailored to achieve desired rates of reaction, such as delaying the initiation of reaction by the contact with the water. It is further envisioned that particles of various depths of coating may be used in an individual application to further tailor the modulation of response by having particles with thinner coatings initiate reaction more quickly, while thicker coatings producing a delayed response.
The coating chemicals can be water soluble polymers or sugars or any other chemical that disintegrates with heating The system provides economy, sustainment and modulation of heat release, strorage of energy. The towels used in such a system can be wet towels or dry towels, The towel system is meant to be exemplary of the types of uses that can be provided in a chemical system for sustained modulation of heat, but should not be interpreted as limiting to that particular application.
The disclosures of all publications cited above are expressly incorporated herein by reference, each in its entirety, to the same extent as if each were incorporated by reference individually.
It will be seen that the advantages set forth above, and those made apparent from the foregoing description, are efficiently attained and since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matters contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall there between. Now that the invention has been described,
Claims (26)
1. A heat-producing composition comprising calcium oxide, zeolite and one or more weak acids.
2. The composition according to claim 1 wherein the one or more weak acids is citric acid.
3. The composition according to claim 2 wherein the weight ratio of the calcium oxide:zeolite:citric acid is about 8:1:1.
4. The composition according to claim 1 wherein the composition is encapsulated in a coating.
5. The composition according to claim 4 wherein the coating is water-soluble.
6. The composition according to claim 4 wherein the coating is selected from the group consisting of water-soluble polymers and sugars.
7. A heating element to provide extended heat transmission comprising:
a containment member comprising water; and a reaction mixture comprising calcium oxide and zeolite, wherein release of the water in the containment member allows contact with the reaction mixture thereby producing an exothermic reaction.
a containment member comprising water; and a reaction mixture comprising calcium oxide and zeolite, wherein release of the water in the containment member allows contact with the reaction mixture thereby producing an exothermic reaction.
8. The heating element according to claim 7 wherein the reaction mixture further comprises one or more one or more weak acids to neutralize the calcium hydroxide produced by the reaction of the water with the calcium oxide and further regulate temperature.
9. The heating element according to claim 8 wherein the one or more weak acids is citric acid.
10. The heating element according to claim 9 wherein the weight ratio of the reaction mixture of calcium oxide:zeolite:citric acid is about 8:1:1.
11. The heating element according to claim 7 wherein the reaction mixture is encapsulated in a coating.
12. The heating element according to claim 11 wherein the coating is water-soluble.
13. The heating element according to claim 11 wherein the coating is selected from the group consisting of water-soluble polymers and sugars.
14. A heating element to provide extended heat transmission comprising:
an inner containment member comprising water; and an outer containment member comprising a reaction mixture comprising calcium oxide, zeolite and a weak acid, wherein release of the water in the inner containment member allows contact with the reaction mixture thereby producing an exothermic reaction.
an inner containment member comprising water; and an outer containment member comprising a reaction mixture comprising calcium oxide, zeolite and a weak acid, wherein release of the water in the inner containment member allows contact with the reaction mixture thereby producing an exothermic reaction.
15. The heating element according to claim 14 wherein the one or more weak acids is citric acid.
16. The heating element according to claim 14 wherein the contents of the outer containment member are under vacuum.
17. The heating element according to claim 14 wherein the inner containment member is at a pressure higher that the outer containment member.
18. The heating element according to claim 16 wherein the outer containment member is vacuum-sealed to the inner containment member.
19. The heating element according to claim 14 wherein the reaction mixture is encapsulated in a coating.
20. The heating element according to claim 19 wherein the coating is water-soluble.
21. The heating element according to claim 19 wherein the coating is selected from the group consisting of water-soluble polymers and sugars.
22. The heating element according to claim 15 wherein the reaction mixture is encapsulated in a coating.
23. A self-heating chemical system for the production of warm towels comprising a pouch system containing one or more towels and a heating element, the heating element comprising an inner containment member comprising water and an outer containment member comprising a reaction mixture comprising calcium oxide, zeolite and a weak acid, wherein release of the water in the inner containment member allows contact with the reaction mixture thereby producing an exothermic reaction.
24. The self-heating chemical system according to claim 23 wherein the one or more weak acids is citric acid.
25. The self-heating chemical system according to claim 23 wherein the contents of the outer containment member are under vacuum.
26. The self-heating chemical system according to claim 23 wherein the reaction mixture is encapsulated in a coating.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US59760505P | 2005-12-13 | 2005-12-13 | |
| US60/597,605 | 2005-12-13 | ||
| PCT/US2006/047621 WO2007087039A2 (en) | 2005-12-13 | 2006-12-13 | Self-heating chemical system for sustained modulation of temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2633250A1 true CA2633250A1 (en) | 2007-08-02 |
Family
ID=38309701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002633250A Abandoned CA2633250A1 (en) | 2005-12-13 | 2006-12-13 | Self-heating chemical system for sustained modulation of temperature |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20070289720A1 (en) |
| EP (1) | EP1969295A4 (en) |
| CA (1) | CA2633250A1 (en) |
| WO (1) | WO2007087039A2 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8138111B2 (en) | 2007-06-06 | 2012-03-20 | Honeywell International Inc. | Time-delayed activation of zeolite heating |
| US7951123B2 (en) * | 2008-03-05 | 2011-05-31 | James A. Donovan | Spa wax heating device |
| US7937909B2 (en) * | 2008-06-30 | 2011-05-10 | James A. Donovan | Method for creating a package pressure differential |
| WO2010080898A2 (en) | 2009-01-07 | 2010-07-15 | University Of South Florida | Sustained modulation of temperature of self heating chemical system |
| EP2582767B1 (en) * | 2010-06-15 | 2020-07-22 | University Of South Florida | Exothermic reaction compositions |
| JP5522465B2 (en) * | 2010-07-28 | 2014-06-18 | 日本電気株式会社 | Envelope amplifier |
| JP5808490B2 (en) | 2011-09-06 | 2015-11-10 | ブリティッシュ アメリカン タバコ （インヴェストメンツ） リミテッドＢｒｉｔｉｓｈ Ａｍｅｒｉｃａｎｔｏｂａｃｃｏ （Ｉｎｖｅｓｔｍｅｎｔｓ） Ｌｉｍｉｔｅｄ | Smoking material heating |
| GB201217067D0 (en) | 2012-09-25 | 2012-11-07 | British American Tobacco Co | Heating smokable material |
| GB201311620D0 (en) | 2013-06-28 | 2013-08-14 | British American Tobacco Co | Devices Comprising a Heat Source Material and Activation Chambers for the Same |
| GB201500582D0 (en) | 2015-01-14 | 2015-02-25 | British American Tobacco Co | Apparatus for heating or cooling a material contained therein |
| US11924930B2 (en) | 2015-08-31 | 2024-03-05 | Nicoventures Trading Limited | Article for use with apparatus for heating smokable material |
| US20170055584A1 (en) | 2015-08-31 | 2017-03-02 | British American Tobacco (Investments) Limited | Article for use with apparatus for heating smokable material |
| US20170055575A1 (en) | 2015-08-31 | 2017-03-02 | British American Tobacco (Investments) Limited | Material for use with apparatus for heating smokable material |
| US20170119046A1 (en) | 2015-10-30 | 2017-05-04 | British American Tobacco (Investments) Limited | Apparatus for Heating Smokable Material |
| US20170119047A1 (en) | 2015-10-30 | 2017-05-04 | British American Tobacco (Investments) Limited | Article for Use with Apparatus for Heating Smokable Material |
| CN105854133B (en) * | 2016-03-25 | 2018-11-09 | 南昌大学 | Woven hose heating patch |
| ES2906702T3 (en) * | 2017-07-20 | 2022-04-20 | Tempra Tech Inc | Self-heating food bag with distributed reagents and manufacturing method |
| CN114916851A (en) * | 2022-06-17 | 2022-08-19 | 王乾新 | Electric heating towel rack |
Family Cites Families (54)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3475239A (en) * | 1968-11-04 | 1969-10-28 | Ciba Geigy Corp | Exothermic composition containing a metal oxide and acid or acid salts |
| US3903011A (en) * | 1973-08-01 | 1975-09-02 | Readi Temp | Exo-thermic heat transfer |
| IT995140B (en) * | 1973-08-03 | 1975-11-10 | Grosso A | SELF-HEATING CONTAINER FOR PRE-COOKED FOOD |
| US3950158A (en) * | 1974-05-31 | 1976-04-13 | American Medical Products Company | Urea cold pack having an inner bag provided with a perforated seal |
| US4089703A (en) * | 1976-12-23 | 1978-05-16 | White Chemical Company, Inc. | Hot detergent process |
| JPS55114251A (en) * | 1979-02-27 | 1980-09-03 | Earth Chemical Co | Smoking method |
| US4559921A (en) * | 1982-11-05 | 1985-12-24 | Simon Benmussa | Self-heating receptacle |
| US4627972A (en) * | 1984-11-16 | 1986-12-09 | Union Carbide Corporation | Effervescent dentifrice |
| AU2382288A (en) * | 1987-09-17 | 1989-04-17 | Gentoku Kaneko | Heater |
| JPH01254580A (en) * | 1988-03-24 | 1989-10-11 | Dainippon Printing Co Ltd | Compound of heating agent and vessel for heating foodstuff |
| US5018505A (en) * | 1988-08-18 | 1991-05-28 | Nissin Shokuhin Kabushiki Kaisha | Self-heating container |
| US5035230A (en) * | 1990-02-23 | 1991-07-30 | Steidl Gary V | Disposable food heater |
| US5494598A (en) * | 1991-05-24 | 1996-02-27 | Thermionics Corporation | Heat exchange medium and articles for use thereof |
| CA2069687A1 (en) * | 1991-06-28 | 1992-12-29 | Chandra Kumar Banerjee | Tobacco smoking article with electrochemical heat source |
| US5168708A (en) * | 1991-09-23 | 1992-12-08 | Israel Siegel | Disposable and reusable valveless sorption self-cooling and self-heating containers |
| US5230216A (en) * | 1992-07-27 | 1993-07-27 | Israel Siegel | Magnetic sorption self cooling and self heating containers |
| US5281727A (en) * | 1992-11-27 | 1994-01-25 | Napro Biotherapeutics, Inc. | Method of using ion exchange media to increase taxane yields |
| US5370221A (en) * | 1993-01-29 | 1994-12-06 | Biomet, Inc. | Flexible package for bone cement components |
| US5355869A (en) * | 1994-02-15 | 1994-10-18 | The United States Of America As Represented By The Secretary Of The Army | Self-heating group meal assembly and method of using same |
| US5465707A (en) * | 1994-06-15 | 1995-11-14 | Fulcher; Fred | Self heating individual meal package |
| US5542418A (en) * | 1995-01-30 | 1996-08-06 | Hotcan International, Ltd. | Acid-base fuels for self heating food containers |
| US5483949A (en) * | 1994-09-22 | 1996-01-16 | James; Dean B. | Exothermic compositions and container for heating food |
| US5628304A (en) * | 1995-06-22 | 1997-05-13 | G & S Regal Trading Corporation | Self-heating container |
| DE69618786T2 (en) * | 1995-07-10 | 2002-11-07 | Unilever Nv | HEAT GENERATING TOOTHPASTE |
| US5738082A (en) * | 1995-07-19 | 1998-04-14 | Page; Glenn A. | Portable baby wipes warmer and carrier |
| US5935486A (en) * | 1996-08-02 | 1999-08-10 | Tda Research, Inc. | Portable heat source |
| US6116231A (en) * | 1998-02-11 | 2000-09-12 | Tempra Technology, Inc. | Liquid heat pack |
| US5984953A (en) * | 1998-05-21 | 1999-11-16 | Tempra Technology, Inc. | Self-regulating heat pack |
| KR100576211B1 (en) * | 1999-01-14 | 2006-05-03 | 아스세이야쿠가부시키가이샤 | Heat transpiration preparation and method of the heat transpiration of chemical by using the same |
| GB9904357D0 (en) * | 1999-02-26 | 1999-04-21 | Richardson Robert N | Improvements to beverage and other containers |
| US6341602B1 (en) * | 1999-03-09 | 2002-01-29 | Fred Fulcher | Package for flameless heating and heater for the package |
| US6289889B1 (en) * | 1999-07-12 | 2001-09-18 | Tda Research, Inc. | Self-heating flexible package |
| US6245729B1 (en) * | 1999-07-27 | 2001-06-12 | Ecolab, Inc. | Peracid forming system, peracid forming composition, and methods for making and using |
| US7235187B2 (en) * | 2000-07-13 | 2007-06-26 | The Procter & Gamble Company | Methods and apparatuses for delivering a volatile component via a controlled exothermic reaction |
| KR100804158B1 (en) * | 2000-08-10 | 2008-02-19 | 알제이 리그룹 인코퍼레이티드 | Low energy method of pyrolysis of hydrocarbon materials such as rubber |
| US20030185779A1 (en) * | 2000-09-08 | 2003-10-02 | The Procter & Gamble Company | Hair care kits and heating devices for warming hair care compositions |
| CA2346223C (en) * | 2001-05-25 | 2002-12-10 | Ivan Sestak | Self heating pre-moistened wipe(s) package |
| EP1401730A1 (en) * | 2001-06-29 | 2004-03-31 | The Procter & Gamble Company | Self-heating/self-cooling package |
| US6648133B1 (en) * | 2001-07-18 | 2003-11-18 | Biomet, Inc. | Device and method for hydrating and rehydrating orthopedic graft materials |
| US6640801B2 (en) * | 2001-08-29 | 2003-11-04 | Tempra Technology, Inc. | Heat pack with expansion capability |
| CA2363979A1 (en) * | 2001-11-26 | 2003-05-26 | Jerko Saric | Improved trigger mechanism for self-heating/cooling packages or containers universally applied to both rigid and non-rigid packages and containers |
| US7150321B2 (en) * | 2002-12-10 | 2006-12-19 | Halliburton Energy Services, Inc. | Zeolite-containing settable spotting fluids |
| GB0323754D0 (en) * | 2003-10-10 | 2003-11-12 | Reckitt Benckiser Uk Ltd | Article and method |
| US7448450B2 (en) * | 2003-12-04 | 2008-11-11 | Halliburton Energy Services, Inc. | Drilling and cementing with fluids containing zeolite |
| US7431825B2 (en) * | 2003-12-05 | 2008-10-07 | Intercat, Inc. | Gasoline sulfur reduction using hydrotalcite like compounds |
| US20060005827A1 (en) * | 2004-05-04 | 2006-01-12 | Candle Corporation Of America | Heater product, system and composition |
| FR2871681B1 (en) * | 2004-06-18 | 2006-09-15 | Patrick Caceres | COOLING COMPRESSOR WITH STERILE PRESENTATION |
| US7297664B2 (en) * | 2004-07-28 | 2007-11-20 | Halliburton Energy Services, Inc. | Cement-free zeolite and fly ash settable fluids and methods therefor |
| US20070102672A1 (en) * | 2004-12-06 | 2007-05-10 | Hamilton Judd D | Ceramic radiation shielding material and method of preparation |
| WO2006128118A2 (en) * | 2005-05-27 | 2006-11-30 | Tempra Technology, Inc. | Slow cooking heating formula |
| US7878187B2 (en) * | 2005-09-23 | 2011-02-01 | Wyeth Llc | Heat cells comprising exothermic compositions having absorbent gelling material |
| EP1986533B1 (en) * | 2006-02-24 | 2011-11-02 | Harvest Charmfoods Co. Ltd. | Pouch pack with controlled temperature |
| US20080097358A1 (en) * | 2006-10-20 | 2008-04-24 | Dovonan James A | Personal Hygiene wipe |
| US20080147152A1 (en) * | 2006-12-15 | 2008-06-19 | Kimberly-Clark Worldwide, Inc. | Self-activated warming device |
-
2006
- 2006-12-13 WO PCT/US2006/047621 patent/WO2007087039A2/en active Application Filing
- 2006-12-13 US US11/610,192 patent/US20070289720A1/en not_active Abandoned
- 2006-12-13 EP EP06847628A patent/EP1969295A4/en not_active Withdrawn
- 2006-12-13 CA CA002633250A patent/CA2633250A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007087039A2 (en) | 2007-08-02 |
| WO2007087039A3 (en) | 2007-12-27 |
| US20070289720A1 (en) | 2007-12-20 |
| EP1969295A2 (en) | 2008-09-17 |
| EP1969295A4 (en) | 2010-12-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |
Effective date: 20131213 |