Method of production of CO2 using lime to limestone chemical reaction

Abstract

Production of lime (calcium oxide: CaO) from limestone (CaCO.sub.3) is one of the oldest natural chemical processes and this process is reversible, per FIG. 4 (CaCO.sub.3.fwdarw.CaO+CO.sub.2 under 500 to 600 C. heat). Subsequently when lime is exposed to the moving air; carbon dioxide (CO.sub.2) in the air will react with the lime and lime will convert back to limestone. By repeating same limestone to lime chemical process, lime and carbon dioxide (CO.sub.2) will be created. After separating and storing the carbon dioxide (CO.sub.2), process will be repeated continuously, using the same lime.

Claims

1. A method for mass production of carbon dioxide comprising the use of a reverse, limestone to lime reaction, CaCO.sub.3.fwdarw.CaO+CO.sub.2 at 500 to 600 C. and reversed CaO+CO.sub.2.fwdarw.CaCO.sub.3, to remove carbon dioxide from the ambient air, wherein lime is mixed with a water at about 35 gallons of water per 1 cubic yard of lime, creating a lime slurry; pouring the lime slurry into specially designed conveyor pans; wherein chains comprised of stainless steel wires are placed downwards, about six inches on center, into the pan, prior to pouring the lime slurry; wherein the lime slurry reacts with carbon dioxide in the ambient air and starts to harden in about one hour; then by use of a magnetic holders, lime panels moved from the pans at the conveyor to the moving cable hangers; wherein after about 24 hours, the lime panels convert back to limestone, gains about 4000 psi compressive strength; crushing the newly created limestone panels, separating said limestone from the chains and after grinding said limestone panels, filling a containers comprising a 12 inch diameter, 25 feet high stainless steel pipe wrapped with electrical heating coils; wherein container further comprises a means for drying powdered limestone at a temperature in the range of 200 to 300 C.; capturing water vapor and then continuing the heating process at a temperature range of 500 to 600 C., allowing the limestone to turn back into lime, thereby creating a carbon dioxide during the process; separating the carbon dioxide from the lime; storing the carbon dioxide in an appropriate tank, and then recycling the lime to the mixing area to be mixed with water and repeat the process.

2. A conveyor pan for the mass production of carbon dioxide according to claim 1, comprising an 8 feet by 8 feet by 1 inch thick stainless steel sheet metal, suitable for standard conveyer use; chains, comprised of stainless steel wires placed downwards, about six inches on center in to the pan, prior pouring the lime slurry; further comprising magnetic holders to move lime panels from pens at the conveyor to a moving cable hanger.

Description

2. DESCRIPTION

(1) As per common knowledge chemical formula (see FIG. 4), CaCO.sub.3.fwdarw.CaO+CO.sub.2 under 500 to 600 C. heat, limestone start releasing carbon dioxide and converting to a lime. Additionally this process is reversible or when lime is in contact with the air, carbon dioxide in the air, start reacting with the lime and lime start converting back to limestone. Subsequently it is posable to remove carbon dioxide from the ambient air, by using this same theory; allowing lime to react with the carbon dioxide in the air, absorbing it and after lime converting back to limestone, newly created limestone under the heat, converted back to lime and carbon dioxide; capturing carbon dioxide and storing. To speed up this process/reaction between carbon dioxide (CO.sub.2) within the ambient air and with the lime, first lime is mixed with a water, 32 to 39 gallons of water per 1 cubic yard of lime, creating a lime slurry. Newly created lime slurry poured into a specially designed conveyor pans, 8 feet by 8 feet and 1 inch thick, comprising with 18 gage stainless steel sheet metal, suitable for standard conveyer use (FIG. 2, item-1). Chains, comprising of ten gage stainless steel, will be placed (downwards direction about six inches on center) prior to pouring the lime slurry. Chains, in this case, act as an enforcement for the lime panels and allowing for the lime panels to move from point to point, specifically allowing to use magnetic holders to move the panels from conveyor to the cable hangers (FIG. 2, item-2) without separating a part.

(2) In FIG. 5: illustrating a typical conveyer (eight feet three inches wide), option-1; where lime slurry pans can be put on top of the moving conveyer or conveyer belt and remove. Option-2; where lime slurry pans are fixed and part of the conveyer.

(3) Lime slurry will harden within one hour. The hardened slurry panels moved from the conveyor to cable hangers and hanged 12 feet on center. Moving cable hangers will provide fresh air contact with the hardened lime panels. This apparatus is illustrated in FIG. 2, Item-2 and FIG. 3; it is a steel structure with cover that will protect panels from the rain (FIG. 3). Optional enclosed environment with dust free and heated air (about 55 F) can be provided for this steel structure or cable hangers, which will prolong reusing the same lime. About 24 hours exposure to the air, lime panels saturating with a carbon dioxide (CO.sub.2), the lime converting back in to a limestone, gaining about 4000 psi compressive strength.

(4) At this stage, limestone panels will be crushed. Limestone separate from the chain and after grinding, filled into a container, comprising of 12 inches diameter, 25 feet high stainless steel 40 schedule pipe; wrapped around with electrical heating coils and renewable electrical power source will be used in this case. Those ovens can be constructed per special orders, designed by an electric oven manufacturing companies. Containers will be equipped with the ability to provide powdered limestone to be dried first under 200 to 300 C. heat, capturing the water vapors. After air and water vapors are removed, the container will be covered and heating process will continue (500 to 600 C.). At this stage, limestone will start turning back to lime and carbon dioxide (CO.sub.2) as per formula in FIG. 4. After carbon dioxide (CO.sub.2) removal and storage the lime will be reused and process will be repeated continuously per FIG. 1.

4. SUMMARY OF THE INVENTION

(5) This method does not need catalyst and does not create leftover byproducts.

(6) In FIG. 2, item-4 and item-5 show about 1000-0x1000-0 or 25-acre lot can support 10 cable hanger loops (item-2) and each loop can support 1600 panels at 12 feet on center. Assuming that one complete cycle can be accomplished in 24 hours (optimum duration of complete cycle will be determined later), which amounts to 6.4 million pounds of lime converted to limestone per day. For methanol production of 1.5 million gallon per day, about 5 million pounds of lime is needed to process each day.

LIST OF FIGURES AND BRIEF DESCRIPTION

(7) FIG. 1: One-line diagram for production of carbon dioxide (CO.sub.2).

(8) FIG. 2: Diagram detailing the conveyor for pans (dimensions: 8 feet by 8 feet and 1 inch thick) in which lime slurry will be poured and create lime panels. Then lime panels moved and hanged from cable hangers to encounter a moving fresh air. Item-1: Plan view of conveyor with 8 feet by 8 feet and 1-inch thick pans. Item-2: Depicts 10 cable hanger loops that lime panels will be hanged 12 feet on center Item-3: Details the overall distance (face to face) for each hanger loop (36 feet.) Item-4: Details the distance between the first and tenth loop (about 1000 feet). Item-5: Details the length of each hanger loop with conveyor loop (about 1000 feet).

(9) FIG. 3: Diagram detailing the cable hanger apparatus structure/support, installed about 100 feet on center. It is a steel structure with cover that will protect panels from the rain. Item 1: Details the 8 feet by 8 feet and 1-inch thick lime panels, which hanged from moving cables Item 2: Depicts the structural support elements that support the moving cable hangers Item 3: Depicts the moving cable Item 4: Depicts the cover placed over the apparatus to protect the lime panels from rain or other falling hazards.

(10) FIG. 4: Screenshot taken from www.scifun.org, detailing the specifics of the reaction from calcium carbonate to calcium oxide and carbon dioxide.

(11) FIG. 5: Illustrating a typical conveyer (eight feet three inches wide), option-1 where lime slurry pans can be put on top of the moving conveyer and remove. Option-2 where lime slurry pans are fixed and part of the conveyer.