Method for liquefying carbon dioxide
OwnerHaytham SAYAH, Christelle BOU MALHAM +1inventors
InventorsHaytham SAYAH, Christelle BOU MALHAM, Philippe Maria KHAIRALLAH
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Abstract
The present disclosure relates to a method for producing liquid carbon dioxide from a gas comprising more than 70% by volume of carbon dioxide, and comprises the following consecutive steps: one or more filtration steps then one or more steps of cooling the gas, then a step of overpressurising the gas, one or more steps of cooling the gas, then a step of compressing the gas, then one or more filtrations then a step of drying the gas, then one or more filtrations then a step of liquefying the gas, and then a step of distilling the fluid so as to isolate the liquefied carbon dioxide.
Claims14
A method for producing liquid carbon dioxide from a gas containing more than 70% by volume of carbon dioxide comprising the following successive steps:
- a) one or more filtration steps using activated carbon, then
- b) one or more gas cooling steps, the temperature of the gas at the end of this step being between 1° and 20° C., then
- c) a gas overpressure step, the gas pressure at the end of this step being between 1.05 and 1.40 bar,
- d) one or more gas cooling steps, then
- e) a gas compression step, the gas pressure at the end of this step being between 15 and 25 bars, then
- f) one or more filtrations, then
- g) a gas drying step, then
- h) one or more filtrations, then
- i) a gas liquefaction step, the fluid at the end of this step being at a temperature between −25° C. and −35° C., then
- j) a step of distilling the fluid so as to isolate the liquefied carbon dioxide,
- k) a step of recovering carbon dioxide in liquid form from step j),
- l) a step of liquefaction of the gas recovered at the top of the distillation column in step j), the gas at the end of this step being at a temperature between −35° C. and −45° C., then
- m) a step of separating the liquid phase from the gas phase of the fluid resulting from the liquefaction step 1), then
- n) a step of recycling the liquid phase resulting from the separation of step m) to the distillation step j).
A device for producing liquid carbon dioxide (1) from a gas including more than 70% by volume of carbon dioxide, characterized in that it includes the following elements, fluidically connected to one another and in this order:
- at least two filtration units (F101, F102, F103) mounted in series,
- a heat exchanger (E101) to cool the gas,
- a booster (SP),
- a buffer tank (TK101),
- at least two exchangers (E102, E103) mounted in series,
- an oil-free dry compressor (CP),
- at least one filtration unit (F104, F105),
- a drying device (D), so as to eliminate traces of humidity,
- at least one filtration unit (F106),
- a buffer tank (TK102),
- at least one heat exchanger (E104),
- a liquefier (E105),
- a distillation column (DC),
- the foot of the distillation column (DC) being fluidically connected to a pipe (C2) allowing the recovery of liquefied carbon dioxide,
- the head of the distillation column (DC) being connected to a liquefier (E106) so as to liquefy the carbon dioxide remaining in the gas, then connected to a separator (Sep),
- a pipe (C3) connects the separator (Sep) to the distillation column (DC), allowing the recycling of the liquid phase mainly including carbon dioxide.
Dependencies are inferred from the claim text.