Method and device for producing carbon monoxide by cryogenic distillation
A carbon monoxide and low-temperature technology, applied in the direction of carbon monoxide, chemical instruments and methods, separation methods, etc., can solve problems such as difficulty in implementation, cold balance imbalance, etc., and achieve the effect of ensuring accuracy and facilitating stable operation
Inactive Publication Date: 2010-01-20
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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- Application Information
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Problems solved by technology
Unfortunately, the tests done for this show that it is difficult to implement due to cold balance imbalance
Method used
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[0034] exist figure 1 , the synthesis gas stream 1 is sent to a purification unit 3 to remove most of the impurities, especially moisture and carbon dioxide. The gas mixture includes hydrogen and carbon monoxide as major constituents, and optionally minor constituents such as nitrogen and methane, and includes moisture and carbon dioxide as impurities.
[0035] The purification unit 3 comprises two adsorbers 4A, 4B arranged side by side, which alternately serve to purify the gas mixture by adsorption. Each adsorber includes adsorbent material arranged in layers. Adsorbers not used for adsorption are regenerated with gas, optionally with gas from the cryogenic distillation unit. During the first step, the elution phase, the adsorber 4A receives only a part of the stream to be purified, approximately 5% of the stream, the rest of the stream to be purified is sent to the adsorber 4B. When the adsorption of carbon monoxide by the adsorber 4A reaches saturation, the second step ...
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The invention relates to a method for producing carbon monoxide consisting, during an adsorption step, in using N adsorbers (4A, 4B), wherein N is equal to greater than two, each of which follows, at an offset; the same period T cycle during which adsorption and regeneration phases succeed each other, in exposing, at the beginning of the adsorption phase, each adsorber to an eluting phase during which only a part of a nominal flowrate of the mixture is transferred to the adsorber until said adsorber is substantially carbon monoxide saturated while at least the second adsorber is maintained in the adsorption phase and a purified gaseous mixture is partially liquefied for producing a liquefied gaseous mixture, in storing said mixture in a capacity (7) and in transferring the liquefied gaseous mixture from the capacity to at least one column (11) for the separation thereof into a carbon monoxide rich product and, during at least one part of the adsorber eluting phases, the liquid level in the container is decreased and during at lest one part of the cycle outside of the eluting periods, said level is increased.
Description
technical field [0001] The present invention relates to a method and equipment for producing carbon monoxide by cryogenic distillation. Background technique [0002] In processes for the production of carbon monoxide and / or hydrogen by cryogenic distillation, the gas mixture to be separated must be purified to remove moisture and residual carbon dioxide which tend to freeze at low temperatures and thus clog the heat exchangers of the cold box. [0003] Moisture and carbon dioxide are typically trapped by passing the feed gas through a drying unit containing various adsorbents, including molecular sieves. [0004] In fact, molecular sieves have the property of adsorbing large amounts of carbon monoxide. As long as molecular sieves are not saturated for carbon monoxide adsorption, this characteristic strongly affects the (carbon monoxide) production rate at the start of each adsorption cycle. These fluctuations in production can be detrimental to downstream units. [0005] ...
Claims
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IPC IPC(8): F25J3/02B01D53/04C01B32/40
CPCF25J2290/40F25J2270/08B01D2259/402F25J3/0252F25J2200/76F25J3/0223F25J2270/04F25J2235/60F25J2270/02B01D2257/502F25J2205/04F25J2200/70B01D2259/416Y10S62/92B01D2256/20F25J2205/30F25J2280/02F25J2290/62F25J2270/24F25J3/0233F25J2205/66B01D53/04F25J3/0261
Inventor G·特谢拉J·佩龙J·劳赫N·艾克-贝劳德J·比利
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE