CN101993075A - Method for rapidly reducing water content in carbon monoxide (CO) - Google Patents
Method for rapidly reducing water content in carbon monoxide (CO) Download PDFInfo
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- CN101993075A CN101993075A CN2010105044169A CN201010504416A CN101993075A CN 101993075 A CN101993075 A CN 101993075A CN 2010105044169 A CN2010105044169 A CN 2010105044169A CN 201010504416 A CN201010504416 A CN 201010504416A CN 101993075 A CN101993075 A CN 101993075A
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Abstract
The invention relates to a method for rapidly reducing water content in carbon monoxide (CO), which is an improvement on an industrial CO dehydration method. The method is characterized in that: after crude CO is dehydrated by condensing at the temperature of not more than 10 DEG C under normal pressure, the CO enters into a dehydration molecular sieve for dehydration. By the combined dehydration method of the invention, the CO with extremely low water content such as 50ppm or even as low as 8 to 20ppm can be steadily obtained; as the preceding dehydration rate is low, most of water can be removed, and the subsequent molecular sieve protective low water content dehydration cycle is obviously prolonged; the water content of the CO is still not more than 20ppm after 24-hour operation; and the dehydration service cycle of the molecular sieve is at least over 24 times that of the prior art. The method of the invention has the advantages of steady dehydration (less than or equal to 50ppm), high economy, high safety, higher industrial application value and particular capacity of obviously saving the using amount of molecular sieves and columns.
Description
Technical field
The present invention is the improvement to industrial CO dewatering, relates in particular to a kind of low cost, security is good, dehydration rate is low dewatering.
Background technology
The CO that in chemical process, needs extremely low moisture content sometimes, for example in the oxo process production process, need to use CO as raw material, because oxo process is very responsive to moisture content, moisture content exceeds standard can influence the oxo process transformation efficiency, even causes oxo process to be difficult to carry out, therefore require raw material moisture content low more good more, for example require CO moisture content to be limited in below the 50ppm, the too high meeting of moisture content can have a negative impact to the oxo process transformation efficiency, and CO moisture content exceeds standard, and influence can reach 10-20% to transformation efficiency.
In technology in the past, as the thick CO that Chinese patent CN1295028 gas phase catalytic formic acid thermo-cracking makes, be to remove a large amount of moisture content, again through molecular sieve 4A type molecular sieve dehydration for example by water condenser.This method in a short time, can satisfy moisture content substantially less than the following requirement of 50ppm, but the cycle is extremely short, generally＜1 hour, therefore common production needs outfit for example to overlap more, and 6-10 cover molecular sieve dehydration tower could satisfy production requirement, guaranteeing that molecular sieve has enough recovery times, otherwise can cause the dehydrating effect instability.And along with the CO flow increases and the rising of envrionment temperature, the full vapour pressure of steam raises, and moisture content can raise among the CO, moisture relative quantity also rises rapidly, this just makes that the molecular sieve dehydration capacity is more inadequate, must increase molecular sieve tower amount, thereby causes the increase of fixed investment and running cost.
The disclosed CO of Chinese patent CN1390783 takes place, purifying technique, proposes high pressure deep cooling dewatering process is adopted in the CO dehydration that makes.At first its dewatering is at " carbon oxygen incomplete combustion " preparation CO; Secondly, adopt high pressure, deep cooling dehydration, not only facility investment is big, and peace property is poor entirely, and the running cost height; Besides, the deep cooling dehydration also easily causes condenser to freeze, and not only can cause condenser to stop up, and influence heat exchanger effectiveness.And this dehydration precision is still not high enough, is reported to 100ppm, still is difficult to satisfy some and for example hangs down≤the 50ppm processing requirement moisture requirement is special.
Above-mentioned deficiency still has is worth improved place.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provides a kind of low cost, security good, and the lower 50ppm of water content makes the method that moisture content descends rapidly among the CO.
The object of the invention realizes, through a large amount of observations, analysis to CO band moisture content, discovery causes that CO moisture content is mainly the gasification of water under the envrionment temperature and produces, be the water-vapo(u)r saturation steam under the envrionment temperature, therefore technical solution of the present invention for example makes CO pass through lyophilizer by taking to reduce CO temperature way, saturated steam is separated out through being condensed into liquid, reach and make that moisture content descends rapidly among the CO, condensation is separated out moisture content and is then discharged by condenser, CO after the condensation dehydration is again through molecular sieve dehydration, reach extremely low moisture content, thereby realize the object of the invention.Specifically, the method that the present invention descends moisture content among the CO rapidly after it is characterized in that under normal pressure thick CO is not higher than 10 ℃ of condensations dehydrations by condensing temperature, enters the dehydration molecular sieve dehydration again.
CO condensation dehydration temperaturre, the low more in theory saturated moisture content that helps more removing wherein, but test finds that temperature is low excessively, then can cause condenser surface to freeze, not only influence heat exchange efficiency, reduce dewatering efficiency on the contrary, and also can cause condenser because of the obstruction of freezing when serious, lose function.Industrial application is determined in test, the CO condensing temperature suits low as far as possible comparatively economical more than the condenser freezing temperature, test more fortunately under the normal pressure CO condensing temperature can satisfy the requirement that removes most of moisture content substantially at 0-10 ℃, can satisfy the to the utmost point low moisture content requirement of back molecular sieve long period dehydration, better economic is arranged again.Condensation method is a kind of to be preferably and to adopt refrigerating fulid heat exchange condensation, chilled liquid temperature better to be controlled at-5-5 ℃.
The present invention makes the method that moisture content descends rapidly among the CO, with respect to prior art, owing to adopt thick CO is often forced down earlier warm condensation dehydration, again with the molecular sieve combination dewatering that further dewaters, not only can stablize for example CO of the extremely low moisture content of 50ppm of the extremely low moisture content of acquisition, low energy is taken off to water ratio 8-20ppm, and because preceding road dehydration water ratio is low, can remove most of moisture content, make also the low moisture content spin cycle of follow-up molecular sieve protection obviously prolong, move 24 hours detection CO water content and still be not more than 20ppm that the molecular sieve dehydration life cycle is at least more than 24 times of prior art, can save the molecular sieve tower greatly, and the regeneration working cost.The inventive method not only has stable dehydration to≤50ppm, and economy and security are good, have bigger industrial application value, particularly can obviously save molecular sieve tower consumption.
Below in conjunction with a specific embodiment; essence of the present invention is further understood in exemplary illustration and help; but the embodiment detail only is for the present invention is described; do not represent the present invention to conceive whole technical schemes down; therefore should not be construed as the technical scheme qualification total to the present invention, some are In the view of the technician, and the unsubstantiality that does not depart from the present invention's design increases and/or change; for example simple the change or replacement of technical characterictic to have same or similar technique effect all belongs to protection domain of the present invention.
Embodiment
The hot cracked thick CO that makes of embodiment: HCOOH, 30 ℃ of envrionment temperatures record its water ratio 3.22wt%.With flow 30m
3/ h, pressure 0.03Mpa make the CO temperature reduce to 8 ℃ by 0 ℃ of refrigerating fulid medium interchanger (freezer condenser), go out condenser water ratio 0.81wt%, pass through 0.15m again
3The 4A molecular sieve dewaters deeply, and the detection water ratio is 10ppm.The molecular sieve operation detected in 24 hours, dehydration CO water ratio 15ppm.
To those skilled in the art; under this patent design and specific embodiment enlightenment; some distortion that can directly derive or associate from this patent disclosure and general knowledge; those of ordinary skills will recognize also can adopt additive method; or the substituting of known technology commonly used in the prior art; and the equivalence of feature changes or modification; mutual various combination between feature; for example low temperature is 0-10 ℃ of change, the change of molecular sieve model, or the like unsubstantiality change; can be employed equally; can both realize this patent representation function and effect, launch for example no longer one by one to describe in detail, all belong to this patent protection domain.
This patent said " normal pressure " also comprises pressure-fired common on the chemical industry meaning, does not have substantial differences between the two.
Claims (5)
1. the method that moisture content among the CO is descended rapidly after it is characterized in that under normal pressure thick CO is not higher than 10 ℃ of condensations dehydrations by condensing temperature, enters the dehydration molecular sieve dehydration again.
2. according to the described method that makes the rapid decline of moisture content among the CO of claim 1, it is characterized in that the CO condensing temperature is more than the condenser freezing temperature.
3. according to the described method that makes the rapid decline of moisture content among the CO of claim 2, it is characterized in that being 0-10 ℃ under the CO condensing temperature normal pressure.
4. according to claim 1, the 2 or 3 described methods that moisture content among the CO is descended rapidly, it is characterized in that condensation adopts the refrigerating fulid heat exchange, chilled liquid temperature is controlled at-5-5 ℃.
5. according to the described method that makes the rapid decline of moisture content among the CO of claim 4, the molecular sieve that it is characterized in that dewatering is the 4A molecular sieve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105044169A CN101993075A (en) | 2010-10-09 | 2010-10-09 | Method for rapidly reducing water content in carbon monoxide (CO) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105044169A CN101993075A (en) | 2010-10-09 | 2010-10-09 | Method for rapidly reducing water content in carbon monoxide (CO) |
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| CN101993075A true CN101993075A (en) | 2011-03-30 |
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| CN2010105044169A Pending CN101993075A (en) | 2010-10-09 | 2010-10-09 | Method for rapidly reducing water content in carbon monoxide (CO) |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2100811C (en) * | 1992-08-19 | 1999-01-19 | Akhilesh Kapoor | Hydrogen and carbon monoxide production by partial oxidation of hydrocarbon feed |
| CN1295028A (en) * | 1999-11-03 | 2001-05-16 | 中国科学院大连化学物理研究所 | Gas phase catalytic formic acid-dewatering process for preparing high-purity CO |
| CN1390783A (en) * | 2002-06-21 | 2003-01-15 | 东营南开精细化工科技有限公司 | Process for generating and purifying CO |
-
2010
- 2010-10-09 CN CN2010105044169A patent/CN101993075A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2100811C (en) * | 1992-08-19 | 1999-01-19 | Akhilesh Kapoor | Hydrogen and carbon monoxide production by partial oxidation of hydrocarbon feed |
| CN1295028A (en) * | 1999-11-03 | 2001-05-16 | 中国科学院大连化学物理研究所 | Gas phase catalytic formic acid-dewatering process for preparing high-purity CO |
| CN1390783A (en) * | 2002-06-21 | 2003-01-15 | 东营南开精细化工科技有限公司 | Process for generating and purifying CO |
Non-Patent Citations (2)
| Title |
|---|
| 余晖等: "一氧化碳气体干燥过程的研究", 《湖南化工》 * |
| 高洪建: "一氧化碳干燥技术及应用", 《江西化工》 * |
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Application publication date: 20110330 |