DEP0003097DA - Process for the production of urea from carbon dioxide and ammonia - Google Patents
Process for the production of urea from carbon dioxide and ammoniaInfo
- Publication number
- DEP0003097DA DEP0003097DA DEP0003097DA DE P0003097D A DEP0003097D A DE P0003097DA DE P0003097D A DEP0003097D A DE P0003097DA
- Authority
- DE
- Germany
- Prior art keywords
- carbon dioxide
- gas
- urea
- carbon
- ammonia
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims description 20
- 239000004202 carbamide Substances 0.000 title claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims description 8
- 239000001569 carbon dioxide Substances 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000000034 method Methods 0.000 title claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims description 3
- 239000007789 gas Substances 0.000 claims description 11
- JJWKPURADFRFRB-UHFFFAOYSA-N Carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000003786 synthesis reaction Methods 0.000 claims description 4
- 230000002194 synthesizing Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- 230000003197 catalytic Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 4
- 229910052799 carbon Inorganic materials 0.000 claims 2
- 239000003245 coal Substances 0.000 claims 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims 2
- 210000002700 Urine Anatomy 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 230000003213 activating Effects 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 claims 1
- 239000010949 copper Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 229910052759 nickel Inorganic materials 0.000 claims 1
- 239000011819 refractory material Substances 0.000 claims 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 4
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 3
- 229910000570 Cupronickel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- -1 copper-nickel Chemical compound 0.000 description 2
- 239000011133 lead Substances 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Description
BADISCHB A N Ϊ L Ϊ S* Is SOBA-HBADISCHB A N Ϊ L Ϊ S * Is SOBA-H
Unser Zeichen: O.1?.15 229.Our reference: O. 1 ? .15 229.
ρ 3097 IVo/12 ο Ludwigshafen a.iih'. ,άθα I6.bept.l946ρ 3097 IVo / 12 ο Ludwigshafen a.iih '. , άθα I6.bept.l946
Z /BoZ / Bo
Verfahren zur Herstellung von Harnstoff aus
K. 0 hl e η J. i ο χ._, d un i Ammo ni ak,Process for the production of urea from
K. 0 hl e η J. i ο χ._, d un i Ammo ni ak,
Bei der Synthese von Harnstoff durch Umsetzung von Kohlendioxid und Ammoniak, unter -i-ruck in der Hitze besteht bekanntlich
die Schwierigkeit 5 dass aie werks^oife dar Apparate starken Angriffen ausgesetzt und daher öfter erneuurungsbedürftig sind. Man sucht
diesen Mangeln dadurch zu begegnen, aasε man die gefährdeten Teile der Vorrichtung aus Spezialstählen, Kupi er-iiickellegierungen , Blei
oder Silber herstellt oaer sie ^iamit auskleidet.In the synthesis of urea by converting carbon dioxide and ammonia, under -i-jerk in the heat is known to exist
the difficulty 5 that all the equipment is exposed to strong attacks and therefore often in need of renewal. One tries to counteract these deficiencies by producing the endangered parts of the device from special steels, copper-nickel alloys, lead or silver or lining them with them.
Es hat sich nun gezeigt, dass die Korrosion der Vorrichtung nicht lediglich auf das .aeakt ions gemisch selbst zurückzuführen ist,
sondern dass hierfür auch kleine Mengen von Verunreinigungen verantwortlich sind, aie bei der Herstellung der Ausgangsstoffe nach den
üblichen Verfahren nicht restlos; entfernt weraen, und es wurde gefunden., dass sich eine wesentliche Verbesserung aer Haltbarkeit aer
Vorrichtung ergibt, wenn man nicht nur für die F'ernhaltung von Sauerstoff sorgt, wie dies bereits früher vorgeschlagen worden ist,
sondern wenn man die Aus gangs gase vor ihrer Umsetzung zu Harnstoff vor allem auch von Schweielverbindungen sorgfältig befreit, -dabei .
ist es wichtig, ausser anorganischen Schwefelverbindungen, wie
Schwefelwasserstoff, auch den., organisch gebundenen schwefel, insbesondere das Kohlenoxysulfid zu entfernen, das sich durch1.,eg im Kohlendioxid
vorfindet, wenn dieses in der bekannten Weise durch katalytische Umsetzung von Wassergas mit Wasserdampf gewonnen ist. Kohlenoxysulfid
selbst gefährdet zwar nicht die hier in i'rage' kommenden Werkstoffe wie Blei, Silber oder Kupfer-Nielse lie gierungen, es setzt
sich aber, wie sich ergeben hat, unter den Bedingungen der Harnstoffsynthese zu dem schädlichen Schwefelwasserstoff um. Man findet
nämlich in dem xteakt ions produkt oder in den Abgasen der Harnstoffsynthese auch dann Schwefelwasserstoff, wenn man aas Kohlendioxyd
vor der Umsetzung zu Harnstoff sorgfältig von Schwefelwasserstoff
gereinigt hat, es sei denn, man hat im Sinn der vorliegenden ^r-It has now been shown that the corrosion of the device is not only due to the reaction mixture itself, but that small amounts of impurities are also responsible for this, aie not completely in the production of the starting materials according to the usual processes; removed, and it was found that there was a substantial improvement in aerodynamic durability
Device results, if one does not only take care of the elimination of oxygen, as has been suggested earlier,
but if the starting gases are carefully freed from welding compounds before they are converted into urea, -this. it is important, besides inorganic sulfur compounds, like
To remove hydrogen sulfide, also the organically bound sulfur, in particular the carbon oxysulfide, which is found in carbon dioxide as a result of 1 , eg, if this is obtained in the known manner by catalytic conversion of water gas with water vapor. Carbon oxysulphide itself does not endanger the materials in question, such as lead, silver or copper-nickel alloys, but it turns out to be harmful hydrogen sulphide under the conditions of urea synthesis. In fact, hydrogen sulfide is found in the reaction product or in the exhaust gases from urea synthesis even if carbon dioxide is used
before converting to urea carefully remove hydrogen sulfide
has cleaned, unless one has in the sense of the present ^ r-
Claims (1)
Family
ID=
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