DE740847C - Process for the production of urea - Google Patents

Process for the production of urea

Info

Publication number
DE740847C
DE740847C DEI67919D DEI0067919D DE740847C DE 740847 C DE740847 C DE 740847C DE I67919 D DEI67919 D DE I67919D DE I0067919 D DEI0067919 D DE I0067919D DE 740847 C DE740847 C DE 740847C
Authority
DE
Germany
Prior art keywords
lead
urea
corrosion
production
antimony
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
Application number
DEI67919D
Other languages
German (de)
Inventor
Dr Wilhelm Geisel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEI67919D priority Critical patent/DE740847C/en
Application granted granted Critical
Publication of DE740847C publication Critical patent/DE740847C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C275/00—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C275/04—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of urea groups bound to acyclic carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
    • C07C273/04—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds from carbon dioxide and ammonia
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)

Description

Verfahren zur Herstellung von Harnstoff Bei der Herstellung von Harnstoff aus Ammoniak und Kohlendiox-v d oder deren Verbindungen unter Druck und bei erhöhter Temperatur treten bekanntlich Korrosionserscheinungen an den Umsetzungsbehältern. Kühlern und Rohrleitungen auf. Nach einem bekannten Vorschlag soll die Korrosion von Chromstählen bei der flarnstoffsynthese ,dadurch vermieden werden"daß man der korrodierenden Reaktionsflüssigkeit .eines der Metalle Kupfer, Wismut, Kobalt, Eisen, Vanadin, Quecksilber oder Mangan einverleibt. Nach einem anderen Vorschlag soll man als Zusatzstoffe für den gleichen Zweck negativ geladene kolloidale Teilchen benutzen. Außer gewissen 1-etallsalzen wurden ..dabei auch organische Stoffe genannt. Schließlich -ist für den gleichen Zweck eine Behandlung der gefährdeten Oberflächen mit einer kupferhaltigen Flüssigkeit vorgeschlagen worden. Bei allen diesen Verfahren ist man also auf einen besonderen Zusatz von Fre.m.dstoffen angewiesen, die zu einer Verunreinigung des Erzeugnisses führen. Die Beseitigung dieser Fremdstoffe zwecks Gewinnung von reinem Harnstoff ist nicht immer leicht. Nach' einem anderen Verfahren soll man zur Erreichung eines Korrosionsschutzes einen gewissen AtnmoniaküherschuB in der Schmelze einhalten. Dieses Ammoniak muß von dem Reaktionsprodukt abgetrennt und dem Verfahren aufs neue zugeführt werden.Process for the production of urea In the production of urea from ammonia and carbon dioxide or their compounds under pressure and at increased pressure As is known, corrosion occurs on the reaction vessels at high temperature. Coolers and pipelines. According to a well-known proposal, the corrosion of chromium steels in the synthesis of flurea, thereby avoiding "that one of the corrosive reaction liquid. one of the metals copper, bismuth, cobalt, iron, Vanadium, mercury or manganese incorporated. Another suggestion is supposed to negatively charged colloidal particles are used as additives for the same purpose use. In addition to certain 1-metal salts ... organic substances were also mentioned. Finally, for the same purpose, the endangered surfaces are treated with a copper-containing liquid has been proposed. In all of these procedures one is therefore dependent on a special addition of substances that lead to a Contamination of the product. The purpose of eliminating these foreign matter Obtaining pure urea is not always easy. According to a different procedure a certain amount of atmospheric water should be used to achieve corrosion protection adhere to the melt. This ammonia must be separated from the reaction product and fed back into the process.

Es wurde nun gefunden, daß man bei der Harnstoffsvnthese die Widerstandsfähigkeit der gleichfalls schon bekannten Bleiauskleidungen korrosionsgefährdeter Vorrichtungsteile erheblich steigern kann, wenn man Antirnon enthaltendes Blei für die Auskleidung verwendet. Schon verhältnismäßig kleine Antimongehalte zeigen eine beträchtliche Wirkung. Der- Grad :der Korrosion, ausgedrückt-- durch Volumenabnahme des Werkstoffs in lLu.bikzentiitreter je Quadratmeter Angriffsfläche -an einem "Tag, beträgt beispielsweise -bei üblichem Blei (Bleigehalt .9.9,9°e) aiL,r-iner#liestimmten Stelle der Vorrichtung 6,5. Bei einem Blei mit einem Antimonzusatz von 5°1° beträgt er aber unter den gleichen Betriebsbedingungen nur 2.o8.It has now been found that the urea synthesis increases the resistance the already known lead linings of corrosion-endangered device parts Can increase significantly if you use lead containing Antirnon for the lining used. Even relatively small antimony contents show a considerable one Effect. The degree of corrosion, expressed by the decrease in the volume of the material in lLu.bikzentiitreter per square meter of attack surface - on a "day, is for example -with common lead (lead content .9.9.9 ° e) aiL, r-in the # reads at the right point of the device 6.5. In the case of a lead with an antimony addition of 5 ° 1 °, however, it is below the same Operating conditions only 2.o8.

Eine Auskleidung aus Blei mit einem Antimongehalt von io°1° erlitt an einer anderen Stelle der Anlage eine Korrosion von nur o,81, während eine Auskleidung aus üblichem Blei an derselben Stelle eine Korrosion von 5.1 zeigte.A lead lining with an antimony content of 10 ° 1 ° suffered at another point in the plant a corrosion of only 0.81, while a lining from common lead showed a corrosion of 5.1 at the same point.

Der Angriff an einer Antimon enthaltenden Bleioberfläche tritt zudem nicht wie bei gewöhnlichem Blei in einzelnen besonders ausgeprägten Vertiefungen auf, er ist vielmehr auf die gesamte Fläche verteilt und daher auch aus diesem Grunde weniger schädlich. Eine 5°1° Antimon enthaltende Bleiauskleidung hat also eine mindestens dreimal, eine io°/° Antimon enthaltende Bleiatiskleidting eine mindestens sechsanal so lange Lebensdauer wie eine gewöhnliche Bleiatisklei,hing.The attack on a lead surface containing antimony also occurs not, as is the case with ordinary lead, in individual, particularly pronounced depressions on, it is rather distributed over the entire surface and therefore also for this reason less harmful. A lead lining containing 5 ° 1 ° antimony therefore has at least one three times, a lead tar coating containing 10% antimony, an at least six channels as long lifespan as an ordinary lead iron clot.

Claims (1)

PATENTANSPRUCH: Herstellung von Harnstoff aus Aininoniak und Kohlendioxvd unter Verwendung von Bleiauskleidungen an korrosionsgef.ihrdeten Vorrichtungsteilen, fladurch gekennzeichnet, daß die Auskleidungen au Antimon enthaltendem Blei ausgeführt sind. Zur Abgrenzung des Anmeldungsgegenstandes vorn Stand der Technik sind im Erteilungsverfahren folgende Druckschriften in Betracht gezogen «-orden: LTS A.-Patetitschriften ....... Zi'. i 875 982, 2 129 689, 1 986 973; Chemisches Zentralblatt (,i938). 1, S.;;7# Abs. 3.PATENT CLAIM: Production of urea from ammonia and carbon dioxide using lead linings on corrosion-prone device parts, characterized in that the linings are made from lead containing antimony. To distinguish the subject of the application from the state of the art, the following documents have been considered in the granting procedure: LTS A. Patetitschriften ....... Zi '. i 87 5,982, 2,129,689, 1,986,973; Chemisches Zentralblatt (, 1938). 1, p. ;; 7 # Paragraph 3.
DEI67919D 1940-09-24 1940-09-25 Process for the production of urea Expired DE740847C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEI67919D DE740847C (en) 1940-09-24 1940-09-25 Process for the production of urea

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE238331X 1940-09-24
DEI67919D DE740847C (en) 1940-09-24 1940-09-25 Process for the production of urea

Publications (1)

Publication Number Publication Date
DE740847C true DE740847C (en) 1944-12-18

Family

ID=25766404

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI67919D Expired DE740847C (en) 1940-09-24 1940-09-25 Process for the production of urea

Country Status (1)

Country Link
DE (1) DE740847C (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1875982A (en) * 1931-08-15 1932-09-06 Du Pont Prevention of corrosion
US1986973A (en) * 1930-11-17 1935-01-08 Du Pont Prevention of corrosion in urea synthesis
US2129689A (en) * 1936-12-04 1938-09-13 Du Pont Urea manufacture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1986973A (en) * 1930-11-17 1935-01-08 Du Pont Prevention of corrosion in urea synthesis
US1875982A (en) * 1931-08-15 1932-09-06 Du Pont Prevention of corrosion
US2129689A (en) * 1936-12-04 1938-09-13 Du Pont Urea manufacture

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