DE1808097A1 - Inhibition of corrosion by synthesis products in plants for - synthesising urea from nh3 and co2 - Google Patents

Inhibition of corrosion by synthesis products in plants for - synthesising urea from nh3 and co2

Info

Publication number
DE1808097A1
DE1808097A1 DE19681808097 DE1808097A DE1808097A1 DE 1808097 A1 DE1808097 A1 DE 1808097A1 DE 19681808097 DE19681808097 DE 19681808097 DE 1808097 A DE1808097 A DE 1808097A DE 1808097 A1 DE1808097 A1 DE 1808097A1
Authority
DE
Germany
Prior art keywords
urea
plants
corrosion
synthesising
inhibition
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.)
Pending
Application number
DE19681808097
Other languages
German (de)
Inventor
Dipl-Chem Dr Gottfr Nettesheim
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.)
Union Rheinische Braunkohlen Kraftstoff AG
Original Assignee
Union Rheinische Braunkohlen Kraftstoff 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
Priority claimed from DE19681800755 external-priority patent/DE1800755A1/en
Application filed by Union Rheinische Braunkohlen Kraftstoff AG filed Critical Union Rheinische Braunkohlen Kraftstoff AG
Priority to DE19681808097 priority Critical patent/DE1808097A1/en
Publication of DE1808097A1 publication Critical patent/DE1808097A1/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • 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)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Corrosion by synthetic products is synthesis of urea from NH3 and CO2. Inhibited by addition of a minor amount of a solution of NH4NO2 obtained by reacting HNO2 with NH3 in H2O in the presence of CO2.

Description

Verfahren zur Verhinderung der Korrosion durch Sy.nthes.produkte in Anlagen zur Synthese von Harnstoff Zusatspatent zu . . . . (P 18 00 755.1) Gemäß dem Hauptpatent . . . . . (P 18 00 755.1) kann die durch Syntheseprodukte an Anlagen zur Synthese von Harnstoff aus Ammoniak und Kohlendioxid hervorgerufene Korrosion weitgehend verhindert werden, wenn man für die Anwesenheit von geringen Mengen, insbesondere über etwa 4 ppm, bezogen auf die wässrige Lösung, eines in den Produkten löslichen Nitrits, z. B. von Ammonnitrit, sorgt. Process to prevent corrosion by Sy.nthes.products Additional patent in plants for the synthesis of urea. . . . (P 18 00 755.1) According to the main patent. . . . . (P 18 00 755.1) can through synthesis products on plants for the synthesis of urea from ammonia and carbon dioxide caused corrosion largely prevented if one is responsible for the presence of small amounts, especially above about 4 ppm, based on the aqueous solution, one in the products soluble nitrite, e.g. B. of ammonium nitrite provides.

Es wurde nun gefunden, dass man mit besonderem Vorteil Lößungen von Ammonnitrit als korrosionehemmende Zusätze benutzen kann, die durch Umsetzung von Stickoxiden mit Ammoniak in Wasser in Gegenwart von Kohlendioxid erhalten wurden. Derartige wässrige Lösungen besitzen einen sehr hohen Gehalt an Ammonnitrit. Während z,B. durch Einleiten von gasförmigem N02 in aamoniakhaltiges Wasser nur Ausbeuten von bis etwa 60 % der Theorie an Nitrit zu erzielen waren, konnten bei der erfindungsgemässen Umsetzung Ausbeuten von Nitrit von fast 100 % der Theorie erhalten werden. Die Umsötzung kann in verschiedener Weise erfolgen. So kann man z. B. das Kohlendioxid zusammen mit den Stickoxid in Ammoniakwasser einleiten. Man kann dieses auch zuvor it Kohlendioxid versetzen. Günstig sind z. Bo Lösungen die pro Mol Ammoniak 1 - 2 Mole Kohlendioxid enthalten, doch kunden auch hdhere Verhältnisse 6ewAhlt werden It has now been found that solutions of Ammonium nitrite can be used as corrosion-inhibiting additives, which can be obtained by reacting Nitrogen oxides with ammonia in water in the presence of carbon dioxide were obtained. Such aqueous solutions have a very high content of ammonium nitrite. While z, B. by introducing gaseous NO2 into water containing ammonia only yields of up to about 60% of theory of nitrite could be achieved with the inventive Implementation yields of nitrite of almost 100% of theory can be obtained. The implementation can be done in a number of ways. So you can z. B. the carbon dioxide together Introduce with the nitric oxide in ammonia water. You can do this beforehand with carbon dioxide offset. Favorable are z. Bo solutions contain 1 - 2 moles of carbon dioxide per mole of ammonia included, but higher ratios can also be selected

Claims (1)

Patentanspruch: Verfahren zur Verhinderung der Korrosion durch Syntheseprodukte an Anlagen zur Synthese von Harnstoff aus Ammoniak und Kohlendioxid gemäss Hauptpatent . . . . (P 18 00 755.1) durch Zusatz von geringen Mengen eines in den Produkten löslichen Nitrits, dadurch gekennzeichnet, dass man eine Lösung von Ammonnitrit zusetzt, die durch Umsetzung von Stickoxiden mit Ainioniak in Wasser in Gegenwart von Kohlendioxid erhalten wurde.Claim: Process for preventing corrosion by synthetic products on plants for the synthesis of urea from ammonia and carbon dioxide according to the main patent . . . . (P 18 00 755.1) by adding small amounts of one in the products soluble nitrite, characterized in that one is a solution of ammonium nitrite adds that by reacting nitrogen oxides with Ainioniak in water in the presence from carbon dioxide.
DE19681808097 1968-10-03 1968-11-09 Inhibition of corrosion by synthesis products in plants for - synthesising urea from nh3 and co2 Pending DE1808097A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19681808097 DE1808097A1 (en) 1968-10-03 1968-11-09 Inhibition of corrosion by synthesis products in plants for - synthesising urea from nh3 and co2

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19681800755 DE1800755A1 (en) 1968-10-03 1968-10-03 Preventing corrosion in plant producing - urea
DE19681808097 DE1808097A1 (en) 1968-10-03 1968-11-09 Inhibition of corrosion by synthesis products in plants for - synthesising urea from nh3 and co2

Publications (1)

Publication Number Publication Date
DE1808097A1 true DE1808097A1 (en) 1970-06-25

Family

ID=25756205

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19681808097 Pending DE1808097A1 (en) 1968-10-03 1968-11-09 Inhibition of corrosion by synthesis products in plants for - synthesising urea from nh3 and co2

Country Status (1)

Country Link
DE (1) DE1808097A1 (en)

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