GB787504A - Improvements in or relating to the synthesis of urea - Google Patents
Improvements in or relating to the synthesis of ureaInfo
- Publication number
- GB787504A GB787504A GB34595/53A GB3459553A GB787504A GB 787504 A GB787504 A GB 787504A GB 34595/53 A GB34595/53 A GB 34595/53A GB 3459553 A GB3459553 A GB 3459553A GB 787504 A GB787504 A GB 787504A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- iron
- alloys
- manganese
- exceed
- 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
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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/01—Alloys based on copper with aluminium as the next major constituent
-
- 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)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Catalysts (AREA)
Abstract
Urea is prepared by the carbon dioxideammonia synthesis in an apparatus at least one part of which, which is subjected to attack by the hot reaction components or products under pressure, is constructed of or protected by a layer of a copper alloy containing from 3 to 11 per cent of aluminium, with or without one or more further elements the total quantity of which does not exceed 5 per cent. The specified further elements are silicon, nickel, vanadium, chromium, lead, titanium, iron and manganese. The preferred alloys contain little or no iron; when iron and manganese are present, the quantity of iron present should preferably not exceed that of the manganese. The parts of the apparatus which may be constructed or protected by the alloys include the autoclave and valves or pipes through which the reactants or product pass under pressure at temperatures exceeding 130 DEG C. Numerous specific alloys are described (see Group II).ALSO:At least part of the apparatus used in the synthesis of urea from carbon dioxide and ammonia which is subject to attack by the hot reaction components or products under pressure is constructed of or protected by a layer of an aluminium bronze consisting of a copper alloy containing from 3 to 11 per cent of aluminium, with or without one or more further elements the total quantity of which does not exceed 5 per cent. The specified further elements are silicon, nickel, vanadium, chromium, lead, titanium, iron and manganese. Preferably the alloys should contain little or no iron. The parts of the apparatus which may be constructed of or protected by the alloys include the autoclave and pipes and valves through which the reactarts or products pass under pressure at above 130 DEG C. Numerous specific alloys are mentioned (see Group II).ALSO:Aluminium bronzes consist of a copper alloy containing 3-11 per cent of aluminium with or without other elements, e.g. iron, manganese, nickel, chromium, vanadium, lead, titanium and silicon, the total quantity of which does not exceed 5 per cent. The alloys, which are utilizable in the manufacture of urea-synthesis apparatus (see Group IV(b), are preferably poor in iron content and when both iron and manganese are present, the quantity of iron should preferably not exceed that of the manganese. Preferred alloys are those containing 8-10 per cent Al, up to 1 per cent Mn, not more than 0.4 per cent Fe and less than 0.3 per cent of other elements, e.g. Cr, Va, Ti and/or Si, the balance being copper and the percentage ratio of Fe:Mn not exceeding 1:2, including those containing 9-10 per cent Al, 0.2-0.6 per cent Mn, 0.05-0.25 per cent Fe, the percentage ratio of Fe:Mn preferably being between 0.1:1 and 0.45:1, and preferably a total quantity of 0.01-0.1 of Si, Va, Cr and/or Ti. Other alloys mentioned contain 6-8 per cent Al and 1.5-3 per cent Fe or 9-10 per cent Al and 2.75-3.75 per cent Fe, in each case there being at most 0.5 per cent of other elements, the balance being copper.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR954243X | 1952-12-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB787504A true GB787504A (en) | 1957-12-11 |
Family
ID=9487533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34595/53A Expired GB787504A (en) | 1952-12-13 | 1953-12-11 | Improvements in or relating to the synthesis of urea |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2778733A (en) |
| DE (1) | DE954243C (en) |
| FR (1) | FR1068305A (en) |
| GB (1) | GB787504A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2931098A (en) * | 1956-01-26 | 1960-04-05 | Nat Die Casting Company | Method of making a golf club head |
| US3147113A (en) * | 1961-10-27 | 1964-09-01 | Ampco Metal Inc | Aluminum bronze alloy containing vanadium and manganese and having improved wear resistance |
| DE3065931D1 (en) * | 1980-03-03 | 1984-01-26 | Bbc Brown Boveri & Cie | Process for making a memory alloy |
| US4555272A (en) * | 1984-04-11 | 1985-11-26 | Olin Corporation | Beta copper base alloy adapted to be formed as a semi-solid metal slurry and a process for making same |
| US4585494A (en) * | 1984-04-11 | 1986-04-29 | Olin Corporation | Beta copper base alloy adapted to be formed as a semi-solid metal slurry and a process for making same |
| US4661178A (en) * | 1984-04-11 | 1987-04-28 | Olin Corporation | Beta copper base alloy adapted to be formed as a semi-solid metal slurry and a process for making same |
| SE526673C2 (en) * | 2003-08-28 | 2005-10-25 | Sandvik Intellectual Property | Use of a metal sputtering resistant copper alloy |
| SE526448C2 (en) * | 2003-08-28 | 2005-09-20 | Sandvik Intellectual Property | Copper base alloy and its use in boiling environments |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE515510A (en) * | ||||
| US2129689A (en) * | 1936-12-04 | 1938-09-13 | Du Pont | Urea manufacture |
| US2430419A (en) * | 1945-02-02 | 1947-11-04 | Walter W Edens | Welding rod |
-
1952
- 1952-12-13 FR FR1068305D patent/FR1068305A/en not_active Expired
-
1953
- 1953-12-07 US US396729A patent/US2778733A/en not_active Expired - Lifetime
- 1953-12-11 GB GB34595/53A patent/GB787504A/en not_active Expired
- 1953-12-12 DE DEP10983A patent/DE954243C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1068305A (en) | 1954-06-24 |
| US2778733A (en) | 1957-01-22 |
| DE954243C (en) | 1956-12-13 |
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