GB645600A - Improvements in or relating to the production of melamine - Google Patents
Improvements in or relating to the production of melamineInfo
- Publication number
- GB645600A GB645600A GB2918448A GB2918448A GB645600A GB 645600 A GB645600 A GB 645600A GB 2918448 A GB2918448 A GB 2918448A GB 2918448 A GB2918448 A GB 2918448A GB 645600 A GB645600 A GB 645600A
- Authority
- GB
- United Kingdom
- Prior art keywords
- melamine
- solution
- aqueous liquor
- alkaline earth
- earth metal
- 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
- 229920000877 Melamine resin Polymers 0.000 title abstract 8
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 title abstract 8
- 238000001953 recrystallisation Methods 0.000 abstract 3
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract 2
- 239000003518 caustics Substances 0.000 abstract 2
- 238000001914 filtration Methods 0.000 abstract 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- 239000003513 alkali Substances 0.000 abstract 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 abstract 1
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 abstract 1
- -1 alkaline earth metal salt Chemical class 0.000 abstract 1
- 229910052788 barium Inorganic materials 0.000 abstract 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 239000000706 filtrate Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract 1
- 150000004679 hydroxides Chemical class 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000012452 mother liquor Substances 0.000 abstract 1
- 229910052700 potassium Inorganic materials 0.000 abstract 1
- 239000011591 potassium Substances 0.000 abstract 1
- 229920006395 saturated elastomer Polymers 0.000 abstract 1
- 239000002002 slurry Substances 0.000 abstract 1
- 229910052708 sodium Inorganic materials 0.000 abstract 1
- 239000011734 sodium Substances 0.000 abstract 1
- 239000002195 soluble material Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Pure melamine is prepared from melamine containing caustic soluble impurities by mixing the crude melamine at an elevated temperature with an aqueous liquor containing melamine in solution, filtering off undissolved material, adding to the filtrate an alkali metal hydroxide or alkaline earth metal hydroxide, and cooling to recrystallize melamine from the solution, the amount of hydroxide added being sufficient to retain in solution at the recrystallization temperature those caustic soluble materials not removed during the filtration but not in excess of that amount which will raise the pH to 13. Preferably the initial aqueous liquor is saturated with melamine at the recrystallization temperature, and the mother liquors from the final recrystallization are used for this purpose; in this case, the mother liquor is neutralized with acid, e.g. hydrochloric, before re-use. The aqueous liquor may contain up to 5 per cent of an alkali or alkaline earth metal salt. The hydroxides may be potassium, sodium, calcium or barium. The process may be operated batch-wise or continuously and a decolourizing agent may be used. The initial crude melamine may be in the form of a slurry with water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2918448A GB645600A (en) | 1948-11-10 | 1948-11-10 | Improvements in or relating to the production of melamine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2918448A GB645600A (en) | 1948-11-10 | 1948-11-10 | Improvements in or relating to the production of melamine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB645600A true GB645600A (en) | 1950-11-01 |
Family
ID=10287487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2918448A Expired GB645600A (en) | 1948-11-10 | 1948-11-10 | Improvements in or relating to the production of melamine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB645600A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2863869A (en) * | 1958-12-09 | Melamine purification process | ||
| US2999093A (en) * | 1961-09-05 | Preparation of melamese from | ||
| DE1236515B (en) * | 1964-09-08 | 1967-03-16 | American Cyanamid Co | Process for purifying melamine |
-
1948
- 1948-11-10 GB GB2918448A patent/GB645600A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2863869A (en) * | 1958-12-09 | Melamine purification process | ||
| US2999093A (en) * | 1961-09-05 | Preparation of melamese from | ||
| DE1236515B (en) * | 1964-09-08 | 1967-03-16 | American Cyanamid Co | Process for purifying melamine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES415330A1 (en) | Process for manufacture of calcium hydrochlorite | |
| GB645600A (en) | Improvements in or relating to the production of melamine | |
| GB964598A (en) | Production of soda ash | |
| GB451689A (en) | Improvements in or relating to the production of crystalline anhydrous sodium metasillicate | |
| SU144479A1 (en) | Method for producing diethylenetriaminepentaacetic acid | |
| US2132178A (en) | Manufacture of 4-aminobenzene-sulphonic acid amide | |
| US3350441A (en) | Process of preparing cleve's acid | |
| US1974506A (en) | 3.5 diacetoxy mercuri-4-nitroguaiacol | |
| GB581944A (en) | Production of lithium hypochlorite | |
| GB653993A (en) | Process of producing silicic acid from alkali silicates | |
| US1699888A (en) | Process for the manufacture of alkali-metal salts of halogenated amides of aromatic sulphonic acids | |
| US1517002A (en) | Pharmaceutical compound containing the sodium-silver compound of thiodiglycolic acid | |
| US1802036A (en) | Process of making an organic mercury compound | |
| US1494096A (en) | Process of separating naphthol-sulphonic acids | |
| US2161745A (en) | Tetrahydrofurfurylaminonaphthalene compounds and process for their preparation | |
| GB468157A (en) | Improvements in and relating to the preparation of complex iron compounds | |
| US1810009A (en) | 4'-sulpho-2-benzoyl-5-amino-benzoic acid | |
| GB633459A (en) | A process for the manufacture of n-(p-arsenosobenzyl)-glycine-amide and salts thereof | |
| GB622495A (en) | Improvements relating to the treatment of laundry and the like trade effluents | |
| US2230962A (en) | Production of aminothiazole | |
| US1500994A (en) | Effecting the separation of sodium carbonate from liquors or solutions containing caustic soda | |
| GB729625A (en) | Improvements in or relating to the preparation of non-odorous 2-methyl-4-chlorophenoxyacetic acid and its application as a selective weed-killer | |
| GB225199A (en) | A process for the production of chemically pure aluminium compounds | |
| GB285152A (en) | Process for preparing depilatory substances | |
| GB712207A (en) | New sulphonamide compounds and process of preparing the same |