GB890814A - Improvements in and relating to cyanuric acid - Google Patents
Improvements in and relating to cyanuric acidInfo
- Publication number
- GB890814A GB890814A GB18895/59A GB1889559A GB890814A GB 890814 A GB890814 A GB 890814A GB 18895/59 A GB18895/59 A GB 18895/59A GB 1889559 A GB1889559 A GB 1889559A GB 890814 A GB890814 A GB 890814A
- Authority
- GB
- United Kingdom
- Prior art keywords
- urea
- product
- blend
- aqueous
- cyanuric acid
- 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
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 title abstract 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract 14
- 239000004202 carbamide Substances 0.000 abstract 14
- 239000000047 product Substances 0.000 abstract 5
- 239000000203 mixture Substances 0.000 abstract 4
- 239000002253 acid Substances 0.000 abstract 2
- 239000007789 gas Substances 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 2
- 238000002156 mixing Methods 0.000 abstract 2
- 238000000197 pyrolysis Methods 0.000 abstract 2
- 238000011084 recovery Methods 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 1
- YSKUZVBSHIWEFK-UHFFFAOYSA-N ammelide Chemical compound NC1=NC(O)=NC(O)=N1 YSKUZVBSHIWEFK-UHFFFAOYSA-N 0.000 abstract 1
- MASBWURJQFFLOO-UHFFFAOYSA-N ammeline Chemical compound NC1=NC(N)=NC(O)=N1 MASBWURJQFFLOO-UHFFFAOYSA-N 0.000 abstract 1
- 238000009835 boiling Methods 0.000 abstract 1
- 238000009833 condensation Methods 0.000 abstract 1
- 230000005494 condensation Effects 0.000 abstract 1
- 239000012043 crude product Substances 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 238000005201 scrubbing Methods 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
In a process for the pyrolysis of urea at 230-375 DEG C. into crude cyanuric acid, the urea is fed to the heating zone as a free-flowing granular blend <PICT:0890814/III/1> of crude cyanuric acid and urea containing not more than 35 parts wt. urea from a mixing zone. The granular blend should be 1/16 -\ba1/2 inch particle size containing 5-35% urea. The blend may be prepared by spraying molten, or aqueous, urea on to the hot product of the process, and in the former case the heat of the product causes partial pyrolysis, while in the latter water evaporation. Blending is effected in a pug mill, or sigma, or ribbon, blender. Alternatively, crystalline urea is mixed with cold product. Heating may be 6-40 mins. in a fluidized bed, Herreschoff furnace, pug mill, or ribbon, or screw blender. Granular feed passes from hopper 18 through screw feed 16 to inclined rotary kiln 10 provided with scraper 24 at the feed end. Product passes over damn 28, and 11-20% is withdrawn as product through 32, while the remainder is collected in blender 34, where it is sprayed with aqueous urea from 36 through 40. The resulting blend is returned to hopper 18. The aqueous urea is increased in strength by urea condensed from the exhaust gases. The kiln exhaust gases pass from hood 29, through pipe 30, maintained at 220 DEG C. to prevent condensation, to urea recovery system 50. The urea recovery system may be a condenser with walls maintained at 115-130 DEG C. by a hot oil jacket from which liquid urea is returned to the system, or may be a Raschig ring packed scrubbing tower irrigated with aqueous urea and jacketed with hot water or steam. The crude product is treated with strong mineral acid, e.g. HCl or H2SO4, at the boiling point or under pressure to hydrolyse ammeline and ammelide to cyanuric acid and washed to yield pure acid. Specification 877,725 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US890814XA | 1958-06-10 | 1958-06-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB890814A true GB890814A (en) | 1962-03-07 |
Family
ID=22215579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18895/59A Expired GB890814A (en) | 1958-06-10 | 1959-06-03 | Improvements in and relating to cyanuric acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB890814A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923004A (en) * | 2019-11-12 | 2020-03-27 | 韩慧颖 | Catalytic method capable of improving reaction rate for slurry bed residual oil hydroconversion technology |
-
1959
- 1959-06-03 GB GB18895/59A patent/GB890814A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923004A (en) * | 2019-11-12 | 2020-03-27 | 韩慧颖 | Catalytic method capable of improving reaction rate for slurry bed residual oil hydroconversion technology |
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