FR2159050A5 - Urea particles prodn - in a fluidized bed utilizing heat of crystallization to evaporate water - Google Patents
Urea particles prodn - in a fluidized bed utilizing heat of crystallization to evaporate waterInfo
- Publication number
- FR2159050A5 FR2159050A5 FR7238328A FR7238328A FR2159050A5 FR 2159050 A5 FR2159050 A5 FR 2159050A5 FR 7238328 A FR7238328 A FR 7238328A FR 7238328 A FR7238328 A FR 7238328A FR 2159050 A5 FR2159050 A5 FR 2159050A5
- Authority
- FR
- France
- Prior art keywords
- urea
- bed
- soln
- nuclei
- crystallization
- 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
-
- 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
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Fertilizers (AREA)
- Glanulating (AREA)
Abstract
Urea particles are produced by continuously dispersing a finely divided concentrated urea soln in a fluidized bed of urea nuclei substantially having a size of is not 150 micron and immediately introducing into the bed a stream of medium, the gas introduced into the bed, the temp of the urea soln and amount of urea soln are so chosen that the temp of the bed remains 132 degrees C (advantageously 60-100 degrees C) and the amount of water introduced with the urea soln. evaporates (with removal of a gas having a relative humidity of 20%) to form urea particles which are continuously separated off, and the quantity of urea nuclei in the bed is held constant by the introduction of fresh urea nuclei. An apparatus for carrying out the above process, in which the urea nuclei are produced by comminution of recycled urea particles, is claimed. The new process utilizes the heat of crystallization of the urea to evaporate the water from the urea soln. High temps. are avoided, thus minimizing the formation of biuret.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7114771A NL7114771A (en) | 1971-10-27 | 1971-10-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2159050A5 true FR2159050A5 (en) | 1973-06-15 |
Family
ID=19814340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7238328A Expired FR2159050A5 (en) | 1971-10-27 | 1972-10-27 | Urea particles prodn - in a fluidized bed utilizing heat of crystallization to evaporate water |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS4852551A (en) |
DE (1) | DE2252112A1 (en) |
FR (1) | FR2159050A5 (en) |
IT (1) | IT972104B (en) |
NL (1) | NL7114771A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2393779A1 (en) * | 1977-06-09 | 1979-01-05 | Azote Sa Cie Neerlandaise | Urea granules prodn. - by spraying fluidised urea particles with conc. urea soln. |
FR2481948A1 (en) * | 1980-05-12 | 1981-11-13 | Azote Sa Cie Neerlandaise | METHOD FOR MANUFACTURING PELLETS OBTAINED FROM A CORE THAT IS SURROUNDED BY AN ENVELOPE |
-
1971
- 1971-10-27 NL NL7114771A patent/NL7114771A/xx not_active Application Discontinuation
-
1972
- 1972-10-24 DE DE19722252112 patent/DE2252112A1/en active Pending
- 1972-10-25 JP JP10757272A patent/JPS4852551A/ja active Pending
- 1972-10-26 IT IT972572A patent/IT972104B/en active
- 1972-10-27 FR FR7238328A patent/FR2159050A5/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2393779A1 (en) * | 1977-06-09 | 1979-01-05 | Azote Sa Cie Neerlandaise | Urea granules prodn. - by spraying fluidised urea particles with conc. urea soln. |
FR2481948A1 (en) * | 1980-05-12 | 1981-11-13 | Azote Sa Cie Neerlandaise | METHOD FOR MANUFACTURING PELLETS OBTAINED FROM A CORE THAT IS SURROUNDED BY AN ENVELOPE |
Also Published As
Publication number | Publication date |
---|---|
IT972104B (en) | 1974-05-20 |
JPS4852551A (en) | 1973-07-24 |
NL7114771A (en) | 1973-05-02 |
DE2252112A1 (en) | 1973-05-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |