BE483014A - - Google Patents
Info
- Publication number
- BE483014A BE483014A BE483014DA BE483014A BE 483014 A BE483014 A BE 483014A BE 483014D A BE483014D A BE 483014DA BE 483014 A BE483014 A BE 483014A
- Authority
- BE
- Belgium
- Prior art keywords
- emi
- carbon dioxide
- production
- sodium bicarbonate
- urea
- Prior art date
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
-
- 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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
" Procédé pour la production d'urée "
<EMI ID=1.1>
partant de l'ammoniaque et de l'anhydride carbonique, qui
réagissent d'abord avec formation de carbamate d'ammonium :
<EMI ID=2.1>
n'est toutefois pas complète, d'où la nécessité de refouler
dans le cycle le mélange gazeux qui n'a pas réagi, opération
qui présente maintes difficultés au point de vue technologique.
En outre, pour cette synthèse il faut employer de
l'anhydride carbonique très pur, ce qui accroît sensiblement le coût de fabrication de l'urée.
On peut cependant éviter ces inconvénients par le procédé de
<EMI ID=3.1>
sente invention, caractérisé par deux phases distinctes et subséquentes, dans la première desquelles l'anhydride carbonique brut, obtenu par lavage d'un gaz qui le contient, éventuellement après conversion de celui-ci, est employé de façon connue pour la production de bicarbonate de sodium, tandis que dans la deuxième phase, l'anhydride carbonique pur et concentré, obtenu par calcination du bicarbonate de sodium, est mis en réaction de manière connue avec l'ammoniaque.
Une autre caractéristique de l'invention consiste en ce que, après la séparation de l'urée, le mélange gazeux qui n'a pas réagi est refoulé dans le cycle est utilisé dans la première phase du procédé, pour la production de bicarbonate de sodium.
La production de l'urée selon la présente invention a donc lieu d'après le cycle suivant, qui sera décrit schématiquement et à titre d'exemple:
On gazéifie un combustible convenable, en convertissant le
<EMI ID=4.1>
fournit ainsi un mélange gazeux approprié à la synthèse de l'ammoniaque, indispensable à la production soit de l'urée, soit du bicarbonate de sodium.
<EMI ID=5.1>
<EMI ID=6.1>
produit le bicarbonate d'ammonium qui, à son tour, produit le bicarbonate de sodium par réaction avec du chlorure de sodium. Ce
<EMI ID=7.1>
qui est employé pour la synthèse de l'urée, tandis que la partie
<EMI ID=8.1>
nouveau pour la production du bicarbonate de sodium.
Les avantages du procédé selon la présente invention sont
<EMI ID=9.1>
"Process for the production of urea"
<EMI ID = 1.1>
starting from ammonia and carbon dioxide, which
first react with the formation of ammonium carbamate:
<EMI ID = 2.1>
is not complete, however, hence the need to repress
in the cycle the gas mixture which has not reacted, operation
which presents many difficulties from a technological point of view.
In addition, for this synthesis it is necessary to use
very pure carbon dioxide, which significantly increases the cost of manufacturing urea.
However, these drawbacks can be avoided by the process of
<EMI ID = 3.1>
This invention, characterized by two distinct and subsequent phases, in the first of which the crude carbon dioxide, obtained by washing a gas which contains it, optionally after conversion of the latter, is used in a known manner for the production of bicarbonate of sodium, while in the second phase, pure and concentrated carbon dioxide, obtained by calcining sodium bicarbonate, is reacted in known manner with ammonia.
Another feature of the invention is that, after the separation of the urea, the unreacted gas mixture is forced back into the cycle and is used in the first phase of the process, for the production of sodium bicarbonate. .
The production of urea according to the present invention therefore takes place according to the following cycle, which will be described schematically and by way of example:
A suitable fuel is gasified by converting the
<EMI ID = 4.1>
thus provides a gas mixture suitable for the synthesis of ammonia, essential for the production of either urea or sodium bicarbonate.
<EMI ID = 5.1>
<EMI ID = 6.1>
produces ammonium bicarbonate which, in turn, produces sodium bicarbonate by reaction with sodium chloride. This
<EMI ID = 7.1>
which is used for the synthesis of urea, while the part
<EMI ID = 8.1>
new for the production of sodium bicarbonate.
The advantages of the method according to the present invention are
<EMI ID = 9.1>
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT967433X | 1947-09-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE483014A true BE483014A (en) |
Family
ID=11332661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE483014D BE483014A (en) | 1947-09-16 |
Country Status (2)
Country | Link |
---|---|
BE (1) | BE483014A (en) |
FR (1) | FR967433A (en) |
-
0
- BE BE483014D patent/BE483014A/fr unknown
-
1948
- 1948-06-08 FR FR967433D patent/FR967433A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR967433A (en) | 1950-11-03 |
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