DE2411205B2 - PROCESS FOR OBTAINING A PRACTICALLY FREE OF AMMONIUM CARBONATE UREA SOLUTION FROM THE EMISSION OF A UREA SYNTHESIS DEVICE - Google Patents

PROCESS FOR OBTAINING A PRACTICALLY FREE OF AMMONIUM CARBONATE UREA SOLUTION FROM THE EMISSION OF A UREA SYNTHESIS DEVICE

Info

Publication number
DE2411205B2
DE2411205B2 DE19742411205 DE2411205A DE2411205B2 DE 2411205 B2 DE2411205 B2 DE 2411205B2 DE 19742411205 DE19742411205 DE 19742411205 DE 2411205 A DE2411205 A DE 2411205A DE 2411205 B2 DE2411205 B2 DE 2411205B2
Authority
DE
Germany
Prior art keywords
urea
liquid
obtaining
synthesis device
emission
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.)
Granted
Application number
DE19742411205
Other languages
German (de)
Other versions
DE2411205C3 (en
DE2411205A1 (en
Inventor
Umberto Dr. San Donato Milanese; Lagana Vincenzo Dr. Mailand; Zardi (Italien)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SnamProgetti SpA
Original Assignee
SnamProgetti SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SnamProgetti SpA filed Critical SnamProgetti SpA
Publication of DE2411205A1 publication Critical patent/DE2411205A1/en
Publication of DE2411205B2 publication Critical patent/DE2411205B2/en
Application granted granted Critical
Publication of DE2411205C3 publication Critical patent/DE2411205C3/en
Expired legal-status Critical Current

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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
    • C07C273/14—Separation; Purification; Stabilisation; Use of additives
    • C07C273/16—Separation; Purification
    • 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

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Description

Harnstoff 67,5%Urea 67.5%

Wasser 31,0%Water 31.0%

Harnstofflösungen enthalten Ammoniumcarbamat, *° Ϊ! ? ' VUrea solutions contain ammonium carbamate, * ° Ϊ! ? 'V

Wasser und Ammoniak. Zur Reinigung dieser Lö- Carbamat Water and ammonia. To purify this Lö- carbamate

sungen werden unter anderem die Destillation in
einer Kolonne oder in üblichen Wärmeaustauschern
oder Filmwärmeaustauschern angewandt, wobei es Das Flash-System arbeitete bei einer TemperaturSolutions include distillation in
a column or in conventional heat exchangers
or film heat exchangers, where the flash system operated at one temperature

auch möglich ist, Abstreifmittel zur Abtrennung der *5 von 200° C und einem Druck von 140 kg/cm2. bei der Zersetzung des Ammoniumcarbamats erzeugten Gase zu verwenden. Bei solchen Methoden ist dieIt is also possible to use stripping means for separating the * 5 from 200 ° C and a pressure of 140 kg / cm 2 . to use gases generated during the decomposition of ammonium carbamate. With such methods, the

restliche Carbamatmenge in der Harnstofflösung Beispiel 2remaining amount of carbamate in the urea solution Example 2

immer derart, daß weitere Reinigungsstufen erforderlich sind. 30always in such a way that further cleaning stages are required. 30th

Eü wurde nun gefunden, daß es zur Erzielung einer Zum Kopf einer Destillationskolonne (F i g. 2) mitIt has now been found that in order to achieve a top of a distillation column (FIG. 2) with

praktisch von Ammoniumcarbamat freien Harnstoff- 15 Böden und einer Verweilzeit der Flüssigkeit an lösung notwendig ist, auf die Gase, die sich aus der jedem Boden von 10 Sekunden wurde eine Harnstoff-Lösung entwickeln, durch eine Verminderung der lösung (1) der folgenden Zusammensetzung einge-Kontaktzeit zwischen diesen Gasen und der Flüssig- 35 speist:
keit einzuwirken, wobei als Endergebnis eine gasför- _ inno<Urea trays practically free of ammonium carbamate and a residence time of the liquid in solution is necessary, on the gases which develop from each tray of 10 seconds a urea solution was adjusted by reducing the solution (1) of the following composition -Contact time between these gases and the liquid- 35 feeds:
ability to act, the end result being a gas production _ inno <

mige Phase erhalten wird, die sich mit der flüssigen Harnstott *t,v '·mige phase is obtained, which is with the liquid urine stump * t, v '·

Phase nicht im Gleichgewicht befindet. Die Kontakt- wasser · l ''° '°Phase is not in equilibrium. The contact water · l '' ° '°

zeiten zwischen den sich bei dem Destillationsarbeits- Carbamat times between the distillation work carbamate

gang entwickelnden Gasen und der gleichzeitig anwe- 40 NH3 The gases evolving from the pathway and the NH 3

senden Flüssigkeit müssen unter 60 Sekunden, vorzugsweise unter 30 Sekunden, gehalten werden, um Der Fuß der Kolonne wurde mit Heizvorrichtungen zwischen der Flüssigkeit und den Gasen Bedingungen bzw. Heizmitteln auf eine Temperatur von 210 C gefür das NichtVorhandensein eines Gleichgewichts zu bracht,
erzielen. 45 Der Druck am Fuß bzw. am unteren Ende der Ko-Send liquid must be kept below 60 seconds, preferably below 30 seconds, in order to keep the base of the column at a temperature of 210 C with heating devices between the liquid and the gases conditions or heating means for the non-existence of an equilibrium,
achieve. 45 The pressure on the foot or at the lower end of the

Es ist ersichtlich, daß der Destillationsarbeitsgang lonne betrug 130 kg/cm2. Die Temperatur der die Komit jeder üblichen bekannten Vorrichtung durchge- lonne verlassenden Gase betrug 190° C. Als Kontaktführt werden kann, vorausgesetzt, daß die Kontakt- zeit zwischen Flüssigkeit und Gas resultierten 10 Sezeiten innerhalb der vorstehenden Grenzen gehalten künden,
werden. 5<> Die Zusammensetzung der die Kolonne verlassen-It can be seen that the distillation operation was 130 kg / cm 2 . The temperature of the gases leaving the committee of every conventional known device was 190 ° C. Contact can be made, provided that the contact time between liquid and gas resulted in 10 times being kept within the above limits,
will. 5 <> The composition of the column leaving-

Die folgenden Beispiele dienen zur Erläuterung der den Harnstofflösung (2) war: Erfindung.The following examples serve to explain what the urea solution (2) was: Invention.

Harnstoff 65,3 »/0Urea 65.3 »/ 0

Beispiel 1 Wasser 32,7%Example 1 water 32.7%

55 Carbamat vernach-55 Neglect carbamate

In ein Flash-System (Entspannungssystem), wie lässigbarIn a flash system (relaxation system), like permeable

dem in der F i g. 1 gezeigten, wurde eine Harnstoff- NH3 2%the one shown in FIG. 1, a urea NH 3 2%

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (2)

lösung (1) der folgenden Zusammensetzung einge-Patentansprüche: speist:Solution (1) of the following composition included patent claims: feeds: 1. Verfahren zur Gewinnung einer praktisch Harnstoff 33,3 °/o1. Method of obtaining a practically urea 33.3% von Ammoniumcarbamat freien Harnstofflösung 5 Wasser 18,1 %urea solution free of ammonium carbamate 5 water 18.1% aus dem Abstrom einer Harnstoff synthesevorrich- Ammoniumcarbamat 3^ofrom the effluent of a urea synthesis device ammonium carbamate 3 ^ o tung durch Destillation unter Abtrennung einer NH3 16,7 °/oprocessing by distillation with separation of an NH 3 16.7% flüssigen und gasförmigen Phase, dadurch g e -liquid and gaseous phase, thereby g e - kennzftichnet,daß man die Kontaktzeit zwi- Das Flash- (bzw. Entspannungs-) gefäß hatte dreiIndicates that the contact time between The flash (or relaxation) vessel had three sehen der flüssigen und der gasförmigen Phase, 10 Böden und ein »Thermosiphon-Zirkulationssystem«see the liquid and the gaseous phase, 10 floors and a »thermosiphon circulation system« die sich in ihrer Anwesenheit entwickelt, unter durch ein Wärmeelement 3. Die Geschwindigkeit derwhich develops in their presence, under through a warming element 3. The speed of the 60 Sekunden hält. Flüssigkeit in dem Thermosiphonumlauf betrugHolds for 60 seconds. Liquid in the thermosiphon circulation was 2. Verfahren gemäß Anspiuch 1, dadurch ge- 3 m/Sekunde, so daß die Kontaktzeit zwischen der kennzeichnet, daß man die Kontaktzeit unter Flüssigkeit und dem Gas 15 Sekunden betrug.2. The method according to claim 1, characterized by 3 m / second, so that the contact time between the indicates that the contact time under the liquid and the gas was 15 seconds. 30 Sekunden hält. 15 Die Zusammensetzung der Harnstofflösung (2), dieHolds for 30 seconds. 15 The composition of the urea solution (2), the das Entspannungsgefäß verließ, war:left the expansion vessel was:
DE19742411205 1973-03-08 1974-03-08 Process for obtaining a urea solution practically free of ammonium carbonate from the effluent of a urea synthesis device Expired DE2411205C3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT21300/73A IT981191B (en) 1973-03-08 1973-03-08 PROCEDURE FOR PURIFICATION FROM NH 3 AND CARBAMATE OF THE SOLUTION OUT OF A SINTE SI REACTOR OF THE URE
IT2130073 1973-03-08

Publications (3)

Publication Number Publication Date
DE2411205A1 DE2411205A1 (en) 1974-09-26
DE2411205B2 true DE2411205B2 (en) 1976-01-15
DE2411205C3 DE2411205C3 (en) 1976-09-09

Family

ID=

Also Published As

Publication number Publication date
GB1402249A (en) 1975-08-06
TR17998A (en) 1976-08-20
JPS56134344U (en) 1981-10-12
ZA741186B (en) 1975-01-29
LU69576A1 (en) 1974-07-05
PH12740A (en) 1979-08-09
ES424334A1 (en) 1976-06-01
AT342067B (en) 1978-03-10
FR2220516A1 (en) 1974-10-04
IE38973L (en) 1974-09-08
EG11031A (en) 1976-11-30
MW874A1 (en) 1975-05-13
NL7403054A (en) 1974-09-10
DK144008C (en) 1982-04-26
IT981191B (en) 1974-10-10
IN139208B (en) 1976-05-22
BR7401582D0 (en) 1974-11-05
FR2220516B1 (en) 1978-01-06
ZM4274A1 (en) 1974-11-21
AU6594074A (en) 1975-08-28
CA1022103A (en) 1977-12-06
JPS49124029A (en) 1974-11-27
CH603565A5 (en) 1978-08-31
DD112752A5 (en) 1975-05-05
AR200429A1 (en) 1974-11-08
DK144008B (en) 1981-11-16
BE811880A (en) 1974-07-01
ATA189874A (en) 1977-07-15
DE2411205A1 (en) 1974-09-26
RO69510A (en) 1980-12-30
SE386145B (en) 1976-08-02
IE38973B1 (en) 1978-07-05

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
E77 Valid patent as to the heymanns-index 1977
8339 Ceased/non-payment of the annual fee