DE294793C

DE294793C -

Info

Publication number: DE294793C
Application number: DENDAT294793D
Authority: DE

Description

ι B e i s ρ i e 1, 2. ·ι B e i s ρ i e 1, 2. ·

■ Man füllt in einen Druckapparat flüssiges Ammoniak, hierauf 10 bis 20 Prozent Wasser und preßt schließlich die erforderliche _; Menge Kohleridioxyd ein. Das Wasser kann auch gleichzeitig mit einem der beiden¹ Bestandteile zugeführt werden.■ One fills liquid ammonia into a pressure apparatus, then 10 to 20 percent water and finally presses the required amount _; Amount of carbon dioxide. The water can also be supplied simultaneously with one of the two components ^1.

Durch das vorliegende Verfahren gelingt es, im Gegensatz zu den bekannten, in kleinen Räumen eine rasche Bildung großer Mengen von' carbaminsäuren! Ammoniak ohne jeden Verlust an Ammoniak und Kohlensäure zuIn contrast to the known method, the present method succeeds in small steps Clear a rapid formation of large amounts of 'carbamic acids! Ammonia without anyone Loss of ammonia and carbonic acid too

erzielen. . , . . _: achieve. . ,. . _:

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;.. ^v. Patent-Anspruch: , ■■■.'·;.■ '..;■:■·'; .. ^v . Patent claim:, ■■■. '·;. ■'..; ■: ■ · '

ν Verfahren zur Darstellung von carbaminsaurem Ammoniak oder Gemischen '.;,";.' desselben mit Ammoniumcarbonateiii dadurch gekennzeichnet, daß man Ammoniak und Kohlensäure unter Druck zusammenbringt. ν Process for the preparation of carbamic acid ammonia or mixtures '.;, ";.' the same with ammonium carbonateiii thereby characterized in that ammonia and carbonic acid are brought together under pressure.

Claims

AUSGEGEBEN AM 18. NOVEMBER 1920ISSUED NOVEMBER 18, 1920

The use of urea as a fertilizer has recently been attracting increasing interest. The preparation of the same from ammonia is best done by heating the carbamic acid ammonia in a closed vessel. The attempts to represent the urea on a large scale hereafter have show that the ammonia previously used for the formation of the carbamic acids.

ίο Methods technically great difficulties offer or impracticable. .

It has now been shown that the representation of carbamic acids! Ammonia resp. \ on mixtures of the same with ammonium carbonates It is done quickly and excellently when one uses ammonia and carbonic acid brings together in suitable proportions under pressure. You can: the gases in at the same time or better one after the other insert the pressure-tight vessel. A temperature increase that is too great can be achieved through suitable cooling. Here ■ can also be achieved with large apparatuses that even with large inflow speed no dangerous prints . arise .. ■. '

If the carbamic acid ammonia is to be converted into urea, one can use the Then carry out the conversion in the same pressure vessel, with the educational

■ the heat of the ammonium carbamate can be used to convert it into urea. -. '.'"■. S _: ';■' ■

■ /. ' Example 1 ^.;

: In a sufficiently pressure-resistant autoclave, which is leaded or silvered on the inside and equipped with a device for cooling and heating as well as the necessary supply lines and the like. ''is provided, it is eingc- by means of a ¹ compressor gaseous ammonia _": pressing or liquid ammonia introduced ;, ■ thereto', is supplied with cooling liquid carbon dioxide in the formation of carbamate necessary amount After complete cooling, the contents of the pressure vessel. solidifies to form solid ammonium carbamate. If you want to convert the product directly to urea, so '■■ occurs no great increase in pressure, and heated after completion of contacting the gases at about 130 to 140 ^0th.,' the mixture is cooled only so far that