DE897842C - Process for the production of calcium cyanamide containing nitrates - Google Patents

Process for the production of calcium cyanamide containing nitrates

Info

Publication number
DE897842C
DE897842C DEP53238A DEP0053238A DE897842C DE 897842 C DE897842 C DE 897842C DE P53238 A DEP53238 A DE P53238A DE P0053238 A DEP0053238 A DE P0053238A DE 897842 C DE897842 C DE 897842C
Authority
DE
Germany
Prior art keywords
calcium cyanamide
production
nitric acid
containing nitrates
nitrate
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
Application number
DEP53238A
Other languages
German (de)
Inventor
Ernst Dr Doehlemann
Franz Dr Kaess
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.)
SUEDDEUTSCHE KALKSTICKSTOFF-WERKE AG
Evonik Operations GmbH
Original Assignee
SUEDDEUTSCHE KALKSTICKSTOFF-WERKE AG
SKW Trostberg AG
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 SUEDDEUTSCHE KALKSTICKSTOFF-WERKE AG, SKW Trostberg AG filed Critical SUEDDEUTSCHE KALKSTICKSTOFF-WERKE AG
Priority to DEP53238A priority Critical patent/DE897842C/en
Application granted granted Critical
Publication of DE897842C publication Critical patent/DE897842C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C5/00—Fertilisers containing other nitrates
    • C05C5/04—Fertilisers containing other nitrates containing calcium nitrate

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Fertilizers (AREA)

Description

Verfahren zur Herstellung von nitrathaltigem Kalkstickstoff Es ist bereits bekannt, Kalkstickstoff zur Herbeiführung eines Nitratgehaltes mit ziemlich konzentrierter Salpetersäure zu besprühen.Process for the production of calcium cyanamide containing nitrate It is already known, calcium cyanamide to bring about a nitrate content with fairly spray concentrated nitric acid.

Der Erfindung liegt die Erkenntnis zugrunde, daß aus Kalkstickstoff sehr leicht Dicyandiami-d entsteht, dessen: Vorhandensein, im nitrathaltigen Kalkstickstoff nicht erwünscht ist.The invention is based on the knowledge that calcium cyanamide very easily Dicyandiami-d arises, its: presence, in the nitrate-containing calcium cyanamide is not wanted.

Es hat sich gezeigt, daß der Bildung von Dicyandiamiddann weitgehend vorgebeugt wird, wenn man; neben dem an sich bekannten Besprühen mit Salpetersäure dies darüber hinaus noch in mehreren Stufen vollzieht. Im vorliegenden Fall wird normale Betriebssäure als Salpetersäure verwendet, und zwar so viel, daß der Nitratstickstoffgehalt im Kalkstickstoff nicht über 2,5 % beträgt. Beispiel zoo Gewichtsteile Kalkstickstoff werden mit 23,7 Gewichtsteilen 5o0/aiger Salpetersäure in Form normaler Betriebssäure unter Vermischen besprüht. Die Temperatur erhöht sich auf q.2° C innerhalb einer Stunde. Das in. einem eisernen Mischer befindliche Material wird etwa 30 Minuten weitengemischt, dabei fällt die Temperatur auf 20° C. Es wird weiterhin Salpetersäure zugesetzt, bis die Temperatur sich wiederum auf etwa 4o° C erhitzt. Die Eindiisung der gesamten Säure dauert etwa 3 bis 4 Stunden.It has been shown that the formation of dicyandiamide largely is prevented when one; in addition to the known spraying with nitric acid this also takes place in several stages. In the present case, normal industrial acid used as nitric acid, so much that the nitrate nitrogen content in calcium cyanamide does not exceed 2.5%. Example zoo parts by weight of calcium cyanamide are with 23.7 parts by weight of 50% nitric acid in the form of normal operating acid sprayed with mixing. The temperature rises to q.2 ° C within one Hour. The material in an iron mixer is about 30 minutes mixed wide, the temperature drops to 20 ° C. It continues to be nitric acid added until the temperature heats up again to about 40 ° C. The indentation the total acid takes about 3 to 4 hours.

Der Dicyandiami.dgehalt steigt von. o,o6% auf 0,78% Dicyandi:amidstickstoff im Kalkstickstoff, .die Stickstoffverluste betragen o bis o,20/0. Das erhaltene Gemisch kann anschließend sofort verpreßt werden, es kann aber auch in der üblichen Weise durch Granulieren gekörnt werden.The Dicyandiami.d salary increases from. 0.06% to 0.78% dicyandi: amide nitrogen in calcium cyanamide, .the nitrogen losses are o to o, 20/0. The received Mixture can then be pressed immediately but it can can also be granulated in the usual way.

Analyse des Gemisches: 2o,8.711/9 Gesamtstickstoff, I,9.Io/o Nitratstickstoff, 0,48% Harnstoffstickstoff, 0,781/o Dieyandi.ami@dstickstoff.Analysis of the mixture: 2o, 8.711 / 9 total nitrogen, I, 9.Io / o nitrate nitrogen, 0.48% urea nitrogen, 0.781 / o Dieyandi.ami@dstickstoff.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von nitrathaltigem Kalkstickstoff durch Besprühen von. Kalkstickstoff mit in Form normaler Betriebssäure vorliegender Salpetersäure bis zu einem Nitratstickstoffgehalt nicht über 2,51/o, da-durch gekennzeichnet, daß rnan die Salpetersäure in mehreren Stufen zusetzt. Angezogene Druckschriften: Deutsche Patentschriften, Nr. 406 o52, 655 447. PATENT CLAIM: Process for the production of calcium cyanamide containing nitrate by spraying. Calcium cyanamide with nitric acid in the form of normal industrial acid up to a nitrate nitrogen content not exceeding 2.5%, characterized in that the nitric acid is added in several stages. Cited publications: German patents, No. 406 052, 655 447.
DEP53238A 1949-08-28 1949-08-28 Process for the production of calcium cyanamide containing nitrates Expired DE897842C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEP53238A DE897842C (en) 1949-08-28 1949-08-28 Process for the production of calcium cyanamide containing nitrates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP53238A DE897842C (en) 1949-08-28 1949-08-28 Process for the production of calcium cyanamide containing nitrates

Publications (1)

Publication Number Publication Date
DE897842C true DE897842C (en) 1953-11-26

Family

ID=7386288

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP53238A Expired DE897842C (en) 1949-08-28 1949-08-28 Process for the production of calcium cyanamide containing nitrates

Country Status (1)

Country Link
DE (1) DE897842C (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE406052C (en) * 1921-01-01 1924-11-15 Oskar Hoppe Rigid milling machine with a work table that is guided vertically on two sides
DE655447C (en) * 1931-04-24 1938-01-15 Albert R Frank Dr Production of grained calcium cyanamide or grained mixed fertilizer containing calcium cyanamide

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE406052C (en) * 1921-01-01 1924-11-15 Oskar Hoppe Rigid milling machine with a work table that is guided vertically on two sides
DE655447C (en) * 1931-04-24 1938-01-15 Albert R Frank Dr Production of grained calcium cyanamide or grained mixed fertilizer containing calcium cyanamide

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