PL112252B2 - Method of cleaning of gas for ammonia synthesis - Google Patents

Method of cleaning of gas for ammonia synthesis Download PDF

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Publication number
PL112252B2
PL112252B2 PL21151978A PL21151978A PL112252B2 PL 112252 B2 PL112252 B2 PL 112252B2 PL 21151978 A PL21151978 A PL 21151978A PL 21151978 A PL21151978 A PL 21151978A PL 112252 B2 PL112252 B2 PL 112252B2
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PL
Poland
Prior art keywords
gas
ammonia
synthesis
fresh
ammonia synthesis
Prior art date
Application number
PL21151978A
Other languages
Polish (pl)
Other versions
PL211519A2 (en
Inventor
Jozef Hajduk
Maciej Sarnowski
Mieczyslaw Mrowiec
Original Assignee
Politechnika Krakowska
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.)
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Publication date
Application filed by Politechnika Krakowska filed Critical Politechnika Krakowska
Priority to PL21151978A priority Critical patent/PL112252B2/en
Publication of PL211519A2 publication Critical patent/PL211519A2/xx
Publication of PL112252B2 publication Critical patent/PL112252B2/en

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  • Industrial Gases (AREA)

Description

Przedmiotem wynalazku jest sposób oczyszczania gazu do syntezy amoniaku.Znane i stosowane spdsoby oczyszczania gazu do syn¬ tezy amoniaku polegaja na tym, ze swiezy gaz syntezowy o cisnieniu okolo 300 atn laczy sie z gazami obiegowymi przed kondensatorami amoniakalnymi, a nastepnie mie¬ szanina ochladza sie w tych kondensatorach do tempera¬ tury 0 do ± 10°C.W tych warunkach nastepuje wykroplenie amoniaku i równoczesnie rozpuszczenie w nim CO2w postaci wegla¬ nów amonowych, wody oraz oleju, wniesionych z gazem swiezym.Rozdzielenie wykroplonego amoniaku do gazu naste¬ puje w wymienniku zimna, skad gaz kieruje sie do kon¬ wertora. Gaz wylotowy z konwertora chlodzi sie w chlodnicy do temperatury 35-45°C. Wykroplony amo¬ niak oddziela sie od gazu w seperatorze, a nastepnie gazy w seperatorze dopreza sie w pompie cyrkulacyjnej do okolo 300 atn i poprzezfiltry, wymiennik zimna laczy sie z gazami swiezymi.Stosowane dotychczas metody oczyszczania gazu do produkcji amoniaku wykazuja szereg wad, miedzy innymi sa energochlonne z uwagi na obróbke cieplna i transport mieszaniny gazowej o duzej objetosci.Mieszaninie gazu swiezego z obiegowym przed kon¬ densatorami amoniakalnymi jest powodem niekorzyst¬ nego rozcienczania amoniaku z okolo 10% do 4,7-8,5% powodujacego zmniejszenie produkcji amoniaku o okolo Znane i stosowane metody oczyszczania gazu wyma¬ gaja duzych ilosci czynników chlodzacych, powoduja równiez zanieczyszczenie produkowanego amoniaku o okolo 50% weglanami, olejem i woda. Prowadzenie pro¬ cesu wedlug dotychczasowego sposobu jest przyczyna zanieczyszczen powierzchni urzadzen do wymiany ciepla.Celem wynalazkujest usuniecie powyzszych niedogod¬ nosci przez calkowite wyeliminowanie niekorzystnego mieszania gazu swiezego i obiegowego przed kondensa¬ torami amoniakalnymi.Wedlug wynalazku sposób oczyszczania gazu do syn¬ tezy amoniaku polega na tym, ze swiezy gaz syntezowy o cisnieniu okolo 300 atn chlodzi sie do temperatury 0-10°C i przemywa siecieklym amoniakiem, a nastepnie wprowadza sie do konwertora syntezy amoniaku, gdzie doprowadza sie równoczesnie gaz obiegowy. Gaz obie¬ gowy poddaje sie obróbce w znany sposób.Zaleta sposobu wedlug wynalazkujest unikniecie ene¬ rgochlonnego oziebiania objetosci mieszaniny gazowej, zmniejszenie wysycenia gazu swiezego amoniakiem z 4,5 do 1,5%, a takze zwiekszenie zywotnosci katalizatora syntezy amoniaku.Przez wyeliminowanie wytracania z gazu swiezego osa¬ dów zanieczyszczajacych powierzchnie urzadzen do wymiany ciepla i masy oraz rurociagów i armatury zmniejsza sie-postoje instalacji zwiazane z oczyszczaniem tych urzadzen% Amoniak produkowany w oparciu o gaz oczyszczonyI 112 252 sposobem wedwg wynalazku moze byc wykorzystany takie w innych technologiach, na przyklad w produkcji wody amoniakalnej o wysokiej czystosci.Sposób oczyszczania gazu uwidoczniony jest na rysunku przedstawiajacym schemat ideowy jednostki amoniaku.Strumien gazu swiezego syntezowego o cisnieniu 300 atn chlodzi sie do temperatury 5FC w chlodnio przeponowej 8 zimnymi gazami po absorberze 9 i ochlo¬ dzony gaz przemywa siecieklymamoniakiem wabsorbe- rze 9. Gazswiezy,prawie ca&owideoczyszczonyz wody, COi i oleju wprowadza sie do konwertora 3 syntezy amoniaku. Do konwertora 3 doprowadza sie gaz obie¬ gowy. Z konwertora 3 gaz chlodzi sie w chlodnicy 4 do temperatury 40°C. Wykroplony amoniak oddzielasieod gazu w seperatorze 5. Gaz z seperatora 5dopreza sie w pompk cyrkulacymej 6 do cisnienia 300 atn i poprzez filtry — odolejacze 7, wymiennik zimna 2kieruje siedo kondensatofowanioniakamychl, natomiastcieklyamo¬ niak z winiennika zimna2 oiazzseperatoia5kieiujesie do odbiorców.Zastrzezenie patentowe Sposób oczyszczania gazu do syntezy amoniaku, zaKcany tym, ze swiezy gaz syntezowy o cisnieniu okolo 300 atn chtodzi sie ó^ temperatury 0-10°C i prze¬ mywa sie cieklym amoniakiem, a nastepnie wprowadza siedo konwertorasyntezyamoniaku,gdzierównoczesnie doprowadza sie gaz obiegowy, przy czym gaz obiegowy poddaje sie obróbce w znany sposób.Prac. Poligraf. UP PRL. Naklad 120 egz.Cena 45 zl PLThe subject of the invention is a gas purification process for ammonia synthesis. The known and used gas purification processes for ammonia synthesis consist in the fact that fresh synthesis gas with a pressure of about 300 atm is combined with the circulating gases before the ammonia condensers, and then the mixture is cooled down. in these condensers at a temperature of 0 to ± 10 ° C. under these conditions, ammonia condensation takes place and, at the same time, CO2 is dissolved in it in the form of ammonium carbonates, water and oil, brought in with the fresh gas. Separation of the condensed ammonia into the gas takes place in a cold exchanger. where the gas is directed to the converter. The outlet gas from the converter is cooled down in a chiller to a temperature of 35-45 ° C. The condensed ammonia is separated from the gas in the separator, and then the gases in the separator are compressed in the circulation pump to about 300 atm and through the filters, the cold exchanger is combined with fresh gases. The gas purification methods used so far to produce ammonia show a number of disadvantages, among others are energy-intensive due to the heat treatment and transport of a large volume gas mixture. The mixture of fresh and circulating gas before ammonia condensers causes the unfavorable dilution of ammonia from about 10% to 4.7-8.5%, reducing the production of ammonia by around The known and used methods of gas purification require large amounts of cooling agents, and also contaminate the produced ammonia by about 50% with carbonates, oil and water. Carrying out the process according to the prior method causes contamination of the surface of the heat exchange devices. The aim of the present invention is to eliminate the above drawbacks by completely eliminating the unfavorable mixing of fresh and circulating gas before ammonia condensers. According to the invention, the method of purifying the gas to the synthesis of ammonia is that the fresh synthesis gas with a pressure of about 300 atm is cooled to 0-10 ° C and washed with heavy ammonia, and then fed to the ammonia synthesis converter, where the recycle gas is fed simultaneously. The circulating gas is treated in a known manner. The advantage of the process according to the invention is that it avoids the energy-intensive cooling of the volume of the gas mixture, reduces the saturation of the fresh gas with ammonia from 4.5 to 1.5%, and also increases the service life of the ammonia synthesis catalyst. fresh gas and sediments contaminating the surfaces of heat and mass exchange devices as well as pipelines and fittings are reduced - installation downtime associated with cleaning these devices% Ammonia produced on the basis of purified gas and 112 252 according to the invention can be used in other technologies, example in the production of high purity ammonia water. The method of purifying the gas is shown in the diagram showing the schematic diagram of the ammonia unit. The stream of fresh synthesis gas with a pressure of 300 atm is cooled to a temperature of 5F in a cold membrane 8 with cold gases after the absorber 9 and the cooled gas is washed lure with ammonia sorber 9. Fresh gas, almost completely purified from water, COi and oil, is fed to converter 3 for ammonia synthesis. Circulating gas is fed to converter 3. From the converter 3, the gas is cooled in the cooler 4 to a temperature of 40 ° C. The condensed ammonia is separated from the gas in the separator 5. The gas from the separator 5 is supplied by a circulating pump 6 to a pressure of 300 atm and through filters - oil separators 7, the cold exchanger 2 directs the condensate drainage site, while the liquid effluent from the cold vineyard is separated2. of ammonia synthesis, curtailed by the fact that fresh synthesis gas with a pressure of about 300 atm is cooled at a temperature of 0-10 ° C and washed with liquid ammonia, and then introduced seven ammonia synthesis converters, where the circulating gas is simultaneously fed, and the circulating gas is subjected to processed in a known manner. Typographer. UP PRL. Mintage 120 copies Price PLN 45 PL

Claims (1)

1. Zastrzezenie patentowe Sposób oczyszczania gazu do syntezy amoniaku, zaKcany tym, ze swiezy gaz syntezowy o cisnieniu okolo 300 atn chtodzi sie ó^ temperatury 0-10°C i prze¬ mywa sie cieklym amoniakiem, a nastepnie wprowadza siedo konwertorasyntezyamoniaku,gdzierównoczesnie doprowadza sie gaz obiegowy, przy czym gaz obiegowy poddaje sie obróbce w znany sposób. Prac. Poligraf. UP PRL. Naklad 120 egz. Cena 45 zl PL1. Patent claim A gas purification process for the synthesis of ammonia, based on the fact that fresh synthesis gas with a pressure of about 300 atm is cooled to 0-10 ° C and washed with liquid ammonia, and then seven ammonia converters are introduced and fed simultaneously recycle gas, the recycle gas being treated in a known manner. Wash. Typographer. UP PRL. Mintage 120 copies Price PLN 45 PL
PL21151978A 1978-12-07 1978-12-07 Method of cleaning of gas for ammonia synthesis PL112252B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL21151978A PL112252B2 (en) 1978-12-07 1978-12-07 Method of cleaning of gas for ammonia synthesis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL21151978A PL112252B2 (en) 1978-12-07 1978-12-07 Method of cleaning of gas for ammonia synthesis

Publications (2)

Publication Number Publication Date
PL211519A2 PL211519A2 (en) 1979-11-05
PL112252B2 true PL112252B2 (en) 1980-10-31

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PL211519A2 (en) 1979-11-05

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