{"id":1115,"date":"2025-01-17T09:53:13","date_gmt":"2025-01-17T09:53:13","guid":{"rendered":"https:\/\/www.espindesa.es\/tecnologias\/nitric-acid-mp-process\/"},"modified":"2025-04-30T13:58:49","modified_gmt":"2025-04-30T13:58:49","slug":"nitric-acid-mp-process","status":"publish","type":"page","link":"https:\/\/www.espindesa.es\/es\/tecnologias\/nitric-acid-mp-process\/","title":{"rendered":"Nitric Acid MP Process"},"content":{"rendered":"

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\n Volver<\/span>\n <\/i>\n <\/div>\n <\/a>\n
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  • P\u00e1gina<\/span><\/li><\/ul><\/div>\n

    \n WEAK HNO\u2083 NITRIC ACID MONOPRESSURE PROCESS\n <\/h1>\n <\/div>\n <\/div>\t\n <\/div>\n <\/section>[\/vc_column][\/vc_row][vc_row css=\u00bb.vc_custom_1737025291657{margin-top: 50px !important;}\u00bb][vc_column][vc_row_inner][vc_column_inner width=\u00bb1\/2″]
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    \n Overview\n <\/h3>\n

    \n FERTlLlZERAND AZEOTROPIC GRADES\n <\/h2>\n

    NlTRlC AClD is manufactured from Ammonia in the form of a solution of HNO in water. Concentrations of 55-60% HNO are used in the Fertilizer lndustry while azeotropic concentrations (68%HNO\u2083) are required by several procedures in the Chem\u00edcal Industry, mainly organic nitrations.<\/p>\n

    ESPINDESA leaded the European high pressure process in the 70’s and since then has continuously updated this technology to deal with the most severe environmental regulations and the high cost of energy. Plants for the Fertilizer Industry are still being designed by ESPINDESA with this technology.<\/p>\n

    In the last years the Industry demands giant plants and, in some cases, azeotropic concentration. However smaller units are still required being less efficient but with lower investment, these are the Nitric Acid Monopressure Plants.<\/p>\n\n <\/section>[vc_empty_space][\/vc_column_inner][vc_column_inner width=\u00bb1\/2″][vc_single_image image=\u00bb413″ img_size=\u00bbfull\u00bb css=\u00bb\u00bb][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row full_width=\u00bbstretch_row_content_no_spaces\u00bb][vc_column][vc_empty_space]

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    \n \"Comillas\"\n

    \n In the last years the Industry demands giant plants and, in some cases, azeotropic concentration.\n <\/p>\n <\/div>\n <\/section>[\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space]\n

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    \n Process Description\n <\/h4>\n <\/section>[vc_column_text css=\u00bb\u00bb]<\/p>\n

    Ammonia oxidation<\/strong><\/p>\n

    The<\/span> process<\/span> air<\/span> is<\/span> filtered<\/span> and<\/span> compressed<\/span> above<\/span> 10<\/span> bar.<\/span><\/p>\n

    The evaporated ammonia is reheated, filtered and mixed with process air<\/span> before<\/span> entering<\/span> the<\/span> ammonia<\/span> burner<\/span> where<\/span> Pt-Rh<\/span> catalyst and<\/span> getter <\/span>gauzes are placed. The temperature reaches 920\u00ba C.<\/p>\n

    The heat of the process gas is recovered ina<\/span> series of heat exchangers, where<\/span> the<\/span> temperature decreases from 920\u00baC to<\/span> 145\u00baC.<\/span> At<\/span> this point the <\/span>gases enter the cooler-condenser, which cools them below the dew point so that most of the water produced in the ammonia oxidation reaction condenses in the form ofa<\/span> nitric acid stream. This is separated from the gas and pumped to the appropriate tray of the absorber.<\/p>\n

    Absorption<\/b><\/span><\/p>\n

    By the time the gases reach the inlet of the absorption tower the <\/span>required oxidation of NO to NO 2<\/span> has already been completed. The internals<\/span> of<\/span> the<\/span> absorber<\/span> area<\/span> set<\/span> of<\/span> sieve<\/span> trays<\/span> with<\/span> integral<\/span> cooling<\/span> coils.<\/span><\/p>\n

    The number of trays depends on the tail gas NOx content permitted in the exhaust gas. The absorber could be designed for less than 200ppmv NOx. To reduce below 50 ppmv a catalyst for Denox abatement may be added.<\/span><\/p>\n

    The acid leaving the bottom of the absorption column is a<\/span> reddish colour owing to the presence of dissolved free NO2<\/span>. This is removed by countercurrent contact with the secondary air in<\/span> a small sieve tray column in the bottom of absorber. After bleaching, the acid is reduced on on NO2<\/span> content .<\/p>\n

    The tail gas leaves the absorption tower at 11 bar and 30\u00baC and is reheated to 420\u00baC. The gases are sent to the gas turbine, which recovers 70% of the power needed to drive the compressor set.<\/p>\n

    The<\/span> rest<\/span> of<\/span> the<\/span> power<\/span> is<\/span> provided<\/span> by<\/span> the<\/span> steam<\/span> turbine.<\/span><\/p>\n

    Operating consumptions<\/strong><\/p>\n

    The following table summarizes the main specific materials and utilities consumption per ton of HNO3<\/span> as azeotropic acid for a 1,000-t\/d plant.<\/p>\n

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    • Ammonia: 286 kg<\/li>\n
    • Steam(export): 350kg<\/li>\n
    • Catalyst, net (as Pt): 90 mg<\/li>\n
    • Electric power: 10 kWh<\/li>\n<\/ul>\n

       <\/p>\n

      The HP monopressure process despite its<\/span> lower efficiency<\/span> compared<\/span> to <\/span>dual process, has lower investment cost and compact design which could include a bull gear compressor, and it is quite common for capacities lower than 400 TPD.<\/p>\n

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      \n Process Flow Diagram\n <\/h4>\n <\/section>[vc_single_image image=\u00bb411″ img_size=\u00bbfull\u00bb css=\u00bb\u00bb][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

      [vc_row full_width=\u00bbstretch_row_content_no_spaces\u00bb][vc_column][\/vc_column][\/vc_row][vc_row css=\u00bb.vc_custom_1737025291657{margin-top: 50px !important;}\u00bb][vc_column][vc_row_inner][vc_column_inner width=\u00bb1\/2″][vc_empty_space][\/vc_column_inner][vc_column_inner width=\u00bb1\/2″][vc_single_image image=\u00bb413″ img_size=\u00bbfull\u00bb css=\u00bb\u00bb][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row full_width=\u00bbstretch_row_content_no_spaces\u00bb][vc_column][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space][vc_column_text css=\u00bb\u00bb] Ammonia oxidation The process air is filtered and compressed above 10 bar. The evaporated ammonia is reheated, filtered and mixed with process air before entering the ammonia burner where Pt-Rh catalyst and getter gauzes are placed. The temperature reaches 920\u00ba C. The heat […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1011,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-1115","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.espindesa.es\/es\/wp-json\/wp\/v2\/pages\/1115","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.espindesa.es\/es\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.espindesa.es\/es\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.espindesa.es\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.espindesa.es\/es\/wp-json\/wp\/v2\/comments?post=1115"}],"version-history":[{"count":3,"href":"https:\/\/www.espindesa.es\/es\/wp-json\/wp\/v2\/pages\/1115\/revisions"}],"predecessor-version":[{"id":1223,"href":"https:\/\/www.espindesa.es\/es\/wp-json\/wp\/v2\/pages\/1115\/revisions\/1223"}],"up":[{"embeddable":true,"href":"https:\/\/www.espindesa.es\/es\/wp-json\/wp\/v2\/pages\/1011"}],"wp:attachment":[{"href":"https:\/\/www.espindesa.es\/es\/wp-json\/wp\/v2\/media?parent=1115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}