{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T13:06:27Z","timestamp":1789477587952,"version":"build-2803163510"},"reference-count":28,"publisher":"American Chemical Society (ACS)","issue":"26","license":[{"start":{"date-parts":[[2019,12,13]],"date-time":"2019-12-13T00:00:00Z","timestamp":1576195200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/pubs.acs.org\/page\/policy\/authorchoice_termsofuse.html"}],"funder":[{"DOI":"10.13039\/501100003593","name":"Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100003593","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004809","name":"Financiadora de Estudos e Projetos","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004225","name":"Petrobras","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004225","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2019,12,24]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>A highly exothermic nitrogen generation system (NGS) can be achieved by mixing solutions of sodium nitrite and ammonium chloride, a process used by the oil and gas industry to dissolve paraffin wax and gas hydrates. Although its main products are nitrogen gas and a sodium chloride brine, the NGS has a side reaction that produces nitrogen oxides. To optimize this process to ensure the greatest and fastest heat generation with the lowest oxide production, this reaction was checked by infrared spectroscopy and calorimetry. The factors temperature, pH, and initial concentration of nitrite and ammonium were evaluated, and the optimal conditions of the NGS were determined by the constructed models to predict heat and NOx generation. These conditions were a ratio of ammonium\/nitrite equal to 1 and a catalyst concentration of 0.07 mol\u00b7L\u20131 (for a case in which the temperature is 5 \u00b0C).<\/jats:p>","DOI":"10.1021\/acsomega.9b03044","type":"journal-article","created":{"date-parts":[[2019,12,13]],"date-time":"2019-12-13T14:34:56Z","timestamp":1576247696000},"page":"21985-21992","source":"Crossref","is-referenced-by-count":3,"title":["Controlling Nitrogen\nOxide (NO\n                    <i>x<\/i>\n                    ) Emissions from Exothermic\nNitrogen Generation Systems for\nApplication in Subsea Environments"],"prefix":"10.1021","volume":"4","author":[{"given":"Felipe J. S.","family":"Bispo","sequence":"first","affiliation":[{"name":"Federal University of Rio de Janeiro , , ,","place":["Rio de Janeiro, Brazil, 21494-900"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vinicius","family":"Kartnaller","sequence":"additional","affiliation":[{"name":"Federal University of Rio de Janeiro , , ,","place":["Rio de Janeiro, Brazil, 21494-900"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7552-7614","authenticated-orcid":true,"given":"Joa\u0303o","family":"Cajaiba","sequence":"additional","affiliation":[{"name":"Federal University of Rio de Janeiro , , ,","place":["Rio de Janeiro, Brazil, 21494-900"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2019,12,13]]},"reference":[{"key":"2026091508273954000_cit1","doi-asserted-by":"publisher","first-page":"157","DOI":"10.2118\/15660-PA","article-title":"In-Situ Heat System\nStimulates Paraffinic-Crude Producers in Gulf of Mexico","volume":"4","author":"Ashton","year":"1989","journal-title":"SPE Prod. 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N.\n          \n          Process for\nthe thermo-chemical dewaxing of hydrocarbon transmission conduits. U.S. Patent 5,639,313 A, Dec 15, 1993."},{"key":"2026091508273954000_cit6","doi-asserted-by":"crossref","unstructured":"Rocha, N. O.; Khalil, C. N.; Leite, L. C. F.; Bastos, R. M.\n          A Thermochemical\nProcess for Wax Damage Removal.  International\nSymposium on Oilfield Chemistry, 2003.","DOI":"10.2523\/80266-MS"},{"key":"2026091508273954000_cit7","doi-asserted-by":"crossref","unstructured":"Marques, L. C. C.; Pedroso, C. A.; Paixa\u0303o, L. C. A.\n          New Flow\nAssurance Solutions to Work Out Hydrate and Paraffin Blockage Problems\nin Deep Waters.  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Res."},{"key":"2026091508273954000_cit11","doi-asserted-by":"crossref","unstructured":"Romeu, R. K.; Khalil, C. N.; Franco, Z. A.\n          Paraffin Precipitation\nin the Formation in Dam Joao Reid, Brazil.  SPE Latin America Petroleum Engineering Conference, 1990.","DOI":"10.2118\/21108-MS"},{"key":"2026091508273954000_cit12","doi-asserted-by":"crossref","unstructured":"Evangelista, E.; Chagas, C. M.; Melo, K. A. F.; Filho, N. B.; Rocha, J. D. H.; Marques, L. C. d. C.\n          Removal of a Hydrate Plug from a Subsea Xmas-Tree Located in Ultradeepwaters\nwith the Aid of a Heat-Releasing Treating Fluid.  Offshore Technology Conference, 2009.","DOI":"10.4043\/19730-MS"},{"key":"2026091508273954000_cit13","doi-asserted-by":"crossref","unstructured":"Marques, L. C. C.; Pedroso, C. A.; Paixa\u0303o, L. C. A.\n          New Flow\nAssurance Solutions to Work Out Hydrate and Paraffin Blockage Problems\nin Deep Waters.  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