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The manufacture of monosodium phosphate from wet process acid by amine extraction
Monosodium phosphate (NaH₂PO₄) may be prepared from a mixture of phosphoric acid and sodium chloride on the principle that an amine in organic solution can extract the elements of hydrochloric acid (HCl). This is possible because amines are more selective for hydrochloric than for phosphoric acid. I...
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| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2016
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| _version_ | 1867613147912732672 |
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| access_status_str | Open Access |
| author | Price, Roger Nelson Davey |
| author2 | De Kock, J W |
| author_browse | De Kock, J W Price, Roger Nelson Davey |
| author_facet | De Kock, J W Price, Roger Nelson Davey |
| author_sort | Price, Roger Nelson Davey |
| collection | Thesis |
| description | Monosodium phosphate (NaH₂PO₄) may be prepared from a mixture of phosphoric acid and sodium chloride on the principle that an amine in organic solution can extract the elements of hydrochloric acid (HCl). This is possible because amines are more selective for hydrochloric than for phosphoric acid. If wet process phosphoric acid is used, the impurities must be separated in some way from the final product. The work described here involves a study of the distribution of phosphoric acid itself, and the impurities trivalent iron and sulphate, between aqueous solutions and kerosene solut ions of the commercial amine Amberlite LA-1. In a countercurrent extraction process, approximately twenty theoretical stages would be needed to reduce the iron concentration to the food grade level. Sulphate is held in the organic phase. Monosodium phosphate can be recovered by stripping the organic phase with a sodium chloride solution. An attempt was made to explain the extraction of phosphoric and sulphuric acids from a mixture. It was found that amine extraction followed a pattern similar to that of gas adsorption, and a modified BET equation gave a fair but not highly accurate fit of the distribution data. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22558 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:31.816Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Chemical Engineering |
| publisherStr | Department of Chemical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/22558 The manufacture of monosodium phosphate from wet process acid by amine extraction Price, Roger Nelson Davey De Kock, J W Paddon, Brian D A Chemical Engineering Monosodium phosphate (NaH₂PO₄) may be prepared from a mixture of phosphoric acid and sodium chloride on the principle that an amine in organic solution can extract the elements of hydrochloric acid (HCl). This is possible because amines are more selective for hydrochloric than for phosphoric acid. If wet process phosphoric acid is used, the impurities must be separated in some way from the final product. The work described here involves a study of the distribution of phosphoric acid itself, and the impurities trivalent iron and sulphate, between aqueous solutions and kerosene solut ions of the commercial amine Amberlite LA-1. In a countercurrent extraction process, approximately twenty theoretical stages would be needed to reduce the iron concentration to the food grade level. Sulphate is held in the organic phase. Monosodium phosphate can be recovered by stripping the organic phase with a sodium chloride solution. An attempt was made to explain the extraction of phosphoric and sulphuric acids from a mixture. It was found that amine extraction followed a pattern similar to that of gas adsorption, and a modified BET equation gave a fair but not highly accurate fit of the distribution data. 2016-11-16T13:23:57Z 2016-11-16T13:23:57Z 1974 Master Thesis Masters MSc http://hdl.handle.net/11427/22558 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Price, Roger Nelson Davey The manufacture of monosodium phosphate from wet process acid by amine extraction |
| thesis_degree_str | Master's |
| title | The manufacture of monosodium phosphate from wet process acid by amine extraction |
| title_full | The manufacture of monosodium phosphate from wet process acid by amine extraction |
| title_fullStr | The manufacture of monosodium phosphate from wet process acid by amine extraction |
| title_full_unstemmed | The manufacture of monosodium phosphate from wet process acid by amine extraction |
| title_short | The manufacture of monosodium phosphate from wet process acid by amine extraction |
| title_sort | manufacture of monosodium phosphate from wet process acid by amine extraction |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/22558 |
| work_keys_str_mv | AT pricerogernelsondavey themanufactureofmonosodiumphosphatefromwetprocessacidbyamineextraction AT pricerogernelsondavey manufactureofmonosodiumphosphatefromwetprocessacidbyamineextraction |