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Production of mid-chain branched detergent-range olefins over shape-selective acid catalysts
Includes bibliographical references (leaves 78-83).
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2015
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| _version_ | 1867614081761935360 |
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| access_status_str | Open Access |
| author | Sumani, Mmontshi Lebohang Oliver |
| author2 | Fletcher, Jack |
| author_browse | Fletcher, Jack Sumani, Mmontshi Lebohang Oliver |
| author_facet | Fletcher, Jack Sumani, Mmontshi Lebohang Oliver |
| author_sort | Sumani, Mmontshi Lebohang Oliver |
| collection | Thesis |
| description | Includes bibliographical references (leaves 78-83). |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/10977 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:46:22.735Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| 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:11427/10977 Production of mid-chain branched detergent-range olefins over shape-selective acid catalysts Sumani, Mmontshi Lebohang Oliver Fletcher, Jack Applied Science Includes bibliographical references (leaves 78-83). For the purpose of producing mid-chain mono-methyl branched olefins, a range of acid catalysts (MFI, BEA, TON and amorphous silica-alumina) were screened for the dimerization of 1-hexene, under generally mild conditions, viz. 150 - 170°C, 20 - 40 bar and 1 - 4h-1 WHSV. It was postulated that shape-selective catalysts with defined pore sizes might improve selectivity towards mid-chain mono-methyl branched olefins. Such olefins are potential feedstocks for selectively branched detergents which have improved surfactant properties while retaining good biodegradability. NMR and GC-MS analyses of hydrogenated dimer product fractions indicated that all catalysts produce branched products, and that these products are predominantly multi-branched (i.e. with two or more branches per C12 molecule). Overall, the findings of this study suggest a similar degree of branching of two for all catalysts. Selective poisoning of the external surface of the MFI-90 catalyst using bulky bases effectively eliminated the catalytic activity, suggesting that in the case of MFI zeolite, the hexene dimerization reaction occurs largely (if not exclusively) on the external crystal surfaces which are not shape-selective.In conclusion, BEA and amorphous silica-alumina pore being too large to induce shape selectivity and MFI and TON dimerization being limited to the external, non-selective, surface sites, the production of mono-methyl branched 1-hexene dimers was not accomplished. 2015-01-02T09:08:21Z 2015-01-02T09:08:21Z 2006 Master Thesis Masters MSc http://hdl.handle.net/11427/10977 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Applied Science Sumani, Mmontshi Lebohang Oliver Production of mid-chain branched detergent-range olefins over shape-selective acid catalysts |
| thesis_degree_str | Master's |
| title | Production of mid-chain branched detergent-range olefins over shape-selective acid catalysts |
| title_full | Production of mid-chain branched detergent-range olefins over shape-selective acid catalysts |
| title_fullStr | Production of mid-chain branched detergent-range olefins over shape-selective acid catalysts |
| title_full_unstemmed | Production of mid-chain branched detergent-range olefins over shape-selective acid catalysts |
| title_short | Production of mid-chain branched detergent-range olefins over shape-selective acid catalysts |
| title_sort | production of mid chain branched detergent range olefins over shape selective acid catalysts |
| topic | Applied Science |
| url | http://hdl.handle.net/11427/10977 |
| work_keys_str_mv | AT sumanimmontshilebohangoliver productionofmidchainbrancheddetergentrangeolefinsovershapeselectiveacidcatalysts |