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Stellenbosch University

1. Tawari, Akram. Development of a cellulose acetate hollow-fine-fibre membrane.

Degree: Process Engineering, 2010, Stellenbosch University

Thesis (MScEng (Process Engineering)) – University of Stellenbosch, 2010.

ENGLISH ABSTRACT: The goal of this study is to produce cellulose acetate (CA) hollow-fine-fibre membranes with good water flux performance in the 95 – 96% salt retention range for brackish water desalination from first principles. First, the acceptable range of fibre dimensions was determined by means of a collapse pressure calculation using the elastic buckling pressure equation (thin shell assumption). Second, the pressure drop across the fibre wall in the hollow-fine fibre was determined by using the Hagen-Poiseuille equation, in order to determine how this would affect the chosen fibre dimensions. It was determined that the acceptable range of fibre dimensions was 222 – 247 m, and the wall thickness was 50 m. Fibres with these dimensions exhibited a high resistance to brackish water operating pressure of 20 – 25 bar, without collapse. The pressure drop calculations of these dimensions showed a sufficiently low pressure drop across the fibres. A dry-wet spinning technique was used for the preparation of the hollow-fine-fibre membranes. Hollow-fine fibres were spun using CA dissolved in a suitable solvent and non-solvent mixture comprising acetone and formamide. The effects of the dope composition and spinning parameters such as solvent to non-solvent ratio, bore fluid ratio, take-up speed, dope extrusion rate and heat treatment on the membrane morphology and performance were investigated. The spun fibres showed a good morphological structure, with no macrovoids (sponge-like structure), which is favourable for reverse osmosis (RO) applications. The hollow-fine-fibre membranes showed a good brackish water desalination performance within brackish water operating conditions. Statistical analysis was used to generate a fabrication formulation for producing cellulose acetate hollow-fine-fibre membrane for brackish water desalination with improved salt retention and flux. A three-level three-factor factorial was used to the study of the effect of spinning parameters (solvent to non-solvent ratio, bore fluid ratio and air gap distance). A regression equation was successfully established and was used to predictably produce membranes with good performance within the limits of the factors studied. RO performance of these hollow-fine-fibre membranes was good: The salt retention ranged from 96 to 98% and the permeate flux ranged from 60 to 46 L/m2.d (2 000 ppm, NaCl, 20 bar, 24 °C).

AFRIKAANSE OPSOMMING: Die studie het ten doel gehad om selluloseasetaat holveselmembrane vanaf eerste beginsels vir brakwaterontsouting te ontwikkel. Die ontsoutingsvlakke van die membrane moet tussen 95 en 96% lê met ’n aanvaarbare waterproduksievermoë. Aanvaarbare deursneë vir die holvesels is eerstens bepaal deur platval-berekeninge met behulp van die inmekaarvouvergelyking uit te voer (dunwand aanname). Hierna is drukval oor die wand van die holvesel met behulp van die Hagen-Poiseuille vergelyking bepaal ten einde vas te stel hoe dit…

Advisors/Committee Members: Bradshaw, S. M., Jacobs, E. P., University of Stellenbosch. Faculty of Engineering. Dept. of Process Engineering..

Subjects/Keywords: Process engineering; Cellulose acetate; Hollow-fine-fibre; Elastic buckling; Hollow-fine-fibre membranes

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Tawari, A. (2010). Development of a cellulose acetate hollow-fine-fibre membrane. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/4253

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Tawari, Akram. “Development of a cellulose acetate hollow-fine-fibre membrane.” 2010. Thesis, Stellenbosch University. Accessed January 19, 2020. http://hdl.handle.net/10019.1/4253.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Tawari, Akram. “Development of a cellulose acetate hollow-fine-fibre membrane.” 2010. Web. 19 Jan 2020.

Vancouver:

Tawari A. Development of a cellulose acetate hollow-fine-fibre membrane. [Internet] [Thesis]. Stellenbosch University; 2010. [cited 2020 Jan 19]. Available from: http://hdl.handle.net/10019.1/4253.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tawari A. Development of a cellulose acetate hollow-fine-fibre membrane. [Thesis]. Stellenbosch University; 2010. Available from: http://hdl.handle.net/10019.1/4253

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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