Back to results
US 2022/0152561 A1Published application
Preparation and use of cellulose nanofiber membrane
AssigneeNvigorea AB
InventorALBERT MIHRANYAN
Life of this patent
Estimating the term…
Abstract
A filtration membrane comprising cellulose fibres, the membrane having a pore size distribution such that the modal pore diameter is between 10 nm and 25 nm and/or wherein less than 5% of the pore volume comprises pores of greater than 40 nm and having a total porosity greater than 30%.
Claims26
A laminate filtration membrane comprising a first membrane and one or more support membranes;
- wherein the first membrane comprises a paper formed from cellulose fibres, the cellulose fibres comprising elementary fibrils of diameter greater than 10 nm, the first membrane having a pore size distribution such that the modal pore diameter is between 10 nm and 25 nm and/or wherein less than 5% of the pore volume comprises pores of greater than 40 nm;
- and
- wherein the pore size distribution is determined according to BJH desorption analysis.
The laminate filtration membrane comprising a first membrane and one or more support membranes;
- wherein the first membrane comprises cellulose fibres derived from green filamentous algae, the first membrane having a pore size distribution such that the modal pore diameter is between 10 nm and 25 nm and/or wherein less than 5% of the pore volume comprises pores of greater than 40 nm.
A laminate filtration membrane comprising:
- a first membrane and one or more support membranes;
- wherein the first membrane comprises cellulose fibres, at least half of the cellulose fibres having a degree of crystallinity greater than 90%, the first membrane having a pore size distribution such that the modal pore diameter is between 10 nm and 25 nm and/or wherein less than 5% of the pore volume comprises pores of greater than 40 nm.
A method of removing particles from a feed fluid, the method comprising
- passing the feed fluid through a laminate filtration membrane, said laminate filtration membrane comprising:
- a first membrane and one or more support membranes;
- wherein the first membrane comprises a paper formed from cellulose fibres, the cellulose fibres comprising elementary fibrils of diameter greater than 10 nm, the first membrane having a pore size distribution such that the modal pore diameter is between 10 nm and 25 nm and/or wherein less than 5% of the pore volume comprises pores of greater than 40 nm;
- and
- wherein the pore size distribution is determined according to BJH desorption analysis;
- and
- retaining at least a portion of the particles on the laminate filtration membrane and produce a filtrate containing a lower concentration of the particles than the feed fluid.
4 more elements
Dependencies are inferred from the claim text.