Solvent removal process
AssigneeSurrey Aquatechnology Limited
InventorsAbdulsalam Al-Mayahi, Adel Sharif
Life of this patent
Estimating the term…
Abstract
A process for removing a solvent from a first solution, said process comprising positioning a selective membrane between the first solution and a second solution having a higher osmotic potential than the first solution, such that solvent from the first solution passes across the membrane to dilute the second solution, and extracting solvent from the second solution, wherein the membrane has an average pore size of at least 10 Angstroms, and wherein the second solution contains solute species that are too large to pass through the pores of the membrane.
Claims17
A process for removing water from a first solution, said process comprising:
- i) providing a first solution comprising seawater, brackish water or waste water;
- ii) forming a second solution having a higher osmotic potential than the first solution by dissolving a water soluble solute in water, the second solution substantially free of components that cause membrane fouling or scaling;
- iii) directly adding into the second solution an additive selected from the group consisting of an anti-scaling agent, an anti-fouling agent, and combinations thereof;
- a) positioning a first membrane between the first solution and the second solution, such that water from the first solution passes across the first membrane to dilute the second solution by direct osmosis, and
- b) passing the diluted second solution through a second membrane, wherein the second solution contains solute species too large to pass through the pores of the first selective membrane and the second membrane.
A process for removing water from a first solution, said process comprising:
- positioning a first selective membrane between
- (i) a first solution comprising seawater, brackish water, or waste water and
- (ii) a second solution with a higher osmotic potential than the first solution, the second solution comprising a water soluble solute, the second solution substantially free of components that cause membrane fouling;
- passing water, by way of direct osmosis, through the first selective membrane, from the first solution to the second solution to form a diluted second solution;
- adding, directly into the second solution, an anti-scaling agent;
- circulating a portion of the second solution in a continuous loop;
- and
- passing the diluted second solution through a second membrane.
A process for removing water from a first solution, said process comprising:
- positioning a first selective membrane between
- (i) a first solution comprising seawater, brackish water, or waste water and
- (ii) a second solution with a higher osmotic potential than the first solution, the second solution comprising a water soluble solute selected from the group consisting of MgSO4.6H2O, MgSO4.7H2O, MgCl2.6H2O, Na2SO4.10H2O, CaCl2.2H2O, CaCl2.6H2O, potassium alum.24H2O, potassium chloride, sodium chloride, and Na2HPO4.12H2O in water;
- passing water, by way of direct osmosis, through the first selective membrane, from the first solution to the second solution to form a diluted second solution;
- adding, directly into the second solution, an anti-scaling agent;
- circulating a portion of the second solution in a continuous loop;
- and
- passing the diluted second solution through a second membrane.
A process for removing water from a first solution, said process comprising:
- positioning a first selective membrane between
- (i) a first solution comprising seawater, brackish water, or waste water and
- (ii) a second solution with a higher osmotic potential than the first solution, the second solution comprising a water soluble salt, the second solution substantially free of components that cause membrane fouling;
- passing water, by way of direct osmosis, through the first selective membrane, from the first solution to the second solution to form a diluted second solution;
- adding, directly into the second solution, an anti-scaling agent;
- circulating a portion of the second solution in a continuous loop;
- passing the diluted second solution through a second membrane;
- and
- extracting water from the diluted second solution.
Dependencies are inferred from the claim text.