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1. (WO2018143883) A FILTER APPARATUS AND A METHOD FOR REMOVING DISSOLVED ORGANIC COMPOUNDS FROM A WATER BASED LIQUID
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CLAI MS

1 . A filter apparatus (1 , 1 1 ) for removing dissolved organic compounds from a water based liquid , the filter apparatus (1 , 1 1 ) comprising at least one filter un it (2, 12, 20) in the form of a container (3, 13, 21 ) in which at least one inlet (4, 14, 22, 23) and at least one outlet (5, 16, 1 7, 24) are provided , a filter bed (6, 25) being arranged in the at least one container (3, 13, 21 ) between the at least one inlet (4, 14, 22, 23) and the at least one outlet (5, 16, 1 7, 24), so that water based liqu id can pass into the container (3, 13, 21 ) via the at least one inlet (4, 14, 22, 23), through the filter bed (6, 25), and out via the at least one outlet (5, 16, 1 7, 24) ,

characterised in

that the filter bed (6, 25) comprises at least one layer of an adsorbent comprising an amorphous precipitated silica material , wherein the amorphous precipitated silica material has a porosity with an average pore width of less than 10 nm .

2. The filter apparatus according to claim 1 , wherein the amorphous precipitated silica material has a porosity with an average pore width within the range of 1 -9 nm.

3. The filter apparatus according to claim 1 or 2, wherein the amorphous precipitated silica material has been prepared via the precipitation of sodium silicate with sodium chloride by mixing an aqueous sodium silicate solution with aqueous sodium ch loride.

4. The filter apparatus according to any one of the preceding claims, wherein the amorphous precipitated silica material has a

BET surface area of at least 100 m2/g , preferably at least of 300 m2/g .

5. The filter apparatus according to any one of the preceding claims, wherein the amorphous precipitated silica material has a total pore volume within the range of 0.50-1 .2 cm3/g .

6. The filter apparatus according to any one of the preceding claims, wherein the amorphous precipitated silica material has a density within the range of 0.06-0.1 g/cm3.

7. The filter apparatus according to any one of the preceding claims, wherein the amorphous precipitated silica material has a hydrophilic surface.

8. The filter apparatus according to any one of claims 1 -6, wherein the adsorbent has been functionalised using at least one type of functional grou p to obtain a hydrophobic surface.

9. The filter apparatus according to any one of the preceding claims, wherein the adsorbent is in the form of granu les having an average particle size within the range of 0.5-2 mm.

10. The filter apparatus according to any one of the preceding claims, comprising at least two filter units (12, 20) connected in series, so that the water based liquid can be passed through the filter bed (25) of each filter unit (12 , 20) successively.

1 1 . The filter apparatus according to claim 10, further comprising bypass means for selectively bypassing at least one of said filter units (12 , 20) .

12. Use of an amorphous precipitated silica material as an adsorbent for removing dissolved organic compounds from a water based liquid , wherein the amorphous precipitated silica material has a porosity with an average pore width of less than 10 nm .

13. Use of a filter apparatus according to any one of claims 1 -1 1 for removing dissolved organic compounds from a water based liqu id .

14. A method for removing dissolved organic compounds from a water based liquid , comprising passing the water based liquid through a filter apparatus (1 ) according to any one of claims 1 -1 1 .