Patent GB-1029084-A (GB)
Title: A method of,and apparatus for,purifying liquids
Inventor: NORTH WILLIAM MAURICE
IPC: B23B27/16
Filed: 1963-04-09
Abstract: <PICT:1029084/C6-C7/1> In purifying a liquid, such as a sugar liquor, it is passed, through a valve 21 and pipe 9, upwardly through a bed of adsorbent granules, e.g. of bone char, contained in an elongated, vertical vessel having a cylindrical body 1, an upwardly tapering conical top 2 and a downwardly tapering conical base 3 merging, by a curved portion 4, into the body.  The axial length of the body is at least 1.5 times its diameter.  The velocity of the rising liquid may be of such magnitude that the force it exerts on the adsorbent granules exceeds their weight.  Purified liquid leaves the top 2 through a pipe 19 and valve 22.  A hollow cone 5 is disposed, vertex uppermost in the vessel, at substantially the level of the curved portion 4. The pipe 9 conducts the liquid into the hollow cone 5, and the liquid then passes round its lower edge 7 and through an annular gap 8, into the body 1.  A vent pipe 10, connected to a suction pump (not shown), may be provided for periodic removal of any gas accumulating in the cone 5. Contaminated adsorbent granules are removed, from the base of the vessel, through a pipe 11 and valve 12. A wholly or partly foraminous member 13, e.g. made entirely of perforated sheet or woven material, is provided, within the top 2, to constrain the adsorbent granules and so prevent them from entering the space 18.  The member 13 may be conical and may have an inner wire gauze portion 14 and an outer sheet metal portion 15 peripherally clamped between the top 2 and the body 1.  Fresh adsorbent granules are fed, from a hopper 17, into the vessel through a pipe 16, e.g. provided with a valve (not shown), passing through the top 2 and joined to the member 13.  The pipe opens into the space 18 and rises above the top 2, so that there is always some purified liquid in the pipe 16, to ensure that fresh adsorbent granules are soaked therein before they enter the vessel.  During the introduction of fresh adsorbent granules and removal of contaminated granules, the flow of liquid is stopped by closing the valve 21.  One or more vibrators 20, preferably electrically operated, are rigidly attached to the vessel, preferably to its top and the upper part of its body, to compact the adsorbent granules, e.g. during periods when they are being replaced. Between 5 and 50%, by volume, of the adsorbent granules may be withdrawn and replaced.ALSO:In purifying a liquid, such as a sugar liquor, it is passed, through a valve 21 and pipe 9, upwardly through a bed of adsorbent granules, e.g. of bone char, contained in an elongated, vertical vessel having a cylindrical body 1, an upwardly tapering conical top 2 and a downwardly tapering conical base 3 merging, by a curved portion 4, into the body.  The axial length of the body is at least 1.5 times its diameter. The velocity of the rising liquid may be of such magnitude that the force it exerts on the adsorbent granules exceeds their weight.  Purified liquid leaves the top 2 through a pipe 19 and valve 22.  A hollow cone 5 is disposed, vertex uppermost in the vessel, at substantially the level of the curved portion 4.  The pipe 9 conducts the liquid into the hollow cone 5, and the liquid then passes round its lower edge 7 and through an annular gap 8, into the body 1.  A vent pipe 10, connected to a suction pump (not shown), may be provided for periodic removal of any gas accumulating in the cone 5. Contaminated adsorbent granules are removed, from the base of the vessel, through a pipe 11 and valve 12.  A wholly or partly foraminous member 13, e.g. made entirely of perforated sheet or woven material, is provided, within the top 2, to constrain the adsorbent granules and so prevent them from entering the space 18. The member 13 may be conical and may have an inner wire gauze portion 14 and an outer sheet metal portion 15 peripherally clamped between the top 2 and the body 1.  Fresh adsorbent granules are fed, from a hopper 17, into the vessel through a pipe 16, e.g. provided with a valve (not shown), passing through the top 2 and joined to the member 13.  The pipe 19 opens into the space 18 and rises above the top 2, so that there is always some purified liquid in the pipe 16, to ensure that fresh adsorbent granules are soaked therein before they enter the vessel. During the introduction of fresh adsorbent granules and removal of contaminated granules, the flow of liquid is stopped by closing the valve 21.  One or more vibrators 20, preferably electrically operated, are rigidly attached to the vessel, preferably to its top and the upper part of its body, to compact the adsorbent granules, e.g. during periods when they are being replaced. Between 5 and 50%, by volume, of the adsorbent granules may be withdrawn and replaced.