Liquid phase chromatography apparatus

Claim 2

In a liquid phase chromatography apparatus comprising a tubular column, with two ends, for receiving a charge of powdery solid material, a porous plate on each of said ends, one of said plates being fastened thereon and the other plate being able to move axially inside the column by means of a jack to thus compress the charge in the column, the improvement wherein comprising said charge (5) being contained in a removable rigid or semi-rigid cartridge (4) with an outside diameter approximately equal to the inside diameter of column (1), the column being formed by two divisible half-cylinders (2) which are clamped together around said cartridge (4).

Claim 3

Chromatography apparatus according to claim 1, wherein the inside of column (1) comprises, at each of its ends, annular grooves for receiving corresponding washers or shoulders (11, 23), respectively, of a column head (8) or said jack (22), respectively, to fix their position during operation of the column.

Claim 4

Chromatography apparatus according to claim 2, comprising at an end thereof, a column head (8) terminated by a piston (8a) with an outside diameter approximately equal to the inside diameter of cartridge (4), an annular groove being made in the lateral surface of said piston (8a) for receiving a seal (10).

Claim 5

Chromatography apparatus according to claim 2 comprising, at one end thereof, a column head including said jack (22), said jack (22) comprising a tubular brace (24), said tubular brace (24) having two ends, the ends being provided with first and second pistons (13, 21), respectively, said first piston (13), positioned at an end of said column head proximal to said column (1), being slidable within said cartridge (4), said second piston (21), located at an end of said column head distal to said column (1), being slidably positioned within a compression cylinder (21a) with an inside diameter greater than that of cartridge (4), said compression cylinder (21a) being extended in the direction of column (1) by a sleeve (22) with an outside diameter approximately equal to the inside diameter of column (1) and provided on the inside with a shoulder (23) for engaging in a corresponding annular groove of the inside of column (1), the first (13) of said pistons comprising an axial passage connected to a supply tube (17) through which liquid to be analyzed or prepared passes.

Claim 6

Chromatography apparatus according to claim 2, wherein said cartridge (4) is pre-assembled and pre-filled.

Claim 7

Chromatography apparatus according to claim 1 comprising at an end thereof, a column head (8) terminated by a piston (8 a) with an outside diameter approximately equal to the inside diameter of cartridge (4), an annular groove being made in the lateral surface of said piston (8a) for receiving a seal (10).

Claim 8

Chromatography apparatus according to claim 6 comprising, at one end thereof, a column head including said jack (22), said jack (22) comprising a tubular brace (24), said tubular brace (24) having two ends, the ends being provided with first and second pistons (13, 21), respectively, said first piston (13), positioned at an end of said column head proximal to said column (1), being slidable within said cartridge (4), said second piston (21), located at an end of said column head distal to said column (1), being slidably positioned within a compression cylinder (21a) with an inside diameter greater than that of cartridge (4), said compression cylinder (21a) being extended in the direction of column (1) by a sleeve (22) with an outside diameter approximately equal to the inside diameter of column (1) and provided on the inside with a shoulder (23) for engaging in a corresponding annular groove of the inside of column (1), the first (13) of said pistons comprising an axial passage connected to a supply tube (17) through which liquid to be analyzed or prepared passes.

Claim 9

Chromatography apparatus according to claim 6, wherein said cartridge (4) is pre-assembled and pre-filled.

Claim 10

Chromatography apparatus according to claim 1 comprising, at one end thereof, a column head including said jack (22), said jack (22) comprising a tubular brace (24), said tubular brace (24) having two ends, the ends being provided with first and second pistons (13, 21), respectively, said first piston (13), positioned at an end of said column head proximal to said column (1), being slidable within said cartridge (4), said second piston (21), located at an end of said column head distal to said column (1), being slidably positioned within a compression cylinder (21a) with an inside diameter greater than that of cartridge (4), said compression cylinder (21a) being extended in the direction of column (1) by a sleeve (22) with an outside diameter approximately equal to the inside diameter of column (1) and provided on the inside with a shoulder (23) for engaging in a corresponding annular groove of the inside of column (1), the first (13) of said pistons comprising an axial passage connected to a supply tube (17) through which liquid to be analyzed or prepared passes.

Claim 11

Chromatography apparatus according to claim 9, wherein a tip (15) is screwed axially into said first piston (13), a connector (16) in turn being mounted on said tip (15) and connected to said supply tube (17), said supply tube extending through said brace (24) and wall (2) of said column (1) to extend therebeyond, and which is extended from said tip (15) to cartridge (4) by an axial passage made through said connector (16), said tip (15) and said first cylinder (13), to allow the circulation of the liquid which is to be analyzed or prepared from an outside tank.

Claim 12

Chromatography apparatus according to claim 10, wherein said supply tube (17) is connected to a supply pipe (18) which is connected to said outside tank of liquid to be analyzed or prepared and on which are mounted a pump (19) and an injector (20).

Claim 13

Chromatography apparatus according to claim 11, wherein a portion of said compression chamber (21a) facing a side of said second piston (21) distal to said column (1), is connected by a pipe (26) to said supply pipe (18) between pump (19) and injector (20), while a pipe (25) for connection to the atmosphere is connected to a portion of said compression chamber (21a) facing a side of said second piston (21) proximal to said column (1).

Claim 14

Chromatography apparatus according to claim 12, wherein the length of said brace (24) is selected is a function of that of said cartridge.

Claim 15

Chromatography apparatus according to claim 11, wherein the length of said brace (24) is selected as a function of that of said cartridge (4).

Claim 16

Chromatography apparatus according to claim 10, wherein the length of said brace (24) is selected as a function of that of said cartridge (4).

Claim 17

Chromatography apparatus according to claim 10, wherein said cartridge (4) is pre-assembled and pre-filled.

Claim 18

Chromatography apparatus according to claim 9, wherein said cartridge (4) is pre-assembled and pre-filled.

Claim 19

Chromatography apparatus according to claim 9, wherein the length of said brace (24) is selected as a function of that of said cartridge (4).

Claim 20

Chromatography apparatus according to claim 1, wherein said cartridge (4) is pre-assembled and pre-filled.

Claim 21

Chromatography apparatus according to claim 19, wherein the length of said brace (24) is selected as a function of that of said cartridge.