公开(公告)号：US3623843A

公开(公告)日：1971-11-30

申请号：US3623843D

申请日：1969-09-10

Applicant: STANFORD RESEARCH INST

Inventor： BROWNLEE ROBERT G

IPC: G01N25/14 ,  G01N30/80

CPC classification number: G01N30/80 ,  G01N25/145

Abstract: APPARATUS FOR CONDENSING AND COLLECTING MICROGRAM AND LARGER AMOUNTS OF ORGANIC VAPORS PRESENT IN A GAS CHROMATOGRAPHY EFFLUENT WITHOUT ENGENDERING FOG DROPLETS. THE APPARATUS COMPRISES A LENGTH OF SMALL ALUMINUM TUBING ADAPTED TO RECEIVE AN OPEN-ENDED CAPILLARY OR OTHER GLASS TUBE INTO WHICH THE GAS SAMPLE IS PASSED FOR CONDENSATION, SAID ALUMINUM TUBE BEING MOUNTED AT THE SAMPLE RECEIVING END IN A HEATED ALUMINUM BLOCK AND, AT THE OTHER END, IN A REFRIGERATED ALUMINUM BLOCK SPACED FROM THE HEATED BLOCK, AND WITH THE INTERVENING LENGTH OF TUBING BETWEEN THE BLOCKS BEING THERMALLY INSULATED SO AS TO PROVIDE AN EVEN TEMPERATURE GRADIENT ALONG SAID LENGTH RANGING FROM VAPORIZATION TO CONDENSATION TEMPERATURES. THE ORGANIC VAPORS PRESENT IN SAMPLE DIRECTED INTO THE GLASS TUBE ARE CONDENSED THEREIN, WHILE ANY INERT CARRIER COMPONENTS THEREOF ARE DISCHARGED FROM THE OPEN, DOWNSTREAM END OF THE TUBE.

公开(公告)号：US3590866A

公开(公告)日：1971-07-06

申请号：US3590866D

申请日：1969-09-10

Applicant: STANFORD RESEARCH INST

Inventor： BROWNLEE ROBERT G

IPC: F16L19/065 ,  F16L39/00 ,  G01N30/10 ,  G01N30/62 ,  G01N30/84 ,  G05D11/00 ,  F15B21/04

CPC classification number: F16L19/065 ,  F16L39/00 ,  G01N30/10 ,  G01N30/62 ,  G01N30/84 ,  G05D11/006 ,  Y10T137/8593

Abstract: A capillary gas-splitting device incorporating a gas-receiving fitting provided at one end with a cylindrical bore and, leading therefrom, a pair of gas outlet tubes between which the entrant gas is split in a ratio which remains constant despite varying gas inlet pressures and flow rates. The first of said tubes incorporates a relatively short section of capillary tubing at any position along its length, and it opens into the bore adjacent the bottom thereof. The second of said tubes is of capillary size and extends into the bore with its extremity running axially thereof for opening against the incoming gas. Though admitted under pressure, the gas is discharged from each tube at atmospheric pressure, and the ratio of the flow rate of incoming gas passing through the one tube as compared with that through the other is directly proportional to the respective capillary lengths in the two tubes. The capillary tube is adapted at its gas-entrant end to receive lengths of wire of extremely small diameter whereby the split ratio of gases passing through the two tubes may be changed as desired. The exit end of the capillary tube may be provided with a fitting adapted to receive nitrogen or other inert gases and to discharge the same in an annular fashion about the end of the capillary tube for even mixing with the gas stream discharged therefrom.