# US 2019/0170710 A1 · Flame ionization detection burner assemblies for use in compressible fluid-based chromatography systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170710 A1 - Document ID: US20190170710A1 - Status: Published application - Kind: A1 - Application number: 16/242,754 - Filed: 2019-01-08 - Published: 2019-06-06 - Earliest claimed: 2014-05-16 - Assignees: Waters Technologies Corporation - Applicants: Waters Technologies Corporation - Inventors: Michael O. Fogwill; Joseph D. Michienzi; James P. Murphy - Web page: https://patentgrep.com/patent/US20190170710A1 ## CPC - G01N 30/68: Flame ionisation detectors - F23D 14/00: Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid - B01D 15/40: using supercritical fluid as mobile phase or eluent - F23D 2200/00: Burners for fluid fuel - F23D 2206/00: Burners for specific applications - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - F23D: BURNERS - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract The present disclosure relates to burner assemblies of flame-based detectors. These burner assemblies are configured to deliver decompressed mobile phase of supercritical fluid chromatography systems to the flame of a flame-based detector while providing for improved optimization of analyte response as well as enhanced flame stability during operation. ## Claims ### Claim 1 A burner assembly of a flame-based detector comprising: (1) a burner comprising a burner body having a fluid inlet for receiving combustion gases and a fluid outlet for delivering combustion gases to a flame position, the burner body defining a flow path extending from the fluid inlet to the flame position and having a longitudinal axis; and (2) a restrictor comprising a hollow body comprising a first end for receiving at least a portion of a mobile phase flow stream from a chromatography system and a second end for delivering the at least a portion of the mobile phase flow stream after pressure reduction to the burner; and wherein during flame-based detection of one or more constituents of the at least a portion of the mobile phase flow stream: at least the second end of the restrictor is inserted into the burner; and the second end of the restrictor that is angled to deliver the mobile phase flow stream to the burner body flow path at an angle substantially non-parallel to the longitudinal axis of the burner. ### Claim 2 (canceled) ### Claim 3 (depends on 1) The burner assembly of claim 1, wherein the second end of the restrictor is adapted to deliver the mobile phase flow stream at an angle of at least 25 degrees with respect to the longitudinal axis of the burner. ### Claim at position 4 4-11. (canceled) ### Claim 12 A burner assembly of a flame-based detector comprising: (1) a burner comprising a burner body having a fluid inlet for receiving combustion gases and a fluid outlet for delivering combustion gases to a flame position, the burner body having a longitudinal axis and further comprising an interior wall surface defining an inner perimeter of the burner body and one or more members extending from the interior wall surface at an angle substantially non-parallel to the longitudinal axis; and (2) a restrictor comprising a hollow body comprising a first end for receiving at least a portion of a mobile phase flow stream from a chromatography system and a second end for delivering the at least a portion of the mobile phase flow stream after pressure reduction to the burner; wherein during flame-based detection of one or more constituents of the at least portion of the mobile phase flow stream: at least the second end of the restrictor is contained within the burner; and the one or more members extending from the interior wall are dimensioned and configured to deflect the mobile phase flow stream in a direction substantially non-parallel to the longitudinal axis. ### Claim 13 (depends on 12) The burner assembly of claim 12, wherein the interior wall surface of the burner defines a tortuous path between the second end of the restrictor and the flame position. ### Claim 14 (depends on 12) The burner assembly of claim 12, wherein the one or more members is a baffle. ### Claim 15 (depends on 12) The burner assembly of claim 12, wherein the one or more members is porous. ### Claim 16 (depends on 12) The burner assembly of claim 12, wherein the one or more members are tapered. ### Claim 17 A method of maintaining a flame in a burner assembly of a flame-based detector comprising (1) providing the burner assembly comprising: (a) a burner comprising a burner body having a fluid inlet for receiving combustion gases and a fluid outlet for delivering combustion gases to a flame position having a flame, the burner body having a longitudinal axis and further comprising an interior wall surface defining an inner perimeter of the burner body a and one or more member extending from the interior wall surface at an angle substantially non-parallel to the longitudinal axis, and (b) a restrictor comprising a hollow body comprising a first end for receiving at least a portion of a mobile phase flow stream from a chromatography system and a second end for delivering the at least a portion of the mobile phase flow stream after pressure reduction to the burner, the second end of the restrictor sized and inserted into the inner burner; (2) passing at least a portion of the mobile phase flow stream through the restrictor; and (3) delivering at least the portion of the mobile phase flow stream into the burner and to the flame position such that the mobile phase flow stream flows to the flame along one or more fluid paths non-parallel to the longitudinal axis. ### Claim at position 11 18-21. (canceled) ### Claim 22 (depends on 17) The method of claim 17, wherein the at least a portion of the mobile phase flow stream is passed through the restrictor at a flow rate of 40 mL/min or greater.