Hartmann & Braun Ag

Mannesmann Aktiengesellschaft

Hartman & Braun Aktiengesellschaft

Peter Schlau

Walter Fabinski

Christian Wolff

Peter Hubschmann

Bernd Hielscher

Gunter Rumpf

An apparatus for measuring the total content of organic carbon (TOC) and nitrogen (TN) in water. The TOC value is correctly determined as the sum of the liquid, dissolved, and solid substances of a specimen of the water. The apparatus includes a NDIR gas analyzer for simultaneously measuring the concentration of CO.sub.2 and NO gas components with a phase separator, a thermal reactor, a condenser, and two amplifiers for the pneumatic signals of the receivers with an indicator for the measured TOC and TN concentrations. The specimen is split into a gaseous part and a liquid part in the phase separator. The gaseous part which essentially contains the inorganic fraction of carbon, the TIC fraction, in the form of CO.sub.2 gas is cooled in a condenser until a substantial fraction of its water vapor content is separated in the condenser by condensation. The dried gaseous part is directed via the comparison vessels as comparison gas. The gaseous part exiting from the comparison vessels is returned to the liquid part of the specimen again in its entirety and oxidized together with the latter in a thermal reactor. The gas specimen which is formed in so doing is charged via the condenser with water vapor having the same temperature as the comparison gas and is fed to the measurement chambers of the vessels as measurement gas which contains the entire carbon dioxide fraction and the entire nitrogen oxide fraction of the gas specimen.

Apparatus for measuring the total content of organic carbon and nitrogen

A catalytic reactor in which liquid media can be continuously introduced, evaporated and fed to catalytic reactions, wherein the reactor space is formed by a tubular reactor casing which is open at one end and can be closed by a reactor lid having a through-opening. A pipe acting as evaporator stage is arranged so as to extend from the region of the through-opening until deep in the reactor space and is provided with a baffle and a baffle holder at the end extending into the reactor space. The rest of the reactor space is filled at least partially with catalyst and forms a catalysis stage. The pipe, baffle and baffle holder are made of ceramic material and the pipe and baffle holder are constructed as a single piece.

Catalytic reactor

The invention relates to a method for measuring of the total content of organic carbon and of nitrogen in water. The total organic carbon value is obtained correctly as the sum of the liquid, dissolved, and solid materials of a sample of the water. The device comprises a non-dispersive infrared (NDIR) gas analyzer for the simultaneous measurement of the concentration of the gas components carbon dioxide CO.sub.2 and nitrogen oxide NO. The NDIR gas analyzer includes a phase separator (50), a thermal reactor (52), a double cooler (70), two valves (54, 56), as well as two amplifiers (58, 60) for the pneumatic signals of the receiver detectors (30, 36) with a display (62. 64) for the measured concentrations, total organic carbon and total nitrogen. The sample is split in a phase separator (50) into a gaseous and into a liquid part. The gaseous part, which comprises substantially the inorganic part of the carbon, the total inorganic carbon part in the form of carbon dioxide CO.sub.2 gas, is cooled in a cooler to such an extent that a substantial part its water vapor content is deposited in the cooler by condensation. The dried gaseous part is led as comparison gas through the comparison cuvette. This step serves to compensate the total inorganic carbon part of the sample and to compensate for unavoidable water vapor cross-sensitivities during the measurement of the carbon dioxide CO.sub.2 concentration and of the nitrogen oxide NO concentration.

Apparatus for the measurement of the total content of organic carbon and

A method for measuring of the total content of organic carbon and of nitrogen in water. The total organic carbon value is obtained correctly as the sum of the liquid, dissolved, and solid materials of a sample of the water. The device comprises a non-dispersive infrared (NDIR) gas analyzer for the simultaneous measurement of the concentration of the gas components carbon dioxide CO.sub.2 and nitrogen oxide NO. The NDIR gas analyzer includes a phase separator (50), a thermal reactor (52), a double cooler (70), two valves (54, 56), as well as two amplifiers (58, 60) for the pneumatic signals of the receiver detectors (30, 36) with a display (62. 64) for the measured concentrations, total organic carbon and total nitrogen. The sample is split in a phase separator (50) into a gaseous and into a liquid part. The gaseous part, which comprises substantially the inorganic part of the carbon, the total inorganic carbon part in the form of carbon dioxide CO.sub.2 gas, is cooled in a cooler to such an extent that a substantial part its water vapor content is deposited in the cooler by condensation. The dried gaseous part is led as comparison gas through the comparison cuvette. This step serves to compensate the total inorganic carbon part of the sample and to compensate for unavoidable water vapor cross-sensitivities during the measurement of the carbon dioxide CO.sub.2 concentration and of the nitrogen oxide NO concentration.

Method for the measurement of the total content of organic carbon and

Four corrosion-proof steel tubes are arranged in a circle, two of the steel tubes serving as reference chamber, the other two being serially flown through by a measuring gas. Each cell contains centrally a heating coil of nickel on a PTFE mandrel held by an electrode which is fed through a brazed on ceramic insulation in the top portion of the respective chamber. The other electrode is fed through off center; each electrode is hollow in the feed-through.

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Frankfurt-am-Main, Germany

Peter Schlau