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Dreiser C.,University of Kaiserslautern | Gneist G.,De Dietrich Process Systems GmbH | Bart H.-J.,University of Kaiserslautern
Chemical Engineering and Technology | Year: 2013

The glass packing QVF DURAPACK® was developed to use the advantages of structured mass transfer packings, especially when handling corrosive media. To match up with the latest developments for sheet metal packings, further optimization for liquid-liquid separation processes was performed for the QVF DURAPACK®. The complex geometry of structured packings and the wall thickness of glass sheets complicate the numerical investigations. The modeling strategy is presented, and the limitations of CFD tools are given. The experimental and numerical results show similar trends as known for perforated metal structures. The extraction efficiency of the packing prototype could also be reproduced with the column design tool LLECMOD. To optimize the glass packing QVF DURAPACK® with regard to extraction efficiency, a detailed understanding of the hydrodynamic behavior is crucial. Therefore, computa-tional fluid dynamics is used and the challenges in modeling are discussed. The extraction column design tool LLECMOD was used to compare calculated mass transfer results of the developed prototype to the experimental data. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Trademark
De Dietrich, De Dietrich Process Systems GmbH and De Dietrich & Cie | Date: 1985-02-12

ROTARY DRYING MACHINES FOR USE IN INDUSTRIAL SCALE DRYING IN THE CHEMICAL, PHARMACEUTICAL AND FOOD MANUFACTURING INDUSTRIES. CHEMICAL REACTING UNITS, RECEIVERS, TANKS AND COLUMNS FOR USE IN THE CHEMICAL, PHARMACEUTIAL AND FOOD INDUSTRIES; DOMESTIC WOOD AND COAL BURNING AND GAS AND ELECTRICALLY HEATED COOKING RANGES AND OVENS; FLAT TOP-TYPE ELECTRIC COOKING RANGES; EXHAUST HOODS; DOMESTIC REFRIGERATORS AND FREEZERS; WOOD AND COAL BURNING AND GAS AND ELECTRICALLY HEATED FURNACES; WOOD, COAL AND FUEL OIL BURNING AND GAS AND ELECTRICALLY HEATED BOILERS; HOT WATER, GAS AND ELECTRICALLY HEATED RADIATORS, SAID FURNACES BOILERS AND RADIATORS BEING FOR CENTRAL HEATING SYSTEMS; WATER HEATERS; WOOD, COAL AND FUEL OIL BURNING AND GAS, ELECTRICALLY AND SOLAR HEATED ROOM SPACE HEATERS; WOOD AND COAL BURNING HEATING STOVES; HEAT PUMPS; HEAT EXCHANGERS; AND SOLAR COLLECTORS.


Trademark
De Dietrich Process Systems GmbH and DE DIETRICH United States INC. | Date: 1987-09-15

PARTS OF MACHINES, NAMELY, GLASS-LINED SEPARABLE BLADED AGITATORS.


Qvf

Trademark
De Dietrich Process Systems GmbH and QVF Process Systems Ltd | Date: 2006-01-03

METAL COUPLINGS FOR PIPELINES. LABORATORY EQUIPMENT, NAMELY, PIPELINES, FILTERS, VESSELS, STIRRERS, HEAT EXCHANGERS, COIL TYPE BOILERS, LIQUID COOLERS, VENT CONDENSERS, COLUMN, SECTIONS, COLUMN PACKING, COLUMN SUPPORTS, FEED PIPES, DISTRIBUTORS, SEPARATORS, SEALS, ADAPTORS, FILTER PLATES, COVERS, PUMPS, MEASUREMENT AND CONTROL DEVICES, NAMELY, FLOW TRANSMITTERS, FLOW INDICATOR CONTROLLERS, FLOW RECORDERS, FLOW INDICATORS, TEMPERATURE ELEMENTS, COMBINED TEMPERATURE INDICATOR AND CONTROLLERS, TEMPERATURE INDICATORS, TEMPERATURE CONTROLLERS, PRESSURE INDICATORS, PNEUMATIC CONTROL VALVES, CHART RECORDERS, VALVES, PRESSURE REGULATING VALVES, CONTROL VALVES, BY-PASS VALVES AND COUPLINGS USED IN LABORATORY EQUIPMENT, LABORATORY GLASSWARE, FITTINGS THEREFORE; AND APPARATUS FOR USE THEREWITH, NAMELY, PIPELINES, FILTERS, VESSELS, STIRRERS, HEAT EXCHANGERS, COIL TYPE BOILERS, LIQUID COOLERS, VENT CONDENSERS, COLUMN SECTIONS, COLUMN PACKING, COLUMN SUPPORTS, FEED PIPES, DISTRIBUTORS, SEPARATORS, SEALS, ADAPTORS, FILTER PLATES, COVERS, PUMPS, GAS CHROMATOGRAPHY APPARATUS AND PARTS THEREOF. APPARATUS FOR HEATING, SEPARATION, CONTROL OF FLOW AND/OR TEMPERATURE OF SOLIDS, LIQUIDS AND GASES, NAMELY, FLOW CONTROL APPARATUS COMPRISED IN WHOLE OR PART OF PIPE LINES, VALVES, FILTERS, VESSELS, HEAT EXCHANGERS, COIL TYPE BOILERS, LIQUID COOLERS, VENT CONDENSERS, COLUMN SECTIONS, COLUMN PACKING, COLUMN SUPPORTS, FEED PIPES, DISTRIBUTORS, SEPARATORS, SEALS, ADAPTORS, FILTER PLATES, COVERS, PUMPS, AND MEASUREMENT AND CONTROL DEVICES FOR CHEMICAL AND/OR PHARMACEUTICAL AND/OR INDUSTRIAL APPLICATIONS; APPARATUS FOR SOLVENT RECOVERY, NAMELY, SOLVENT RECOVERY UNITS; APPARATUS FOR REACTION, ABSORPTION AND ADSORPTION PROCESSES, NAMELY, REACTION, ABSORPTION AND ADSORPTION UNITS COMPRISED IN WHOLE OR PART OF PIPE LINES, VALVES, FILTERS, VESSELS, HEAT EXCHANGERS, COIL TYPE BOILERS, LIQUID COOLERS, VENT CONDENSERS, COLUMN SECTIONS, COLUMN PACKING, COLUMN SUPPORTS, FEED PIPES, DISTRIBUTORS, SEPARATORS, SEALS, ADAPTORS, FILTER PLATES, COVERS, PUMPS, AND MEASUREMENT AND CONTROL DEVICES FOR CHEMICAL AND/OR PHARMACEUTICAL AND/OR INDUSTRIAL APPLICATIONS; APPARATUS FOR DISTILLATION AND FLUID PROCESSING, NAMELY, DISTILLATION AND FLUID PROCESSING UNITS COMPRISED IN WHOLE OR PART OF PIPE LINES, VALVES, FILTERS, VESSELS, HEAT EXCHANGERS, COIL TYPE BOILERS, LIQUID COOLERS, VENT CONDENSERS, COLUMN SECTIONS, COLUMN PACKING, COLUMN SUPPORTS, FEED PIPES, DISTRIBUTORS, SEPARATORS, SEALS, ADAPTORS, FILTER PLATES, COVERS, PUMPS AND MEASUREMENT AND CONTROL DEVICES FOR CHEMICAL AND/OR PHARMACEUTICAL AND/OR INDUSTRIAL APPLICATIONS; DISTILLATION COLUMNS AND REFINING TOWERS FOR DISTILLATION; AIR CONDITIONING AND POLYMERIZATION INSTALLATIONS, COMPRISED IN WHOLE OR PART OF PIPE LINES, VALVES, FILTERS, VESSELS, HEAT EXCHANGERS, COIL TYPE BOILERS, LIQUID COOLERS, VENT CONDENSERS, COLUMN SECTIONS, COLUMN PACKING, COLUMN SUPPORTS, FEED PIPES, DISTRIBUTORS, SEPARATORS, SEALS, ADAPTORS, FILTER PLATES, COVERS, PUMPS AND MEASUREMENT AND CONTROL DEVICES FOR CHEMICAL AND/OR PHARMACEUTICAL AND/OR INDUSTRIAL APPLICATIONS; GAS SCRUBBERS; METAL OR GLASS IMMERSION HEAT EXCHANGERS; BOILERS, NAMELY, GLASS COIL-TYPE BOILERS FOR USE AS HEAT EXCHANGERS; AIR AND WATER FILTERS FOR INDUSTRIAL INSTALLATIONS; COILED TUBING BEING PART OF A DISTILLING, HEATING OR COOLING INSTALLATION; EVAPORATORS; HEAT ACCUMULATORS; REPLACEMENT PARTS AND FITTINGS FOR ALL THE AFORESAID GOODS; ALL MADE WHOLLY OR PRINCIPALLY OF GLASS. GLASS TUBING AND GLASS PIPING, NOT FOR SCIENTIFIC PURPOSES. PHARMACEUTICAL AND CHEMICAL PLANT CONSTRUCTION; PHARMACEUTICAL AND CHEMICAL PLANT EQUIPMENT INSTALLATION, MAINTENANCE AND REPAIR. EDUCATION AND TRAINING SERVICES, NAMELY, ARRANGING AND CONDUCTING WORKSHOPS AND SEMINARS ON THE INSTALLATION, MAINTENANCE AND REPAIR OF GLASS EQUIPMENT. SCIENTIFIC AND TECHNOLOGICAL SERVICES IN PROCESS DESIGN, MECHANICAL DESIGN, HAZARD AND OPERABILITY STUDIES AND VALIDATION ALL IN THE FIELDS OF CHEMICAL AND/OR PHARMACEUTICAL AND/OR INDUSTRIAL APPLICATIONS.


Patent
De Dietrich Process Systems GmbH | Date: 2010-09-08

The invention relates to a method for reprocessing waste acid from methods for producing nitro-aromatics, in particular for producing dinitrotoluene (DNT) or trinitrotoluene (TNT), to recover concentrated and purified sulfuric acid and nitric acid, wherein in a first stage, the waste acid is separated in a stripping column countercurrently with water vapor from the bottom of the stripping column into at least one vapor phase, which contains nitric acid and possibly nitro-organics, and a pre-concentrated sulfuric acid, and the vapor phase and the pre-concentrated sulfuric acid are condensed and/or reprocessed in downstream method stages, wherein in the first stage of the method, in addition to the stripping, according to the invention the nitric acid contained in the stripping vapor is concentrated in the presence of additional concentrated sulfuric acid so that nitric acid in a highly concentrated form suitable for feeding back into the nitriding process is obtained directly in the first stage.

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