Description: Das Projekt "Energy saving polymerisation process for polyamide parts" wird vom Umweltbundesamt gefördert und von IGW-Leasing GmbH Dr. Gerhard Illing durchgeführt. Objective: To build a pilot plant to test the process and later to build an industrial unit to produce polyamide parts with substantial energy saving. The new process is almost continuous where polymerisation and moulding follow each other avoiding the cooling and re-melting steps. General Information: The equipment comprises two autoclaves with mixing equipment, one vacuum pump and a special extruder, with a capacity of up to 20 t/d (4,000 t/y). Caprolactam, the polyamide raw material, supplied in a molten form at 80 deg C is poured into a mixing autoclave with other necessary additives (incl. Hexamethylene diamine) under a nitrogen atmosphere. It is then heated to 230-270 deg C under a pressure of max. 20 bar. After 6-8 hours the polymerisate is transferred under vacuum in an intermediary storage vessel where further polymerisation takes place at some 520 deg C eliminating volatiles. The mass is then pumped into an extruder where temperature and vacuum can be adjusted to produce the required polymerisation grade. Additives such as plasticisers, heat stabilisers, colours, fillers, etc are added. The polymer is then extruded, cooled in water and chopped. The vapours from the intermediate containers and degassing steps are condensed, recovered and fed back into the reactor. For a 2000-4000 t/y production the energy saving can reach 15,000-30,000 kWh per day or 3-6 million kWh/yr. The project started in November 1984 with the engineering work completed in January 1985. The pilot plant was built between February 1985 and August 1985. Tests followed until November 1985 when construction of the industrial unit started. Completion is expected by December 1987. At variance with the original project description, a fourth storage tank for molten caprolactam, heated by means of thermal oil and of 29,000 litres capacity, was installed. This makes it possible to keep complete tank car loads of approximately 24 tons apart from each other in two storage systems. This ensures that caprolactam from different suppliers and possibly of different quality may be stored separately. Filters were installed upstream of the lactam storage tanks and downstream of the lactam melting vessel to prevent impurities from the tank car from entering the storage tanks and to ensure that the contents of the melting vessel may be pumped into the autoclaves free from contaminates. Opposite the pilot plant a second autoclave of 7.4 m3 capacity has been installed next to the existing 5 m3 autoclave. Both autoclaves are equipped with stirrers and heated with thermal oil. The level is radiometrically monitored. The process control is carried out automatically by the Baelz computer. The polyamide melt from the two autoclaves is pumped into the vacuum stage by means of a spinning pump. The pressure is monitored and should an over-pressure of more than 15 bar occur then the pump automatically shuts off In addition the piping is protected by a 25 bar bursting disc. In the vacuum stage...
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Kraftwerksleistung ? Zyklohexan ? Caprolactam ? Polyamid ? Wiederverwendung ? Brüden ? Chemische Industrie ? Farbstoff ? Kühlwasser ? Polymer ? Stickstoff ? Temperaturverteilung ? Weichmacher ? Zusatzstoff ? Filter ? Hardware ? Transportbehälter ? Wasserkühlung ? Tankbehälter ? Produktionstechnik ? Pumpe ? Reaktor ? Rohstoff ? Energieeinsparung ? Verfahrenstechnik ? Wärmekapazität ? Polymerisation ? REACH ? Produktivität ? Rohrleitung ? Atmosphäre ? Umweltfreundliche Technologie ? Versuchsanlage ? Pilotprojekt ? Chemische Reaktion ? Kontinuierliches Verfahren ? renewable sources of energy ? Maßstabsvergrößerung ? Vakuum ? Verfahrensforschung ? Kondensat ?
Region: Hessen
Bounding box: 9° .. 9° x 50.55° .. 50.55°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1984-11-15 - 1987-12-31
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