METHOD OF ALKYD VARNISH PRODUCTION AND METHOD OF BULK COMPONENT FEED TO REACTOR WITH EXPLOSIVE MEDIU

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FIELD : chemistry. SUBSTANCE : invention concerns paint-and-varnish industry, particularly alkyd varnish production using automated control system of technological process, as well as feeding of bulk components to reactor with explosive medium. Method of alkyd varnish production involves alcoholytic re-etherification of vegetable oil by pentaerythritol with heating in inert gas flow in the presence of catalyst, followed by polyetherification of re-etherification products by phthalic anhydride with heating, water distillation with azeotropic solvent, reaction product - alkyd resin - cooling to 160-180°C, varnish preparation by mixing obtained resin with organic solvent. Re-etherification and polyetherification process is performed in reactor featuring electric induction heating system and connected to technological pipelines with stop valves. Reactor has at least one pipe socket with heat-resistant gate installed in it, and at least two water heat exchangers in the form of worm pipes, mixer, nozzle column, vertical cooler, condenser and separation vessel. Alkyd resin dissolution is performed in mixer with stop valves, mixer, jacket and reverse heat exchanger for condensation and recycling of evaporating solvents in the mixer; vegetable oil dosing and loading to reactor is performed by automated control system, where stop valves of oil feed line are opened and closed by remote controls automatically or steered from control console; dosing and loading of bulk component, such as pentaerythritol and phthalic anhydride is performed and controlled over automated control system for bulk component dosage and loading, including depacker, tanker on tension weighing device, pneumatic lift, at least one ripper, snail feeder and mentioned heat-resistant gate in pipe socket of reactor; dosing and loading of azeotropic solvent and water to worm pipes of reactor, as well as recycled water feed and control and solvent feed to mixer are performed with remote automatic control of stop valves. In addition invention claims method of bulk component feed to reactor used in production of alkyd varnish. EFFECT : reduced labour cost, improved fire protection and environmental safety. 22 cl, 1 tbl, 2 dwg, 2 ex