Verfahren zur Erhoehung der Ausbeute photochemischer Reaktionen

摘要

1354183 Preparation of cycloalkanone oximes AQUITAINE TOTAL ORGANICO 19 April 1971 [17 March 1970 21 Jan 1971] 24436/71 Heading C2C [Also in Division B1] In a photochemical reaction; particularly one in which an alicyclic oxime is prepared by reacting a cycloalkane (e.g. cyclodedecane) in the liquid state or in solution with nitrosyl chloride in a liquid phase containing sulphuric acid, the formation of deposits on the transparent surface of the reactor is prevented by heating that surface to a temperature higher than that of the reaction mixture (but not higher than 95‹ C.) to reduce the viscosity of the material adjacent to the surface. The reactants are introduced at 7 into an annular reactor 1 arranged around a high-pressure mercury lamp 2. A heat-transfer fluid is passed between the lamp and the inner wall of the reactor and is circulated by a pump 6 through a heat exchanger 5. The reaction mixture is circulated by pump 8 through a heat exchanger 9. Gases are released at 10 and reaction mixture with product is withdrawn at 11, the product being separated from the organic reactant by centrifuging at 12 and part of the latter being recycled.