GB867152A - Method of oxygen recycle in ozonization - Google Patents

Abstract

<PICT:0867152/IV (b)/1> <PICT:0867152/IV (b)/2> In the production of an ozonide by reacting ozonised oxygen e.g. containing 2% of ozone, with an unsaturated carboxylic acid, removing entrained organic substances from the used oxygen by contracting with a solid absorbent, reozonising the purified oxygen, and recycling to the ozonide production step, residual ozone in the oxygen is decomposed before the contact with the solid absorbent by contacting with a catalyst comprising one or more of an iron oxide, cupric oxide, silver oxide, nickelous oxide, and barium peroxide. The oxygen may e.g. be passed through a rusted mild steel tube or a glass tube containing rusted mild steel turnings or an iron oxide produced by the interaction of ferrous sulphate or ferric nitrate and sodium carbonate. The catalyst may alternatively be prepared by pelleting and calcining a mixture of diatomaceous earth and a saturated solution of cupric nitrate. The temperature of decomposition may be 15-100 DEG C. The solid absorbent may be active silica, alumina, or carbon. The carboxylic acid may be commercial oleic acid or rice bran fatty acid, and may be mixed with a solvent consisting of caproic and pelargonic acid. As shown oxygen is passed round a cycle comprising an ozoniser 1, a reactor 2, a cyclone 3, a water wash tower 4, an ozone decomposer 5, an absorber 6, and a blower 7.ALSO:In the production of an ozonide by reacting ozonised oxygen, e.g. containing 2% of <PICT:0867152/III/1> <PICT:0867152/III/2> ozone, with an unsaturated carboxylic acid, removing entrained organic substances from the used oxygen by contacting with a solid absorbent, reozonising the purified oxygen, and recycling to the ozonide production step, residual ozone in the oxygen is decomposed before the contact with the solid absorbent by contacting with a catalyst comprising one or more of an iron oxide, cupric oxide, silver oxide, nickelous oxide, and barium peroxide. The oxygen may, e.g. be passed through a rusted mild steel tube or a glass tube containing rusted mild steel turnings or an iron oxide produced by the interaction of ferrous sulphate or ferric nitrate and sodium carbonate. The catalyst may alternatively be prepared by pelleting and calcining a mixture of diatomaceous earth and a saturated solution of cupric nitrate. The temperature of decomposition may be 15-100 DEG C. The solid absorbent may be active silica, alumina, or carbon. The carboxylic acid may be commercial oleic acid or rice bran fatty acid, and may be mixed with a solvent consisting of caproic and pelargonic acid. As shown oxygen is passed round a cycle comprising an ozoniser 1, a reactor 2, a cyclone 3, a water wash tower 4, an ozone decomposer 5, an absorber 6, and a blower 7.