氯丙烯环氧化反应器气相安全控制条件

在相转移法氯丙烯环氧化反应过程中,由于少量双氧水发生无效分解生成氧气,导致反应器气相存在燃爆危险性。测试了工况条件下氯丙烯-氧-氮三元体系的燃爆特性,得出该体系的极限氧浓度值(LOC)为10.9%;考察了主要因素对气相氧浓度的影响。研究发现,要降低气相氧浓度,应尽可能降低催化剂用量,适当提高搅拌速度,严格控制H_2O_2用量;应在液相沸腾后开始H_2O_2进料,并控制反应初始阶段的H_2O_2进料量,以避免瞬间H_2O_2进料过快。

Safety-control conditions of gas phase in 3-chloropropene epoxidation reactor

Decomposition of a fraction of hydrogen peroxide to oxygen during epoxidation of 3-chloropropene to epichlorohydrin results in explosion hazards in the gas phase of the reactor.Explosion datus of 3-chloropropene/oxygen/nitrogen mixtures was measured, and the limiting oxygen concentration (LOC) of the mixture was determined as 10.9%.Furthermore, the effect of the reaction conditions on oxygen concentration in the gas phase was investigated.The results showed that in order to reduce oxygen concentration in the gas phase, catalyst quantity should be reduced as low as possible, and stirring velocity should be increased properly, and H2O2 quantity should be controlled strictly.Moreover, H2O2 should be fed in batches after the liquid phase boils, and the feeding quantity of H2O2 in the initial stage of the reaction should be kept at a low level, which would avoid feeding H2O2 instantaneously or suddenly.