3,4-二氯甲苯氨氧化制3,4-二氯苯甲腈的工艺研究

Synthesis Process of 3,4-Dichlorobenzonitrile from 3,4-Dichlorochlorotoluene by Ammoxidation

介绍了运用湍流流化床反应器工艺氨氧化合成3,4-二氯苯甲腈(3,4-dichlorochlorotoluene)的方法,考察了其反应温度、反应线速、催化剂负荷、原料配比(氧比和氨比)等工艺条件对反应结果的影响。结果表明,在反应温度395℃,原料中3,4-二氯苯甲腈、氨气和氧气的物质量比为1:4:4,反应线速度为0.2 m/s,催化剂负荷(WWH)为0.050 h-1的条件下,3,4-二氯甲苯转化率达98.5%,3,4-二氯苯甲腈的摩尔收率大于90.0%,且催化剂具有较好的稳定性。

The method that the ammoxidation of 3,4-dichlorochlorotoluene to synthesize 3,4-dichlorobenzonitrile in a turbulent fluidized bed reactor was introduced. The effects of reaction temperature, material superficial velocity, catalyst load and material ratios （oxygen ratio and ammonia ratio） on the reaction were investigated. The results show that raw material conversion and the molar yield of 3,4-dichlorobenzonitrile could reach 98.5% and 90.0% respectively under the reaction condition that the molar ratio of 3,4-dichlorochlorotoluene, NH3 and O2 is 1：4：4, the reaction temperature is 395 ℃, superficial velocity is 0.2 m/s and catalyst load in the reactor is 0.050 h^-1 The catalyst used in the experiment showed good stability.