降低FCC催化剂洗涤水中氨氮含量的研究

STUDY ON THE WASHING PROCESS OF FCC CATALYST TO REDUCE AMMONIA NITROGEN CONTENT IN WASHING WATER

针对FCC催化剂洗涤水氨氮含量高的问题,考察铵盐用量、硫酸用量及洗涤方式对FCC催化剂洗涤效果的影响。结果表明,在酸性条件下洗涤FCC催化剂可以降低铵盐的用量,且可以达到较好的洗涤氧化钠的效果。工业应用结果表明,洗涤催化剂时加入酸性水,在保证洗涤氧化钠效果的条件下,可以使催化剂洗涤过程中硫酸铵的用量减少30%,催化剂洗涤水中氨氮含量下降约30%。

Factors such as ammonium salt amount, sulfuric acid dosage and washing procedure on the washing of FCC catalyst were studied. Test results showed that washing FCC catalyst under acidic conditions could consume less ammonium salt to reach the similar sodium oxide content of catalyst. An industrial trial was carried out based on this acidic condition washing procedure and the results showed that about 30% of ammonium sulfate can be saved to obtain the same catalyst quality. Moreover, the amount of ammonia nitrogen in the washing water of FCC catalyst was lowered by about 30% which is a significant improvement in catalvst manufacture, waste treatment and environmental protection.