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塔里木油田塔西南石化厂为解决尿素产品板结的问题,采用了在尿素中加入甲醛的技改方案。介绍了甲醛及其水溶液的理化性质;简述了在尿素中添加甲醛溶液的工艺原理和工艺流程。监测分析结果表明:控制尿素中甲醛含量在0.18%～0.3%之间时,尿素中总氮、水分、缩二脲含量无明显变化,而尿素颗粒强度明显提高,由未添加甲醛前的7.3 N提高到8.6 N。此外,尿素产品的粉尘量明显减少,尿素成品粒度由98%上升到98.5%。
Tarim Oilfield tower southwest petrochemical plant to solve the problem of urea products compaction, the use of formaldehyde in the urea in the technical transformation program. The physical and chemical properties of formaldehyde and its aqueous solution are introduced. The technological principle and technological process of adding formaldehyde solution to urea are described briefly. The results of monitoring and analysis showed that when the content of formaldehyde in urea was controlled between 0.18% ~ 0.3%, the contents of total nitrogen, moisture and biuret in urea did not change obviously, but the strength of urea granules increased obviously. From 7.3 N Increase to 8.6 N. In addition, the amount of dust in urea products was significantly reduced, the finished urea product increased from 98% to 98.5%.