求翻译：本设计是以丙烯，氨和氧气为原料，年产2500t的丙烯腈生产工艺设计。本文采用的是原料来源丰富、操作简单的丙烯氨氧化法生产丙烯腈。丙烯腈是石油化学工业的重要产品，是合成聚丙烯腈纤维，丁腈橡胶和合成塑料的重要单体。设计首先阐述了丙烯腈的性质及其现状和发展趋势；然后介绍了国内外工艺流程的的同时，重点介绍了本设计的工艺流程。其次是计算部分，对主要单元进行物料和热量衡算，对反应器等各主要设备进行了工艺计算，并根据计算数据选定设备的型号。是什么意思？

The design is based on propylene, ammonia and oxygen as raw materials, the annual output of 2500t of acrylonitrile production process design. In this paper, is a rich source of raw materials, easy-to-the ammoxidation of propylene production of acrylonitrile. Acrylonitrile is an important product of

This design is based on propylene, ammonia and oxygen as a raw mater