The processes of feed stock modifying are introduced.

介绍了对原料进行改性的工艺。

Ammonia is the feed stock to make nitrogen-based fertilizers.

氨是氮基，化肥的原料。

It is caused by the property change of feed stock in storage process and alkadiene polymerization.

造成这一问题的主要原因，是原料油性质在存储过程中发生变化、二烯烃发生聚合。

By adding soda ash or caustic soda to the feed stock, the surface of the pellets becomes sticky and coated with fines.

在进料中加入纯碱或烧碱，小球的表面就变粘并为细粉覆盖。

The main properties of naphtha, diesel fuel fractions, catalytic cracking feed stock and residua from these crudes are also listed.

文中并列出了各种重质原油的汽油、柴油、催化裂化原料及渣油的主要性质。