第二种聚酰亚胺聚合物是芳香族四酸二氢化物与芳香族二异氰酸酯反应生成的。
The second polyimide polymer is prepared with aromatic tetracid dihydride and aromatic diisocyanate.
苯基、氰基、酯基、羧基在反应中不受影响。 因此，这一聚合物催化剂特别适用于和芳基、腈基、羧基和酯基相连的双键的氢化。
Thus, this polymer catalyst is especially suited to the hydrogenation of the ethylenic double bonds which are linked to aromatic, cyano, carboxyl and ester groups.
为抑制聚合物为基础的污染沉积物的形成方法，通常在碱洗的碳氢化合物形成的披露。
A method for inhibiting the formation of polymeric based fouling deposits normally formed during the caustic washing to hydrocarbons is disclosed.
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