You once mentioned in our last discussion that it was possible to provide raffinate C4 for Butadiene extraction unit except providing current feed containing 85% butadiene.

• 上次交流中，你们曾经提到，除了可以提供现在的85%25异丁烯含量的原料外，还有可能提供丁二烯抽提装置的抽余碳四。