讨论了萃取机理，推断了萃取反应式。
The extraction mechanism is discussed and the overall extraction reaction is deduced.
研究了萃取反应法合成甲基丙烯酸甲酯（ MMA）。
The synthesis of MMA by the extractive reaction method was studied.
结果表明，在低酸度区萃取主要按阳离子交换反应进行，在高酸度区溶剂化萃取反应则变得明显。
As a result, the cation exchange reaction is predominant in the low acidity region, and the salvation extraction becomes appreciable in the high acidity region.
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