the pretreatment is effective when the usd oilis mixed at moderate temperatureswith small acount of certain alkline in the presence of a phase transfer catalyst
此项预处理， 即让废油在室温条件下与少量的碱和相转移催化剂混合，是有效的。
贴主难道做的是地沟油的营生？？！ 伤天害理

此项预处理仅在室温条件下废油在与少量的碱和固相转移催化剂作用下才有效。

usd

PTC,相转移催化剂

相变催化剂

https://en.wikipedia.org/wiki/Phase-transfer_catalyst
In chemistry, a phase-transfer catalyst or PTC is a catalyst that facilitates the migration of a reactant from one phase into another phase where reaction occurs. Phase-transfer catalysis is a special form of heterogeneous catalysis. Ionic reactants are often soluble in an aqueous phase but insoluble in an organic phase in the absence of the phase-transfer catalyst. The catalyst functions like a detergent for solubilizing the salts into the organic phase. Phase-transfer catalysis refers to the acceleration of the reaction upon the addition of the phase-transfer catalyst，

想变催化剂