Tirohia te whiti i raro nei, ka whakautu i te patai i muri mai i te reo ano o te whiti: I nga wa tata nei, ko te kamupene matū a Showa Denko, i whakatuwhera i tetahi tipu waikura ethylene i Ōita, Japan, i te tau 1997, i hokona te hurihanga o te taumata kotahi o te ethylene ki te waikawa acetic. Ko te tukanga e whakaohohia ana e te kaitautoko whakarewa palladium i tautokohia i runga i te waikawa heteropoly penei i te waikawa silicotungstic. Te tukanga rite te whakamahi i te kaitautoko whakarewa ano i runga i te waikawa silicotungstic me te silica: Pātai: He aha tenei tukanga e whakaohohia ana?
he kaiwhakawhiwhi whakarewa palladium i tautokohia i runga i te waikawa heteropoly