Iyini i-intermediate yezemithi?

Ama-intermediate emithi, ngamafuphi, amakhemikhali asetshenziswayo noma imikhiqizo yamakhemikhali esetshenziswa enqubweni yokwenziwa kwemithi. Ziyimikhiqizo enezakhiwo ezikhethekile ezenziwe ngokusabela kwamakhemikhali ezinto ezingavuthiwe ezimbili noma ngaphezulu ezihlukene ngezilinganiso ezifanele. Lezi ziphakathi ziyafana kodwa zihlukile ngesakhiwo samakhemikhali, njenge-ethyl acetate kanye ne-n-butyl propionate, i-methyl methacrylate ne-methyl acrylate, njll. Azisetshenziselwa kuphela ukwenza izinhlobo ezahlukene zezidakamizwa, kodwa futhi ukulungisa izakhiwo ezihlukahlukene zezidakamizwa, ezifana njengokuzinza, ukuncibilika, njll. Isici esibalulekile sabaxhumanisi bemithi ukuthi nakuba bedlala indima ebalulekile enqubweni yokukhiqiza izidakamizwa, abadingi ilayisense yokukhiqiza umuthi. Lokhu kusho ukuthi zingakhiqizwa ezitshalweni zamakhemikhali ezijwayelekile futhi, inqobo nje uma zihlangabezana nezindinganiso ezithile zekhwalithi, zingasetshenziswa ekuhlanganiseni kwemithi. Kuyaphawuleka ukuthi i-intermediate yemithi ngokuvamile ibiza kakhulu, ehlobene nezinqubo zabo zokukhiqiza eziyinkimbinkimbi kanye nezidingo eziqinile zekhwalithi. Kodwa yilobu bunkimbinkimbi kanye nokukhethekile okwenza abaphakathi kwezemithi bathathe isikhundla esibalulekile embonini yezemithi. Ngaphezu kwalokho, abaxhumanisi bemithi nabo bayingxenye ebalulekile embonini yezemithi yaseChina. Ngemuva kwamashumi eminyaka okuthuthukiswa, izinto zokusetshenziswa zamakhemikhali kanye nezimaphakathi ezidingekayo ekukhiqizweni kwemithi yaseChina ziye zafaniswa ngokuyisisekelo, futhi ingxenye encane kuphela edinga ukungeniswa kwamanye amazwe. Ngaphezu kwalokho, ngenxa yokuchichima kwezinsiza zezwe lami namanani aphansi ezinto ezibonakalayo, abaxhumanisi abaningi bathunyelwe emazweni angaphandle ngamanani amakhulu, bazuza isithunzi samazwe ngamazwe embonini yezemithi yezwe lami.

Ngokuvamile, abaphakathi kwezemithi bayingxenye ebalulekile yochungechunge lwemboni yezemithi. Ngezakhiwo zabo zamakhemikhali eziyingqayizivele kanye nezinqubo zokukhiqiza, banikeza isisekelo esiqinile sezinto ezibonakalayo sokwenziwa kwezidakamizwa futhi benze iminikelo ebalulekile empilweni yabantu. nikela.