Tirohanga Whānui o te Hua
Ko te Dichloromethane (DCM), ko tōna tauira matū ko CH₂Cl₂, he waikura halogenated kore tae, mārama, he āhua pūngāwerewere, he kakara reka ngawari. Hei whakarewa ahumahi nui, he tūranga motuhake tō te DCM i roto i te hanga me te tukatuka matū nā te kaha o tōna wairewa, te iti o te paitini me te kore e mura (ki te whakatauritea ki ētahi atu waikura chlorine). Ka taea e ia te whakarewa pai i ngā matū rauropi maha pērā i te hinu, te kapia, te rapa me ngā esters cellulose. I taua wā, he tino iti te whakauru ki te wai, ā, he pāmahana kohua ngawari (39.8℃), kia ngāwari ai te whakaora mā te whakatō.
I roto i te hanga ahumahi, ka whakamahia te DCM hei tango peita, hei horoi whakarewa me te pupuhi (hei tauira, mō te hanga pahuka polyurethane). Ka mahi anō hoki hei whakarewa tauhohenga me te tango i roto i te hanganga o ngā rongoā me ngā patupatu, tae atu ki te whakarewa i roto i te hanga kiriata. I tua atu, i whakamahia te DCM mō te tango kawheine i roto i te umanga kai, engari kua tino herea, kua whakakapia rānei tōna whakamahinga i tēnei mara nā runga i ngā tautohetohe haumaru.
Ngā Whanaketanga Ahumahi Hou
Nō nā tata nei, kua aro nui te ao ki ngā kaupapa here ture mō te DCM. I te tīmatanga o te tau 2024, i whakaaro te Tari Matū Pākehā (ECHA) kia whakarārangihia te DCM ki roto i tētahi rārangi here kaha ake i runga i tana aromatawai i ngā mōrearea hauora mahi, ka taea ai e tēnei te whakakaha ake i ngā herenga pānga mahi o te DCM i roto i ngā wāhi ahumahi. Kua aro nui mai ngā kaiwhakamahi Pākehā ki tēnei whanaketanga, e aromatawai ana i ngā utu o ngā otinga rerekē, i ngā mahi whakahaere hangarau kaha ake rānei.
I Haina, kei te whakauru tonu te Manatū Taiao me te Taiao i te DCM ki te rārangi o ngā matū kino kei raro i te whakahaere taiao matua, ā, kei te whakatairanga i te whakaiti i ngā tukunga o ngā Matū Waro Waro (VOC) i te wā e hangaia ana, e whakamahia ana hoki. Kua whakaputa ētahi kāwanatanga ā-rohe i ngā kaupapa here e akiaki ana i te whakaiti, te whakakore rānei i te DCM i ngā mara e wātea ana ngā huarahi kē atu, pērā i te horoi me te tango peita, ā, kua akiaki i ngā umanga e tika ana ki te whakatere i te panonitanga hangarau.
Mō te tukunga mākete, i te haurua tuatahi o te tau 2024, i mua he iti te tukunga DCM o te ao, ā, i piki ake ngā utu i ia wā nā te rerekētanga o te umanga chlor-alkali me te tiaki tipu i ētahi rohe o Āhia. Heoi, me te tukunga āta haere o te kaha whakaputa hou (mai i Haina te nuinga), e matapaetia ana ka neke te tuku me te tono mākete ki te taurite.
Kua puta ake ngā tohu pai i roto i te ao hangarau: kua whakamatautauria a Tiamana ki te whakahaere arumoni i tētahi pūnaha whakaora me te purenga DCM tino whai hua e hangai ana ki ngā rauemi mimiti hou. E kī ana te pūnaha ka whakapiki ake i te tere whakaora DCM mai i te tukanga ahumahi mai i te hau ki te neke atu i te 99% me te hanga anō hei whakarewa tino parakore ka taea te hangarua, ka whakarato i tētahi taputapu hou hei whakaiti i ngā tukunga taiao me ngā utu whakahaere.
Tātari Auahatanga Ahumahi
I te tirohanga whakamua, ka pāngia te umanga DCM e tētahi whenua uaua o te whai i te whanaketanga tauwhiro i raro i ngā ture tino pakari, me ēnei au matua:
He Pakanga Roa i waenganui i te Whakahaere me te Whakawhirinakitanga
I roto i ngā rā kei te heke mai, ka whakapakaritia noa ngā ture hauora me te taiao o te ao mō te DCM, kāore e whakangawaritia. Ko tōna āhua hurihuri, ko tōna paitini roro pea me ōna pānga ki te taiao—ahakoa kāore e kino tika ki te paparanga ozone—ka noho tonu i roto i te tirohanga a ngā kaupapa here taiao. Heoi anō, nā te korenga o ētahi atu huarahi whai hua, whai hua, me te haumaru i roto i ētahi mara motuhake (pēnei i te hanga o ētahi takawaenga rongoā tāpiri nui me te horoi hiko tino tika), ka noho tonu te DCM i raro i tētahi anga whakamahinga kua whakaritea, kaua i te aukati katoa.
Te Whakarerekētanga Tere me te Whakakapinga puta noa i ngā Marae Taupānga
I ngā mara he iti noa ngā paepae hangarau me ngā otinga kē atu kua pakeke, pērā i ētahi tono tango peita me te horoi, ka tere te whakakapi i te wāhi mākete o DCM e ngā kaihoko horoi wai, ngā lactate esters, ētahi atu whakarewa motuhake rānei. Engari, ka noho pūmau te tono mō te DCM kounga teitei, parakore i roto i ngā mara uaua ki te whakakapi pērā i ngā rongoā me te hanga matū kounga teitei. Ko te tipu o te ahumahi ka ahu mai i ēnei rāngai kounga teitei, uara-tāpiri teitei.
Te Whakamahinga ā-Poroiti me te Whakahaere Tukunga hei Mea e Hiahiatia ana kia Ora
Ko te whakamahinga o te DCM ā muri ake nei ka aro nui ki te mahi porowhita kati. Ko te tikanga me haumi ngā umanga e whakaputa ana, e whakamahi ana hoki i te DCM ki ngā taputapu hiri matatau, ngā pūnaha whakaora kohu tino whai hua (hei tauira, te mimiti waro whakahohe, te whakaora hauhautanga) me ngā hangarau maimoatanga pito-o-te-paipa (hei tauira, te waikura whakaterenga) kia tino whakaitihia ai ngā tukunga ki te taumata tino iti. Ka whiwhi ngā umanga e kaha ana ki te whakatutuki i te tohanga ā-roto whai hua me te whakaora anō i te DCM i ngā painga nui e pā ana ki ngā utu tutuki me te pumau o te mekameka tuku.
Te Auahatanga Hangarau e Arotahi ana ki te Haumaru me te Whakaora
Kāore te arotahi o te R&D ahumahi e aro ki te whakawhānui i te kaha whakaputa DCM taketake, engari ki ngā wāhanga matua e toru: 1) Te whakawhanake i ngā whakatakotoranga haumaru ake, pērā i ngā whakaritenga ritenga me te whakaiti i te piki me te heke; 2) Te auaha i ngā hangarau whakaora me te purenga hei whakapai ake i te whai huatanga ōhanga o te whakaora DCM mai i te hau me te wai para matatini; 3) Te tūhura i ngā taputapu tukanga haumaru ake, whai hua ake hoki pērā i ngā microreactors mō te tono DCM i roto i ngā huarahi hanga kore e taea te whakakapi.
Ngā Rerekētanga Kaupapahere ā-Rohe e Hanga Ana i te Tauhokohoko Ao
Mā te rerekētanga o te kaha o ngā ture mō te DCM puta noa i ngā whenua ka rerekē pea te hanga me te whakamahinga ā-rohe. Tērā pea ka kaweake ngā hua mai i ngā rohe he ngoikore ake ngā ture ki ngā rohe kua tino turetia, engari ka tūtaki anō hoki ki ngā arai hokohoko. Ka haere tonu ngā huringa kaupapa here i ngā mākete kaihoko nui o te ao ki te whakararuraru i ngā rere hokohoko o te ao me te pūnaha utu a te DCM.
Te Tūhuratanga Tonu o ngā Huarahi Rēwena Kakariki
I te wā roa, kei te whakapau kaha tonu ngā hapori mātauranga me ngā hapori ahumahi ki te kimi i ngā huarahi kē atu mō te DCM me te mahi ōrite, e whakaaetia ana rānei, engari he iti ake ngā mōrearea taiao me te hauora. Ko te hauhā waro tino hiranga, ngā wai ionic me ngā whakarewa ngota taiao he huarahi rangahau pea ēnei, ahakoa he roa tonu te wā e hokohoko nui ana.
Hei whakarāpopototanga, ko te heke mai o DCM he kōrero mō te whakataurite i ngā mahi kaha me te tipu haere o te kawenga pāpori. E kore e ngaro i te pō kotahi, engari kei te memeha haere tōna mana rangatira. Ka huri te umanga ki tētahi tauira kua whakapaitia ake, kua motuhake ake, ā, kua kati te ara. Mō ngā umanga e tika ana, ko te urutau ki ngā ture pakari ake, te haumi ki ngā hangarau ma, me te tūhura kaha i ngā otinga rerekē mō te wā roa te huarahi anake hei whakatutuki i ngā wero ā-muri. Kei te huri te upoko ahumahi o DCM mai i tētahi wā o te whakamahinga kore here ki tētahi whārangi hou o te whakamahinga kua whakaritea.
Wā tuku: Hanuere-29-2026