Pfupiso yeChigadzirwa
Dichloromethane (DCM), ine fomura yemakemikari CH₂Cl₂, ihydrocarbon isina ruvara, inoonekera, inoshanduka-shanduka ine hwema hunotapira hushoma. Semunyungudutsi unokosha weindasitiri, DCM ine chinzvimbo chakasiyana mukugadzirwa kwemakemikari nekugadzirwa kwayo nekuda kwekusimba kwayo, chepfu shoma uye kusabvira (kana tichienzanisa nedzimwe chlorine hydrocarbons). Inogona kunyungudutsa zvinobudirira zvinhu zvakasiyana-siyana zvakaita semafuta, resins, rabha uye cellulose esters. Panguva iyi, ine kusawirirana kwakaderera nemvura uye inofashaira zvishoma (39.8℃), zvichiita kuti zvive nyore kuiwana nekuinyudza.
Mukugadzirwa kwemaindasitiri, DCM inonyanya kushandiswa semushonga wekubvisa pendi, mushonga wekuchenesa simbi uye mushonga wekuputira (semuenzaniso, kugadzira furo repolyurethane). Inoshandawo semushonga wekugadzirisa uye wekuburitsa mishonga mukugadzirwa kwemishonga nemishonga yezvipembenene, pamwe chete nemushonga wekugadzirisa makemikari mukugadzira mafirimu. Pamusoro pezvo, DCM yaimboshandiswa mukubvisa caffeine muindasitiri yechikafu, asi kushandiswa kwayo munzvimbo iyi kwakaganhurirwa zvakanyanya kana kutsiviwa nekuda kwemakakatanwa ekuchengetedza.
Zvitsva zveIndasitiri
Munguva pfupi yapfuura, mitemo yekutonga pamusoro peDCM yave chinhu chinonyanya kutariswa pasi rose. Pakutanga kwa2024, European Chemicals Agency (ECHA) yakaronga kuisa DCM muchirongwa chezvirambidzo zvakasimba zvichibva pakuongorora kwayo njodzi dzehutano hwebasa, izvo zvinogona kuwedzera kusimbaradza miganhu yekusangana neDCM pabasa munzvimbo dzemaindasitiri. Kufambira mberi uku kwakakwezva kutariswa kukuru kubva kune vashandisi vekuEurope vari pasi, vari kuongorora mitengo yemhinduro dzakasiyana kana matanho ekudzora einjiniya akaomarara.
MuChina, Bazi reEcology neEnvironment rakaramba richiisa DCM pane runyorwa rwemakemikari ane njodzi ari pasi pekuchengetedzwa kukuru kwezvakatipoteredza, uye riri kukurudzira kudzikiswa kwemhepo inoburitsa zvinhu zvinosvibisa (Volatile Organic Compounds (VOCs)) panguva yekugadzirwa kwayo nekushandiswa kwayo. Dzimwe hurumende dzemuno dzakaburitsa mitemo inokurudzira kudzikiswa kana kubviswa kweDCM munzvimbo dzine dzimwe nzira dzinogoneka, dzakadai sekuchenesa nekubvisa pendi, izvo zvakakurudzira makambani akakodzera kuti akurumidze kushandura tekinoroji.
Panyaya yekuwanikwa kwemakemikari mumusika, muhafu yekutanga yegore ra2024, kuwanikwa kwemakemikari pasi rose eDCM kwaimbove kwakaderera uye mitengo yaikwira nguva nenguva nekuda kwekuchinja-chinja kweindasitiri yechlor-alkali yepamusoro uye kugadziriswa kwemiti mune dzimwe nzvimbo dzeAsia. Zvisinei, nekuburitswa zvishoma nezvishoma kwesimba idzva rekugadzira (kunyanya kubva kuChina), kuwanikwa kwemakemikari mumusika uye kudiwa kwawo kunotarisirwa kuti kuenderane.
Zviratidzo zvakanaka zvakabuda mumunda wehunyanzvi: sisitimu yekuchenesa nekushandisa DCM inoshanda zvakanyanya yakavakirwa pazvinhu zvitsva zvinonyungudutsa mvura yakaiswa mukuyedzwa kwekushanda kwebhizinesi muGermany. Sisitimu iyi inoti inokwidza mwero wekudzoka kweDCM kubva muindasitiri kubva pagasi kusvika pamusoro pe99% uye inoigadzirazve kuita solvent inodzokororwa, ichipa chishandiso chitsva chekuderedza kusvibiswa kwezvakatipoteredza uye mari yekushanda.
Kuongorora Maitiro Eindasitiri
Tichitarisa mberi, indasitiri yeDCM ichasangana nemamiriro ezvinhu akaomarara ekutsvaga budiriro inochengetedza nharaunda pasi pemitemo yakasimba, nemafambiro makuru anotevera:
Kurwisana Kwenguva Refu Pakati Pemitemo Nekuvimbika
Mune ramangwana rinoonekwa, mitemo yehutano hwepasi rose nezvezvakatipoteredza paDCM ichasimbiswa chete, kwete kudzoreredzwa. Kusagadzikana kwayo, kukuvadza kwetsinga dzeuropi uye kukanganisa kwayo nharaunda—kunyange zvazvo isingakuvadzi zvakananga ozone layer—zvichaita kuti irambe ichitariswa nemutemo wezvakatipoteredza. Kunyange zvakadaro, nekuda kwekushaikwa kwenguva pfupi kwemamwe mashandisirwo asingadhuri, anoshanda zvakanaka uye akachengeteka mune mamwe matunhu chaiwo (akadai sekugadzirwa kwemishonga yepamusoro-soro uye kuchenesa kwemagetsi kwakanyatsogadzirwa), DCM icharamba iripo pasi pehurongwa hwekushandiswa kwakarongwa pane kurambidzwa zvachose.
Kukurumidzisa Kusiyanisa uye Kutsiva Muminda Yekushandisa
Muminda ine miganho yakaderera yehunyanzvi uye dzimwe nzira dzekugadzirisa dzakakura, dzakadai sekubvisa pendi nekuchenesa, chikamu chemusika cheDCM chichatsiviwa nekukurumidza nemishonga yekuchenesa inobva mumvura, lactate esters kana zvimwe zvinonyungudutsa zvine hunyanzvi. Kusiyana neizvi, kudiwa kweDCM yakachena uye yemhando yepamusoro kucharamba kwakasimba muminda yakaoma kutsiva yakadai semishonga uye kugadzira makemikari emhando yepamusoro. Kukura kweindasitiri kuchabva muzvikamu izvi zvepamusoro-soro, zvine kukosha kwakanyanya.
Kushandiswa kweLoop Yakavharika uye Kudzora Kubuda Kwemhepo Sechinodiwa Chekurarama
Kushandiswa kweDCM mune ramangwana kuchawedzera kukoshesa mashandiro e "closed-loop". Izvi zvinoreva kuti makambani anogadzira nekushandisa DCM anofanira kuisa mari mumidziyo yepamusoro yakavharwa, masisitimu ekudzoreredza utsi anoshanda zvakanyanya (semuenzaniso, activated carbon adsorption, condensation recovery) uye matekinoroji ekugadzirisa ekupedzisira kwepombi (semuenzaniso, catalytic oxidation) kuona kuti utsi hunodzikiswa kusvika padanho rakaderera zvakanyanya. Makambani anokwanisa kuwana kutenderera kwemukati kwakanaka uye kuvandudzwa kweDCM achawana mabhenefiti makuru maererano nemitengo yekutevedzera mitemo uye kugadzikana kwecheni yekugovera.
Kuvandudzwa Kwetekinoroji Kwakatarisana Nekuchengetedza Uye Kupora
Chinangwa chekuongorora nekuvandudza indasitiri hachichazove kuwedzera kugona kwekugadzira DCM, asi panzvimbo pezvinhu zvitatu zvakakosha: 1) Kugadzira mafomura akachengeteka, akadai sekugadzirira kwakagadzirirwa pasina kugadzikana kwakanyanya; 2) Kugadzira matekinoroji ekugadzirisa nekuchenesa kuti pave nekushanda zvakanaka kweDCM kubva mumvura yakaoma isina gasi nemvura yakasviba; 3) Kutsvaga michina yakachengeteka uye inoshanda zvakanyanya senge microreactors yekushandisa DCM munzira dzisingatsiviwe dzekugadzira.
Kusiyana kweMitemo yeDunhu Kunoumba Kutengeserana Kwepasirose
Kuchinja-chinja kwesimba remutemo paDCM munyika dzakasiyana-siyana kunogona kukonzera musiyano mukugadzirwa nekushandiswa kwenzvimbo. Zvigadzirwa zvinobva munzvimbo dzine mitemo yakareruka zvinogona kutumirwa kune dzine mitemo yakanyatsorongeka, asi panguva imwe chete zvinosangana nezvipingamupinyi zvekutengeserana. Kuchinja kwemitemo mumisika mikuru yevatengi pasi rose kucharamba kuchikanganisa kufamba kwekutengeserana kwenyika dzeDCM uye hurongwa hwemitengo.
Kutsvaga Zvitsva Zvisina Kunaka Kwenzvimbo Dzakasvibira
Mukufamba kwenguva, nharaunda dzedzidzo nedzemaindasitiri dziri kuedza nepese padzinogona napo kutsvaga dzimwe nzira dzeDCM dzine mashandiro akaenzana kana anogamuchirwa asi njodzi dzezvakatipoteredza nedzehutano dziri pasi. Supercritical carbon dioxide, ionic liquids uye solvents yakagadzirwa nezvakatipoteredza zvese zvinogona kutsvagwa, kunyangwe kutengeserana kwazvo kuchitora nguva.
Muchidimbu, ramangwana reDCM inyaya yekuenzanisa mashandiro ane simba nekukura kwemutoro wevanhu. Harizonyangarike kamwe chete, asi chinzvimbo charo chepfuma chiri kuparadzwa. Indasitiri iyi ichashanduka kuita modhi yakanatswa, yakasarudzika uye yakavharwa. Kune makambani akakodzera, kugadzirisa mitemo yakaoma, kuisa mari mumatekinoroji akachena uye kutsvaga mhinduro dzenguva refu ndiyo chete nzira yekusangana nematambudziko emangwana. Chikamu chemaindasitiri cheDCM chiri kuchinja kubva munguva yekushandiswa kusingadzoreki kuenda papeji idzva rekushandiswa kwakadzorwa.
Nguva yekutumira: Ndira-29-2026