ʻO Dimethyl Carbonate (DMC): He Mea Koʻikoʻi Haʻahaʻa-Toxicity, Kiʻekiʻe-Efficiency no ka Kemika Hoʻomau
Nā Waiwai Physicochemical a me nā ʻIke Molekala
Nā Pōmaikaʻi Kūkulu
ʻAʻohe ʻawahia: Me ka LD₅₀ (waha, ʻiole) o 6400 mg/kg, ʻoi aku ka palekana o ka DMC ma mua o nā mea hana methylation kuʻuna (e laʻa, dimethyl sulfate, LD₅₀ = 140 mg/kg), e kūlike ana me ke kānāwai EU REACH ma nā mea haumia organik paʻa ʻole.
Ka hana hou ʻana:
Methylation: ʻO ka hui methoxy (−OCH3) e hiki ai ke hoʻoili palekana i ka hui methyl, e pani ana i nā koho ʻawahia.
Carbonylation: Hoʻomaʻamaʻa ka hui carbonyl (−CO−) i ka hoʻololi ester a me ka aminolysis, e kākoʻo ana i ka synthesis phosgene-free o polycarbonates.
Ka Hoʻokahe Waiwai: Me kahi paʻa dielectric o 3.1, hui maikaʻi ʻo DMC me nā alcohols, ketones, a me nā esters, ʻoiai e hoʻoheheʻe hapa ʻia i ka wai (1.6 g/100 mL ma 20°C).
ʻIkepili Kino Koʻikoʻi
ʻO ke kiko paila o DMC he 90.5°C e kūpono ai no nā hopena wela waena a me ka hoʻōla ʻana o ka solvent, e koi ana i ka ikehu 30% emi ma mua o nā kaʻina hana benzene. ʻO kona viscosity haʻahaʻa (0.664 mPa・s) e hoʻonui i ke kahe ʻana i nā noi e like me nā electrolytes pākahiko lithium, ʻoiai ʻo ka enthalpy vaporization o 363 kJ/kg e hōʻoiaʻiʻo ana i nā helu maloʻo kaulike no nā uhi a me nā mea hoʻopili. Nānā: ʻO kona pae pahū (3.1–20.5% vol) e pono ai nā ʻōnaehana ea 防爆 (pahū-pahū).
Nā Hoʻohana ʻOihana like ʻole
Nā Hana Hou Hoʻohui ʻŌmaʻomaʻo
Hana ʻana o ka Polycarbonate (PC):
Kaʻina Hana ʻAʻohe Phosgene: Hoʻopili ʻo DMC me ka bisphenol A (BPA) ma o ka transesterification e hana i ka diphenyl carbonate (DPC), a laila polymerized i loko o PC. Hoʻonui kēia ʻano hana i ka pono o ka atom i 92% (vs. 65% no nā ala phosgene kuʻuna) a hoʻopau i nā huahana ʻawahia.
Hana Huahana: Hāʻawi nā resins PC i loaʻa i ka ≥90% o ka hoʻoili mālamalama, kahi mahana hoʻopilikia wela o 135°C, a me ka ikaika hopena 10% kiʻekiʻe ma mua o ka PC i loaʻa mai ka phosgene, i hoʻohana ʻia i loko o nā pahu uila a me nā uhi kukui poʻo kaʻa.
Nā lāʻau lapaʻau a me nā Agrochemicals:
Nā Hana Methylation: Hoʻololi i ka dimethyl sulfate i ka hana ʻana i nā lāʻau cardiovascular (e like me ka nifedipine) a me nā antidepressants (e like me ka sertraline), e hoʻomaikaʻi ana i ka hua ma 15-20% me ka methanol ma ke ʻano he huahana ʻaoʻao wale nō.
Nā Hana Carbonylation: Hoʻohana ʻia i ka hana carbaryl (pesticide) e pale aku i ka HCl corrosion, e hōʻemi ana i nā kumukūʻai ma 25%.
Ikehu Hou a me nā Mea Hana
Nā Electrolytes o ka Pākahiko Lithium:
I hui pū ʻia me ka ethylene carbonate (EC) a me ka ethyl methyl carbonate (EMC), hana ʻo DMC i nā electrolytes kaulike me ka ionic conductivity a hiki i ka 1.2 mS/cm. Hoʻolōʻihi kēia i ke ola o ka pōʻaiapuni pila i 1,200 mau manawa (paʻa mana ≥85%), e hoʻokō ana i ka EU Battery Regulation (2023/0051) no ka haʻahaʻa haʻahaʻa. Ua hoʻohana mua ʻia i ka hana ʻana o nā pila 4680 a Tesla.
Nā Mea Palaho Olaola:
I hoʻohuihui ʻia me ka propylene oxide e hana i ka polypropylene carbonate (PPC), hoʻopili nā mea i hoʻokumu ʻia i ka DMC i ka 40% CO₂ a palaho i loko o 6-12 mau mahina, e hoʻoponopono ana i nā ʻōpala palaki i nā kīʻaha hoʻokahi hoʻohana a me nā ʻili mahiʻai.
Nā Uhi a me nā Mea Hoʻopili
Nā Mea Hoʻoheheʻe Aloha Kaiapuni: Hoʻololi i ka toluene/xylene i nā pena OEM kaʻa, e hoʻokō ana i ka nui o ka VOC ≤50 g/L (ma lalo loa o nā kūlana GB 24409-2020). Ua hoʻemi ʻia ka manawa maloʻo i 2 mau hola, me ka paʻakikī o ka ʻili e hiki ana i ka 2H.
Nā Mea Hoʻopili ʻAʻohe Formaldehyde: Hoʻohana ʻia i ka hoʻopili ʻana i nā panela lako, loaʻa i nā mea hoʻopili polyurethane DMC ka formaldehyde manuahi ≤0.01 mg/m³ (E0 grade), e kōkua ana iā IKEA e hōʻemi i ka hoʻokuʻu ʻana o ka formaldehyde ma 500+ tons i kēlā me kēia makahiki.
Nā Pōmaikaʻi Kaiapuni a me nā Pilikia ʻenehana
Nā mea koʻikoʻi o ka hoʻomau ʻana
Hoʻokele Waiwai ʻAtomika: Hiki ke hana hou ʻia nā huahana e like me ka methanol ma o ka distillation, e hōʻemi ana i ka ukana COD i loko o ka wai hoʻoneoneo ma 70% ke hoʻohālikelike ʻia me nā kaʻina hana kuʻuna.
Hopu Kalapona: Hoʻemi ka synthesis PC non-phosgene i ka kapuaʻi kalapona ma 45%, ʻoiai ʻo kēlā me kēia tona o DMC i hana ʻia e hoʻopau i 0.6 tons o CO₂ mai ke kinoea flue o ka hale hana mana, e kākoʻo ana i ka CCU (hopu kalapona a me ka hoʻohana ʻana).
Nā Palena Hoʻokumu Hou
Hoʻemi Kumukūʻai: ʻO ke ʻano hana synthesis pololei CO₂ (me ka hoʻohana ʻana i ka methanol, CO₂, a me nā mea hoʻouluulu Pd) e hōʻemi i nā kumukūʻai mea maka ma 30%, me ka hale hana hoʻāʻo o Sinopec e hoʻokō ana i ka hana ʻana i ka unahi kiloton.
Nā Hoʻonā Maʻemaʻe Loa: Hoʻokō ka ʻenehana hoʻokaʻawale-adsorption membrane i ka DMC papa uila me nā ion metala ≤1 ppb a me ka maʻemaʻe ≥99.999%, e hoʻokō ana i nā kūlana SEMI C87 no ka hoʻomaʻemaʻe semiconductor.
Logistics Palekana: Hoʻokiʻekiʻe ka Microencapsulated DMC (i uhi ʻia i loko o nā nanoshells SiO₂) i ka flash point i 60°C, i hōʻoia ʻia e TÜV Rheinland no ka palekana o ka halihali.
Nā kikoʻī
| Inoa Huahana | ʻAkika Propionic | |||||||||
| Formula Kemika | C3H6O2 | |||||||||
| Kaumaha Molekala | 74.08 g/mol | |||||||||
| helehelena | Wai moakāka ʻole kala | |||||||||
| Kiko Heheʻe | -20.8℃ | |||||||||
| Kikowaena paila | 141.1℃ | |||||||||
| Ka nui o ka paʻa | 0.993 g/cm³ | |||||||||
| Helu Kūʻai | 79 - 09 - 4 | |||||||||
| Kaʻina HS | 29155000 | |||||||||
| ʻAʻohe EINECS | 201 - 176 - 3 | |||||||||
| Noi | Hoʻopili ʻia i loko o nā plastics, pharma, meaʻai, nā mea hoʻoheheʻe a me nā mea ʻala | |||||||||
Palapala Mana Kūlana
| Inoa Huahana | ʻAkika Propionic | ||||||
| MEA | KA WAIWAI MAʻAMAU（%） | KA WAIWAI HOʻĀʻO（%） | |||||
| Ka nui o ka waikawa Propionic, w/%≥ | 99.5 | 99.9 | |||||
| Ka nui (20/20 ℃) | 0.993-0.997 | 0.996 | |||||
| Pae paila/℃ | 138.5-142.5 | 139.4-141.1 | |||||
| Koena mahu, w/% ≤ | 0.01 | 0.006 | |||||
| Wai, w/% ≤ | 0.15 | 0.02 | |||||
| ʻAldehyde,w/%≤ | ≤0.05 | 0.04 | |||||
| ka hoʻomakeʻe maʻalahi, w/% ≤ | ≤0.05 | 0.01 | |||||
| Pb mg/kg≤ | 2.0 | ≤2.0 | |||||
| E like me mg/kg≤ | 3.0 | ≤3.0 | |||||
| Hopena | E kūlike me nā kūlana o GB 1886.210-2016 | ||||||
No ke aha e koho ai i kā mākou DMC?
ʻEhā mau ikaika koʻikoʻi
Hōʻoiaʻiʻo Maʻemaʻe:
ʻO kā mākou hana transesterification hoʻomau me ka distillation triple e hāʻawi i ka DMC papa ʻoihana (≥99.5%) a me ka papa uila (≥99.99%), me ka methanol ≤100 ppm. Hihia: Ua loaʻa i kahi mea kūʻai aku pākahiko e hoʻohana ana i kā mākou DMC he 98.7% ka pono o ka hoʻouka mua ʻana (ʻawelike ʻoihana 95%).
Ka Mana Hoʻopilikino:
Nā hopena i hana kūikawā ʻia no ka waiwai waikawa (≤0.001 mgKOH/g), ka makū (≤50 ppm), a me nā peroxides (≤5 ppm). No ka laʻana, ua hoʻomohala mākou i ka DMC waikawa haʻahaʻa loa (0.0005 mgKOH/g) no ka hana lāʻau lapaʻau i pili i ka waikawa.
Ke Kumu Hoʻohālike Hoʻokele Waiwai Pōʻai:
Hoʻopōʻaiapuni ʻia nā huahana methanol i loko o nā syngas (CO+H₂) no ka hana ʻana o DMC, e hoʻokō ana i ka 95% o ka pono o nā mea a me ka hoʻēmi ʻana i nā hoʻokuʻu CO₂ e 3 tons no kēlā me kēia tons o DMC. Hoʻomaʻemaʻe ʻia nā ʻōpala ma o ka supercritical CO₂ no ka hoʻohana hou ʻana he 95%.
Hoʻokō Honua:
Kūlike me GB/T 1628-2020, ASTM D7056, a me JIS K 1551. Hoʻokō nā lepili GHS i hana ʻia a me MSDS i nā koi kūloko (e laʻa, India BIS, Brazil INMETRO), e hiki ai ke hoʻokuʻu ʻia i loko o 72 hola.
Ke Kemika Hoʻomau Paionia
Ke hoʻololi hou nei ʻo Dimethyl Carbonate i nā ʻoihana ma o kona mau ʻano "ʻaʻohe ʻawahia, kūpono, a hiki ke hana hou ʻia". Kūpaʻa mākou i nā kaʻina hana hou a me nā hoʻonā haʻahaʻa kalapona, e hāʻawi ana i ke kākoʻo āpau mai nā mea maka a hiki i nā noi. ʻO ke koho ʻana i kā mākou DMC ʻo ia hoʻi ka hui pū ʻana me ke kūpaʻa—kahi e hoʻoikaika ai kēlā me kēia kulu i ka hōʻemi ʻana i ka haumia, ka pono o ka ikehu, a me ka holomua ʻenehana, e kūkulu pū ana i kahi wā e hiki mai ana me nā kemika ʻōmaʻomaʻo.