2 4-Difluorobenzoic acid（CAS# 1583-58-0)

Taupānga

Ko te waikawa 2, 4-difluorobenzoic he rongoa nui me te pesticide takawaenga, penei i te 2, 4-difluorobenzoic waikawa te nuinga whakamahia ki te synthesize taero antifungal fluconazole, voriconazole me te tarukino pesticide takawaenga 4-fluorosalicylic waikawa, tarukino takawaenga 3, 5-difluoroaniline, etc 2, 4-difluorobenzoic acid ka taea hoki te whakamahi i te karaihe wai rauemi, he painga o te uara nui me te pai o te maakete.

Whakaritenga

Tāpirihia te 2, 4-dinitrotoluene me te wai ki te ipu tauhohenga, whakatikahia te uara pH ki te 7, whakaohokia me te wera ki te 75°C. Ko te pāhare pāhare pāporo, te konupora pūkawa ngāwha me te whakakōkī whakawhiti wāhanga i tāpirihia i roto i ngā puranga. I muri i te taapiri, haere tonu ki te whakaoho me te tauhohe i te pāmahana tuturu mo te 3 haora. Tātarihia i te wā e wera ana ka horoi i te keke tātari ki te wai wera. Hanumi te filtrate, waikawa ki te 35% waikawa pūmāota ki te pH 2-3, he nui te maha o nga rerenga ma i muri i nga tioata ka tino whakahekehia, ka taraihia, ka horoia, ka whakamarokehia, ka whakamaroke ki te whiwhi tioata ma hei waikawa 2,4-dinitrobenzoic. . Ko te ōwehenga o te 2, 4-dinitrotoluene ki te pāhare pāporo he 2.4:1. Ko te hua hua o tenei taahiraa ko 90.7%.

tāpiri N,N-dimethylmethylphthalamide ki roto i te ipu tauhohenga, whakamahana ki te 100~110 ℃, whakamahana mo te 0.5~1h. Tāpirihia he pāhare pāporo pāhare pāporo maroke i raro i te whakaoho me te pupuri i te pāmahana i mua i te whakamahana mo te 0.5-1h. I muri i tera, ko te 2, 4-dinitrobenzoic acid me te hexyltrimethylammonium bromide i hohoro te whakauru ki te oko urupare i te wa kotahi, a ka haere tonu te whakamahana ki te 120 ℃, ka mau tonu te mahana, ka haere tonu te tauhohenga whakaoho. I muri i te 7 haora o te tauhohenga whakamuri, ka whakahokia mai te whakarewa ma te whakamaarama, katahi ka whakamakuku te wai hohenga ki te mamaoa. Ko te hautau kua kohia he whakaehunga ma. Whai muri i te tu mo te wa roa, ka totohu te hautanga whainga hinu ki raro, ka ringihia te wai maamaa o runga, ka whakamataohia te hinu ki te whakaheke i nga kiripiri ma kia whiwhi hua kino; ka rerystallized te hua masivesivá, momi filtration, horoi, me te whakamaroke ki te whiwhi tioata ma o 2,4-difluorobenzoic waikawa. Ko te ōwehenga o te nui o te waikawa 2, 4-dinitrobenzoic ki te pāhare pāporo pūkōwhai he 2.7:1. Ko te hua hua o tenei taahiraa ko 72.4%.

Kupu Whakataki
Ko te waikawa 2,4-Difluorobenzoic he pūhui waro. E whai ake nei he kupu whakataki mo nga rawa, nga whakamahinga, nga tikanga whakarite me nga korero haumaru o te waikawa 2,4-difluorobenzoic:

Kounga:
- Te ahua: Ko te waikawa 2,4-Difluorobenzoic he totoka tioata ma.
- Wairewa: He wairewa i roto i nga whakarewa waro noa penei i te waihano, te mewaro me te methylene chloride.

Whakamahia:
- Nga rauemi mata: Ka taea hoki te whakamahi hei tetahi o nga rauemi mata mo te whakarite i nga rauemi mata me nga kiriata whakaata.
- Nga tono Ahumahi: Ka taea te whakamahi i te waikawa 2,4-difluorobenzoic i roto i te ahumahi hikohiko, te whakakikorua me te ahumahi kirihou me te anti-corrosion, anti-oxidation me nga paanga anti-ultraviolet.

Tikanga:
- Ka taea te whiwhi waikawa 2,4-Difluorobenzoic ma te fluorination o te waikawa hydrofluoric me te p-methylanisole.

Mōhiohio Haumaru:
- I te wa e mahi ana, me karohia te puehu kia kore e pangia te hau me te pa ki te kanohi. I te wa ano, me mau tonu nga ahuatanga pai o te hau.
- A ape i te pa atu ki nga matū waiora kaha, ki nga waikawa kaha ranei hei karo i nga tauhohenga kino