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甲醛,無(wú)色有刺激性氣體,化學(xué)式HCHO或CH?O,分子量30.00,又稱(chēng)蟻醛。無(wú)色,對(duì)人眼、鼻等有刺激作用。氣體相對(duì)密度1.067(空氣=1),液體密度0.815g/cm3(-20℃)。熔點(diǎn)-92℃,沸點(diǎn)-19.5℃。易溶于水和乙醇。水溶液的濃度最高可達(dá)55%,通常是40%,稱(chēng)做甲醛水,俗稱(chēng)福爾馬林(formalin)。 具有還原性,尤其是在堿性溶液中,還原能力更強(qiáng)。能燃燒,蒸氣與空氣形成爆炸性混合物,爆炸極限7%-73%(體積)。燃點(diǎn)約300℃。 可由甲醇在銀、銅等金屬催化下脫氫或氧化制得,也可從烴類(lèi)的氧化產(chǎn)物中分出?勺鳛榉尤(shù)脂、脲醛樹(shù)脂、維綸、烏洛托品、季戊四醇、染料、農(nóng)藥和消毒劑等的原料。 工業(yè)甲醛溶液一般含37%甲醛和15%甲醇,作阻聚劑,沸點(diǎn)101℃。 2017年10月27日,世界衛(wèi)生組織國(guó)際癌癥研究機(jī)構(gòu)公布的致癌物清單中,將甲醛放在一類(lèi)致癌物列表中。2019年7月23日,甲醛被列入有毒有害水污染物名錄(第一批)

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