옥살산

개요상온에서는 백색의 고체 상태로 존재한다. 189.5°C에서 분해되며 녹는다. 옥살산 이수화물(C2H2O4·2 H2O)은 101.5°C에 녹는다. 산화되기 쉬워서 정량할 때는 묽은 황산 용액에서 과망가니즈산 칼륨으로 산화시키는 방법을 사용한다. 진한 황산과 함께 가열되면 같은 부피의 일산화 탄소와 이산화 탄소를 생성한다.

용도표백제의 주 성분이며, 포도당과 물엿을 만들 때 쓰이기도 한다. 또한 강한 환원제라 녹 제거나 희토류 추출용으로도 쓴다.

용도Oxalic acid was used: · in the synthesis of hemicellulose hydrolysates of yellow poplars; · in the synthesis of three-dimensionally ordered macroporous metal oxides or carbonates via templating with polystyrene spheres; · as supporting electrolyte in the electrochemical synthesis of polyaniline-polypyrrole composite coatings.

일반 설명Odorless white solid. Sinks and mixes with water.

생산 방법Many industrial processes have been employed for the manufacture of oxalic acid since it was first synthesized. The following processes are in use worldwide: oxidation of carbohydrates, the ethylene glycol process, the propylene process, the dialkyl oxalate process, and the sodium formate process. Sodium formate process is no longer economical in the leading industrial countries, except for China. Nitric acid oxidation is used where carbohydrates, ethylene glycol, and propylene are the starting materials. The dialkyl oxalate process is the newest, where dialkyl oxalate is synthesized from carbon monoxide and alcohol, then hydrolyzed to oxalic acid. This process has been developed by UBE Industries in Japan.Many attempts have been made to synthesize oxalic acid by electrochemical reduction of carbon dioxide in either aqueous or nonaqueous electrolytes.