촉매독으로 작용하는 인화합물과 유황화합물의 첨가에 의해서 수소첨가 반응되었을 때 나타나는 대두유의 물리적 화학적 성질을 규명하고저 하였다. 대두유에 첨가한 인화합물의 양이 증가할수록 oleic acid의 감소와 linoleic acid, stearic acid가 증가되었으며 유황화합물의 함량이 증가할수록 $10.0^{circ}C$와 $21.1^{circ}C$에서의 고체지 함량이 증가하는 반면에 점차로 $33.3^{circ}C$와 $37.8^{circ}C$에서 고체지 함량은 감소하였다. 유황화합물을 첨가하였을 경우에 비하여 인화합물을 첨가한 대두경화유의 융점이 높게 나타났고 유황화합물의 함량이 증가할수록 선택적인 경화조건이 나타났으며 정제공정을 거치면서 대두유에 존재하는 납과 비소는 극미량(0.01 ppm)으로 검출되었다.
The purpose of this study is to determine the physicochemical properties in soybean oil during the hydrogenation by addition of phosphorus compounds and sulfur compounds is increased in soybean oil, decreased oleic acid and increased linoleic acid and stearic acid contents were found. When the sulfur compounds content is increased, solid fat content is increased at $10.0^{circ}C$ and $21.1^{circ}C$ and gradually decreased at $33.3^{circ}C$ and $37.8^{circ}C$. Higher melting point in hydrogenated soybean oil is observed on addition of phosphorus compounds compared to addition of sulfur compounds. When the sulfur compounds content is increased, conditions of selective hydrogenation are observed. Lead and arsenic are detected at a concentration of 0.01 ppm in a few kinds at each step of the refining process of soybean oil.
