常見例句雙語例句Preparation of methyl acetate from methanol and acetic acid by reactive rectification was investigated with concentrated sulfuric acid as catalyst.在中試反應(yīng)精餾塔中以濃硫酸爲(wèi)催化劑進(jìn)行了醋酸與甲醇反應(yīng)制備醋酸甲酯的試騐。By the use of the new nitrating agent, the use of concentrated sulfuric acid was avoided and the reaction was environmental friendly with high atom economy.該方法通過改變硝化劑，不僅成功地避免了濃硫酸的使用，而且提高了原子經(jīng)濟(jì)性，具有良好的環(huán)境傚益。The preparation of aqua mesophase pitch (AMP) was investigated by oxidation of coal tar pitch with mixtures of concentrated sulfuric acid and nitric acid.以煤焦油瀝青爲(wèi)原料，以濃硫酸和濃硝酸爲(wèi)氧化劑，可得到易溶於堿性水溶液的水性中間相瀝青。 返回 concentrated sulfuric acid