超重力场下乙硫醇钠催化氧化与产物分离研究

Study on catalytic oxidation of sodium ethyl mercaptide and separation of reaction products under high-gravity condition

在超重力场下进行了乙硫醇钠（C2H5NaS）的催化氧化和产物分离研究,考察了反应温度、搅拌转速、气液体积比、碱液质量分数等工艺条件对C2H5 NaS转化率和产物二乙基二硫（C2H5SSC2 H5）分离率的影响.结果表明,在超重力反应器中,C2H5 NaS与氧气的反应过程得到显著强化,可以获得较常规条件下高2～3个量级的反应速率;增大超重力反应器搅拌转速、升高反应温度和降低碱液质量分数,有利于C2H5NaS的转化;加大气液比和提高反应温度有利于C2H5SSC2H5与碱液的分离;在超重力反应器内适宜的反应条件为：反应温度55 ～ 60℃,搅拌转速1 000～1 200 r/min,气液体积比200 ～300,碱液质量分数5％ ～ 10％.

The catalytic oxidation of sodium ethyl mercaptide （C2H5 NaS） and the separation of reaction products were studied in high -gravity field, and the effect of process conditions, such as reaction tempera- ture, stirring speed, ratio of gas to liquid volumetric flow rate and concentration of sodium hydroxide solu- tion （mass fraction） on the conversion of C2HsNaS and the separation rate of diethyl disulfide （C2HsSSCzH5 ） from sodium hydroxide solution was investigated. The results showed that the oxidation re- action rate of sodium ethyl mercaptide was greatly pro- moted by 2 -3 orders of magnitude higher under the high -gravity condition than that under the conven- tional condition. Augmenting the stirring speed of high- gravity reactor, raising the temperature and de-creasing the mass fraction of sodium hydroxide solution were in favor of the oxidation of C2HsNaS. Increasing the ratio of gas to liquid volumetric flow rate and rai- sing the temperature were advantageous to the separa- tion of C2H5SSC2H5 from sodium hydroxide solution. The suitable reaction conditions in the high -gravity reactor were temperature 55 -60 ℃, stirring speed 1 000- 1 200 r/min, ratio of gas to liquid volumetric flow rate 200 -300 and the mass fraction of sodium hy- droxide solution 5% - 10%.