ABSTRACT

Changes in the dielectric properties of benzene mercaptan, benzene sulfide, and dibenzothiophene at 915 MHz frequency within 20 °C–100°C was studied for the first time. Coal-like substances were prepared by loading the compounds onto low-sulfur coal, and desulfurization test was performed under the microwave condition of 915 MHz and microwave – HCOOH–H₂O₂ system. The desulfurization reaction path and mechanism were summarized, and the relationship between the dielectric properties of organic sulfur and desulfurization efficiency was established. Results showed that the microwave-absorption ability of dibenzothiophene was weaker than that of benzene mercaptan and phenyl sulfide, and its dielectric properties changed irregularly with temperature. Dibenzothiophene cannot be removed by microwave radiation. Benzene mercaptan and phenyl sulfide had the highest efficiency of absorbing microwave energy and converting it into heat energy at 60°C. Moreover, they have the highest microwave desulfurization rate of up to 14%. In the microwave – HCOOH–H₂O₂ oxidation system, the highest desulfurization rates of phenyl sulfide occurred at 100°C because water-soluble products (such as sulfonate and sulfate) increased in the oxidation products. However, phenyl sulfide still had the highest desulfurization efficiency at 60°C. The desulfurization rates at 60°C and 100°C were 38% and 51%, respectively.

摘要

首次研究了苯硫醇、苯硫醚和二苯并噻吩在915 MHz频率下20℃~100℃范围内介电性能的变化。将这些化合物负载到低硫煤上制备煤状物质，并在915 MHz微波条件和微波-HCOOH–H ₂ O _{2下进行脱硫试验。}系统。总结了脱硫反应路径和机理，建立了有机硫介电性能与脱硫效率之间的关系。结果表明，二苯并噻吩的微波吸收能力弱于苯硫醇和苯硫醚，且其介电性能随温度变化无规律。二苯并噻吩不能通过微波辐射去除。苯硫醇和苯硫醚在60℃时吸收微波能并将其转化为热能的效率最高。而且微波脱硫率最高可达14%。在微波炉中 – HCOOH–H ₂ O ₂在氧化系统中，苯硫醚的脱硫率最高出现在100℃，因为氧化产物中水溶性产物（如磺酸盐和硫酸盐）增加。但苯硫醚在60℃时仍具有最高的脱硫效率。60℃和100℃时的脱硫率分别为38%和51%。