二氧化硫脲的合成工艺研究

化工论文编号:HG046  论文字数:14358,页数:33，附开题报告，任务书，实习报告，外文翻译，答辩PPT

目 录
摘 要 I
ABSTRACT II
1 文献综述 1
1.1 概述 1
1.2 国内外研究动态和水平 4
1.2.4连续法 7
1.3 二氧化硫脲合成路线 8
1.4本文的研究目的、意义和主要内容 9
2 实验部分 11
2.1实验仪器与试剂 11
2.2合成路线和步骤 11
2.2.1 合成路线 11
2.2.2实验步骤 11
2.3实验结果与讨论 12
2.4 工艺条件的优化 21
3 实验结论 25
致 谢 26
参 考 文 献 27

摘 要
 二氧化硫脲是一种新型的高效还原剂，稳定性好，还原电位高，不易分解和自燃，运输、储存、使用安全方便。而一直普遍应用于印染和漂白工业的保险粉容易分解和自燃，使用过程中存在安全隐患，因此在国外已经将二氧化硫脲用作保险粉的代用品广泛应用于印染工业、漂白工业、制药、有机合成及分析、造纸、高分子和照相感光材料工业等领域。
 以硫脲和双氧水为原料，经过一步反应合成二氧化硫脲。目标产物最佳合成条件为：n(双氧水):n（二氧化硫脲）=2.15:1，反应时间75min，反应温度0℃～2℃，溶剂用50%乙醇-水混合溶液，陈化时间75min， 2%促进剂丙酮，3%pH稳定剂碳酸氢铵。目标产物的收率为91.32%。用傅立叶变换红外光谱、1HNMR、13CNMR对目标产物进行了结构表征，结果显示，目标产物就是二氧化硫脲。

关健词：硫脲，双氧水，碳酸氢铵，丙酮，二氧化硫脲

Study on the Synthesis of Thiourea Dioxide
ABSTRACT
 Thiourea dioxide(TD),as a novel reductant, has good stability and high redox potential,
and will not be spontaneous decomposed. It is very convenience and safety for transportation,
storage and utilization. Meanwhile, rongalite, which is widely used in dyeing and blenching industry, is easily decomposed and self-ignited, then cause some potential safety problems.
Hence, in foreign countries, TD has been widely used in various fields as the substitute of rongalite, such as printing and dyeing industry, bleaching industry, pHarmaceutical industry,
organic synthesis and analysis, paper making industry, polymer industry, and pHotosensitive material industry and so on.
 Thiourea dioxide was synthesized by thiourea and hydrogen peroxide, sulfur dioxide by one step reaction of urea. Optimal conditions for the target product were: n (hydrogen peroxide): n (thiourea dioxide) = 2.15:1, reaction time was 75min, reaction temperature was 0 ℃ ~ 2 ℃, the solvent is a mixture of 50%water and 50%alcohol, crystallization time was 75min, the amount accelerant of acetone was 2%, the amount pH stabilizer of ammonium bicarbonate was 3%. Ratio of translation can reach at 91.32%. Fourier transform infrared spectroscopy, 1HNMR, 13CNMR of the target product was characterized, The results showed that the target product was thiourea dioxide.
KEY WORDS：thiourea, hydrogen peroxide, ammonium bicarbonate, acetone, thiourea dioxide