Process for the preparation of cyclic sulfides专利检索-选择性杀虫剂杀虫剂农药农作物保护农用化学品和农药专利检索查询-专利查询网

Process for the preparation of cyclic sulfides

阅读：666发布：2021-01-15

专利汇可以提供Process for the preparation of cyclic sulfides专利检索，专利查询，专利分析的服务。并且High initial selectivities along with good conversions to episulfides are obtained by reacting epoxides in the vapor phase with COS or CS2 in the presence of a solid catalyst selected from the group consisting of calcium and barium oxides, hydroxides and cyanamides and sodium, potassium and lithium hydroxides and sulfides. The highly reactive olefin episulfides formed in accordance with the instant invention, e.g., ethylene episulfide, and propylene episulfide, are active ingredients in various insecticides and fungicides and readily form polymers having useful properties as plastics.，下面是Process for the preparation of cyclic sulfides专利的具体信息内容。

权利要求

2. The process of claim 1 in which the sulfur compound is COS and the reaction temperature is in the range of between about 100* aNd 300*C.

3. The process of claim 1 in which the sulfur compound is CS2 and the reaction temperature is in the range of between about 100* to 300*C.

4. The process of claim 1 in which the catalyst is Ca(OH)2.

5. The process of claim 1 in which the catalyst is mixed sulfides of potassium on Wilson carbon.

6. The process of claim 1 in which the catalyst is NaOH.

7. The process of claim 1 in which the catalyst is soda lime.

8. The process of claim 1 in which the catalyst is calcium cyanamide.

9. A vapor phase process for the selective formation of episulfides which comprises reacting an epoxide with a sulfur compound selected from the group consisting of COS and CS2 at a temperature in the range of from about 100* to 300*C. in the presence of a calcium oxide catalyst and recovering episulfides with a selectivity to episulfides of at least 70 mole percent.

10. The process of claim 9 in which the epoxide is selected from the group consisting of ethylene oxide and propylene oxide.

11. A process for the synthesis of episulfides which comprises reacting an epoxide at a temperature in the range of from about 30* to 400* C. with a sulfur compound selected from the group consisting of COS and CS2 in the vapor state over a catalyst selected from the group consisting of calcium and barium hydroxides and cyanamides and sodium, potassium and lithium hydroxides and sulfides for a period of time in the range of from about 0.1 seconds to 1 hour and recovering a reaction product comprising episulfides.

12. A process for the production of a vicinal episulfide which comprises reacting an alkylene oxide with a sulfur-donor compound selected from the group consisting of carbonyl sulfide, and a carbon disulfide at a temperature in the range of from about 100*C. to about 300*C. in the presence of a catalystic amount of at least one unsupported oxide catalyst selected from the group consisting of calcium oxide and barium oxide, using pressures such that the reaction is carried out at a space velocity in the range of from about 4 to about 600 hours 1, thereby forming a vicinal episulfide corresponding to the alkylene oxide.

13. The process according to claim 12, in which the sulfur-donor is carbonyl sulfide.

14. The process according to claim 12, in which the sulfur-donor is carbon disulfide.

15. The process according to claim 12, in which the reaction occurs in the vapor phase.

16. The process according to claim 12, in which the oxide catalyst is calcium oxide.

17. The process according to claim 12, in which the oxide catalyst is barium oxide.

18. The process according to claim 12, in which the alkylene oxide is ethylene oxide.

19. The process according to claim 12, in which the alkylene oxide is propylene oxide.

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Process for the preparation of cyclic sulfides

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