Process for the oxidation of orthoxylene or naphthalene to phthalic anhydride专利检索-硫代硫酸钾钾化学元素和化合物专利检索查询-专利查询网

Process for the oxidation of orthoxylene or naphthalene to phthalic anhydride

阅读：169发布：2022-09-24

专利汇可以提供Process for the oxidation of orthoxylene or naphthalene to phthalic anhydride专利检索，专利查询，专利分析的服务。并且Oxidation of orthoxylene or naphthalene to phthalic anhydride with a catalyst composed of vanadium oxide, potassium pyrosulfate, and antimony oxide on a titania carrier promoted with amounts of cesium pyrosulfate which may replace some or all of the potassium pyrosulfate. The catalyst can be used either in fluid or fixed bed systems. During reactor operation using this catalyst, it is preferred that, along with an oxygen containing gas such as air, water be added in a concentration of about 3 to 14 moles water per mole of orthoxylene or naphthalene. This addition of water improves the yield of phthalic anhydride.，下面是Process for the oxidation of orthoxylene or naphthalene to phthalic anhydride专利的具体信息内容。

权利要求

2. A process as in claim 1 wherein said oxygen containing gas is air.

3. A process as in claim 2 wherein the mole ratio of oxygen to aromatic hydrocarbon is about 2 to 1 to 12 to 1.

4. A process as in claim 3 wherein said catalyst bed is maintained at a temperature of about 300* to 400*C and a pressure of about 2 to 3 atmospheres.

5. A process as in claim 4 wherein the residence time of said aromatic hydrocarbon in the catalyst bed is about 0.1 to 15 seconds.

6. A process as in claim 3 wherein sulfur dioxide is added to said catalyst bed during feed of said aromatic hydrocarbon in a ratio of about 0.001 to 0.5 moles of sulfur dioxide per mole of aromatic hydrocarbon.

7. A process as in claim 1 wherein said aromatic hydrocarbon is contacted with a mixture of an oxygen containing gas and water vapor in said catalyst bed.

8. A process as in claim 7 wherein said water vapor is present in a concentration of about 3 moles to 14 moles of water per mole of aromatic hydrocarbon.

9. A process as in claim 8 wherein said oxygen containing gas is air.

10. A process as in claim 9 wherein the mode ratio of oxygen to aromatic hydrocarbon is about 2 to 1 to 12 to 1.

11. A process as in claim 10 wherein said catalyst bed is maintained at a temperature of about 300* to 400*C and a pressure of about 2 to 3 atmospheres.

12. A process as in claim 11 wherein the residence time of said aromatic hydrocarbon in the catalyst bed is about 0.1 to 15 seconds.

13. A process as in claim 10 wherein sulfur dioxide is added to said catalyst bed during feed of said aromatic hydrocarbon in a ratio of about 0.001 to 0.5 moles of sulfur dioxide per mole of aromatic hydrocarbon.

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Process for the oxidation of orthoxylene or naphthalene to phthalic anhydride

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