公开(公告)号：US07157071B2

公开(公告)日：2007-01-02

申请号：US10879501

申请日：2004-06-30

Applicant: Vasant Ramchandra Choudhary ,  Chanchal Samanta ,  Prabhas Jana

Inventor： Vasant Ramchandra Choudhary ,  Chanchal Samanta ,  Prabhas Jana

IPC: C01B15/01

CPC classification number: C01B15/01

Abstract: The present invention discloses a process for the production of hydrogen peroxide from hydrazine hydrate or hydrazine salt, represented by a general formula: N2H4.nX, wherein, X is H2O, H2SO4, HNO3, HCl, HBr, HI or CH3COOH; n is 0.5, 1 or 2; N is nitrogen; H is hydrogen; S is sulfur; Cl is chlorine; Br is bromine; and I is iodine, by its liquid phase oxidation with oxygen, using a solid catalyst comprising palladium but with or without halogen promoter, in an aqueous reaction medium with or without comprising a mineral acid and/or halide anions, which comprises: i) contacting the solid catalyst with a hydrazine hydrate or hydrazine salt and oxygen containing gas selected from oxygen, air and oxygen enriched air, in aqueous reaction medium at the following reaction conditions: the concentration of hydrazine hydrate or hydrazine salt in the reaction medium above 0.001 mol/dm3, the concentration of mineral acid in the reaction medium in the range from zero mol/dm3 to 10 mol/dm3, the concentration of halide anions added to the reaction medium in the range from zero mmol/dm3 to 100 mmol/dm3, the concentration of the solid catalyst in the reaction medium in the range from 0.01 g/dm3 to 100 g/dm3, the space velocity of the oxygen containing gas in the range from 100 cm3/g catalyst/h to 100,000 cm3/g catalyst/h, the mass ratio of hydrazine hydrate or hydrazine salt to solid catalyst in the range from 0.01 to 100, the temperature below 100° C., the pressure at least 0.95 atm, and the reaction contact time above 0.02 h; and ii) separating the H2O2 from the reaction mixture.

公开(公告)号：US07288240B2

公开(公告)日：2007-10-30

申请号：US11167573

申请日：2005-06-27

Applicant: Vasant Ramchandra Choudhary ,  Chancal Samanta ,  Prabhas Jana

Inventor： Vasant Ramchandra Choudhary ,  Chancal Samanta ,  Prabhas Jana

IPC: C01B15/029 ,  B01J27/13

CPC classification number: C01B15/029

Abstract: A method for improving drastically both the selectivity and yield of hydrogen peroxide in the direct oxidation of hydrogen to hydrogen peroxide over a solid catalyst comprising palladium, which comprises: i) depositing on the solid catalyst at least two halogen containing compounds, one compound essentially comprising bromine and second compound essentially comprising fluorine with the bromine to palladium and fluorine to palladium atom ratios in the range from 0.02 to 20 and from 0.01 to 50, respectively; ii) decomposing the halo compounds deposited on the solid catalyst by calcination at a temperature above 200° C. under inert, reducing or oxidizing gas atmosphere or under vacuum; and iii) contacting the solid catalyst obtained from step (ii) with a gas mixture consisting of hydrogen and oxygen or air or O2 enriched air in an aqueous reaction medium, comprising a mineral acid at the following reaction conditions: concentration of mineral acid in the reaction medium above 0.001 mol/dm3, concentration of the solid catalyst in the reaction medium above 0.01 g/dm3, H2/O2 mole ratio in the gas mixture in the range from 0.01 to 10, flow rate of the gas mixture in the range from 50 cm3/g catalyst/h to 50,000 cm3/g catalyst/h, gas pressure at least 0.9 atm, and temperature below 100° C. and contact period of the reaction medium at least 0.01 h, is disclosed.

Abstract translation: 一种用于在包含钯的固体催化剂中将氢气直接氧化成过氧化氢的过氧化氢的选择性和产率大大提高的方法，其包括：i）在固体催化剂上沉积至少两种含卤素的化合物，一种化合物基本上包含 溴和第二化合物，其主要包含氟，溴与钯和氟与钯的比例分别为0.02至20和0.01至50; ii）通过在惰性，还原或氧化气体气氛或真空下在高于200℃的温度下煅烧来分解沉积在固体催化剂上的卤代化合物; 和iii）将由步骤（ii）获得的固体催化剂与由氢气和氧气组成的气体混合物或空气或富含O 2的空气在含水反应介质中接触，所述反应介质在下列反应中包含无机酸 条件：反应介质中无机酸的浓度高于0.001mol / dm 3，反应介质中的固体催化剂浓度高于0.01g / dm 3，H

公开(公告)号：US20060002846A1

公开(公告)日：2006-01-05

申请号：US10879501

申请日：2004-06-30

Applicant: Vasant Choudhary ,  Chanchal Samanta ,  Prabhas Jana

Inventor： Vasant Choudhary ,  Chanchal Samanta ,  Prabhas Jana

IPC: C01B15/01

CPC classification number: C01B15/01

Abstract: The present invention discloses a process for the production of hydrogen peroxide from hydrazine hydrate or hydrazine salt, represented by a general formula: N2H4.nX, wherein, X is H2O, H2SO4, HNO3, HCl, HBr, HI or CH3COOH; n is 0.5, 1 or 2; N is nitrogen; H is hydrogen; S is sulfur; Cl is chlorine; Br is bromine; and I is iodine, by its liquid phase oxidation with oxygen, using a solid catalyst comprising palladium but with or without halogen promoter, in an aqueous reaction medium with or without comprising a mineral acid and/or halide anions, which comprises: i) contacting the solid catalyst with a hydrazine hydrate or hydrazine salt and oxygen containing gas selected from oxygen, air and oxygen enriched air, in aqueous reaction medium at the following reaction conditions: the concentration of hydrazine hydrate or hydrazine salt in the reaction medium above 0.001 mol/dm3, the concentration of mineral acid in the reaction medium in the range from zero mol/dm3 to 10 mol/dm3, the concentration of halide anions added to the reaction medium in the range from zero mmol/dm3 to 100 mmol/dm3, the concentration of the solid catalyst in the reaction medium in the range from 0.01 g/dm3 to 100 g/dm3, the space velocity of the oxygen containing gas in the range from 100 cm3/g catalyst/h to 100,000 cm3/g catalyst/h, the mass ratio of hydrazine hydrate or hydrazine salt to solid catalyst in the range from 0.01 to 100, the temperature below 100° C., the pressure at least 0.95 atm, and the reaction contact time above 0.02 h; and ii) separating the H2O2 from the reaction mixture.

公开(公告)号：US06933397B2

公开(公告)日：2005-08-23

申请号：US10665356

申请日：2003-09-22

Applicant: Vasant R. Choudhary ,  Nilesh S. Patil ,  Balu S. Uphade ,  Prabhas Jana

Inventor： Vasant R. Choudhary ,  Nilesh S. Patil ,  Balu S. Uphade ,  Prabhas Jana

IPC: C07D301/12 ,  C07D301/19

CPC classification number: C07D301/19

Abstract: The present invention relates to a process for the liquid phase epoxidation of a normally liquid olefinic compound to corresponding organic epoxide compound using aqueous or anhydrous organic hydroperoxide as an oxidizing agent in the presence of a supported nano-gold catalysts at the effective organic hydroperoxide/olefinic compound mole ratio, catalyst/olefinic compound weight ratio and temperature to yield the epoxide.

公开(公告)号：US20060120949A1

公开(公告)日：2006-06-08

申请号：US11167573

申请日：2005-06-27

Applicant: Vasant Choudhary ,  Chancal Samanta ,  Prabhas Jana

Inventor： Vasant Choudhary ,  Chancal Samanta ,  Prabhas Jana

IPC: C01B15/01

CPC classification number: C01B15/029

Abstract: A method for improving drastically both the selectivity and yield of hydrogen peroxide in the direct oxidation of hydrogen to hydrogen peroxide over a solid catalyst comprising palladium, which comprises: i) depositing on the solid catalyst at least two halogen containing compounds, one compound essentially comprising bromine and second compound essentially comprising fluorine with the bromine to palladium and fluorine to palladium atom ratios in the range from 0.02 to 20 and from 0.01 to 50, respectively; ii) decomposing the halo compounds deposited on the solid catalyst by calcination at a temperature above 200° C. under inert, reducing or oxidizing gas atmosphere or under vacuum; and iii) contacting the solid catalyst obtained from step (ii) with a gas mixture consisting of hydrogen and oxygen or air or O2 enriched air in an aqueous reaction medium, comprising a mineral acid at the following reaction conditions: concentration of mineral acid in the reaction medium above 0.001 mol/dm3, concentration of the solid catalyst in the reaction medium above 0.01 g/dm3, H2/O2 mole ratio in the gas mixture in the range from 0.01 to 10, flow rate of the gas mixture in the range from 50 cm3/g catalyst/h to 50,000 cm3/g catalyst/h, gas pressure at least 0.9 atm, and temperature below 100° C. and contact period of the reaction medium at least 0.01 h, is disclosed.

Abstract translation: 一种用于在包含钯的固体催化剂中将氢气直接氧化成过氧化氢的过氧化氢的选择性和产率大大提高的方法，其包括：i）在固体催化剂上沉积至少两种含卤素的化合物，一种化合物基本上包含 溴和第二化合物，其主要包含氟，溴与钯和氟与钯的比例分别为0.02至20和0.01至50; ii）通过在惰性，还原或氧化气体气氛或真空下在高于200℃的温度下煅烧来分解沉积在固体催化剂上的卤代化合物; 和iii）将由步骤（ii）获得的固体催化剂与由氢气和氧气组成的气体混合物或空气或富含O 2的空气在含水反应介质中接触，所述反应介质在下列反应中包含无机酸 条件：反应介质中无机酸的浓度高于0.001mol / dm 3，反应介质中的固体催化剂浓度高于0.01g / dm 3，H

公开(公告)号：US20050065355A1

公开(公告)日：2005-03-24

申请号：US10665356

申请日：2003-09-22

Applicant: Vasant Choudhary ,  Nilesh Patil ,  Balu Uphade ,  Prabhas Jana

Inventor： Vasant Choudhary ,  Nilesh Patil ,  Balu Uphade ,  Prabhas Jana

IPC: C07D301/12 ,  C07D301/19

CPC classification number: C07D301/19

Abstract: The present invention relates to a process for the liquid phase epoxidation of a normally liquid olefinic compound to corresponding organic epoxide compound using aqueous or anhydrous organic hydroperoxide as an oxidizing agent in the presence of a supported nano-gold catalysts at the effective organic hydroperoxide/olefinic compound mole ratio, catalyst/olefinic compound weight ratio and temperature to yield the epoxide.

Abstract translation: 本发明涉及在负载的纳米金催化剂存在下，在有效的有机氢过氧化物/烯属物上使用水或无机有机氢过氧化物作为氧化剂，将正常液体的烯属化合物液相环氧化成相应的有机环氧化合物的方法 化合物摩尔比，催化剂/烯烃化合物的重量比和温度，得到环氧化物。