公开(公告)号：US07432222B2

公开(公告)日：2008-10-07

申请号：US10978791

申请日：2004-11-01

Applicant: Vasant Ramchandra Choudhary ,  Kartick Chandra Mondal ,  Ajit Singh Mamman

Inventor： Vasant Ramchandra Choudhary ,  Kartick Chandra Mondal ,  Ajit Singh Mamman

IPC: B01J23/00 ,  C01B3/26 ,  C01B3/28

CPC classification number: C01B3/386 ,  B01J21/066 ,  B01J23/002 ,  B01J23/83 ,  B01J35/1009 ,  B01J37/0201 ,  B01J2523/00 ,  C01B2203/0261 ,  C01B2203/1041 ,  C01B2203/1052 ,  C01B2203/1058 ,  C01B2203/1241 ,  Y02P20/142 ,  Y02P20/52 ,  B01J2523/17 ,  B01J2523/22 ,  B01J2523/36 ,  B01J2523/3712 ,  B01J2523/847 ,  B01J2523/845

Abstract: This invention discloses a high temperature stable, supported, non-noble metal catalyst, represented by a general formula: NiCoaCebMgcYdOx(y)/S, wherein S is a low surface area, macroporous, highly sintered, solid support comprising zirconium and hafnium oxides with less than 3 wt % silica and/or alumina having a surface area less than 1.0 m2/g and pore diameter greater than 0.1 micron, in the form of pellet, ring, monolith or granules; a is from 0.01 to 10; b is from 0.001 to 10; c is from 0.001 to 10; d is from 0.005 to 5; x is number of oxygen atoms required to fulfill the valance requirement of the metallic elements; and y is weight percent loading of the active catalyst mass, on the support, S, in the range from 0.7% to 70%. The invention also discloses a process for the partial oxidation of hydrocarbon(s) to syngas using the thermally stable catalyst.

Abstract translation: 本发明公开了一种高温稳定的，负载型的非贵金属催化剂，由以下通式表示：NiCo a S a B b Mg C y （y）/ S，其中S是低表面积，大孔，高度烧结的固体载体，其包含锆和氧化铪，具有小于3重量％的二氧化硅 和/或表面积小于1.0m 2 / g且孔径大于0.1微米的氧化铝，以颗粒，环，整料或颗粒的形式; a为0.01〜10; b为0.001〜10; c为0.001〜10; d为0.005〜5; x是满足金属元素的价格要求所需的氧原子数; y是活性催化剂物质在载体上的重量百分比，S在0.7％至70％的范围内。 本发明还公开了一种使用热稳定催化剂将烃部分氧化成合成气的方法。

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：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：US06534440B2

公开(公告)日：2003-03-18

申请号：US09725640

申请日：2000-11-29

Applicant: Vasant Ramchandra Choudhary ,  Abaji Govind Gaikwad ,  Subhash Dwarkanath Sansare

Inventor： Vasant Ramchandra Choudhary ,  Abaji Govind Gaikwad ,  Subhash Dwarkanath Sansare

IPC: B01J2344

CPC classification number: B01J23/44 ,  B01J21/04 ,  B01J21/18 ,  B01J23/40 ,  B01J23/63 ,  B01J37/12 ,  C01B15/029

Abstract: This invention provides a process for the activation of a metallic palladium containing catalyst which is useful for the direct oxidation of hydrogen by oxygen to hydrogen peroxide, by treating the catalyst with an oxidising agent in order to at least partially oxidise the metallic palladium contained in the catalyst to palladium (TT) oxide. The selectivity and yield of the catalyst for hydrogen peroxide are observed to increase substantially and the hydrogen peroxide decomposition activity of the catalyst is drastically reduced.

公开(公告)号：US06420596B1

公开(公告)日：2002-07-16

申请号：US09725642

申请日：2000-11-29

Applicant: Vasant Ramchandra Choudhary ,  Kshudiram Mantri ,  Suman Kumar Jana

Inventor： Vasant Ramchandra Choudhary ,  Kshudiram Mantri ,  Suman Kumar Jana

IPC: C07C6702

CPC classification number: C07C67/08 ,  C07C69/003 ,  C07C69/14 ,  C07C69/157 ,  C07C69/78

Abstract: This invention provides a process for the selective esterfication of a tertiary alcohol(I) by an acid anhydride(II) to produce corresponding tertiary ester(III) and carboxylic acid(V), using a reusable solid catalyst(IV) comprising one or more halides of indium, gallium, zinc and iron. The process comprises: (i) contacting a mixture of (I) and (II) in the absence or presence of a non aqueous solvent with the fine particles of (IV) in a stirred batch reactor provided with a reflux water condenser at atmospheric pressure at the reaction conditions, such that the mole ratio of (II) to (I) is in the range from about 0.1 to about 10.0; the weight ratio of (IV) to (I+II) is in the range from about 0.005 to about 0.5; the reaction temperature is below about 80° C., and the reaction period is in the range from about 0.1 h to about 50 h; (ii) removing the solid catalyst(IV) from the reaction mixture by filtration; and (iii) reusing the separated solid catalyst for subsequent batch of the process.

Abstract translation: 本发明提供一种通过酸酐（II）选择性酯化叔醇（I）以产生相应的叔酯（III）和羧酸（V）的方法，使用包含一种或多种的可重复使用的固体催化剂（IV） 铟，镓，锌和铁的卤化物。 该方法包括：（i）在不存在或不存在非水溶剂的情况下，将（I）和（II）的混合物与（IV）的细颗粒在设置有回流水冷凝器的搅拌间歇反应器中在大气压下接触 在反应条件下使得（II）与（I）的摩尔比在约0.1至约10.0的范围内; （IV）至（I + II）的重量比在约0.005至约0.5的范围内; 反应温度低于约80℃，反应时间为约0.1小时至约50小时; （ii）通过过滤从反应混合物中除去固体催化剂（IV）; 和（iii）将分离的固体催化剂重新用于后续批次的方法。

公开(公告)号：US06180557B2

公开(公告)日：2001-01-30

申请号：US09209834

申请日：1998-12-11

Applicant: Vasant Ramchandra Choudhary ,  Suman Kumar Jana ,  B-Phani Kiran

Inventor： Vasant Ramchandra Choudhary ,  Suman Kumar Jana ,  B-Phani Kiran

IPC: B01J2706

CPC classification number: B01J27/125 ,  B01J23/08 ,  B01J27/128 ,  C07C45/46

Abstract: A supported catalyst and a process for the preparation of the catalyst, the catalyst containing mixed metal oxides or halides deposited on porous catalyst carriers or supports, useful for heterogeneously or solid catalyzed Friedel-Crafts reactions such as alkylation, aralkylation, acylation, or aroylation of aromatic compounds in the preparation of fine chemicals. The supported catalyst has high activity for the Friedel-Crafts reactions when the aromatic ring activating groups are present in the aromatic ring to be aralkylated, acylated or aroylated, and also when the ring activating group is absent or when aromatic ring deactivating groups are present in the aromatic ring to aralkylated, acylated or aroylated, so that the reaction temperature is low and/or the time for completing the reaction is short. The catalyst can be separated and used repeatedly for catalytic reactions.

Abstract translation: 负载催化剂和催化剂的制备方法，催化剂含有沉积在多孔催化剂载体或载体上的混合金属氧化物或卤化物，可用于非均相或固体催化的Friedel-Crafts反应，例如烷基化，芳烷基化，酰化或芳基化 芳香族化合物在精细化学品的制备中。 当芳环活性基团存在于待芳烷基化，酰化或酰化的芳环中时，以及当环活化基团不存在或芳环失活基团存在时，负载型催化剂对于Friedel-Crafts反应具有高活性 芳环进行芳烷基化，酰化或丙烯酰化，使反应温度低，和/或完成反应的时间短。 催化剂可以分离并重复使用用于催化反应。

公开(公告)号：US5744419A

公开(公告)日：1998-04-28

申请号：US517213

申请日：1995-08-21

Applicant: Vasant Ramchandra Choudhary ,  Balu Shivaji Uphade ,  Ajit Singh Mamman ,  Amarjeet Munshiram Rajput

Inventor： Vasant Ramchandra Choudhary ,  Balu Shivaji Uphade ,  Ajit Singh Mamman ,  Amarjeet Munshiram Rajput

IPC: B01J23/755 ,  B01J23/78 ,  B01J23/89 ,  B01J37/02 ,  C01B3/38 ,  C01B3/40 ,  B01J23/40 ,  B01J23/58 ,  B01J23/72

CPC classification number: B01J37/024 ,  B01J23/755 ,  B01J23/78 ,  B01J23/8946 ,  C01B3/386 ,  C01B3/40 ,  C01B2203/0233 ,  C01B2203/0238 ,  C01B2203/0261 ,  C01B2203/1017 ,  C01B2203/1052 ,  C01B2203/1064 ,  C01B2203/1082 ,  C01B2203/1241 ,  C01B2203/1619 ,  Y02P20/142 ,  Y02P20/52

Abstract: A supported catalyst is prepared by depositing oxides of nickel and cobalt, with or without noble metals, on a sintered low surface area porous inert support, surface of which is precoated with an oxide of Be, Mg, Ca or a mixture thereof so that a protective layer of the alkaline earth oxide is formed between the oxides of nickel and cobalt, with or without noble metal, and the support and hence direct chemical interactions between the oxides of the group VIII transition metals and the reactive components of support, which leads to the formation of catalytically inactive binary oxide phases are avoided.

Abstract translation: 通过在具有或不含有贵金属的镍和钴的氧化物上沉积有烧结的低表面积的多孔惰性载体，其表面用Be，Mg，Ca或其混合物的氧化物预涂布来制备负载型催化剂，使得 在具有或不具有贵金属的镍和钴的氧化物之间形成碱土金属氧化物的保护层，以及由第VIII族过渡金属的氧化物和载体的反应性组分之间的载体和因此的直接化学相互作用，这导致 避免了催化无活性的二元氧化物相的形成。

公开(公告)号：US07022307B2

公开(公告)日：2006-04-04

申请号：US10725723

申请日：2003-12-02

Applicant: Vasant Ramchandra Choudhary ,  Tushar Vasant Choudhary

Inventor： Vasant Ramchandra Choudhary ,  Tushar Vasant Choudhary

IPC: C01B3/24 ,  C10G11/00 ,  C07C51/255

CPC classification number: B01J8/1809 ,  B01J8/0055 ,  B01J8/1818 ,  B01J2208/00548 ,  C10G2/332 ,  C10G2/344 ,  C10G9/32 ,  C10G11/18 ,  C10G35/14 ,  C10G47/18 ,  C10G47/30

Abstract: The present invention relates to a method for gas-solid contacting in a bubbling fluidized bed reactor by: (a) introducing into a reactor with bed length to bed diameter ratio below about 5.0, a primary gas consisting essentially of reactant(s) of the reaction to be carried out in the bed of solid particles through a primary gas distributor located at the reactor bottom at a superficial gas velocity Up, which is very close or equivalent to the minimum fluidization velocity Umf, required for achieving the incipient fluidization of the solid particles in the bed to obtain an emulsion phase consisting essentially of the solid particles and the primary gas with little or no formation of gas bubbles to achieve incipient fluidization or liquid-like behaviour of fluidizable solid particles; (b) forming gas bubbles in the incipiently fluidized bed by introducing through a secondary gas distributor located immediately above the primary gas distributor a secondary gas, selected from one of the reactants which is used in excess of that required for the reaction stoichiometry, steam, an inert or a mixture of two or more thereof at a superficial gas velocity, Us, which is related to the superficial velocity of the primary gas such that a ratio of the superficial velocity of the secondary gas to the superficial velocity of the primary gas Us/Up, is in the range from about 0.5 to about 10.0, preferably from about 1 to about 5.

Abstract translation: 本发明涉及通过以下步骤在鼓泡流化床反应器中气 - 固接触的方法：（a）将床长至床直径比低于约5.0引入反应器中，主要气体基本上由 在固体颗粒床上通过位于反应器底部的初级气体分布器以表面气体速度U P p P进行反应，该气体速度非常接近或等于最小流化速度U

公开(公告)号：US06548722B1

公开(公告)日：2003-04-15

申请号：US09685682

申请日：2000-10-10

Applicant: Vasant Ramchandra Choudhary ,  Suman Kumar Jana

Inventor： Vasant Ramchandra Choudhary ,  Suman Kumar Jana

IPC: C07C30900

CPC classification number: C07C41/30 ,  C07C2/861 ,  C07C2/864 ,  C07C45/46 ,  C07C201/12 ,  C07C2521/10 ,  C07C2523/08 ,  C07C2527/236 ,  C07C2603/24 ,  C07C15/16 ,  C07C49/784 ,  C07C49/83 ,  C07C49/84 ,  C07C49/786 ,  C07C205/06 ,  C07C15/12 ,  C07C15/28 ,  C07C43/205

Abstract: A process for Friedel-Crafts type liquid-phase alkylation or acylation of an aromatic compound using a hydrotalcite-type basic anionic clay catalyst represented by a formula: [(M2−)1−x(M3+)x(OH)2]x+[Ay−]x/yqH2O where M2+ is a divalent cation selected from Mg2+, Zn2+, Ni2+, Co2+, Mn2+, Cu2+ or a mixture thereof; M3+ is a trivalent cation selected from Ga3+, In3+ Al3+, Fe3+ Cr3+ or a mixture thereof; x is a mole fraction of trivalent cations in the range of about 0.05 to about 0.5; 0 is oxygen; H is hydrogen; Ay− is an anion; y minus is an anionic negative charge having a value of 1 minus or 2 minus; and q is a number of water molecules, as the water of hydration; and involving following steps: i. pretreating said catalyst by contacting it with a halogen containing compound in the presence or absence of a non-aqueous solvent and optionally washing the pretreated catalyst with non-aqueous solvent or liquid aromatic compound to be alkylated or acylated; and then ii. contacting a liquid reaction mixture comprising said aromatic compound and said alkylating or acylating agent in the presence or absence of a non-aqueous solvent with the catalyst obtained from step (i) in a stirred batch reactor fitted with a reflux condenser under vigorous stirring, in the presence or absence of an inert gas bubbling through the reaction mixture, at effective reaction conditions; iii. cooling the reaction mixture to a temperature about 30° C., removing said catalyst from the reaction mixture by filtration and then separating the reaction products from the reaction mixture, and optionally washing the used catalyst by non-aqueous solvent, and if desired, iv. reusing the used catalyst directly with or without drying for the subsequent reaction batch avoiding step (i), is disclosed.

Abstract translation: 使用由下式表示的水滑石型碱性阴离子粘土催化剂，使用Friedel-Crafts型液相烷基化或芳族化合物酰化的方法：其中M2 +是选自Mg2 ​​+，Zn2 +，Ni2 +，Co2 +，Mn2 +，Cu2 +或 其混合物; M3 +是选自Ga3 +，In3 + Al3 +，Fe3 + Cr3 +或其混合物的三价阳离子; x是三价阳离子在约0.05至约0.5范围内的摩尔分数; 0是氧; H是氢; Ay-是阴离子; y minus是具有值1或2减去的阴离子负电荷; 和q是水分子的数量，作为水合水; 并涉及以下步骤：i。 在存在或不存在非水溶剂的情况下，通过使其与含卤素的化合物接触来预处理所述催化剂，并任选地用待进行烷基化或酰化的非水溶剂或液体芳族化合物洗涤预处理的催化剂; 然后。 在非水溶剂存在或不存在下，将含有所述芳族化合物和所述烷基化或酰化剂的液体反应混合物与步骤（i）获得的催化剂在剧烈搅拌下在装有回流冷凝器的搅拌间歇式反应器中接触， 在有效的反应条件下存在或不存在通过反应混合物鼓泡的惰性气体; iii。 将反应混合物冷却至约30℃的温度，通过过滤从反应混合物中除去所述催化剂，然后将反应产物与反应混合物分离，并任选地通过非水溶剂洗涤所用催化剂，如果需要，将iv 。 公开了直接使用或不用干燥后续反应批次的用过的催化剂，以避免步骤（i）。

公开(公告)号：US06509000B1

公开(公告)日：2003-01-21

申请号：US09652377

申请日：2000-08-31

Applicant: Vasant Ramchandra Choudhary ,  Amarjeet Munshiram Rajput ,  Subhabrata Banerjee

Inventor： Vasant Ramchandra Choudhary ,  Amarjeet Munshiram Rajput ,  Subhabrata Banerjee

IPC: C01B326

CPC classification number: C01B3/042 ,  C01B3/26 ,  C01B2203/0277 ,  C01B2203/1052 ,  C01B2203/1082 ,  C01B2203/1241 ,  Y02E60/364

Abstract: A process for the continuous production of hydrogen from methane and/or natural gas and/or methane-rich hydrocarbons and steam at low temperature, using a solid catalyst comprising group VIII metal oxide(s) in two parallel reactors, comprising reducing the solid catalyst in both the reactors by contacting the catalyst with a gaseous feed comprising a reducing agent, contacting a first gaseous feed comprising methane and/or natural gas and/or methane rich hydrocarbons, simultaneously contacting a second gaseous feed comprising steam called Feed-B with the solid catalyst reduced in step-i in a second reactor. while regularly switching over the two feeds, Feed-A arid Feed-B, between the two parallel reactors to obtain a mixed product stream comprising hydrogen from the two reactors.

Abstract translation: 一种使用在两个平行反应器中使用包含第VIII族金属氧化物的固体催化剂在低温下从甲烷和/或天然气和/或富含甲烷的烃和蒸汽连续生产氢气的方法，包括还原固体催化剂 在两个反应器中，通过使催化剂与包含还原剂的气态进料接触，使包含甲烷和/或天然气和/或富含甲烷的烃的第一气态进料接触，同时使包含称为进料B的蒸汽的第二气态进料与 固体催化剂在步骤i中在第二反应器中还原。 同时定期切换两个平行反应器之间的两个进料A，进料-B，以从两个反应器获得包含氢气的混合产物流。