公开(公告)号：US5573992A

公开(公告)日：1996-11-12

申请号：US330762

申请日：1994-10-28

Applicant: Rashmikant M. Contractor ,  Donald I. Garnett ,  Harold S. Horowitz ,  Arthur W. Sleight

Inventor： Rashmikant M. Contractor ,  Donald I. Garnett ,  Harold S. Horowitz ,  Arthur W. Sleight

IPC: B01J27/198 ,  B01J37/08 ,  C07C51/215

CPC classification number: C07C51/215 ,  B01J23/002 ,  B01J27/198 ,  B01J2523/00

Abstract: An improved process for calcination and activation of a catalyst containing mixed oxides of vanadium and phosphorus (V/P/O) comprising the steps of calcining a hydrated V/P/O or V/P/O- SiO.sub.2 catalyst precursor at a temperature range of 375.degree. to 400.degree. C. for sufficient time to dehydrate said catalyst precursor while simultaneously and continuously controlling the oxygen level such as to maintain the Vox in the range of 3.825 to 4.175; and then activating the dehydrated catalyst precursor by further heating at a range of 340.degree. to 500.degree. C. in the presence of a gaseous atmosphere containing n-butane at a partial pressure not exceeding 0.20 atm while simultaneously and continuously controlling the oxygen level such as to maintain the Vox in the range of 3.95 to 4.15. Such a V/P/O catalyst is useful in the preparation of maleic anhydride from n-butane.

Abstract translation: 一种用于煅烧和活化含有钒和磷的混合氧化物（V / P / O）的催化剂的改进方法，包括在温度范围下煅烧水合V / P / O或V / P / O-SiO 2催化剂前体的步骤 在375℃至400℃下充分时间使所述催化剂前体脱水，同时并连续地控制氧水平，以维持Vox在3.825至4.175的范围内; 然后在含有正丁烷的气态气氛存在下，在不超过0.20atm的压力的条件下，在340〜500℃的范围内进一步加热活化脱水催化剂前体，同时连续地控制氧水平，例如 以维持Vox在3.95至4.15的范围内。 这种V / P / O催化剂可用于从正丁烷制备马来酸酐。

公开(公告)号：US4668802A

公开(公告)日：1987-05-26

申请号：US692474

申请日：1985-01-18

Applicant: Rashmikant M. Contractor

Inventor： Rashmikant M. Contractor

IPC: C07D307/60 ,  B01J8/08 ,  B01J27/00 ,  B01J27/198 ,  B01J27/28 ,  B01J38/12 ,  C07B61/00 ,  C07C51/215

CPC classification number: B01J8/08 ,  C07C51/215 ,  Y02P20/584

Abstract: Oxidation of butane to maleic anhydride using a vanadium-phosphorus oxide catalyst, in oxidized form, wherein the resulting reduced catalyst is separately regenerated. A recirculating solids reactor can be employed. Less than the stoichiometric amount of oxygen, based on the total amount of butane converted, can be employed.

Abstract translation: 使用氧化形式的钒 - 磷氧化物催化剂将丁烷氧化成马来酐，其中所得的还原催化剂分别再生。 可以使用循环固体反应器。 可以使用低于化学计量量的氧，基于转化的丁烷的总量。

公开(公告)号：US3932915A

公开(公告)日：1976-01-20

申请号：US497046

申请日：1974-08-09

Applicant: Rashmikant M. Contractor ,  Sang-Hak Hwang

Inventor： Rashmikant M. Contractor ,  Sang-Hak Hwang

IPC: D01G25/00 ,  D04H1/72

CPC classification number: D04H1/72

Abstract: Process and apparatus are disclosed which are suitable for high speed production of uniform, lightweight webs by air-laydown of textile fibers. A toothed disperser roll doffs the fibers into an air stream of high uniform velocity and low turbulence to form a thin fiber stream from which the fibers are deposited in web form on a moving screen. A curved disperser plate, shrouds the disperser roll and prevents premature doffing. By using a disperser plate with a rough surface, preferably one having lateral grooves, web uniformity is remarkably improved.

Abstract translation: 公开了适于通过纺织纤维的空气沉积来高速生产均匀的轻质纤维网的方法和设备。 齿形分散机将纤维拖入高均匀速度和低湍流的空气流中以形成细纤维流，纤维以网状形式沉积在移动筛网上。 弯曲的分散机板，覆盖分散机辊并防止过早的落纱。 通过使用具有粗糙表面的分散板，优选具有侧向凹槽的分散板，幅材均匀性显着提高。

公开(公告)号：US5519149A

公开(公告)日：1996-05-21

申请号：US330770

申请日：1994-10-28

Applicant: Rashmikant M. Contractor ,  Harold S. Horowitz ,  Gregg M. Sisler

Inventor： Rashmikant M. Contractor ,  Harold S. Horowitz ,  Gregg M. Sisler

IPC: B01J27/198 ,  B01J27/28 ,  B01J38/12 ,  B01J38/68 ,  C07B61/00 ,  C07C51/215 ,  C07D307/60 ,  C07D307/34

CPC classification number: B01J38/68 ,  B01J27/285 ,  C07C51/215 ,  Y02P20/584

Abstract: An improved process for selective vapor phase oxidation of n-butane to maleic anhydride involving the use of a recirculating solids reactor having a reaction zone and a catalyst regeneration zone wherein n-butane is converted to maleic acid in the reaction zone by use of a vanadium/phosphorous oxide (V/P/O) catalyst in oxidized form and the reduced vanadium/phosphorous oxide catalyst is regenerated by contact with oxygen in the regeneration zone. Replenishment of the inherent catalyst losses associated with the catalyst recycling process is accomplished by adding to the catalyst in the regeneration zone vanadium/phosphorous oxide catalyst precursor at a rate of addition that effectuates in situ calcination and activation of the vanadium/phosphorous oxide catalyst precursor while simultaneously maintaining the desired operating temperature of the n-butane to maleic anhydride conversion reaction. Such a process is useful in maintaining the high operating capacity of the reactor over an extended period of time.

Abstract translation: 涉及使用具有反应区和催化剂再生区的再循环固体反应器的正丁烷选择性气相氧化为马来酸酐的改进方法，其中正丁烷通过使用钒转化为反应区中的马来酸 氧化形式的氧化亚铜（V / P / O）催化剂和还原的钒/磷氧化物催化剂通过与再生区中的氧接触而再生。 与催化剂再循环过程相关的固有催化剂损失的补充通过在再生区钒/磷氧化物催化剂前体中以催化剂加入的速率加入催化剂来实现，该速率实现了钒/氧化磷催化剂前体的原位煅烧和活化， 同时保持正丁烷所需的操作温度至马来酸酐转化反应。 这种方法对于在长时间内维持反应堆的高操作能力是有用的。

公开(公告)号：US5021588A

公开(公告)日：1991-06-04

申请号：US236743

申请日：1988-08-26

Applicant: Rashmikant M. Contractor

Inventor： Rashmikant M. Contractor

IPC: B01J8/08 ,  C07C51/215

CPC classification number: B01J8/08 ,  C07C51/215

Abstract: The oxidation of butane to maleic anhydride in a recirculating solids reactor using a stoichiometric excess of oxygen, a vanadium-phosphorus oxide catalyst in oxidized form, and separate regeneration of the resultant reduced catalyst is disclosed.

Abstract translation: 公开了在使用化学计量过量的氧气的再循环固体反应器中将丁烷氧化成马来酸酐，氧化形式的钒 - 氧化磷催化剂和所得还原催化剂的分离再生。

公开(公告)号：US3981047A

公开(公告)日：1976-09-21

申请号：US577056

申请日：1975-05-13

Applicant: Rashmikant M. Contractor ,  Sang-Hak Hwang

Inventor： Rashmikant M. Contractor ,  Sang-Hak Hwang

IPC: D01G25/00 ,  D04H1/72

CPC classification number: D04H1/72

Abstract: Apparatus for depositing staple fibers onto a conveyor belt to form a batt, including a chute feeder having an adjustable weir plate provided with a row of air jets along the bottom edge for maintaining a uniform fiber level at the exit from the chute. Fibers are supplied in an air stream from which they are separated by condenser means and fall into the chute over distributing baffles.

Abstract translation: 用于将短纤维沉积到传送带上以形成絮垫的设备，包括具有可调节堰板的滑槽进料器，所述堰板沿着底部边缘设置有一排空气射流，以保持在与滑槽出口处的均匀纤维水平。 纤维被供应在空气流中，它们通过冷凝器装置分离，并在分配挡板上落入滑槽中。