King Fahd University of Petroleum and Minerals

Japan Cooperation Center, Petroleum (jccp)

Mohammad Ashraf Ali

Shakeel Ahmed

Muhammad Khalid

Tomoyuki Inui

John H Lienhard

Mohammed Ashraf Gondal

Syed Mohammad Zubair

Syed Ahmed Ali

Mohamed Abdulkader Dastageer

Halim Hamid Redhwi

Xiaofeng Chang

Minoru Hatayama

Muhammad A Al-Saleh

Katsuhiko Ishikawa

Takuma Kimura

Mohammad Abdullah Al-Saleh

Masayuki Inui, Legal Representative

Khalid Al-Nawad

Tsutomo Okamoto

An inverter topology circuit that includes a direct current source; a first capacitor; a second capacitor, and a number of switches (a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, and an eleventh switch). A first side of the first switch and a first side of the third switch are connected to a first side of the direct current source. A first side of the second switch and a first side of the fourth switch are connected to a second side of the direct current source. The first capacitor and the second capacitor are connected in series and are connected in parallel with the direct current source.

Inverter topology circuit

A doubly fed induction generator (DFIG) speed control system is provided. The system includes a wind turbine and a wound rotor induction generator connected to the wind turbine through a drive train system and to a power grid. The system further includes a back-to-back voltage source converter (VSC) with a rotor side converter (RSC) and a grid side converter (GSC). The RSC is connected to the wound rotor induction generator and the GSC is connected to the power grid. A wind profile sensor measures a wind profile and a VSC controller provides control to the RSC and the GSC. The VSC controller applies a nonsingular fast terminal sliding mode control (NSFTSMC) scheme at the RSC at least partially based on the received wind profile to stabilize a rotor speed of the wound rotor induction generator.

Doubly fed induction generator speed control system and method for controlling the system

A catalyst system and a process for methanol to light olefin conversion with enhanced selectivity towards propylene. The catalyst system comprises a honeycomb monolith catalyst support coated with aluminosilicate nanozeolite catalysts on the edges and inside the channels of the support structure. The aluminosilicate nanozeolite catalysts have not been pre-modified with a promoter metal. The catalyst system gives higher hydrothermal stability to the catalyst compared to randomly packed pellet catalysts and allows methanol to be converted to predominantly propylene at a low temperature, with decreased selectivity towards C, higher olefins and paraffinic hydrocarbons.

Method for forming light olefins from methanol

Method for methanol conversion to propylene over a monolithic catalyst system

A catalyst system and a process for methanol to light olefin conversion with enhanced selectivity towards propylene. The catalyst system comprises a honeycomb monolith catalyst support coated with nanozeolite catalysts on the edges and inside the channels of the support structure. The nanozeolite catalysts have been pre-modified with metal. The catalyst system gives higher hydrothermal stability to the catalyst compared to randomly packed pellet catalyst and allows methanol to be converted to predominantly propylene at a low temperature, with decreased selectivity towards C, higher olefins and paraffinic hydrocarbons.

Monolith structure loaded with metal promoted nanozeolites for enhanced propylene selectivity in methanol conversion

Honeycomb monolith structure loaded with nanozeolites for enhanced propylene selectivity in methanol conversion

A hydrocracking catalyst, containing a USY zeolite modified by treatment with an organic acid to remove aluminum, an alumina binder, two or more metals selected from metals of Groups VIB and VIII, and cerium in the range oftowt %. A method of making the hydrocracking catalyst, whereby a USY zeolite is treated with an organic acid to remove aluminum from the zeolite structure and subsequently impregnating with a rare earth metal of the Lanthanide series to form a modified USY zeolite. The modified USY zeolite is mixed with alumina comprising a peptizing agent and impregnated with two or more metals selected from metals of Groups VIB and VIII.

Modified zeolite second stage hydrocracking catalyst and use of thereof for hydrocarbon conversion

The wastewater filtration system and method relates to systems and methods that use Ruba Al-Khali Saudi sand as the filtration media in systems for treating industrial wastewater. Ruba Al-Khali Saudi sand is effective in removing organic dyes, particularly rhodamine B, from the wastewater. The method includes bringing wastewater having an organic dye constituent into contact with the Saudi sand for a period of time sufficient to adsorb the organic dye. The system may include a batch reactor, such as a fixed bed or moving bed reactor, or a continuous flow reactor, such as a column reactor. When a batch reactor is used, the method may benefit from shaking or agitating the filtration media, particularly in the dark or under low ambient light conditions. The method may include regenerating the Saudi sand after use by heating the filtration media.

Wastewater filtration system and method

The catalyst exhibiting hydrogen spillover effect relates to the composition of a catalyst exhibiting hydrogen spillover effect and to a process for preparing the catalyst. The catalyst has a reduced transition base metal of Group VIB or Group VIIIB, such as cobalt, nickel, molybdenum or tungsten, supported on a high porous carrier, such as saponite, the base metal being ion-exchanged with at least one precious metal of Group VIIIB. The process includes the steps of loading the base metal onto the support, reducing the base metal, preferably with Hat 600&#xb0; C., and thereafter ion-exchanging the precious metal with the base metal. Preferred examples of the catalyst include a saponite support loaded with about 10-20 wt % cobalt and about 0.1-1 wt % precious metal. The catalyst is optimized for reactions that occur in commercial processes at about 360-400&#xb0; C., such as in hydrocracking.

Catalyst exhibiting hydrogen spillover effect

The multiple zeolite catalyst is a catalytic composition used to convert Calkylaromatic hydrocarbons to BTX, particularly commercially valuable xylenes. The catalyst is formed by mixing at least two zeolites selected from mordenite, beta zeolite, ZSM-5, ZSM-11, ZSM-12, ZSM-22, ZSM-23, MFI topology zeolite, NES topology zeolite, EU-1, MAPO-36, SAPO-5, SAPO-11, SAPO-34, and SAPO-41, and adding at least one metal component selected from Group VIB and Group VIII of the Periodic Table of the Elements. The two zeolites should have different physical and chemical characteristics, such as pore size and acidity. An exemplary catalyst includes mordenite, ZSM-5, and 3 wt. % molybdenum. The transalkylation reaction may be conducted in one or more reactors with a fixed bed, moving bed, or radial flow reactor at 200-540&#xb0; C., a pressure of 1.0-5.0 MPa, and liquid hourly space velocity of 1.0-5.0 per hour.

Multiple zeolite catalyst

This invention concerns an improved and novel catalyst for preparing methyl tertiary butyl ether (MTBE). This invention is advantageous in that the reaction of methanol and isobutene takes place such that the catalysts exhibit levels of isobutene conversion as high as 98%, and the MTBE selectivity reaches as high as 98%. The improved catalysts comprises of a crystalline aluminosilicate zeolites, particularly MFI-type zeolites which has been treated with aluminum fluoride in the ratio 1 gram to 10 grams of zeolite with 0.5 gram to 5 grams of aluminum fluoride. A specific application of this improved and novel catalyst is reacting methanol and isobutene in a molar amount of about 0.1 mole to 10 moles of methanol per mole of isobutene, in the presence of said catalyst in a batch reactor, at about 70&deg; C. to about 100&deg; C., and a pressure of about 1 bar to 33 bar, to obtain MTBE product.

Growing community of inventors

Dhahran, Saudi Arabia

Mohammad Ashraf Ali