Patents by Inventor Mahin Rameshni

Mahin Rameshni has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10752502
    Abstract: This disclosure relates generally to processes sour gas treating for H2S Removal, separation of impurities such as hydrocarbons, BTEX and mercaptans and the Partial Acid Gas Enrichment integrated system from the sour gas field developments, or any application. The combination of innovation schemes comprises one or more absorbers, primary and secondary regenerators. The secondary regenerator functions are, enriching the H2S stream further and to separate the hydrocarbons, mercaptans and BTEX where an additional acid gas enrichment and hydrocarbons removal could be eliminated. Then there is a unique sulfur recovery and tail gas treating with a unique 2-zone reaction furnace, tail gas absorber which operated as partial acid gas enrichment by receiving split acid gas from the SRU and the hydrolysis reactor to hydrolyze sulfur compounds.
    Type: Grant
    Filed: August 2, 2018
    Date of Patent: August 25, 2020
    Inventors: Stephen L Santo, Mahin Rameshni
  • Patent number: 10689254
    Abstract: A method and system for abating the emissions of at least sulfur dioxide present in a tail gas emitted from sulfur recovery units are provided. The invention is characterized by the provision of at least two adsorber units in a parallel arrangement. While one adsorber is in an adsorption mode, it receives a gas contaminated w/ sulfur dioxide and adsorbs and removes the sulfur dioxide out of the gas. The other adsorber is in regeneration mode, and receives an acid gas stream comprising hydrogen sulfide as well as an oxygen-containing gas to regenerate the spent adsorbent material and produce an off-gas comprising hydrogen sulfide and sulfur dioxide. This off-gas is then recycled back to the sulfur recovery unit.
    Type: Grant
    Filed: September 8, 2019
    Date of Patent: June 23, 2020
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Publication number: 20200039825
    Abstract: This disclosure relates generally to processes sour gas treating for H2S Removal, separation of impurities such as hydrocarbons, BTEX and mercaptans and the Partial Acid Gas Enrichment integrated system from the sour gas field developments, or any application. The combination of innovation schemes comprises one or more absorbers, primary and secondary regenerators. The secondary regenerator functions are, enriching the H2S stream further and to separate the hydrocarbons, mercaptans and BTEX where an additional acid gas enrichment and hydrocarbons removal could be eliminated. Then there is a unique sulfur recovery and tail gas treating with a unique 2-zone reaction furnace, tail gas absorber which operated as partial acid gas enrichment by receiving split acid gas from the SRU and the hydrolysis reactor to hydrolyze sulfur compounds.
    Type: Application
    Filed: August 2, 2018
    Publication date: February 6, 2020
    Inventors: Mahin Rameshni, Stephenl Santo
  • Publication number: 20180065851
    Abstract: SETR tail gas treating process refers to an innovative process consist of the adsorbent and regeneration reactors. The SETR reactor stands for Super Enhanced Tail gas Recovery switching between adsorption and regeneration mode and the STER reactors are located after the tail gas incineration before the stack replacing any type of the caustic scrubber system. The SETR innovative process is not a sub dew point process where the bed become saturated with sulfur, instead, the SETR process are fixed bed reactors that requires heat up and cool down for the SO2 adsorption-based Claus tail gas process. The adsorption mode operates at cold temperature to adsorb the SO2. The regenerator mode operates at hot temperature to regenerate the SO2 by adding a slip stream of the H2S and air from the SRU to the SETR reactor that contains adsorbed SO2 to promote the Claus reaction.
    Type: Application
    Filed: September 3, 2016
    Publication date: March 8, 2018
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Patent number: 9624106
    Abstract: SuperSulf process refers to an innovative reactor design consisting of internal cooling and heating thermoplate exchangers where it is filled by the Claus type catalysts between plates in the SRU and hydrogenation catalysts in the tail gas unit. SuperSulf reactor consists of 3 reactor zones in the sulfur recovery which operates as a SubDewPoint process where the mode of operation are controlled by switching valves on the utilities streams high pressure steam and high quality water and steam where the first 2 zones operate as hot and cold and switches to cold and hot where the produced sulfur is condensed. The third zone operates as cold all the time where consists of the last sulfur condenser by producing Low pressure steam. The tail gas unit consists of 2 reactor zones of hydrogenation reactor and hydrolysis reactor with internal plate cooling then followed by the tail gas amine with a selective solvent.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: April 18, 2017
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Patent number: 9617154
    Abstract: A process is provided for liquid sulfur degasification in an underground container, comprising: collecting liquid sulfur which contains polysulfides and hydrogen sulfide in a first compartment of the underground container; agitating and creating turbulence in the liquid sulfur in the first compartment of the underground container; transferring the liquid sulfur into a second compartment of the underground container; injecting gas into the liquid sulfur into the second compartment of the underground container via gas spargers, and also injecting morpholine catalyst into the liquid sulfur in the second compartment of the underground container to produce a degassed liquid sulfur; and transferring the degassed liquid sulfur into a third compartment of the underground container for storage and subsequent removal.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: April 11, 2017
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Publication number: 20170088421
    Abstract: SuperDegas process refers to innovative process of the liquid sulfur collection and degassing which takes place in the underground container in a concrete pit or a carbon steel vessel located in the concrete pit. SuperDegas process consists of at least three compartments: (1) sulfur collection to agitate and create turbulent, higher velocity, and higher pressure in the liquid sulfur for more effective degassing by using vertical pumps; (2) consists of the proprietary air spargers and Morpholine catalyst for degassing. Morpholine catalyst degas the liquid sulfur 30 times faster than Quinoline or any other solvent with sparging air and within 1 hour residence time from 16-30 hours and to meet less than 10 ppmw of H2S in liquid sulfur. (3) The last compartment receives the degassed sulfur by overflow and transport through a pump or pumps to other facilities. An eductor will sweep vapor phase containing H2S, vaporized Morpholine with air where the pit vent can be sent to incineration or the reaction furnace.
    Type: Application
    Filed: September 30, 2015
    Publication date: March 30, 2017
    Inventors: MAHIN RAMESHNI, STEPHEN L. SANTO
  • Publication number: 20170044015
    Abstract: SuperSulf process refers to an innovative reactor design consisting of internal cooling and heating thermoplate exchangers where it is filled by the Claus type catalysts between plates in the SRU and hydrogenation catalysts in the tail gas unit. SuperSulf reactor consists of 3 reactor zones in the sulfur recovery which operates as a SubDewPoint process where the mode of operation are controlled by switching valves on the utilities streams high pressure steam and high quality water and steam where the first 2 zones operate as hot and cold and switches to cold and hot where the produced sulfur is condensed. The third zone operates as cold all the time where consists of the last sulfur condenser by producing Low pressure steam. The tail gas unit consists of 2 reactor zones of hydrogenation reactor and hydrolysis reactor with internal plate cooling then followed by the tail gas amine with a selective solvent.
    Type: Application
    Filed: August 14, 2015
    Publication date: February 16, 2017
    Inventors: MAHIN RAMESHNI, Stephen L. Santo
  • Publication number: 20160347625
    Abstract: In a column provided with internals for liquid/gas contacting, the sour water feedstock is stripped using steam, then cooled by a cold liquid and washed using cold water injection. This method allows to separate an ammonia-poor (5-5000 ppm) H2S gaseous effluent and an H2S-lean (100-1000 ppm for example) purified water. The method is yet improved by adding a second column that receives the purified water from the first column and separates the hydrogen sulfide and the ammonia according to the method operated in the first column. The purified water from the second column is preferably partially injected into the first and/or the second column as wash water. A facility for implementing the method according to the invention.
    Type: Application
    Filed: June 8, 2015
    Publication date: December 1, 2016
    Applicant: PROSERNAT
    Inventors: Guillaume DALARY, Mahin RAMESHNI
  • Patent number: 9061246
    Abstract: Oxidative and reductive methods are described for the cost-effective destruction of an ammonia-bearing gas stream, potentially containing minor but significant quantities of hydrogen sulfide (H2S), in a conventional Claus sulfur recovery tail gas treating unit, using controlled rates and compositions of combustion gases in order to obtain the temperatures necessary for the desired destruction of unwanted combustibles.
    Type: Grant
    Filed: February 5, 2013
    Date of Patent: June 23, 2015
    Assignee: WorleyParsons Group, Inc.
    Inventor: Mahin Rameshni
  • Patent number: 9023309
    Abstract: Processes are for the conversion of the sulfur compounds to elemental sulfur through different catalytic stages after the reaction furnace of the Claus unit with air or oxygen. The steps are: 1—Conventional Claus thermal or catalytic stage; 2—Oxygen Scavenger catalytic stage to capture excess oxygen from the reaction furnace and to perform Claus reaction; a Selective Reduction stage that converts SO2 to elemental sulfur; and 4—Selective Oxidation stage that converts H2S to elemental sulfur. The tail gas flows to the incineration and stack and to the incineration plus caustic scrubber for achieving zero emissions.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: May 5, 2015
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Patent number: 8617509
    Abstract: Processes for the thermal reduction of sulfur dioxide to elemental sulfur in a single reaction furnace are disclosed. The reaction furnace contains an alumina monolith that performs as an active catalyst. The reaction furnace is followed by a Claus conversion zone, wherein H2S and SO2 react to produce additional elemental sulfur. Three methods to eliminate soot formation and two methods to consume produced H2 and CO are described. One or combination of these methods may be employed which consists of a) adding steam (water vapor), b) adding recycled sulfur or c) adding recycled tail gas.
    Type: Grant
    Filed: March 31, 2013
    Date of Patent: December 31, 2013
    Inventors: Mahin Rameshni, Stephen L Santo
  • Patent number: 8465722
    Abstract: Processes for the thermal reduction of sulfur dioxide to elemental sulfur are disclosed. The processes described include three general reaction sections, including the reaction furnace portion where the SO2-containing stream is combusted, the second reaction zone where the temperature is moderated to encourage the reaction of sulfur with hydrogen to consume the hydrogen carbon monoxide and produce the H2S and CO. The temperature moderation is achieved by one or combinations of three different methods adding external waste heat boiler, followed by a vessel to provide adequate residence time for the reaction of producing H2S or to recycle the tail gas to a second zone of a 2-zone reaction furnace, using inter-stage internal cooling coil or adding a quench fluid in the second zone of a 2-zone reaction furnace. The third reaction zone is a Claus conversion portion, wherein residual H2S and SO2 are further reacted to produce additional elemental sulfur.
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: June 18, 2013
    Assignee: Rameshni & Associates Technology & Engineering
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Patent number: 8440160
    Abstract: This disclosure relates generally to processes for the production of elemental sulfur from Syngas, in the power plant, or Low BTU Gas fields and more particularly to processes the mixture of the 100% syngas or low BTU stream with the 100% SO2 recycle gas; with an additional stream comprising oxygen such as air, oxygen-enriched air, or substantially pure oxygen is added to the SO2 recycle stream prior entering the Claus reactor for producing elemental sulfur. The combination of innovation schemes comprises the sulfur recovery unit, the SO2 recovery unit and the gas turbines or boilers to promote a cost effective options by reducing the number of steps in an efficient manner and to achieve near 100% sulfur recovery with significant cost and energy saving. The SO2 gas is recycled from the SO2 recovery unit to the sulfur recovery unit by using one of the regenerable solvent.
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: May 14, 2013
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Patent number: 8425874
    Abstract: The reduction of the gas stream containing sulfur dioxide to elemental sulfur is carried out by reacting a reducing gas, such as natural gas, methanol or a mixture of hydrogen and carbon monoxide, with recycled sulfur and recycled tail gas to produce a stream containing hydrogen sulfide that may be reacted with the gas stream that contains sulfur dioxide. Gas streams with a molar concentration of sulfur dioxide from 1 to 100% may be processed to achieve nearly 100% sulfur recovery efficiency.
    Type: Grant
    Filed: June 4, 2011
    Date of Patent: April 23, 2013
    Assignee: Rameshni & Associates Technology & Engineering
    Inventors: Mahin Rameshni, Stephen L Santo
  • Patent number: 8377402
    Abstract: Oxidative and reductive methods are described for the cost-effective destruction of an ammonia-bearing gas stream, potentially containing minor but significant quantities of hydrogen sulfide (H2S), in a conventional Claus sulfur recovery tail gas treating unit, using controlled rates and compositions of combustion gases in order to obtain the temperatures necessary for the desired destruction of unwanted combustibles.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: February 19, 2013
    Assignee: WorleyParsons Group, Inc.
    Inventor: Mahin Rameshni
  • Publication number: 20120321548
    Abstract: Processes for the thermal reduction of sulfur dioxide to elemental sulfur are described and disclosed. The processes described include three general reaction sections, including the reaction furnace portion where the SO2-containing stream is combusted, the second reaction zone where the temperature is moderated to encourage the reaction of sulfur with hydrogen to consume the hydrogen carbon monoxide and produce the H2S and CO with allowing adequate residence time. The temperature moderation is achieved by one or combinations of three different methods adding external waste heat boiler, followed by carbon steel refractory vessel to provide adequate residence time for the reaction of producing H2S or to recycle the tail gas to a second zone of a 2-zone reaction furnace, using inter-stage internal cooling coil or adding a quench fluid in the second zone of a 2-zone reaction furnace.
    Type: Application
    Filed: June 20, 2011
    Publication date: December 20, 2012
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Publication number: 20120308474
    Abstract: The reduction of the gas stream containing sulfur dioxide to elemental sulfur is carried out by reacting a reducing gas, such as natural gas, methanol or a mixture of hydrogen and carbon monoxide, with recycled sulfur and recycled tail gas to produce a stream containing hydrogen sulfide that may be reacted with the gas stream that contains sulfur dioxide. Gas streams with a molar concentration of sulfur dioxide from 1 to 100% may be processed to achieve nearly 100% sulfur recovery efficiency.
    Type: Application
    Filed: June 4, 2011
    Publication date: December 6, 2012
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Patent number: 7927577
    Abstract: Systems and methods for the collection of liquid sulfur with integrated degassing are described, wherein the system and methods include the use of one or more liquid jet pumps or eductors employing a pumped liquid sulfur recycle stream as motive fluid to boost sulfur rundown pressure. The new invention eliminates piping constraints inherent with conventional gravity flow, thus permitting location of the sulfur collection vessel above ground and remote from the sulfur recovery unit. In addition, the described methods provide entrainment and enough agitation in the liquid sulfur such that simultaneously degassing occurs within the sulfur collection piping and associated systems described herein. The instant systems and methods are integrated with the degassing system, meaning that the sulfur will be initially degassed during the collection process, and then further degassing occurs by the methods described herein.
    Type: Grant
    Filed: January 12, 2010
    Date of Patent: April 19, 2011
    Assignee: Worleyparsons Group, Inc.
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Patent number: 7824638
    Abstract: This disclosure relates generally to processes for efficient incineration and conversion of the tail gas streams from sulfur recovery units containing sulfur compounds such as H2S, CO2, COS, CS2, and other sulfur species and sulfur vapors from S1 to S8 to SO2. The present disclosure describes the use of a combination of catalysts to achieve efficient oxidation of all reduced sulfur compounds as well as oxidation of CO and H2 to meet the industry emission requirements. The catalytic tail gas incineration process described herein can advantageously operate at lower temperatures, which in turn can represent a savings in reduced fuel gas costs.
    Type: Grant
    Filed: March 4, 2009
    Date of Patent: November 2, 2010
    Assignee: Worleyparsons Group, Inc.
    Inventors: Mahin Rameshni, Stephen Santo