Patents Assigned to Toyo Engineering Corporation
  • Publication number: 20210131728
    Abstract: To provide a process for separating hydrocarbons capable of recovering ethane or propane, including improved cold heat recovery enabling a reduction in compressor power.
    Type: Application
    Filed: November 4, 2020
    Publication date: May 6, 2021
    Applicant: TOYO ENGINEERING CORPORATION
    Inventors: Keisuke SASAKURA, Taisei YAMAMOTO, Shoichi YAMAGUCHI
  • Publication number: 20210063084
    Abstract: A process for obtaining a product gas and product LNG having pressure P1 close to the atmospheric pressure from lean LNG, includes: a) branching the lean LNG to obtain a first flow and a second flow; b) cooling the second flow by using a refrigerant; c) branching a liquid flow derived from the cooled second flow to obtain refrigerant LNG and remaining LNG; d) subjecting the remaining LNG to pressure reduction and gas-liquid separation to obtain a gas phase flow and a liquid phase flow (product LNG) having pressure P1; e) subjecting the refrigerant LNG to pressure reduction; f) using a flow from the step e as the refrigerant; g) joining, before or after the step f, the gas phase flow having pressure P1 to a flow from the step e; h) liquefying a flow resulting from the steps f and g by pressure increase and cooling (through heat exchange with the first flow); i) increasing the first flow in pressure before the step h; j) obtaining the product gas by regasifying the first flow after the steps h and i; and k) joi
    Type: Application
    Filed: August 12, 2020
    Publication date: March 4, 2021
    Applicant: TOYO ENGINEERING CORPORATION
    Inventors: Taisei YAMAMOTO, Yasuyuki YAMAMORI
  • Patent number: 10894764
    Abstract: Precipitation of an ammonium salt is prevented while suppressing an increase in water content of the aqueous urea solution which is to be supplied to a urea granulation step, when recovering and using urea and NH3 in a gas which contains urea dust and NH3 and which arises from a urea granulation step.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: January 19, 2021
    Assignee: TOYO ENGINEERING CORPORATION
    Inventors: Shuhei Nakamura, Akiko Sugiura, Keigo Sasaki
  • Publication number: 20210001245
    Abstract: Diabatic distillation column 1 includes first and second cooling devices 11, 12 configured to indirectly cool fluid in rectifying section 2 with a circulating working fluid, first and second heating devices 21, 22 configured to indirectly heat fluid in stripping section 3 with the circulating working fluid, first compressor 31 configured to compress the working fluid from first cooling device 11 on first circulation path P11-P14 between first cooling device 11 and first heating device 21, second compressor 32 configured to compress the working fluid from second cooling device 12 on second circulation path P21-P24 between second cooling device 12 and second heating device 22, first expansion device 41 configured to expand the working fluid from first heating device 21 on first circulation path P11-P14, and second expansion device 42 configured to expand the working fluid from second heating device 22 on second circulation path P21-P24.
    Type: Application
    Filed: November 30, 2018
    Publication date: January 7, 2021
    Applicant: TOYO ENGINEERING CORPORATION
    Inventors: Toshihiro WAKABAYASHI, Masaki TOGO
  • Patent number: 10739038
    Abstract: The present invention provides a solar heat collecting device having good heat collection efficiency. A uniaxial solar-tracking reflective mirror group is arranged such that each longitudinal axis thereof faces the same direction. A first biaxial solar-tracking reflective mirror group and a second biaxial solar-tracking reflective mirror group are arranged lined up in a direction orthogonal to the longitudinal axis direction of uniaxial solar-tracking reflective mirrors. The uniaxial solar-tracking reflective mirror group is arranged so as to be sandwiched on both sides by the first biaxial solar-tracking reflective mirror group and the second biaxial solar-tracking reflective mirror group. Each mirror group sends solar heat received during uniaxial or biaxial tracking in accordance with the position of the sun, to a heat collecting device.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: August 11, 2020
    Assignee: TOYO ENGINEERING CORPORATION
    Inventors: Yoshinobu Kato, Kiyoshi Satake
  • Patent number: 10730761
    Abstract: Disclosed are: a treatment method comprising (1) a step in which an aqueous solution containing urea, ammonia and carbon dioxide is introduced into a first stripper (PCS1) and subjected to stripping, and the aqueous solution after stripping is introduced into a urea hydrolyzer (UHY), (2) a step in which urea in the aqueous solution is hydrolyzed in the urea hydrolyzer (UHY), and the aqueous solution after hydrolysis is introduced into a second stripper (PCS2), (3) a step in which the aqueous solution is subjected to stripping in the second stripper (PCS2), and (4) a step in which a part of the aqueous solution before being stripped in the first stripper (PCS1), and/or, a part of the aqueous solution after being stripped in the first stripper (PCS1) but before being hydrolyzed in the urea hydrolyzer (UHY) is introduced into an exhaust gas treatment equipment equipped with an ammonia scrubbing equipment (ASCR); and a treatment equipment therefor.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: August 4, 2020
    Assignee: TOYO ENGINEERING CORPORATION
    Inventor: Keigo Sasaki
  • Publication number: 20200172475
    Abstract: Provided are urea manufacturing method and apparatus, which can increase the conversion ratio into urea and to reduce the consumption of steam. The temperature of the reactor is increased by introducing the entire amount of raw material ammonia and introducing a portion of the decomposed gas from the stripper into the reactor. The raw material ammonia is preferably heated using the steam condensate generated in the purification step, and/or the steam generated by the heat of condensation of the decomposed gas and the unreacted substances in the condensation step. The heating temperature is preferably between 70 and 140° C.
    Type: Application
    Filed: February 12, 2020
    Publication date: June 4, 2020
    Applicant: Toyo Engineering Corporation
    Inventors: Keishi SATO, Kenji YOSHIMOTO, Haruyuki MORIKAWA
  • Patent number: 10604477
    Abstract: Provided are urea manufacturing method and apparatus, which can increase the conversion ratio into urea and to reduce the consumption of steam. The temperature of the reactor is increased by introducing the entire amount of raw material ammonia and introducing a portion of the decomposed gas from the stripper into the reactor. The raw material ammonia is preferably heated using the steam condensate generated in the purification step, and/or the steam generated by the heat of condensation of the decomposed gas and the unreacted substances in the condensation step. The heating temperature is preferably between 70 and 140° C.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: March 31, 2020
    Assignee: TOYO ENGINEERING CORPORATION
    Inventors: Keishi Sato, Kenji Yoshimoto, Haruyuki Morikawa
  • Publication number: 20200064081
    Abstract: Chemical heat pump system 1 includes: endothermic unit 3 that contains a slurry containing a solid product and that absorbs heat supplied from an outside to perform an endothermic reaction at first pressure P1; exothermic unit 2 that contains a slurry containing a solid reactant and that performs an exothermic reaction at a second pressure P2 that is higher than the first pressure P1 to generate heat; gas recovery supply unit 4 that recovers a gas reactant that has been decomposed in endothermic unit 3 and that supplies the gas reactant to exothermic unit 2; and circulation unit 5 that supplies the slurry containing the solid reactant, that has been decomposed in endothermic unit 3, to exothermic unit 2 after pressurizing the slurry from first pressure P1 to second pressure P2, and that supplies the slurry containing the solid product, that has been produced in exothermic unit 2, to endothermic unit 3 after depressurizing the slurry from second pressure P2 to first pressure P1, so as to circulate the slurry b
    Type: Application
    Filed: October 24, 2017
    Publication date: February 27, 2020
    Applicant: TOYO ENGINEERING CORPORATION
    Inventors: Takato NAKAO, Satoshi TERAI
  • Publication number: 20200002274
    Abstract: Precipitation of an ammonium salt is prevented while suppressing an increase in water content of the aqueous urea solution which is to be supplied to a urea granulation step, when recovering and using urea and NH3 in a gas which contains urea dust and NH3 and which arises from a urea granulation step.
    Type: Application
    Filed: March 6, 2018
    Publication date: January 2, 2020
    Applicant: TOYO ENGINEERING CORPORATION
    Inventors: Shuhei NAKAMURA, Akiko USHIFUSA, Keigo SASAKI
  • Patent number: 10519103
    Abstract: The present invention is a urea production method, including: a first concentration step of concentrating an aqueous urea solution; a granulation step of producing solid urea from the concentrated urea solution generated in the first concentration step; a urea recovery step of treating exhaust gas from the granulation step and recovering urea dust in the exhaust gas to generate a recovered aqueous urea solution, the granulation step being configured so as to treat a concentrated urea solution containing an additive; and a second concentration step of concentrating the recovered aqueous urea solution as an additional concentration step, wherein the concentrated recovered urea solution generated in the second concentration step is joined to the concentrated urea solution in the downstream of the first concentration step, and an additive is added downstream of the first concentration step.
    Type: Grant
    Filed: April 1, 2016
    Date of Patent: December 31, 2019
    Assignee: TOYO ENGINEERING CORPORATION
    Inventors: Shuhei Nakamura, Keigo Sasaki
  • Patent number: 10501407
    Abstract: Method and apparatus that enable the more efficient manufacture of urea are provided. Before unreacted substances are removed from a urea synthesis solution obtained from a stripper, the urea synthesis solution is placed under pressure reduced from the synthesis pressure. Thus, a gas-liquid mixture is obtained. The gas-liquid mixture is heated with a decomposed gas from the stripper using a shell-and-tube heat exchanger, and then introduced into a purification system. In the heating, the gas-liquid mixture is introduced into the shell of the heat exchanger while the decomposed gas is introduced into the tube side of the heat exchanger.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: December 10, 2019
    Assignee: Toyo Engineering Corporation
    Inventors: Maghfuri Baharuddin, Genshi Nishikawa, Haruyuki Morikawa
  • Patent number: 10480827
    Abstract: A solar heat collector with high heat collection effect is provided. The solar heat collector includes a first heat collection pipe and a second heat collection pipe. The first heat collection pipe receives reflected light from a single-axial tracking solar type reflective mirror group to collect heat. The second heat collection pipe receives reflected light from the single-axial tracking solar type reflective mirror group and dual-axial tracking solar type reflective mirror groups to collect heat. The second heat collection pipe has an amount of heat collection per unit area larger than the first heat collection pipe. Therefore, compared with the use of only the first heat collection pipe, this ensures obtaining larger energy.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: November 19, 2019
    Assignee: TOYO ENGINEERING CORPORATION
    Inventors: Yoshinobu Kato, Kiyoshi Satake
  • Publication number: 20190264990
    Abstract: Chemical heat storage system 1 based on an exothermic reaction that produces a solid product from a solid reactant and a gas reactant and an endothermic reaction that decomposes the solid product into the solid reactant and the gas reactant, includes: endothermic unit 3 that contains a slurry containing the solid product and that absorbs heat supplied from the outside to perform the endothermic reaction; exothermic unit 2 that contains a slurry containing the solid reactant and that performs the exothermic reaction to generate heat; and gas recovery supply unit 4 that recovers the gas reactant that has been decomposed in endothermic unit 3 and that supplies the gas reactant to exothermic unit 2.
    Type: Application
    Filed: October 24, 2017
    Publication date: August 29, 2019
    Applicant: TOYO ENGINEERING CORPORATION
    Inventors: Takato NAKAO, Satoshi TERAI
  • Publication number: 20190136141
    Abstract: Provided are an apparatus and a method for separation and recovery of propane and heavier hydrocarbons from LNG. The apparatus has, from the upstream side toward the downstream side of LNG supply, first column (3) equipped with first column overhead condenser (2), first column bottom reboiler (4) and side reboiler (5), and second column (14) equipped with second column overhead condenser (11) and second column bottom reboiler (15). The first column (3) separates methane and a part of ethane as an overhead vapor and separates remaining ethane and C3 or higher hydrocarbons as a bottom liquid. The second column (14) separates ethane as an overhead vapor and separates C3 or higher hydrocarbons as a bottom liquid.
    Type: Application
    Filed: October 23, 2018
    Publication date: May 9, 2019
    Applicant: TOYO ENGINEERING CORPORATION
    Inventors: Shoichi YAMAGUCHI, Yasuyuki Yamamori, Xiaoxue Zhang
  • Patent number: 10280094
    Abstract: A method for treating a urea aqueous solution includes a first stripping step of steam stripping an aqueous solution containing urea, ammonia and carbon dioxide at 0.2 to 0.6 MPaA in a first stripper to separate ammonia and carbon dioxide from this aqueous solution into a gas phase; a hydrolysis step of hydrolyzing urea in the solution obtained from the first stripping step at an LHSV of 10 to 20 h?1, at 1.1 to 3.1 MPaA and 180 to 230° C. in a catalytic hydrolyzer; and a second stripping step of steam stripping a liquid obtained in the hydrolysis step in a second stripper to separate ammonia and carbon dioxide from this liquid into a gas phase. The residual urea concentration can be reduced to 1 ppm or lower; the residual ammonia concentration can be decreased; LHSV can be increased; and an increase in apparatus size is minimized.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: May 7, 2019
    Assignee: Toyo Engineering Corporation
    Inventors: Genshi Nishikawa, Yuta Abe, Keiji Sano
  • Publication number: 20190128600
    Abstract: An improved method for separating hydrocarbons for separating feed LNG into product LNG and a liquid fraction enriched in C3+ components is provided.
    Type: Application
    Filed: October 23, 2018
    Publication date: May 2, 2019
    Applicant: Toyo Engineering Corporation
    Inventors: Yasuyuki YAMAMORI, Xiaoxue Zhang
  • Patent number: 10265640
    Abstract: The duty of internal heat exchange can be flexibly adjusted without impairing energy saving performance of a HIDiC. A method of adjusting the duty of heat exchange in a heat exchange structure of a HIDiC includes totally condensing a portion of the vapor fed to a heat exchange structure in a heat exchange structure; and providing a liquid control valve downstream of the heat exchange structure on the first line, without providing a control valve on a vapor-flowing part of first and second lines of the HIDiC, and adjusting a flow rate of a portion of the compressor outlet vapor flowing into the heat exchange structure by using the control valve, while compensating for a pressure loss needed for the control valve by using a liquid head of a condensate, and/or by using pressurization by a pump.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: April 23, 2019
    Assignee: Toyo Engineering Corporation
    Inventors: Takato Nakao, Toshihiro Wakabayashi, Kouichi Tachikawa
  • Patent number: 10173972
    Abstract: The present invention relates to a method for producing a high-purity aqueous urea solution, utilizing a urea production process at least including a urea synthesis step of synthesizing urea from a raw material feed to produce a urea synthesis liquid, and a urea purification step of purifying the urea synthesis liquid to produce an aqueous urea solution with high urea concentration. The present invention includes a urea crystallization step of separating a part of the urea synthesis liquid and/or a part of the aqueous urea solution and crystallizing urea contained in the separated urea synthesis liquid and/or aqueous urea solution to produce solid crystal urea, and a mixing step of mixing the crystal urea with water to produce a high-purity aqueous urea solution. A high-purity aqueous urea solution to be produced is an aqueous urea solution with high purity suitable as a reducing agent for SCR.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: January 8, 2019
    Assignee: TOYO ENGINEERING CORPORATION
    Inventors: Haruyuki Morikawa, Shuhei Nakamura, Keishi Sato
  • Publication number: 20180258033
    Abstract: Method and apparatus that enable the more efficient manufacture of urea are provided. Before unreacted substances are removed from a urea synthesis solution obtained from a stripper, the urea synthesis solution is placed under pressure reduced from the synthesis pressure. Thus, a gas-liquid mixture is obtained. The gas-liquid mixture is heated with a decomposed gas from the stripper using a shell-and-tube heat exchanger, and then introduced into a purification system. In the heating, the gas-liquid mixture is introduced into the shell of the heat exchanger while the decomposed gas is introduced into the tube side of the heat exchanger.
    Type: Application
    Filed: August 31, 2016
    Publication date: September 13, 2018
    Applicant: Toyo Engineering Corporation
    Inventors: Maghfuri BAHARUDDIN, Genshi NISHIKAWA, Haruyuki MORIKAWA