Patents by Inventor Xiaoliang Gao

Xiaoliang Gao 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).

  • Trimerization
    Patent number: 8252955
    Abstract: A new P—N—P ligand is useful in ethylene oligomerizations. In combination with i) a source of chromium and ii) an activator such as methylalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes. The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: August 28, 2012
    Assignee: NOVA Chemicals (International) S.A.
    Inventors: Xiaoliang Gao, Charles Ashton Garret Carter, Lee Douglas Henderson
  • Tetramerization ligands
    Publication number: 20120088933
    Abstract: An ethylene oligomerization catalyst which contains a bridged diphosphine ligand having the formula (R1)m(X1)nP1-bridge-P2(R2)X2 wherein R1 and R2 are independently selected from the group consisting of hydrocarbyl and heterohydrocarbyl; X1 is selected from the group consisting of halogen, hydrocarbyl and heterohydrocarbyl; m is 1 or 2; n is 0 or 1; m+n=2; bridge is a divalent bridging group bonded to P1 and P2; and X2 is halogen. The present ligands differ from prior diphosphine ligands used in olefin oligomerization processes in that at least one halide substituent is directly bonded to at least one P atom of the ligand.
    Type: Application
    Filed: September 21, 2011
    Publication date: April 12, 2012
    Inventors: Charles Ashton Garret Carter, Xiaoliang Gao
  • Reduced reactor fouling
    Publication number: 20110288248
    Abstract: Fouling in a dispersed phase reactor in the presence of a phosphinimine catalyst and MAO may be reduced by reducing the loading of the phosphinimine catalyst to provide from 0.02 to 0.031 mmol of transition M per g of catalyst while still maintaining a productivity of not less than 2500 g of polymer/gram of catalyst. The catalyst may optionally be used in the presence of an antistatic agent.
    Type: Application
    Filed: May 16, 2011
    Publication date: November 24, 2011
    Inventors: Xiaoliang Gao, Benjamin Milton Shaw, Cliff Robert Baar
  • Amino phosphine
    Publication number: 20110257352
    Abstract: A new P-N-P ligand in which each phosphorus atom is bonded to two ortho-fluorine substituted phenyl groups is useful in ethylene oligomerizations. In combination with i) a source of chromium and ii) an activator such as methalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes. The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions.
    Type: Application
    Filed: June 24, 2011
    Publication date: October 20, 2011
    Inventors: Xiaoliang Gao, Charles Ashton Garret Carter, Liangyou Fan, Lee Douglas Henderson
  • Amino phosphine
    Patent number: 7994363
    Abstract: A new P-N-P ligand in which each phosphorus atom is bonded to two ortho-fluorine substituted phenyl groups is useful in ethylene oligomerizations. In combination with i) a source of chromium and ii) an activator such as methalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes. The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: August 9, 2011
    Assignee: Nova Chemicals (International) S.A
    Inventors: Xiaoliang Gao, Charles Ashton Garret Carter, Liangyou Fan, Lee Douglas Henderson
  • Reactor continuity
    Publication number: 20110092654
    Abstract: Single site reactor/catalyst continuity in a dispersed phase reaction in terms of initial activation and subsequent deactivation may be improved by treating the support with a metal salt. The activator and catalyst are then deposited on the treated support. The resulting catalyst has a lower consumption of ethylene during initiation and a lower rate of deactivation. Preferably the catalyst is used with an antistatic agent.
    Type: Application
    Filed: October 14, 2010
    Publication date: April 21, 2011
    Inventors: Xiaoliang Gao, Billy Gaspar Santos, Peter Phung Minh Hoang, Amy Marie Jones, Benjamin Milton Shaw, Ian Ronald Jobe
  • Tetramerization
    Patent number: 7906681
    Abstract: A new P—N—P ligand is useful in ethylene oligomerizations. In combination with i) a source of chromium and ii) an activator such as methylalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes. The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions.
    Type: Grant
    Filed: September 20, 2010
    Date of Patent: March 15, 2011
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Xiaoliang Gao, Charles Ashton Garret Carter, Lee Douglas Henderson
  • TETRAMERIZATION
    Publication number: 20110015061
    Abstract: A new P—N—P ligand is useful in ethylene oligomerizations. In combination with i) a source of chromium and ii) an activator such as methylalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes. The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions.
    Type: Application
    Filed: September 20, 2010
    Publication date: January 20, 2011
    Inventors: Xiaoliang Gao, Charles Ashton Garret Carter, Lee Douglas Henderson
  • Tetramerization
    Patent number: 7829749
    Abstract: A new P-N-P ligand is useful in ethylene oligomerizations. In combination with i) a source of chromium and ii) an activator such as methylalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes. The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: November 9, 2010
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Xiaoliang Gao, Charles Ashton Garret Carter, Lee Douglas Henderson
  • Catalytic cracking of ethers to 1-olefins
    Patent number: 7700817
    Abstract: The current invention provides a process in which ethers are converted into ?-olefins by passage over a modified alumina catalyst. The alumina catalyst is made by treating gamma-alumina with a rare earth metal oxide such as lanthanum oxide, La2O3. The modified aluminum catalysts convert 1-methoxyoctane into 1-octene with high selectivity at high conversion rates.
    Type: Grant
    Filed: January 30, 2008
    Date of Patent: April 20, 2010
    Assignee: NOVA Chemicals (International) S.A.
    Inventors: Xiaoliang Gao, Stacy David Ross Johnston
  • Tetramerization
    Publication number: 20100081777
    Abstract: A new P—N—P ligand is useful in ethylene oligomerizations. In combination with i) a source of chromium and ii) an activator such as methylalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes. The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions.
    Type: Application
    Filed: September 1, 2009
    Publication date: April 1, 2010
    Inventors: Xiaoliang Gao, Charles Ashton Garret Carter, Lee Douglas Henderson
  • Trimerization
    Publication number: 20100081842
    Abstract: A new P—N—P ligand is useful in ethylene oligomerizations. In combination with i) a source of chromium and ii) an activator such as methylalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes. The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions.
    Type: Application
    Filed: September 1, 2009
    Publication date: April 1, 2010
    Inventors: Xiaoliang Gao, Charles Ashton Garret Carter, Lee Douglas Henderson
  • INTELLIGENT TERMINAL AND METHOD FOR MANAGING INTELLIGENT TERMINAL SYSTEM
    Publication number: 20090228877
    Abstract: A management method for an intelligent terminal system includes: starting the management function of the intelligent terminal system, acquiring an extension software package, verifying the acquired extension software package, executing functions of the extension software package if the verification is passed. An intelligent terminal is further disclosed in the present invention.
    Type: Application
    Filed: May 11, 2009
    Publication date: September 10, 2009
    Applicant: Huawei Technologies Co., Ltd..
    Inventors: Gan DUAN, Guoqiao CHEN, Chenxi WANG, Qiuyang WEI, Lei CHEN, Xiaoliang GAO
  • Microorganism and the process for preparation of pravastatin sodium
    Patent number: 7582464
    Abstract: The invention provides a novel microorganism producing pravastatin sodium, as well as the method for producing pravastatin sodium by using this microorganism. Micropolyspora roseoalba CGMCC 0624 of the invention is highly tolerant to mevastatin sodium, and has a high transformation rate of mevastatin sodium, and can produce pravastatin sodium with a high efficiency and low cost.
    Type: Grant
    Filed: January 6, 2006
    Date of Patent: September 1, 2009
    Assignee: Shanghai Techwell Biopharmaceutical Co., Ltd
    Inventors: Mingquan Mei, Xiaoming Ji, Xiaoliang Gao, Yi Chen, Yan Li, Yong Yao, Zhonghao Zhuo, Jing Xu
  • Cracking 1-ethers over unmodified ?-alumina
    Patent number: 7576250
    Abstract: 1-Ethers may be cracked over untreated ?-alumina having a pore volume of more than 1.0 cc/g and an average pore diameter of more than 150 angstroms (?) at a temperature from 250 to 350° C. and a pressure from 10 to 200 kPa at high conversions and good selectivity to produce the corresponding 1-alkene. The process is particularly useful to produce 1-octene from 1-methoxyoctane.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: August 18, 2009
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Xiaoliang Gao, Andrzej Krzywicki, Stacy David Ross Johnston, Alexandra Kalivoda
  • Conversion of ethers to olefins
    Patent number: 7442845
    Abstract: Ethers are cracked to olefins using a gamma-alumina catalyst in the presence of ammonia. The use of ammonia improves the selectivity to linear alpha olefins in comparison to cracking reactions in the absence of ammonia. The use of ammonia is convenient in comparison to known processes which employ alumina which as been treated with an amine. A preferred process produces octene-1 from 1-methoxyoctane.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: October 28, 2008
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Xiaoliang Gao, Andrzej Krzywicki, Stacy David Ross Johnston
  • Amino phosphine
    Publication number: 20080242811
    Abstract: A new P—N—P ligand in which each phosphorus atom is bonded to two ortho-fluorine substituted phenyl groups is useful in ethylene oligomerizations. In combination with i) a source of chromium and ii) an activator such as methalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes. The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions.
    Type: Application
    Filed: March 20, 2008
    Publication date: October 2, 2008
    Inventors: Xiaoliang Gao, Charles Ashton Garret Carter, Liangyou Fan, Lee Douglas Henderson
  • Catalytic cracking of ethers to 1-olefins
    Publication number: 20080194899
    Abstract: The current invention provides a process in which ethers are converted into ?-olefins by passage over a modified alumina catalyst. The alumina catalyst is made by treating gamma-alumina with a rare earth metal oxide such as lanthanum oxide, La2O3. The modified aluminum catalysts convert 1-methoxyoctane into 1-octene with high selectivity at high conversion rates.
    Type: Application
    Filed: January 30, 2008
    Publication date: August 14, 2008
    Inventors: Xiaoliang Gao, Stacy David Ross Johnston
  • Cracking 1-ethers over unmodified gamma-alumina
    Publication number: 20070203381
    Abstract: 1-Ethers may be cracked over untreated ?-alumina having a pore volume of more than 1.0 cc/g and an average pore diameter of more than 150 angstroms (?) at a temperature from 250 to 350° C. and a pressure from 10 to 200 kPa at high conversions and good selectivity to produce the corresponding 1-alkene. The process is particularly useful to produce 1-octene from 1-methoxyoctane.
    Type: Application
    Filed: February 21, 2007
    Publication date: August 30, 2007
    Inventors: Xiaoliang Gao, Andrzej Krzywicki, Stacy David Ross Johnston, Alexandra Kalivoda
  • Borate activator
    Patent number: 7214744
    Abstract: A catalyst system comprising (i) a bulky ligand catalyst compound; and (ii) a novel borate activator is active for olefin polymerization. The novel borate contains at least one chelating (divalent) ligand and contains at least one fluorine atom. Preferred borate activators are provided as anilinium or carbonium salts. Highly preferred borate salts contain two perfluorinated alkoxy chelating ligands. The catalyst system may be used to produce polyethylene for “end use” applications such as polyethylene film and molded polyethylene goods.
    Type: Grant
    Filed: June 22, 2005
    Date of Patent: May 8, 2007
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Xiaoliang Gao, Isam Jaber