Shih-Ger Chang

7479263, Jan 20, 2009

Apr 7, 2005

11/101713

Shih-ger Chang - El Cerrito CA, US
Shou-heng Liu - Kaohsiung, TW
Zhao-rong Liu - Beijing, CN
Naiqiang Yan - Berkeley CA, US

The Regents of the University of California - Oakland CA

B01D 53/64

423210, 95134

Disclosed herein is a method for removing mercury from a gas stream comprising contacting the gas stream with a getter composition comprising bromine, bromochloride, sulphur bromide, sulphur dichloride or sulphur monochloride and mixtures thereof. In one preferred embodiment the getter composition is adsorbed onto a sorbent. The sorbent may be selected from the group consisting of flyash, limestone, lime, calcium sulphate, calcium sulfite, activated carbon, charcoal, silicate, alumina and mixtures thereof. Preferred is flyash, activated carbon and silica.

7754170, Jul 13, 2010

Jan 16, 2009

12/355151

Shih-ger Chang - El Cerrito CA, US
Shou-heng Liu - Kaohsiung, TW
Zhao-rong Liu - Bejing, CN
Naiqiang Yan - Burkeley CA, US

The Regents of the University of California - Oakland CA

B01D 53/64

423210, 95134

Disclosed herein is a method for removing mercury from a gas stream comprising contacting the gas stream with a getter composition comprising bromine, bromochloride, sulphur bromide, sulphur dichloride or sulphur monochloride and mixtures thereof. In one preferred embodiment the getter composition is adsorbed onto a sorbent. The sorbent may be selected from the group consisting flyash, limestone, lime, calcium sulphate, calcium sulfite, activated carbon, charcoal, silicate, alumina and mixtures thereof. Preferred is flyash, activated carbon and silica.

8007749, Aug 30, 2011

Jun 2, 2010

12/792135

Shih-Ger Chang - El Cerrito CA, US
Shou-Heng Liu - Kaohsiung, TW
Zhao-Rong Liu - Beijing, CN
Naiqiang Yan - Berkeley CA, US

The Regents of the University of Calfornia - Oakland CA

B01D 53/64

423210, 95134

Disclosed herein is a method for removing mercury from a gas stream comprising contacting the gas stream with a getter composition comprising bromine, bromochloride, sulphur bromide, sulphur dichloride or sulphur monochloride and mixtures thereof. In one preferred embodiment the getter composition is adsorbed onto a sorbent. The sorbent may be selected from the group consisting of flyash, limestone, lime, calcium sulphate, calcium sulfite, activated carbon, charcoal, silicate, alumina and mixtures thereof. Preferred is flyash, activated carbon and silica.

20010000475, Apr 26, 2001

Dec 5, 2000

09/729366

Yun Jin - Peking, CN
Qiquan Yu - Peking, CN
Shih-Ger Chang - El Cerrito CA, US

B05D003/02

427/226000

A highly efficient sulfide catalyst for reducing sulfur dioxide to elemental sulfur, which maximizes the selectivity of elemental sulfur over byproducts and has a high conversion efficiency. Various feed stream contaminants, such as water vapor are well tolerated. Additionally, hydrogen, carbon monoxide, or hydrogen sulfides can be employed as the reducing gases while maintaining high conversion efficiency. This allows a much wider range of uses and higher level of feed stream contaminants than prior art catalysts.

20130139695, Jun 6, 2013

Feb 1, 2013

13/757550

Shih-Ger Chang - El Cerrito CA, US
Yang Li - El Cerrito CA, US
Xinglei Zhao - Albany CA, US

The Regents of The University of California - Oakland CA

B01D 53/14

96235

The present invention provides a system for capturing COand/or SO, comprising: (a) a COand/or SOabsorber comprising an amine and/or amino acid salt capable of absorbing the COand/or SOto produce a CO- and/or SO-containing solution; (b) an amine regenerator to regenerate the amine and/or amino acid salt; and, when the system captures CO, (c) an alkali metal carbonate regenerator comprising an ammonium catalyst capable catalyzing the aqueous alkali metal bicarbonate into the alkali metal carbonate and COgas. The present invention also provides for a system for capturing SO, comprising: (a) a SOabsorber comprising aqueous alkali metal carbonate, wherein the alkali metal carbonate is capable of absorbing the SOto produce an alkali metal sulfite/sulfate precipitate and CO.

51641674, Nov 17, 1992

Oct 24, 1988

7/261229

Shih-Ger Chang - El Cerrito CA
David K. Liu - San Pablo CA

Regents of the University of California - Berkeley CA

B01D 5334

423235

Exhaust gases are treated to remove NO or NO. sub. x and SO. sub. 2 by contacting the gases with an aqueous emulsion or suspension of yellow phosphorus preferably in a wet scrubber. The pressure is not critical, and ambient pressures are used. Hot water temperatures are best, but economics suggest about 50. degree. C. are attractive. The amount of yellow phosphorus used will vary with the composition of the exhaust gas, less than 3% for small concentrations of NO, and 10% or higher for concentrations above say 1000 ppm. Similarly, the pH will vary with the composition being treated, and it is adjusted with a suitable alkali. For mixtures of NO. sub. x and SO. sub. 2, alkalis that are used for flue gas desulfurization are preferred. With this process, 100% of the by-products created are usable, and close to 100% of the NO or NO and SO. sub. 2 can be removed in an economic fashion.

47327448, Mar 22, 1988

Oct 27, 1986

6/923541

Shih-Ger Chang - El Cerrito CA
David K. Liu - Oakland CA
Elizabeth A. Griffiths - Neston, GB2
David Littlejohn - Oakland CA

The United States of America as represented by the United States
Department of Energy - Washington DC

C01B 2100
C01B 1700

423235

The present invention in one aspect relates to a process for the simultaneous removal of NO. sub. x and SO. sub. 2 from a fluid stream comprising mixtures thereof and in another aspect relates to the separation, use and/or regeneration of various chemicals contaminated or spent in the process and which includes the steps of: (A) contacting the fluid stream at a temperature of between about 105. degree. and 180. degree. C. with a liquid aqueous slurry or solution comprising an effective amount of an iron chelate of an amino acid moiety having at least one --SH group; (B) separating the fluid stream from the particulates formed in step (A) comprising the chelate of the amino acid moiety and fly ash; (C) washing and separating the particulates of step (B) with an aqueous solution having a pH value of between about 5 to 8; (D) subsequently washing and separating the particulates of step (C) with a strongly acidic aqueous solution having a pH value of between about 1 to 3; (E) washing and separating the particulates of step (D) with an basic aqueous solution having a pH value of between about 9 to 12; (F) optionally adding additional amino acid moiety, iron (II) and alkali to the aqueous liquid from step (D) to produce an aqueous solution or slurry similar to that in step (A) having a pH value of between about 4 to 12; and (G) recycling the aqueous slurry of step (F) to the contacting zone of step (A). Steps (D) and (E) can be carried out in the reverse sequence, however the preferred order is (D) and then (E). In another preferred embodiment the present invention provides a process for the removal of NO. sub. x, SO. sub.

48373613, Jun 6, 1989

Nov 18, 1987

7/122725

Shih-Ger Chang - El Cerrito CA
David K. Liu - Oakland CA
Elizabeth A. Griffiths - Morristown NJ
David Littlejohn - Oakland CA

The United States of America as represented by the United States
Department of Energy - Washington DC

C07C14702
C07C14924
C07C149243
C12P 1312

562556

The present invention in one aspect relates to a process for the simultaneous removal of NO. sub. x and SO. sub. 2 from a fluid stream comprising mixtures thereof and in another aspect relates to the separation, use and/or regeneration of various chemicals contaminated or spent in the process and which includes the steps of: (A) contacting the fluid stream at a temperature of between about 105. degree. and 180. degree. C. with a liquid aqueous slurry or solution comprising an effective amount of an iron chelate of an amino acid moiety having at least one --SH group; (B) separating the fluid stream from the particulates formed in step (A) comprising the chelate of the amino acid moiety and fly ash; (C) washing and separating the particulates of step (B) with an aqeous solution having a pH value of between about 5 to 8; (D) subsequently washing and separating the particulates of step (C) with a strongly acidic aqueous solution having a pH value of between about 1 to 3; (E) washing and separating the particulates of step (D) with an basic aqueous solution having a pH value of between about 9 to 12; (F) optionally adding additional amino acid moiety, iron (II) and alkali to the aqueous liquid from step (D) to produce an aqueous solution or slurry similar to that in step (A) having a pH value of between about 4 to 12; and (G) recycling the aqueous slurry of step (F) to the contacting zone of step (A). Steps (D) and (E) can be carried out in the reverse sequence, however the preferred order is (D) and then (E). In a preferred embodiment the present invention provides an improved process for the preparation (regeneration) of cysteine from cystine, which includes reacting an aqueous solution of cystine at a pH of between about 9 to 13 with a reducing agent selected from hydrogen sulfide or alkali metal sulfides, sulfur dioxide, an alkali metal sulfite or mixtures thereof for a time and at a temperature effective to cleave and reduce the cystine to cysteine with subsequent recovery of the cysteine.