| Patent |
Date |
Inventors |
Title/Abstract |
US2010/0119427
(Application) |
2010-05-13 |
N. Suchak |
Process for Removing
Contaminants from Gas Streams
The present invention provides for process for inhibiting the levels of nitrogen oxides in
process gas stream from sulfuric acid regeneration and production plants. The
process gas stream from the waste heat boiler and the candle mist eliminator is contacted
with ozone which will react with nitrogen oxides present in the flue gas. |
| US 7497998 |
2009-03-03 |
E. Tabak |
Gas Converter
A converter having an exterior shell with a central axis, at least one gas inlet and at
least one gas outlet. The exterior shell includes a base and an interior support
structure. A number of vertically stacked catalytic chambers within the exterior shell are
each in communication with one or more gas inlets and gas outlets. Each chamber is defined
by an inner wall of the external shell, a permeable catalytic bed support platform, a
lower division plate spaced below the platform defining a gas retention plenum and an
upper division plate above the platform. At least one of: the platform; the upper division
plate; and the lower division plate have a toroid surface symmetric about the central axis
with an outer periphery supported by the inner wall of the exterior shell and an inner
periphery supported by the interior support structure. |
| US 7481865 |
2009-01-27 |
H. Peltola
P. Taskinen
H. Takala
J. Nyberg
H. Natunen
J. Panula |
Method for Removing
Mercury from Gas
The invention relates to a method for the removal of mercury from gas containing sulphur
dioxide and oxygen and from the sulphuric acid vapour contained in the gas. According to
the method, the gas is washed with a water solution that contains selenium ions, whereby
metallic selenium is formed in the presence of oxygen, which precipitates the mercury in
the gas and vapour either as a selenide or in a chlorine-containing environment, as a
dichloride of mercury and selenium. Gas washing occurs at a low temperature, below 50° C.
|
US2008/0311016
(Application) |
2008-12-18 |
S. Maekawa
S. Kawabata
K. Orita |
Process for Disposing
Waste Gas Comprising Sulfur Oxides and Apparatus Thereof
A method for enlarging the particle diameters of sulfuric acid mists in waste gas and
collecting the sulfuric acid mists in high efficiency is provided. A process for disposing
waste gas containing sulfur oxides that introduces the waste gas in dry type electrostatic
precipitator to remove dusts and then introduces the waste gas in a wet desulfurization
apparatus to carry out desulfurization, wherein the waste gas temperature of a smoke
channel at a more upstream side than the wet desulfurization apparatus is measured, the
flow channel length is variable based on the measurement value of the waste gas
temperature, the waste gas is flown to a flow channel means that is adjusted at a channel
length capable of cooling the waste gas to the dew point of acid by heat release and then,
the waste gas is introduced into the wet desulfurization apparatus. |
US2008/0293979
(Application) |
2008-11-27 |
K. Kaeppler,
R. Iretzberger,
G. Nagy |
Process for the
Regeneration of Sulfuric Acid
Sulfuric acid contaminated with byproducts of chloromethane scrubbing is
regenerated for reuse in the scrubbing process by diluting with water to not lower than
about a 55 weight percent concentration, heating the diluted acid to boiling at not more
than about 135° C., concentrating the acid to a concentration of minimally 80 weight
percent at a temperature of at least 170° C., and reacting the concentrated acid with an
oxidizing agent. |
US2008/0264250
(Application) |
2008-10-30 |
H.A. Pfeffer
W.C. Copenhafer |
Flue Gas Desulfurization
Process Utilizing Hydrogen Peroxide
A flue gas desulfurization process in which a SO2-containing flue gas stream is
contacted with a recirculating stream of an aqueous medium containing concentrated
sulfuric acid and hydrogen peroxide, to yield a desulfurized flue gas stream and to
produce additional sulfuric acid in the aqueous medium. A portion of the recirculating
aqueous sulfuric acid stream is diverted for recovery of the additional sulfuric acid as
gypsum in a neutralization step, and the process parameters are adjusted so that the heat
of reaction generated during the neutralization step is sufficient to evaporate the free
water that is present and yield a gypsum product that is substantially dry. |
US2008/0237129
(Application)
|
2008-10-02 |
B.S. Minhas
D.G. Peiffer
J.S. Beck
D.L. Stern
T.R. Melli |
Regeneration of Sulfuric
Acid
This invention relates to a process for recycling acid used to remove nitrogen
contaminants from hydrocarbons using polymeric membranes to separate spent acid from the
acid extraction of hydrocarbons into acid for recycle and acid for regeneration. |
US2008/0253957
(Application) |
2008-10-16 |
K.-H. Daum
W.-C. Rauser |
Process and Plant for
Producing Sulfuric Acid
There are described a process and a plant for producing sulfuric acid by
catalytic oxidation of SO2 to SO3 and subsequent absorption of SO3 in sulfuric acid,
wherein the SO3 is introduced into a first absorption stage and absorbed there in
concentrated sulfuric acid, wherein the sulfuric acid having a higher concentration due to
the absorption is passed through a heat exchanger and cooled, and wherein the non-absorbed
SO3 is supplied to a second absorption stage for the further absorption in sulfuric acid.
Before the first absorption stage a partial stream of SO3 is branched off and supplied
directly to the second absorption stage. |
US2008/0226540
(Application) |
2008-09-18 |
T.R. Felthouse
A. Bino |
Ruthenium Oxide Catalysts
for Conversion of Sulfur Dioxide to Sulfur Trioxide
The present invention relates generally to catalysts comprising ruthenium oxide
and to processes for catalyzing the oxidation and conversion of sulfur dioxide (SO2) to
sulfur trioxide (SO3) using such catalysts. SO2 at low concentrations in process gas
streams can be effectively oxidized to SO3 at relatively low temperatures using the
ruthenium oxide catalysts of the present invention. In one application, the ruthenium
oxide catalysts are used in the final contact stage for conversion of SO2 to SO3 in
multiple stage catalytic converters used in sulfuric acid manufacture. |
US2008/0199379
(Application) |
2008-08-21 |
T. Bogenstatter
W. Gmeiner
V. Fattinger
W. Jaeger |
Method and Device For
Removing Sulphur Dioxide From a Dry Gas Stream
The invention relates to a method for removing sulfur dioxide from a dry gas
stream which comprises following steps:(a) adding a
hydrogen-peroxide-comprising liquid to the gas stream, sulfuric acid forming from the
hydrogen peroxide and the sulfur dioxide and
(b) condensing, absorbing or aerosol precipitation of the sulfuric acid formed.
The admixed hydrogen-peroxide-comprising liquid is mixed
with the dry gas stream in the course of less than 0.3 s in such a manner that the admixed
liquid is essentially homogeneously distributed in the gas stream. Furthermore, the
invention relates to an apparatus for removing sulfur dioxide from a dry gas stream which
comprises at least one atomizing nozzle for adding the hydrogen-peroxide-comprising liquid
and a filter or aerosol separator, arranged downstream, in the direction of flow of the
gas stream, of the at least one atomizing nozzle, in each case at least one atomizing
nozzle being arranged on a cross sectional area of 300 to 350 cm2. |
US2008/0166256
(Application) |
2008-07-10 |
S. Sakamoto
S. Nishimura
A. Usami |
Steel Excellent in
Resistance to Sulfuric Acid Dew Point Corrosion
The present invention provides a steel material able to secure a superior
corrosion resistance in a sulfuric acid dew point corrosive environment of exhaust gas
obtained by burning high S-containing fuel, containing, by mass %, C: =0.010%, Si: =0.10%,
Cu: 0.05 to 1.00%, P: =0.030%, S: =0.050%, and Al: =0.10% and comprising a balance of Fe
and unavoidable impurities. Further, this steel contains one type or two types or more of
Sb, Sn, Cr, Mn, Mo, Ni, Nb, V, Ti, and B. |
US
2008/0145290
(Application) |
2008-06-19 |
K.-H. Daum
H. Storch
J. Rieder |
Process and Plant for
Producing Sulfuric Acid from Gases Rich in Sulfur Dioxide |
| US 7361326 |
2008-04-22 |
K.A. Christensen |
Process for the Production
of Sulfuric Acid
A process of producing sulfuric acid from feed gases
containing 0.1-30% SO2. The process produces concentrated sulfuric acid from a
feed gas containing 0.1 vol % to 30 vol % SO2, in particular a strong feed gas
containing 6 vol % to 30 vol % SO2, that enables the gas entering the final wet
condensing stage to have an acid dew point of below 260°C., while at the same time
achieving current requirements of acid mist emissions of about 20 ppmv without resorting
to substantial air dilution of the strong feed gas. |
US 2008/0056983
(Application) |
2008-03-06 |
M. Curren
B. Foody
J. Tolan |
Process for
Producing Ammonia and Sulfuric Acid from a Stream Comprising Ammonium Sulfate |
US 2008/0063593
(Application) |
2008-03-13 |
L.A. Smith
A.P. Gelbein |
Low
Temperature Process for Regenerating Spent Sulfuric Acid |
| US 7344692 |
2008-03-18 |
L.A. Smith, Jr.
A.P. Gelbein |
Process for
Regenerating Spent Sulfuric Acid
A process for the regeneration of sulfuric acid contaminated with hydrocarbons
and water to produce pure concentration acid comprising: contacting sulfuric acid
contaminated with hydrocarbons and water with oxygen and elemental sulfur in the presence
of a vanadium containing catalyst in a reaction zone, maintaining at least a portion of
the acid in the liquid phase, converting hydrocarbon to carbon oxides and water, and
converting sulfur and sulfurdioxide to sulfurtrioxide, separating the reactor effluent
into a vapor stream and a liquid stream and cooling and partially condensing of the vapor
stream to concentrate clean acid. |
US2008/0025911
(Application) |
2008-01-31 |
J.W. Van Groenestijn
J.H.O. Hazewinkel
R.J.M. Creusen
K.P.H. Meesters |
Recovery of Sulphuric Acid
The invention is directed to a process for the recovery of sulphuric acid from a
mixture comprising sulphuric acid and hydrocarbons, in particular carbohydrates. In
accordance with the present invention the mixture comprising sulphuric acid and
carbohydrates, is contacted with an anion selective membrane, thus producing a sulphuric
acid rich filtrate stream and a stream depleted in sulphuric acid. |
US
2008/0025910
(Application) |
2008-01-31 |
R.N. O’Brien |
Process to Make Both
Nitirc and Sulfuric Acid |
