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US 10,881,756 B2Granted
Methods and equipment for treatment of odorous gas streams from industrial plants
OwnerStephen R. Templeinventor
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a gas scrubbing process for removing at least one odorous vaporous compound from a gas stream generated by a rendering process or at least reducing the concentration of that odorous vaporous compound. In one embodiment, a series of two gas/liquid contactors is used, each having a different liquid scrubbing solution, with one scrubbing solution controlled at an alkaline pH and the other scrubbing solution controlled at an acidic pH. In another embodiment, the pH of the respective scrubbing solutions in each of the two gas/liquid contactors is reversed.
Claims18
A method for reducing the concentration of at least one odorous compound in a gas stream, comprising:
- passing a gas stream comprising at least one odorous compound through a first gas/liquid contactor;
- contacting said gas stream in said first gas/liquid contactor with a first liquid scrubbing solution;
- passing said gas stream from said first gas/liquid contactor through a second gas/liquid contactor;
- and
- contacting said gas stream in said second gas/liquid contactor with a second liquid scrubbing solution,
- wherein said first liquid scrubbing solution comprises an alkaline liquid scrubbing solution comprising hydrogen peroxide but not a hydrogen peroxide decomposition additive and said second liquid scrubbing solution comprises an acidic liquid scrubbing solution comprising a reaction product of hydrogen peroxide and a hydrogen peroxide decomposition additive, or wherein said first liquid scrubbing solution comprises an acidic liquid scrubbing solution comprising a reaction product of hydrogen peroxide and a hydrogen peroxide decomposition additive and said second liquid scrubbing solution comprises an alkaline liquid scrubbing solution comprising hydrogen peroxide but not a hydrogen peroxide decomposition additive.
3 more elements
A method for reducing the concentration of at least one odorous compound in a gas stream, comprising:
- passing a gas stream comprising at least one odorous compound through a first gas/liquid contactor;
- contacting said gas stream in said first gas/liquid contactor with an acidic liquid scrubbing solution;
- passing said gas stream from said first gas/liquid contactor through a second gas/liquid contactor;
- and
- contacting said gas stream in said second gas/liquid contactor with an alkaline liquid scrubbing solution comprising hydrogen peroxide without a hydrogen peroxide decomposition additive in said second gas/liquid contactor, wherein said acidic liquid scrubbing solution comprises hydrogen peroxide and a hydrogen peroxide decomposition additive.
2 more elements
A method for reducing the concentration of at least one odorous compound in a gas stream, comprising:
- passing a gas stream comprising at least one odorous compound through a first gas/liquid contactor;
- contacting said gas stream in said first gas/liquid contactor with an alkaline liquid scrubbing solution comprising hydrogen peroxide without a hydrogen peroxide decomposition additive;
- passing said gas stream from said first gas/liquid contactor through a second gas/liquid contactor;
- and
- contacting said gas stream in said second gas/liquid contactor with an acidic liquid scrubbing solution in said second gas/liquid contactor, wherein said acidic liquid scrubbing solution comprises hydrogen peroxide and a hydrogen peroxide decomposition additive.
2 more elements
A method for reducing the concentration of at least one odorous compound in a gas stream, comprising:
- passing a gas stream comprising at least one odorous compound through a first gas/liquid contactor;
- contacting said gas stream in said first gas/liquid contactor with a first alkaline liquid scrubbing solution comprising hydrogen peroxide for a first length of time;
- passing said gas stream from said first gas/liquid contactor through a second gas/liquid contactor;
- contacting said gas stream in said second gas/liquid contactor with a first acidic liquid scrubbing solution comprising a reaction product of hydrogen peroxide and a hydrogen peroxide decomposition additive during said first length of time;
- contacting, after said first length of time, said gas stream in said first gas/liquid contactor with a second acidic liquid scrubbing solution comprising hydrogen peroxide and a hydrogen peroxide decomposition additive for a second length of time;
- and
- contacting, after said first length of time, said gas stream in said second gas/liquid contactor with a second alkaline liquid scrubbing solution comprising hydrogen peroxide during said second length of time.
4 more elements
A method for reducing the concentration of at least one odorous compound in a gas stream, comprising:
- passing a gas stream comprising at least one odorous compound through a first gas/liquid contactor;
- contacting said gas stream in said first gas/liquid contactor with a first acidic liquid scrubbing solution comprising a reaction product of hydrogen peroxide and a hydrogen peroxide decomposition additive for a first length of time;
- passing said gas stream from said first gas/liquid contactor through a second gas/liquid contactor;
- contacting said gas stream in said second gas/liquid contactor with a first alkaline liquid scrubbing solution comprising hydrogen peroxide during said first length of time;
- contacting, after said first length of time, said gas stream in said first gas/liquid contactor with a second alkaline liquid scrubbing solution comprising hydrogen peroxide for a second length of time;
- and
- contacting, after said first length of time, said gas stream in said second gas/liquid contactor with a second acidic liquid scrubbing solution comprising hydrogen peroxide and a hydrogen peroxide decomposition additive during said second length of time.
4 more elements
A method for reducing the concentration of at least one odorous compound in a gas stream, comprising:
- passing a gas stream comprising at least one odorous compound through a first gas/liquid contactor;
- contacting said gas stream in said first gas/liquid contactor with an acidic liquid scrubbing solution;
- passing said gas stream from said first gas/liquid contactor through a second gas/liquid contactor;
- and
- contacting said gas stream in said second gas/liquid contactor with an alkaline liquid scrubbing solution comprising hydrogen peroxide without a hydrogen peroxide decomposition additive in said second gas/liquid contactor, wherein after a period of time said contacting in said first gas/liquid contactor is performed using said alkaline scrubbing solution instead of said acidic scrubbing solution and said contacting in said second gas/liquid contactor is performed using said acidic scrubbing solution instead of said alkaline scrubbing solution.
2 more elements
A method for reducing the concentration of at least one odorous compound in a gas stream, comprising:
- passing a gas stream comprising at least one odorous compound through a first gas/liquid contactor;
- contacting said gas stream in said first gas/liquid contactor with an alkaline liquid scrubbing solution comprising hydrogen peroxide without a hydrogen peroxide decomposition additive;
- passing said gas stream from said first gas/liquid contactor through a second gas/liquid contactor;
- and
- contacting said gas stream in said second gas/liquid contactor with an acidic liquid scrubbing solution in said second gas/liquid contactor, wherein after a period of time said contacting in said first gas/liquid contactor is performed using said acidic scrubbing solution instead of said alkaline scrubbing solution and said contacting in said second gas/liquid contactor is performed using said alkaline scrubbing solution instead of said acidic scrubbing solution.
2 more elements
Dependencies are inferred from the claim text.