Claims
- 1. A method of supplying ozone in a carrier gas under superatmospheric pressure to effect ozone delignification of cellulose pulp in an ozone delignification process practiced in a reactor, utilizing a compressor, comprising the steps of:
- (a) controlling the speed of operation of the compressor so that it compresses as much ozone per unit time at desired superatmospheric pressure as the ozone delignification process utilizes, with essentially no excess;
- (b) feeding the ozone in carrier gas from the compressor essentially directly to the ozone delignification process; and
- (c) sensing the pressure between the compressor and the reactor; and
- wherein step (a) is practiced in response to step (c) and so that the superatmospheric pressure of the ozone is greater than the pressure in the reactor.
- 2. A method as recited in claim 1 wherein the compressor is a water ring compressor, and wherein step (b) is practiced by the substep of separating cooling water and compressed ozone prior to feeding the ozone to the ozone delignification process.
- 3. A method as recited in claim 1 wherein the compressor is a water ring compressor, and wherein steps (a) and (b) are practiced to keep the temperature of the compressed ozone and carrier gas substantially at or below ambient temperature by externally cooling the water utilized in the water ring compressor, and recirculating it to the compressor.
- 4. A method as recited in claim 3 wherein ozone delignification is practiced in a reactor; and comprising the further step (d) of sensing the pressure between the compressor and the reactor; and wherein step (a) is practiced in response to step (d) and so that the superatmospheric pressure of the ozone is greater than the pressure in the reactor.
- 5. A method as recited in claim 1 wherein step (a) is practiced to produce ozone gas at a pressure between 2-20 bar.
- 6. A method of supplying ozone in a carrier gas under superatmospheric pressure to effect ozone delignification of cellulose pulp in an ozone delignification process, utilizing a water ring compressor, comprising the steps of:
- (a) controlling the speed of operation of the compressor so that it produces as much ozone per unit time at desired superatmospheric pressure as the ozone delignification process utilizes, with essentially no excess; and
- (b) feeding the ozone in carrier gas from the compressor essentially directly to the ozone delignification process by (b1) leveling out the pressure pulses from the compressor; and (b2) separating cooling water and compressed ozone gas prior to feeding the ozone gas to the ozone delignification process; and
- wherein substeps (b1) and (b2) are practiced by providing a separator buffer tank between the compressor and the ozone delignification process.
- 7. A method as recited in claim 6 wherein ozone delignification is practiced in a reactor; and comprising the further step (c) of sensing the pressure between the compressor and the reactor; and wherein step (a) is practiced in response to step (c) and so that the superatmospheric pressure of the ozone is greater than the pressure in the reactor.
- 8. A method as recited in claim 6 wherein step (a) is practiced to produce ozone gas at a pressure between 2-20 bar.
Parent Case Info
This is a divisional of application Ser. No. 07/989,932, filed Dec. 7, 1992, now U.S. Pat. No. 5,364,505.
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4255257 |
Greiner et al. |
Mar 1981 |
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5382326 |
Szopinski et al. |
Jun 1995 |
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5403441 |
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Foreign Referenced Citations (1)
Number |
Date |
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511433 |
Nov 1992 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
989932 |
Dec 1992 |
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