Sensor technique for black liquor oxidation control
AssigneeInternational Paper Company
InventorsXin-Sheng Chai, Christopher L. Verrill
Life of this patent
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Abstract
A method for determining simultaneously from an oxidized black liquor sample an amount of sulfide, an amount of total dissolved solids, and an amount of effective alkali present in the sample, wherein the sulfide amount, the total dissolved solids amount, and the effective alkali amount are determined by subjecting the sample to attenuated total reflection (ATR) ultraviolet/visible (UV/V) spectroscopy over a wavelength of from about 190 to about 500 nm. Data from analyzing oxidized black liquor samples, and from analyzing one or more black liquor samples which may be subjected to black oxidation, may be used in a black liquor oxidation (BLOX) system for monitoring and/or controlling sulfur emissions from a kraft process.
Claims54
A method comprising the following steps of:
- (a) providing spectroscopy results for one or more samples of oxidized black liquor;
- and
- (b) determining simultaneously from the sample an amount of sulfide, an amount of total dissolved solids, and an amount of effective alkali present in the one or more samples based on the spectroscopy results of step (a), wherein the spectroscopy results are based on subjecting the one or more samples to attenuated total reflection (ATR) ultraviolet/visible (UV/V) spectroscopy over a wavelength of from about 190 to about 500 nm.
A method comprising the following steps of:
- (a) providing from a black liquor oxidation system one or more samples each of:
- (1) oxidized black liquor;
- and (2) black liquor which may be subjected to black liquor oxidation;
- (b) determining simultaneously for each sample an amount of sulfide, an amount of total dissolved solids, and an amount of effective alkali present in each sample based on spectroscopy results for each sample;
- and
- (c) monitoring the black liquor oxidation system based on the sulfide amount, the total dissolved solids amount, and the effective alkali amount determined in step (b), wherein the spectroscopy results are based on subjecting the one or more samples to attenuated total reflection (ATR) ultraviolet/visible (UVN) spectroscopy over a wavelength of from about 190 to about 500 nm.
A system comprising:
- a black liquor stream;
- at least one black liquor oxidation stage for converting at least a portion of the black liquor stream to an oxidized black liquor stream;
- an attenuated total reflection (ATR) ultraviolet/visible (UVN) spectroscopy section for determining simultaneously over a wavelength of from about 190 to about 500 nm an amount of sulfide, an amount of total dissolved solids, and an amount of effective alkali present in samples from the black liquor stream and the oxidized black liquor oxidation stream and for providing data comprising the sulfide amount, the total dissolved solids amount, and the effective alkali amount determined in the samples;
- and
- a black liquor oxidation control processor for monitoring and controlling the at least one black liquor oxidation stage based on the data provided from the attenuated total reflection (ATR) ultraviolet/visible (UV/V) spectroscopy section.
Dependencies are inferred from the claim text.