Process of removing sodium chloride from kraft pulping process chemical recovery systems
阅读：618发布：2021-01-14
专利汇可以提供Process of removing sodium chloride from kraft pulping process chemical recovery systems专利检索，专利查询，专利分析的服务。并且A process of removing sodium chloride which has accumulated in the precipitator catch of the kraft pulping process chemical recovery systems without undue loss of sodium sulfate and other useful chemicals. The process basically comprises leaching precipitator catch, which contains sodium sulfate, sodium carbonate, sodium chloride and organic material, with sufficient aqueous sulfuric acid solution to produce a leached slurry of pH 3-6, thereby converting sodium carbonate to sodium sulfate and recovering sodium chloride.，下面是Process of removing sodium chloride from kraft pulping process chemical recovery systems专利的具体信息内容。
2. The process as claimed in claim 1 in which the acid is spent sulfuric acid from a chlorine dioxide generator.
3. The process as claimed in claim 1 in which the anhydrous sodium sulfate is reduced to sodium sulfide and/or hydrogen sulfide.
4. The process as claimed in claim 1 in which the leach solution is filtered at about 40* to 80*C.
5. The process as claimed in claim 1 in which the leach solution is filtered at about 55*-65*C and pH about 4 to 5.
6. In the process for the pulping of lignocellulosic material comprising the steps of cooking the material with pulping liquor, evaporation of the pulping liquor, combustion of the pulping liquor, and precipitation as precipitator catch of the inorganic solids that are mixed with the combustion gases, said precipitator catch containing sodium sulfate, sodium carbonate, sodium chloride and organic material, the process which comprises the steps of leaching said precipitator catch to convert said sodium carbonate to sodium sulfate and to remove sodium chloride with an acidic aqueous solution containing only sufficient sulfuric acid to produce a leached slurry having a pH of about 3 to 6 and containing undissolved solids in a state readily separable from the liquid, filtering the leached slurry to provide a solid cake phase of anhydrous sodium sulfate and a liquid phase enriched in sodium chloride, separating said liquid phase from the solid phase and recycling a portion of said liquid phase to said leaching step.
7. A process as claimed in claim 6 wherein the acid is spent sulfuric acid from a chlorine dioxide generator.
8. A process as claimed in claim 6 wherein the anhydrous sodium sulfate is reduced to sodium sulfide and/or hydrogen sulfide.
9. A process as claimed in claim 6 wherein the leach solution is filtered at 40*-80*C.
10. A process as claimed in claim 6 wherein the leach solution is filtered at about 55*-65*C. and pH about 4 to 5.
11. The process of removing sodium chloride from the chemical recovery systems of kraft pulping processes, which comprises heating and agitating liquor containing sodium chloride and sodium sulfate and pH about 4.9 to about 55*C., slowly adding water, sulfuric acid and precipitator catch containing sodium sulfate, sodium chloride, sodium carbonate and organic material, to said liquor, while maintaining temperature at about 55*C. and the pH at about 4.5 with some agitation for about 30 minutes, the resulting aqueous solution containing only sufficient acid to produce a leached slurry containing undissolved solids in a state readily separable from the liquid and to convert the sodium carbonate to sodium sulfate, filtering the leached slurry to remove as much sodium chloride-enriched liquor as possible from the formed filter cake, drying said cake and recycling a portion of said liquid phase to said leaching step.
12. The process of removing sodium chloride from the chemical recovery system of kraft pulping processes, which comprises the steps of leaching the precipitator catch containing sodium sulfate, sodium carbonate, sodium chloride and organic material to convert the sodium carbonate to sodium sulfate and to remove said sodium chloride first in a slightly basic solution to provide a leached slurry containing udissolved solids, adjusting said slurry, by the addition of sulfuric acid to a slightly acidic solution containing only sufficient acid to produce a leached slurry having a pH of about 3 to 6 and containing undissolved solids in a state readily separable from the liquid, filtering the leached slurry to give a cake of anhydrous sodium sulfate separated from a filtrate enriched in sodium chloride and recycling a portion of said liquid phase to said leaching step.
13. A process as claimed in claim 6 including leaching said precipitated inorganic solids first in a sLightly basic solution and then adjusting to said slightly acidic solution having a pH of about 3 to 6.
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