Method of producing soda ash
阅读：27发布：2023-09-02
专利汇可以提供Method of producing soda ash专利检索，专利查询，专利分析的服务。并且This patent discloses a system for obtaining anhydrous sodium carbonate from crude sodium sesquicarbonate. The sesquicarbonate is calcined and impurities removed. The intermediate product, a solution of sodium carbonate, is evaporated under temperature conditions which result in growth of anhydrous sodium carbonate crystals. In the last stage of evaporation a co-solute of sodium hydroxide or sodium chloride is added to shift the phase boundary of sodium carbonate sufficiently to permit the last stage of crystallization to be carried out at atmospheric pressure while still growing crystals of anhydrous sodium carbonate. The preferred co-solute is sodium hydroxide and a system is shown for treating a bleed of the sodium hydroxide liquor from the last stage of evaporation to remove therefrom undesirable contaminants.，下面是Method of producing soda ash专利的具体信息内容。
2. The method of producing dense soda ash comprising, calcining crude sodium sesquicarbonate to convert it to sodium carbonate, then mixing the calcined ore with water and dissolving the sodium carbonate and other soluble salts therein, then removing the undissolved solids and coloring material from the aqueous sodium carbonate, then evaporating water from the sodium carbonate solution while maintaining the solution under pressure and at a temperature at which the stable solid phase field of the solution is anhydrous sodium carbonate to crystallize anhydrous sodium carbonate, then adding a co-solute of sodium hydroxide to said solution in sufficient amount to maintain the stable solid phase field of the solution as anhydrous sodium carbonate at not more than atmospheric pressure and reducing the pressure on said solution to not more than atmospheric to crystallize additional sodium carbonate, separating said crystals from the mother liquor, drying said crystals, evaporating at least a portion of the mother liquor to as high a concentration of sodium hydroxide as is possible wherein the only stable solid phase is anhydrous sodium carbonate, separating the anhydrous sodium carbonate crystals thus formed from the mother liquor, further evaporating water from the mother liquor to raise the sodium hydroxide concentration to a value at which substantially all of the undesirable sodium sulfate has crystallized as the triple salt sodium hydroxide-sodium chloride-sodium sulfate and crystals of sodium chloride and sodium carbonAte are formed, separating the said triple salt and sodium chloride and sodium carbonate solid phases from the mother liquor, cooling the said mother liquor to form additional solid phase sodium chloride, separating the solid phase sodium chloride from said mother liquor and recycling said mother liquor to the co-solute addition step, decomposing said separated triple salt in the presence of solid sodium carbonate by adding sufficient water to form solid phases of sodium chloride and sodium sulfate, separating said solid phases from resulting mother liquor, and returning said mother liquor to the triple salt crystallization step.
3. The method of removing sodium carbonate, sodium chloride and sodium sulfate from a liquor containing sodium hydroxide comprising, evaporating water from said solution to increase the concentration of sodium hydroxide therein to crystallize solid phase sodium carbonate, said evaporation being controlled to maintain the level of sodium hydroxide below that at which co-crystallization of chloride and sulfate containing solids is encountered, separating the solid phase sodium carbonate thus formed from the mother liquor, then evaporating water from said solution to raise the sodium hydroxide concentration to a level greater than 30 percent to crystallize the triple salt sodium hydroxide-sodium chloride-sodium sulfate, sodium chloride and sodium carbonate, separating the said triple salt, sodium chloride and sodium carbonate solids from the mother liquor, then cooling the mother liquor to further crystallize solid phase sodium chloride and obtain a relatively pure sodium hydroxide liquor, and separating the solid phase sodium chloride thus formed from the mother liquor.
4. The method of removing sodium carbonate, sodium chloride and sodium sulfate from a liquor containing sodium hydroxide comprising, evaporating water from said solution to increase the concentration of sodium hydroxide therein to crystallize solid phase sodium carbonate, said evaporation being controlled to maintain the level of sodium hydroxide below that at which co-crystallization of chloride and sulfate containing solids is encountered, separating the solid phase sodium carbonate thus formed from the mother liquor, then evaporating water from said solution to raise the sodium hydroxide concentration to a level greater than 30 percent to crystallize the triple salt sodium hydroxide-sodium chloride-sodium sulfate, sodium chloride and sodium carbonate, separating the said triple salt, sodium chloride and sodium carbonate solids from the mother liquor, then cooling the mother liquor to further crystallize solid phase sodium chloride and obtain a relatively pure sodium hydroxide liquor, separating the solid phase sodium chloride thus formed from the mother liquor, decomposing said triple salt by adding water thereto to form solid phase sodium chloride and sodium sulfate, separating the solids from the mother liquor and returning the mother liquor to the triple salt crystallization step.
5. The method of producing dense soda ash comprising, calcining crude sodium sesquicarbonate to convert it to sodium carbonate, then mixing the calcined ore with water and dissolving the sodium carbonate and other soluble salts therein, then removing the undissolved solids and coloring material from the aqueous sodium carbonate, then evaporating water from the sodium carbonate solution while maintaining the solution under pressure and at a temperature at which the stable solid phase field of the solution is anhydrous sodium carbonate to crystallize anhydrous sodium carbonate, then adding a co-solute selected from the group consisting of sodium hydroxide and sodium chloride to said solution in sufficient amount to maintain the stable solid phase field of the solution as anhydrous sodium carbonate at not more than atmospheric pressure and reducing the pressure on said solUtion to not more than atmospheric to crystallize additional anhydrous sodium carbonate, separating said crystals from the mother liquor, drying said crystals, further evaporating water from the mother liquor to crystallize anhydrous sodium carbonate, and separating said last formed crystals from the mother liquor and returning said last formed crystals to the co-solute addition step.
6. The method of removing sodium carbonate, sodium chloride and sodium sulfate from a liquor containing sodium hydroxide comprising, evaporating water from said solution to increase the concentration of sodium hydroxide therein to crystallize solid phase sodium carbonate, said evaporation being controlled to maintain the level of sodium hydroxide below that at which co-crystallization of chloride and sulfate containing solids is encountered, separating the solid phase sodium carbonate thus formed from the mother liquor, then evaporating water from said solution to raise the sodium hydroxide concentration to a level greater than 30 percent to crystallize the triple salt sodium hydroxide-sodium chloride-sodium sulfate, sodium chloride and sodium carbonate, separating the said triple salt, sodium chloride and sodium carbonate solids from the mother liquor, decomposing said triple salt by adding water thereto to form solid phase sodium chloride and sodium sulfate, separating the solids from the mother liquor and returning a portion of the mother liquor to the triple salt crystallization step.
| 标题 | 发布/更新时间 | 阅读量 |
|---|---|---|
| 锯齿状涡流场声混沌空化装置 | 2020-07-04 | 2 |
| 护肤化妆品 | 2020-08-20 | 2 |
| 一种海上平台生活污水处理电解方法 | 2020-06-19 | 2 |
| 一种脱硫脱硝油田注汽锅炉及方法 | 2020-08-14 | 2 |
| 自洁式的排污系统和方法 | 2021-08-24 | 1 |
| 一种自热式污泥及废碱废液的综合处理方法及装置 | 2020-05-20 | 0 |
| Removal of impurities in liquid aluminum alloy | 2022-12-23 | 2 |
| Measuring method of impurity in liquid | 2023-02-05 | 0 |
| Filter Sleeve for Enabling Waste Water Discharge Directly into the Environment | 2021-03-08 | 1 |
| Lithographic apparatus and device manufacturing method | 2021-02-24 | 3 |
高效检索全球专利专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台，是提供专利分析，专利查询，专利检索等数据服务功能的知识产权数据服务商。
我们的产品包含105个国家的1.26亿组数据，免费查、免费专利分析。
分析报告
专利汇分析报告产品可以对行业情报数据进行梳理分析，涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度，系统通过AI智能系统对图表进行解读，只需1分钟，一键生成行业专利分析报告。
QQ群二维码
意见反馈
意见反馈