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1.发明公开REMOVAL OF IMPURITIES IN THE PRODUCTION OF CRYSTALLINE SODIUM CARBONATE, BICARBONATE, OR SULFITE 有权污染的结晶碳酸钠，碳酸氢钠，或亚硫酸盐THE PRODUCTION REMOVAL
公开(公告)号：EP2403806A1
公开(公告)日：2012-01-11
申请号：EP10707273.8
申请日：2010-03-05
摘要： A magnesium treatment for removing water-soluble impurities in a process for making crystalline sodium carbonate, bicarbonate, or sulfite. A waste comprising such impurities is treated with a magnesium compound to form water-insoluble matter which is removed to form a purified solution. The treatment may be performed on a solution which contains the waste and optionally dissolved calcined trona. The purified solution may be used as a feedstock to form crystalline soda ash, and/or used as a reactant to produce crystalline sodium sulfite or bicarbonate via reaction with SO2 or CO2. In preferred embodiments, the waste may comprise a purge or weak liquor, a reclaimed solid, or combinations thereof. The water-soluble impurities may be silicates and/or foam-causing organics, and the waste may contain sodium bicarbonate, sodium sesquicarbonate, and/or one or more sodium carbonate hydrates, such as decahydrate.
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2.发明公开Production of sulfur from sulfur dioxide obtained from flue gas 失效Schwefelherstellung aus Schwefeldioxyd aus Abgasen。
公开(公告)号：EP0246403A1
公开(公告)日：1987-11-25
申请号：EP87102971.6
申请日：1987-03-03
发明人： Miller , Ralph
CPC分类号： C01B17/60 , B01D53/501 , C01B17/0408 , C01B17/26 , C01D5/145
摘要： This invention is a regenerable process for producing elemental sulfur from SO 2 initially contained in a dilute gas source by: (1) absorbing the SO 2 in a concentrated Na 2 SO 3 solution to convert most of the Na 2 SO 3 to Na 2 S 2 O 5 ; (2) separating one third of the absorbed SO 2 ; (3) reacting the residual mixture with solid NaHC0 3 to form gaseous carbon dioxide used in a subsequent step and a slurry composed of solid Na 2 SO 3 suspended in a Na 2 SO 3 solution; (4) separating solid Na 2 S0 3 from the solution which is recycled to (1) above; (5) reducing solid Na 2 SO 3 to Na 2 S; (6) reacting the Na 2 S with H 2 O and CO 2 to form solid NaHC0 3 which is recycled to (3) above and gaseous H 2 S; (6) reacting gaseous H 2 S with SO 2 separated in (2) above to form water and elemental sulfur.
摘要翻译： 本发明是由稀土气体源中最初包含的SO 2生成元素硫的可再生方法，该方法是：（1）在浓缩的Na 2 SO 3溶液中吸收SO 2以将大部分Na 2 SO 3转化为Na 2 S 2 O 5; （2）分离吸收的二氧化硫的三分之一; （3）使残留混合物与固体NaHCO 3反应，形成后续步骤中使用的气态二氧化碳和由固体Na 2 SO 3悬浮在Na 2 SO 3溶液中的浆液; （4）从溶液中分离固体Na 2 SO 3，再循环至上述（1）; （5）将固体Na 2 SO 3还原成Na2S; （6）使Na 2 S与H 2 O和CO 2反应以形成固体NaHCO 3，将其再循环至上述（3）和气态H 2 S; （6）使气态H 2 S与上述（2）中分离的SO 2反应形成水和元素硫。
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3.发明公开
公开(公告)号：EP0202210A2
公开(公告)日：1986-11-20
申请号：EP86850158.6
申请日：1986-04-30
发明人： Ragnar, Bernhard
摘要： @ There is provided a method for producing compositions which can be used for preparing sodium dithionite, in which sulphur dioxide is brought into contact with a recirculating aqueous solution of sodium hydroxide and previously absorbed sulphur dioxide to a ratio of sulphur dioxide and the sum of sulphur dioxide and sodium oxide of 0.61-0.66, whereafter the resultant mixture is pressurized and liquid sulphur dioxide introduced therein to a ratio between sulphur dioxide and the sum of sulphur dioxide and sodium oxide of 0.75-0.81, and the water content is adjusted to a concentration of sulphur dioxide + sodium oxide of 10-13 percent by weight. The invention also relates to the use of the prepared composition for the manufacture of dithionite.
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4.发明授权REMOVAL OF IMPURITIES IN THE PRODUCTION OF CRYSTALLINE SODIUM CARBONATE, BICARBONATE, OR SULFITE 有权污染的结晶碳酸钠，碳酸氢钠，或亚硫酸盐THE PRODUCTION REMOVAL
公开(公告)号：EP2403806B1
公开(公告)日：2016-09-28
申请号：EP10707273.8
申请日：2010-03-05
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公开(公告)号：EP1888462A1
公开(公告)日：2008-02-20
申请号：EP06742114.9
申请日：2006-06-06
发明人： LU, Yuanjian
IPC分类号： C01B33/113 , C01B33/18 , C09C1/28 , C01D5/14
CPC分类号： C01B33/193 , C01B33/32 , C01D5/14
摘要： Provided is a process for producing silica and sodium sulfite with sodium sulfate, wherein a mixture of quartz sand, sodium sulfate and carbon is reacted to produce solid sodium silicate and sulfur dioxide, which are used to produce silica and sodium sulfite through the following steps: (1) Said solid sodium silicate is dissolved in water and then filtered to obtain a sodium silicate solution; a sodium hydrogen sulfite solution is added to said sodium silicate solution to produce precipitated silica and sodium sulfite solution and the resultant mixture is filtered; (2) One part of the filtrate obtained at the end of step (1) is brought into contact with said sulfur dioxide and the product, sodium hydrogen sulfite, is recycled to step (1); (3) The filter cake obtained at the end of step (1) is acidified, followed by filtration, washing and drying to obtain silica; and (4) The other part of the filtrate obtained at the end of step (1) is concentrated and dried to obtain solid sodium sulfite. The process of the present invention is of great industrial value due to its simple steps, useful by-products and low production cost.
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6.发明公开
公开(公告)号：EP1888461A1
公开(公告)日：2008-02-20
申请号：EP06742113.1
申请日：2006-06-06
IPC分类号： C01B33/113 , C01D5/14 , C01D5/02 , C09C1/28
CPC分类号： C01B33/32 , C01B33/193 , C01D5/02 , C01D5/14
摘要： The present invention provides a process for producing silica, sodium sulfite and sodium hydrogen sulfite with sodium sulfate, wherein quartz sand, sodium sulfate and carbon are mixed and charged into a furnace for reaction and the obtained solid sodium silicate and sulfur dioxide are used to prepare silica, sodium sulfite and sodium hydrogen sulfite according to the following steps: 1) To produce silica: said solid sodium silicate is dissolved in water and filtered to produce a water glass solution; then sulfuric acid is reacted with said water glass solution to produce precipitated silica and sodium sulfate; and the precipitated silica is washed, filtered, liquefied and dried to produce silica; 2) To produce sodium sulfite: soda is added into a sodium hydrogen sulfite solution to produce sodium sulfite solution; one part of said sodium sulfite solution is concentrated and evaporated to obtain dry sodium sulfite; and the other part of the sodium sulfite solution is reacted with the sulfur dioxide produced during the production of the sodium silicate to produce sodium hydrogen sulfite solution, which can be recycled and reused in step (2); 3) To produce sodium hydrogen sulfite: soda is added into a sodium hydrogen sulfite solution followed by reacting with the sulfur dioxide produced during the production of the sodium silicate to produce a supersaturated sodium hydrogen sulfite solution, which is crystallized and dried to obtain a dry solid sodium hydrogen sulfite. The process of the present invention produces various products at low production cost and without causing environmental problems, and thus it has great practical value.
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7.发明公开
公开(公告)号：EP4434937A1
公开(公告)日：2024-09-25
申请号：EP22934874.3
申请日：2022-11-30
发明人： WANG, Qin
摘要： The present invention provides a preparation method of iron phosphate and a preparation method of lithium iron phosphate. The preparation method of iron phosphate includes: mixing pyrite cinder and an sulfite evenly in water to obtain a first mixed system; adding phosphoric acid and a buffer to the first mixed system to perform a leaching reaction; performing a first solid-liquid separation on a slurry obtained from the leaching reaction to obtain a first filtrate and a first residue; introducing air into the first filtrate and then performing a first stirring reaction on the first filtrate; performing a second solid-liquid separation on a slurry obtained from the first stirring reaction to obtain a second filtrate and a second residue; and calcining the second residue to obtain iron phosphate; wherein the pressure of the leaching reaction is 0.25-0.5 MPa; the time of the leaching reaction is 1-2 hours; the pH of the reaction system of the leaching reaction is 1.5-3; the buffer includes sodium dihydrogen phosphate and/or disodium hydrogen phosphate. According to the preparation method of iron phosphate, the iron source in the pyrite cinder can be utilized, so that the preparation cost of iron phosphate is reduced. The method is simple and easy to operate.
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公开(公告)号：EP1334069B1
公开(公告)日：2006-06-21
申请号：EP01999200.7
申请日：2001-10-26
IPC分类号： C01D5/14
CPC分类号： C01D5/145 , B01D9/0031 , B01D9/0059 , B01D53/504 , C01C1/248
摘要： A system and method for producing salts using a crystallizer with an integrated column is disclosed. In the column, liquid, containing one reactant, absorbs a second reactant, from the gas stream. The second reactant reacts with the first reactant to produce salt. Liquid leaving the column and rich in salt, collects in the crystallizer. Conditions within the crystallizer promote nucleation and crystal growth. A recirculation system withdraws a portion of liquid from the crystallizer for introduction into the column.
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10.发明授权
公开(公告)号：EP0672447B1
公开(公告)日：1999-01-27
申请号：EP95400483.4
申请日：1995-03-06
申请人： RHODIA CHIMIE
CPC分类号： C01D5/14 , B01D53/502 , C01B17/62
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