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公开(公告)号：US4986973A
公开(公告)日：1991-01-22
申请号：US426714
申请日：1989-10-26
IPC分类号： C01B11/02
CPC分类号： C01B11/023
摘要： A process for producing chlorine dioxide by reacting in a reaction vessel an alkali metal chlorate, mineral acid and a reducing agent in such proportions that chlorine dioxide is produced in a reaction medium maintained at a temperature of from about 50.degree. C. to about 100.degree. C. and at an acidity within a range of from about 2 to about 11 N. The reaction medium is subjected to subatmospheric pressure sufficient for evaporating water, a mixture of chlorine dioxide and water vapor being withdrawn from an evaporation zone in the reaction vessel and alkali metal sulfate being precipitated in a crystallization zone in the reaction vessel. A mixture of formaldehyde and methanol is used as reducing agent.
摘要翻译： 一种通过在反应容器中使碱金属氯酸盐，无机酸和还原剂在保持温度为约50℃至约100℃的反应介质中产生二氧化氯的比例反应生产二氧化氯的方法。 并且在约2至约11N的范围内的酸度。将反应介质经受足够的低于大气压的蒸发水，将二氧化氯和水蒸汽的混合物从反应容器中的蒸发区抽出， 碱金属硫酸盐在反应容器中的结晶区沉淀。 使用甲醛和甲醇的混合物作为还原剂。
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公开(公告)号：US5093097A
公开(公告)日：1992-03-03
申请号：US594559
申请日：1990-10-09
申请人： Jorgen Engstrom , Birgitta Sundblad
发明人： Jorgen Engstrom , Birgitta Sundblad
IPC分类号： C01B11/02
CPC分类号： C01B11/023
摘要： A process for the production of chlorine dioxide by reacting in a reaction vessel an alkali metal chlorate, mineral acid and a reducing agent in such proportions that chlorine dioxide is produced in a reaction medium which is maintained at a temperature of from about 50.degree. C. to about 100.degree. C. and at an acidity within a range of from about 2 to about 11N and which is subjected to subatmospheric pressure sufficient for evaporating water. A mixture of chlorine dioxide and water vapor is withdrawn from an evaporation zone in the reaction vessel, and alkali metal sulfate is precipitated in a crystallization zone in the reaction vessel. Straight chained alcohols with the formula CH.sub.2 OH(CHOH).sub.n CH.sub.2 OH where n=0-5, are used as reducing agents. Preferred reducing agents consist of glycol or glycerol. The reaction may also be performed in the presence of a catalyst.
摘要翻译： 一种通过在反应容器中使碱金属氯酸盐，无机酸和还原剂在保持在约50℃的反应介质中产生二氧化氯的比例反应生产二氧化氯的方法。 至约100℃，酸度在约2至约11N的范围内，并经受足以蒸发水的低于大气压的压力。 将二氧化氯和水蒸气的混合物从反应容器中的蒸发区抽出，碱金属硫酸盐在反应容器的结晶区析出。 使用其中n = 0-5的式CH 2 OH（CHOH）n CH 2 OH的直链醇用作还原剂。 优选的还原剂由二醇或甘油组成。 反应也可以在催化剂的存在下进行。
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3.发明授权Process and apparatus for the production of sulphuric acid and alkali metal hydroxide 失效用于生产硫酸和碱金属氢氧化物的方法和设备
公开(公告)号：US5423959A
公开(公告)日：1995-06-13
申请号：US264251
申请日：1994-06-22
申请人： Birgitta Sundblad , Goran Sundstrom
发明人： Birgitta Sundblad , Goran Sundstrom
摘要： The present invention relates to an electrochemical process for the production of sulphuric acid and alkali metal hydroxide, from an aqueous anolyte containing alkali metal sulphate. According to the invention, crystalline alkali metal sulphate is added to the anolyte, whereby the concentration of water can be maintained below about 55 percent by weight. In the electrolysis, the anolyte is brought to an electrochemical cell with a cation exchange membrane. In the cell, sulphuric acid and oxygen are formed in the anode compartment and alkali metal hydroxide and hydrogen in the cathode compartment. The steps normally preceding the electrolysis, i.e. dissolution and purification of the sulphate can be disposed of, since the process is less sensitive to impurities than the processes of the prior art. The present invention also relates to an apparatus for the production of sulphuric acid and alkali metal hydroxide according to the invention.
摘要翻译： 本发明涉及从含有碱金属硫酸盐的阳极电解液制备硫酸和碱金属氢氧化物的电化学方法。 根据本发明，向阳极电解液中加入结晶性碱金属硫酸盐，由此将水的浓度维持在约55重量％以下。 在电解中，阳极电解液被带到具有阳离子交换膜的电化学电池中。 在电池中，阳极室中形成硫酸和氧，阴极室中形成碱金属氢氧化物和氢。 通常在电解之前的步骤，即硫酸盐的溶解和纯化可以被处理，因为该方法比现有技术的方法对杂质不那么敏感。 本发明还涉及根据本发明的用于生产硫酸和碱金属氢氧化物的设备。
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公开(公告)号：US5227031A
公开(公告)日：1993-07-13
申请号：US727405
申请日：1991-07-08
申请人： Birgitta Sundblad
发明人： Birgitta Sundblad
CPC分类号： C01B11/025 , B01D61/44 , B01D61/445 , C01B11/023 , C01D5/00 , C25B1/16 , C25B1/22
摘要： A process for the production of chlorine dioxide by reacting an alkali metal chlorate, mineral acid and a reducing agent in such proportions that chlorine dioxide is produced in a reaction medium which is maintained at a temperature of 50.degree. C.-100.degree. C. and at an acidity within a range of 2-12 N and which is subjected to subatmospheric pressure sufficient for evaporating water. A mixture of chlorine dioxide and water vapour is withdrawn from an evaporation zone in the reaction vessel, and alkali metal sulphate is precipitated in a crystallization zone in the reaction vessel. The precipitated alkali metal sulphate is contacted with a saturated water solution of alkali metal sulphate whereafter neutral alkali metal sulphate is precipitated and dissolved in water. The water solution is brought to an electrochemical membrane cell in which sulphuric acid is formed in the anode compartment and alkali metal hydroxide in the cathode compartment.
摘要翻译： 一种通过使碱金属氯酸盐，无机酸和还原剂与保持在50℃-100℃的反应介质中产生二氧化氯的比例反应制备二氧化氯的方法，以及 在2-12N的范围内的酸度，并且经受足以蒸发水的低于大气压的压力。 二氧化氯和水蒸汽的混合物从反应容器中的蒸发区抽出，碱金属硫酸盐在反应容器中的结晶区沉淀。 将沉淀的碱金属硫酸盐与碱金属硫酸盐的饱和水溶液接触，然后将中性碱金属硫酸盐沉淀并溶解在水中。 将水溶液带到电化学膜池中，其中在阳极室中形成硫酸，在阴极室中形成碱金属氢氧化物。
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公开(公告)号：US5770171A
公开(公告)日：1998-06-23
申请号：US486122
申请日：1990-03-05
IPC分类号： C01B11/02
CPC分类号： C01B11/023
摘要： A process for production of chlorine dioxide which is substantially free of by product chlorine. Chlorine-dioxide is produced from an alkali metal chlorate, a mineral acid and a reducing agent such as methanol in a reaction medium maintained at an acid normality of less than 9 and with a high chlorate molarity. The process is carried out in the substantial absence of additional chloride ion being fed to the process. It has been found that increasing the chlorate concentration at a given acid normality reduces the amount of chloride in the reaction medium thus reducing the amount of chlorine by-product. The process is carried out in a vessel operated under subatmospheric pressure, whereby water is evaporated and withdrawn together with chlorine dioxide and the alkali metal salt of the mineral acid is crystallized within the reaction vessel and withdrawn therefrom. According to the invention, high production rates with high efficiency of chlorine dioxide can be achieved while producing essentially no chlorine by-product.
摘要翻译： 生产基本上不含氯的二氧化氯的方法。 二氧化氯由碱金属氯酸盐，无机酸和还原剂如甲醇在反应介质中产生，反应介质维持在酸值正常值小于9且氯酸盐摩尔浓度高。 该方法在基本上没有额外的氯离子进料到该方法中进行。 已经发现，以给定的酸正常值提高氯酸盐浓度降低了反应介质中的氯化物的量，从而减少了副产物的量。 该方法在低于大气压下操作的容器中进行，由此与二氧化氯一起蒸发和抽出水，无机酸的碱金属盐在反应容器内结晶并从其中取出。 根据本发明，可以在基本上不产生氯副产物的同时实现二氧化氯效率高的高生产率。
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公开(公告)号：US5628874A
公开(公告)日：1997-05-13
申请号：US392761
申请日：1995-02-23
申请人： Hans Lindberg , Birgitta Sundblad
发明人： Hans Lindberg , Birgitta Sundblad
CPC分类号： D21C11/04 , D21C11/066
摘要： The present invention relates to an environmental-friendly process for reducing the content of chloride in a liquor inventory of a chemical pulp mill. According to the invention, in a recovery system for pulping chemicals containing sulphur and an alkali metal, precipitator dust formed in a recovery boiler is collected and withdrawn, dissolved in water and electrolyzed for production of chlorine or hydrochloric acid in the anolyte. Since the dust normally contains a large amount of sodium sulphate, sulphuric acid and sodium hydroxide can also be produced in the electrolysis. To reduce the content of impurities, before the electrolysis, the pH of the aqueous solution is adjusted to above about 10 to precipitate inorganic substances which are separated-off together with flocculated or undissolved substances.
摘要翻译： PCT No.PCT / SE93 / 00688 Sec。 371日期1995年2月23日 102（e）1995年2月23日PCT PCT 1993年8月18日PCT公布。 第WO94 / 04747号公报 日期：1994年3月3日本发明涉及一种用于降低化学纸浆厂的液体库存中的氯化物含量的环保方法。 根据本发明，在用于制备含硫和碱金属的化学品的回收系统中，在回收锅炉中形成的除尘器粉尘被收集和抽出，溶解在水中并电解以在阳极电解液中生产氯或盐酸。 由于粉尘通常含有大量的硫酸钠，所以在电解中也可以生成硫酸和氢氧化钠。 为了减少杂质的含量，在电解之前，将水溶液的pH调节至约10以上，以沉淀与絮凝或未溶解的物质一起分离的无机物质。
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公开(公告)号：US5437791A
公开(公告)日：1995-08-01
申请号：US190367
申请日：1994-02-02
CPC分类号： C02F1/54 , B01D1/0094 , B01D1/12 , C02F1/5236 , C02F2103/28 , Y10S210/928
摘要： Process water from pulp manufacture is purified in a separator device by mechanical or a combination of mechanical and chemical methods and is thereafter evaporated, at least part of the concentrate resulting from the evaporation being recycled and mixed with the process water fed into the separator device. In a preferred embodiment, a precipitant is added to the mixed water comprising the process water and the concentrate. The part of the concentrate not recycled and mixed with the process water is supplied, optionally after further evaporation, with an acid to a pH of 1-5, whereupon resulting flocs and precipitates are removed in a separator device.
摘要翻译： 来自纸浆制造的工艺水通过机械或机械和化学方法的组合在分离器装置中纯化，然后蒸发，由蒸发产生的至少部分浓缩物被再循环并与进入分离器装置的工艺水混合。 在优选的实施方案中，将沉淀剂加入到包含工艺水和浓缩物的混合水中。 不经再循环并与工艺水混合的部分浓缩物，任选地在进一步蒸发之后，用酸将pH提供至1-5，于是在分离器装置中除去所得的絮凝物和沉淀物。
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公开(公告)号：US5061471A
公开(公告)日：1991-10-29
申请号：US514539
申请日：1990-04-26
IPC分类号： C01B11/02
CPC分类号： C01B11/023
摘要： A process for a continuous production of chlorine dioxide in a cooled reaction vessel subjected to an overpressure, comprising continuous addition of an aqueous solution of an alkali metal chlorate, sulfuric acid and sulfur dioxide to the reaction vessel in proportions to generate chlorine dioxide at a temperature from about 30.degree. to about 60.degree. C. and at an acidity of about 5 to about 11 N. The reaction solution containing dissolved chlorine dioxide is continuously withdrawn. At the start up of the process the reaction vessel is filled with the water solution of alkali metal chlorate, optionally containing alkali metal chloride, and the sulphuric acid with a feed concentration of from about 20 to about 60 percent by weight whereafter the flows are adjusted to correspond to the production rate. Finally sulfuric dioxide is added so slowly that no gas phase is formed and the sulphuric acid flow is slowly increased until the suitable flow for the chosen production is reached.
摘要翻译： 在经过过压的冷却的反应容器中连续生产二氧化氯的方法，包括将碱金属氯酸盐，硫酸和二氧化硫的水溶液连续加入到反应容器中，以在一定温度下产生二氧化氯 约30至约60℃，酸度约5至约11N。连续抽出含有溶解的二氧化氯的反应溶液。 在该过程开始时，反应容器中填充碱金属氯酸盐的水溶液，任选地含有碱金属氯化物，并且进料浓度为约20至约60重量％的硫酸，然后调节流量 以符合生产率。 最后，如此缓慢地加入二氧化硫，使得不形成气相，并缓慢增加硫酸流，直至达到所选生产的合适流量。
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