公开(公告)号：EP0656872B1

公开(公告)日：1996-05-22

申请号：EP93919746.3

申请日：1993-08-11

申请人： EKA NOBEL AB

发明人： ANDERSSON, Kjell ,  LARSSON, Bo ,  LINDGREN, Erik

IPC分类号： C01B33/143 ,  D21H17/63 ,  D21H21/10

CPC分类号： D21H17/68 ,  C01B33/143 ,  C01B33/149 ,  D21H17/375 ,  D21H17/45

摘要： Silica sols with a high content of microgel and particles with a specific surface area within the range 300 to 700 m2/g, preferably 400 to 650 m2/g. The sols can be prepared by acidification of a water glass solution and alkalization at a certain dry content, alternatively to a certain pH. The sols are particularly suitable for use as additives in papermaking in combination with cationic polymers and especially in combination with cationic acrylamide based polymers.

公开(公告)号：EP0612739B1

公开(公告)日：1996-04-17

申请号：EP94200263.5

申请日：1994-02-01

申请人： EKA NOBEL AB

发明人： McIntosh, Paul Stewart

IPC分类号： C07D305/12 ,  C07D315/00

CPC分类号： C07D315/00 ,  C07C45/89 ,  C07C49/88 ,  C07D305/12

公开(公告)号：EP0485000B1

公开(公告)日：1996-01-17

申请号：EP91202713.3

申请日：1991-10-21

申请人： EKA NOBEL AB

发明人： Jadesjö, Gunilla ,  Magnusson, Bertil ,  Sundstrand, Signar

IPC分类号： G01N31/00

CPC分类号： G01N33/18 ,  G01N21/78 ,  Y10T436/206664 ,  Y10T436/25 ,  Y10T436/2525

公开(公告)号：EP0660899A1

公开(公告)日：1995-07-05

申请号：EP92914854.0

申请日：1992-06-12

申请人： EKA NOBEL AB

发明人： CARRE, Bruno ,  CARLSON, Ulf

IPC分类号： D21H17 ,  D21H21

CPC分类号： D21H21/10

摘要： A process for improved dewatering and retention in the production of paper, where an anionic retention agent based on starches, cellulose derivatives or guar gums having no cationic groups and an acidic solution of an aluminium compound are added to the stock containing lignocellulose-containing fibres and optionally fillers. The pH of the stock prior to the addition of the aluminium compound should be at least about 6 to obtain the desired cationic aluminium hydroxide complexes in the stock. The present process is cost effective and insensitive to the content of calcium in the white water.

公开(公告)号：EP0470940B1

公开(公告)日：1995-05-24

申请号：EP91850179.2

申请日：1991-06-26

申请人： EKA NOBEL AB

发明人： Tewari, Mohan Prasad

IPC分类号： C01D3/08 ,  B01F1/00

CPC分类号： C01D3/08 ,  Y10S422/902

公开(公告)号：EP0644853A1

公开(公告)日：1995-03-29

申请号：EP93913716.0

申请日：1993-05-27

申请人： EKA NOBEL AB

发明人： WINTERS, John, R. ,  GRAY, John, M. ,  TENNEY, Joel D.

IPC分类号： C01B11 ,  C25B1

CPC分类号： C01B11/026

摘要： The invention relates to a method of producing chlorine dioxide, which method comprises reacting chloric acid with hydrogen peroxide as a reducing agent in such proportions that chlorine dioxide is produced.

摘要翻译： 本发明涉及生产二氧化氯的方法，该方法包括使氯酸与作为还原剂的过氧化氢按照产生二氧化氯的比例反应。

公开(公告)号：EP0527899B1

公开(公告)日：1995-01-25

申请号：EP91909764.2

申请日：1991-04-24

申请人： EKA NOBEL AB

发明人： LAGNEMO, Hans ,  FORSSTRÖM, Annbritt

IPC分类号： C07C409/32 ,  C07C409/40 ,  C07C409/42 ,  C11D3/39

CPC分类号： C07C291/04 ,  C07C409/34 ,  C07C409/40 ,  C07C409/42 ,  C11D3/3945

摘要： The invention concerns diacylated dipercarboxylic acids according to general formula (I), in which R1 and R2 are hydrocarbon groups having from 1 to 15 carbon atoms, and X is electron attracting by being an optionally substituted phenyl group, an optionally substituted heterocycle in which the hetero atom is positioned so that from 2 to 4 carbon atoms are present between the hetero atom and each one of the carbonyl carbons of the diperacid, or by comprising at least one electron attracting functional group positioned so that a carbon chain having from 2 to 4 carbon atoms is present between said electron attracting group and each one of the carbonyl carbons of the diperacid, wherein the electron attracting group contains oxygen, sulfur, nitrogen, phosphorus, halogen, optionally substituted phenyl, or at least two conjugated double bonds, R1 and R2 are hydrocarbon groups having from 1 to 15 carbon atoms, except compounds in which X consists of a phenyl group having the carbonyl carbons in 1,4 position and both of R1 and R2 are acetyl or both of R1 and R2 are nonyl. The invention also concerns a method of their preparation, a composition useful for bleaching and a method of bleaching.

公开(公告)号：EP0612686A3

公开(公告)日：1994-10-05

申请号：EP94200268.4

申请日：1994-02-02

申请人： EKA NOBEL AB

发明人： Sokol, John C.

IPC分类号： C01B11/02

CPC分类号： C01B11/026

摘要： The invention relates to a process for continuously producing chlorine dioxide by reacting an alkali metal chlorate, sulfuric acid or another chlorine free mineral acid and hydrogen peroxide as reducing agent to produce chlorine dioxide in an aqueous reaction medium. The chlorine dioxide is generated in at least one reaction step comprising at least one reaction vessel, by feeding alkali metal chlorate, acid, hydrogen peroxide and inert gas to said reaction vessel, in substantial absence of added chloride ions, maintaining the aqueous reaction medium in said reaction vessel at a pressure of from about 400 mm Hg to about 900 mm Hg and at a temperature of from about 35°C to about 100°C and at an acidity within a range from about 4 to about 14 N and the chlorate concentration of between about 0.05 moles/l to saturation, withdrawing chlorine dioxide, oxygen and inert gas and the depleted aqueous reaction medium from said reaction zone without substantial crystallization of alkali metal sulfate.

公开(公告)号：EP0612686A2

公开(公告)日：1994-08-31

申请号：EP94200268.4

申请日：1994-02-02

申请人： EKA NOBEL AB

发明人： Sokol, John C.

IPC分类号： C01B11/02

CPC分类号： C01B11/026

摘要： The invention relates to a process for continuously producing chlorine dioxide by reacting an alkali metal chlorate, sulfuric acid or another chlorine free mineral acid and hydrogen peroxide as reducing agent to produce chlorine dioxide in an aqueous reaction medium. The chlorine dioxide is generated in at least one reaction step comprising at least one reaction vessel, by feeding alkali metal chlorate, acid, hydrogen peroxide and inert gas to said reaction vessel, in substantial absence of added chloride ions, maintaining the aqueous reaction medium in said reaction vessel at a pressure of from about 400 mm Hg to about 900 mm Hg and at a temperature of from about 35°C to about 100°C and at an acidity within a range from about 4 to about 14 N and the chlorate concentration of between about 0.05 moles/l to saturation, withdrawing chlorine dioxide, oxygen and inert gas and the depleted aqueous reaction medium from said reaction zone without substantial crystallization of alkali metal sulfate.

摘要翻译： 本发明涉及一种通过使碱金属氯酸盐，硫酸或其它不含氯的无机酸与过氧化氢作为还原剂反应来连续生产二氧化氯的方法，以在水性反应介质中产生二氧化氯。 在至少一个包含至少一个反应容器的反应步骤中，通过在基本上没有加入氯离子的情况下，向碱性金属氯酸盐，酸，过氧化氢和惰性气体中加入碱性金属，生成二氧化氯，将含水反应介质保持在 所述反应容器的压力为约400mmHg至约900mmHg，温度为约35℃至约100℃，酸度为约4至约14N，氯酸盐浓度 约0.05摩尔/升至饱和，从所述反应区抽出二氧化氯，氧气和惰性气体以及耗尽的水性反应介质，而碱金属硫酸盐基本上不结晶。

公开(公告)号：EP0612685A2

公开(公告)日：1994-08-31

申请号：EP94200267.6

申请日：1994-02-02

申请人： EKA NOBEL AB

发明人： Falgén, Helena ,  Sundström, Göran ,  Landfors, Johan ,  Sokol, John C.

IPC分类号： C01B11/02 ,  C25B1/46

CPC分类号： C01B11/026

摘要： The invention relates to a process of producing chlorine dioxide comprising the steps: Providing a reactor with an aqueous acidic reaction medium containing alkali metal chlorate and sulfate, wherein the concentration of sulfate exceeds about 3 moles/liter but is less than saturation; reducing chlorate ions in said reaction medium to form chlorine dioxide; withdrawing chlorine dioxide gas from the reaction medium; withdrawing reaction medium from the reactor and transferring it to an electrochemical cell; electrolysing said reaction medium to increase the acidity and decrease the content of alkali metal ions; recycling the acidified reaction medium to the reactor; adding make up alkali metal chlorate to the reaction medium before or after the electrochemical cell; wherein the process is performed substantially without crystallisation of sulfate or chlorate.

摘要翻译： 本发明涉及一种生产二氧化氯的方法，包括以下步骤：向反应器提供含有碱金属氯酸盐和硫酸盐的酸性反应介质，其中硫酸盐的浓度超过约3摩尔/升但小于饱和; 还原所述反应介质中的氯酸根离子形成二氧化氯; 从反应介质中取出二氧化氯气体; 从反应器中取出反应介质并将其转移到电化学电池; 电解所述反应介质以增加酸度并降低碱金属离子的含量; 将酸化的反应介质再循环到反应器中; 在电化学电池前后，向反应介质中加入碱金属氯酸盐; 其中所述方法基本上不用硫酸盐或氯酸盐结晶地进行。