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1. 发明专利

JP2002105891A METHOD FOR SUPPRESSING SCALE IN PAPER PULP MANUFACTURING PROCESS 失效
公开(公告)号：JP2002105891A
公开(公告)日：2002-04-10
申请号：JP2000304861
申请日：2000-10-04
申请人： HAKUTO KK
发明人： TANABE HIROKAZU , YAMAGUCHI ZENJI
IPC分类号： C02F5/00 , C02F5/10 , C02F5/14 , D21H21/02
摘要： PROBLEM TO BE SOLVED: To provide a method for suppressing calcium carbonate-based scale and calcium carbonate-silica/silicate multiple scale in a paper pulp manufacturing process. SOLUTION: This method comprises adding, to a paper pulp manufacturing process, (1) a water-soluble copolymer comprising as the constituent units (a) at least one kind selected from 2-acrylamide-2-methylpropanesulfonic acid and water-soluble salts thereof and (b) at least one kind selected from ethylenically unsaturated carboxylic acids, anhydrides thereof and water-soluble salts thereof and (2) at least one kind selected from phosphonic acid compounds and water-soluble salts thereof in the weight ratio (1)/(2) of (3:7) to (7:3).

2. 发明专利

JP2002061089A METHOD FOR CONTROLLING SCALE IN PROCESS FOR PRODUCING DEINKED WASTE PAPER PULP 失效
公开(公告)号：JP2002061089A
公开(公告)日：2002-02-28
申请号：JP2000246612
申请日：2000-08-16
申请人： HAKUTO KK
发明人： TANABE HIROKAZU , KOIDE SATORU
IPC分类号： C08F220/04 , C08F220/08 , D21C5/02 , D21C9/08
摘要： PROBLEM TO BE SOLVED: To provide a method for controlling scales in a process for producing deinked waste paper pulp, by which calcium carbonate scales and silicate-silica composite scales for can effectively be controlled to prevent the trouble of scale adhesion. SOLUTION: This method for controlling the scales in the process for producing the deinked waste paper pulp, characterized by adding a water-soluble copolymer containing (a) one or more compounds selected from 2-acrylamido-2- methylpropanesulfonic acid and its water-soluble salts and (b) one or more compounds selected from ethylenic unsaturated carboxylic acids and their anhydrides and water-soluble salts as constituting units.

3. 发明专利

JP2002146689A METHOD FOR SCALE CONTROL IN PROCESS FOR WASTE PAPER DEINKED PULP PRODUCTION 失效
公开(公告)号：JP2002146689A
公开(公告)日：2002-05-22
申请号：JP2000339111
申请日：2000-11-07
申请人： HAKUTO KK
发明人： TANABE HIROKAZU , YAMAGUCHI ZENJI
IPC分类号： D21C5/02 , D21B1/32
摘要： PROBLEM TO BE SOLVED: To provide a method for efficiently controlling a silicate compound scale mainly comprising a calcium carbonate scale and calcium carbonate in a process for waste paper deinked pulp production. SOLUTION: This method for scale control in a process for waste paper deinked pulp production comprises adding (1) a water-soluble polymer containing one or more kinds selected from an ethylenically unsaturated carboxylic acid, its anhydride and water-soluble salt as a constitutent component and (2) one or more kinds of phosphonic acids and their water-soluble salts in the ratio of (1):(2) of 1:9 to 6:4 (weight ratio).

4. 发明专利

JP2000234286A CLEANING OF SCALE IN PULP DIGESTER AND ITS PERIPHERAL EQUIPMENT 失效
公开(公告)号：JP2000234286A
公开(公告)日：2000-08-29
申请号：JP3217299
申请日：1999-02-10
申请人： HAKUTO KK
发明人： TANABE HIROKAZU , ITO HITOSHI
IPC分类号： C11D7/32 , D21C3/02
摘要： PROBLEM TO BE SOLVED: To clean scales in a pulp digester, etc., with a slight influence exercised over surrounding environment without a risk of corrosion of an apparatus by using an aqueous solution of a specific acidic amino acid derivative as a cleaning liquid. SOLUTION: An alkaline aqueous solution at pH >=9 containing >=5 wt.% of one or more kinds of an acidic amino acid derivative represented by the formula (n is 1 or 2), its alkali metal salt, an ammonium salt and an amine salt thereof, e.g. N,N-dicarboxymethylaspartic acid (salt) and/or N,N- dicarboxymethylglutamic acid (salt) is used as a cleaning liquid for cleaning scales in a digester or peripheral equipment thereof in a process for producing a kraft pulp.

5. 发明专利

JP2000226786A WASHING OF PAPERMAKING FELT 失效
公开(公告)号：JP2000226786A
公开(公告)日：2000-08-15
申请号：JP2881499
申请日：1999-02-05
申请人： HAKUTO KK
发明人： ITO HITOSHI , TANABE HIROKAZU
IPC分类号： C11D7/26 , D21F1/32
摘要： PROBLEM TO BE SOLVED: To provide effective washing method for keeping clean the felt for papermaking used in dehydration process of papermaking industry. SOLUTION: This method for washing felt for papermaking comprises using an aqueous solution of caustic alkali containing 0.1-100 g/L one or more kinds of hydroxycarboxylic acids selected from mucinic acid, galactonic acid, glucaric acid, gluconic acid, heptonic acid and their salts as a washing solution for felt for papermaking.

6. 发明专利

JP2000117292A CALCIUM OXALATE SCALE INHIBITOR FOR USE IN PAPER PULP PRODUCTION PROCESS 失效
公开(公告)号：JP2000117292A
公开(公告)日：2000-04-25
申请号：JP29049398
申请日：1998-10-13
申请人： HAKUTO KK
发明人： ITO HITOSHI , TANABE HIROKAZU
IPC分类号： C02F5/00 , C02F5/10
摘要： PROBLEM TO BE SOLVED: To provide the inhibitor which is capable of continuously and efficiently inhibiting calcium oxalate scale from being formed in a paper pulp production process and has good biodegradability by preparing an inhibitor containing as an active ingredient, a polyepoxysuccinic acid derivative obtained by reacting a hydroxycarboxylic acid with epoxysuccinic acid in a prescribed molar ratio of the hydroxycarboxylic acid to epoxysuccinic acid. SOLUTION: This inhibitor for inhibiting formation of calcium oxalate scale in a paper pulp production process, contains as an active ingredient, a polyepoxysuccinic acid derivative obtained by reacting a hydroxycarboxylic acid with epoxysuccinic acid in a molar ratio of the hydroxycarboxylic acid to epoxysuccinic acid of 1:3 to 1:30. As this hydroxycarboxylic acid used as one of the raw materials for preparation of the polyepoxysuccinic acid derivative, tartaric acid, malic acid, citric acid, lactic acid, gluconic acid, or the like, can be used. Epoxysuccinic acid used as the other raw material for preparation of the polyepoxysuccinic acid derivative, is prepared by a well-known method. In the preparation of such a polyepoxysuccinic acid derivative, when the molar ratio of epoxysuccinic acid is lower than the above range, the scale inhibitory effect of the resulting polyepoxysuccinic acid derivative is drastically reduced and when the molar ratio of epoxysuccinic acid is higher than the above range, and also if a calcium compound is used as a catalyst, separation of an insoluble calcium precipitate is sometimes caused.

7. 发明专利

JP2000170094A DESCALING BY WASHING IN DEINKING OF WASTEPAPER OR PAPERMAKING 失效
公开(公告)号：JP2000170094A
公开(公告)日：2000-06-20
申请号：JP34511798
申请日：1998-12-04
申请人： HAKUTO KK
发明人： ITO HITOSHI , TANABE HIROKAZU
IPC分类号： D21C5/02 , D21H21/02
摘要： PROBLEM TO BE SOLVED: To sufficiently wash out and remove scale formed in the deinking of wastepaper and in papermaking by adopting an aqueous solution of a caustic alkali including hydroxycarboxylic acid or its salt as a washing liquid. SOLUTION: The method of this invention is to wash out and remove scale including 20-50 wt.% ash composition comprising e.g. 20-50 wt.% SiO2, 10-40 wt.% CaO and 20-50 wt.% Al2O3, formed in a process for the deinking of wastepaper in producing paper pulp, in a process for papermaking, or the like, by adopting an aqueous solution (showing >=10 pH value) of a caustic alkali including at least one kind of hydroxycarboxylic acids selected from the group consisting of arabonic acid, glucaric acid, mucic acid, galactonic acid, heptonic acid and their salts (e.g. including 0.1-30 g/L sodium heptonate) as a washing fluid.

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