JP3696368B2 - Antifoaming agent for phosphoric acid production process - Google Patents
Antifoaming agent for phosphoric acid production process Download PDFInfo
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- JP3696368B2 JP3696368B2 JP10955497A JP10955497A JP3696368B2 JP 3696368 B2 JP3696368 B2 JP 3696368B2 JP 10955497 A JP10955497 A JP 10955497A JP 10955497 A JP10955497 A JP 10955497A JP 3696368 B2 JP3696368 B2 JP 3696368B2
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- Prior art keywords
- phosphoric acid
- antifoaming agent
- production process
- acid production
- antifoaming
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【0001】
【発明の属する技術分野】
本発明は、リン酸の製造工程において使用される消泡剤に関する。
【0002】
【従来の技術】
工業的なリン酸の製造方法には、乾式法と湿式法の二方式がある。リン鉱石を硫酸等の鉱酸で分解し、リン酸とセッコウを生成させ、副成したセッコウを分離してリン酸を得る湿式法では、原料であるリン鉱石中に無機又は有機夾雑物が含まれるため、鉱酸による分解に伴って各種のガスが発生し、これが気泡生成の原因となっていた。このように発生した気泡はリン酸の製造自体に大きな障害を与えるため、リン酸の製造には従来から消泡剤が使用されていた。
【0003】
高級脂肪酸や脂肪酸誘導体からなる消泡剤は消泡効果自体は高いが、リン酸製造に伴って副成するセッコウをセッコウボード等として使用した場合に、ボードの強度の低下等の悪影響を及ぼすことが指摘されていた。そこで近年は、アルコール誘導体又はフェノール誘導体が使用されている。例えば、特公昭47−32511号公報は、湿式リン酸製造用消泡剤として、アルキルフェノールエトキシレート又はアルキルフェノールプロボキシレートを開示している。また、特公昭47−16284号は、
【化2】
R(OCH2CH2)nOC4H8OH
(式中、Rは、アルキル基等を表わす)で表わされるリン酸製造用消泡剤を開示している。更に、特公昭61−16486号公報は、ジアルキルフェノールアルコキシレートからなるリン酸製造用消泡剤を開示している。又、特公昭49−31639号公報は、炭素数10〜20の脂肪族アルコールのアルキレンオキサイド縮合物からなるリン酸製造用消泡剤等を開示している。更に、特公昭49−27751号公報は、高級アルコール、高級エ一テル、及び高級エ一テルアルコールからなる消泡性組成物を開示している。
【0004】
【発明が解決しようとする課題】
しかし、上記のような従来の消泡剤では消泡効果又は抑泡効果等が不十分な場合があり、更に優れた消泡剤を求める業界の要請があった。
【0005】
従って、本発明の目的は、リン酸の製造に伴って発生する泡の除去・抑制等を目的とする消泡剤を提供することにある。
【0006】
【課題を解決するための手段】
即ち、本発明は、下記の一般式(1)
【化3】
R1−O−(R2−O)n一H (1)
(式中、R1は、2級アルキル基を表わし、R2は、炭化水素基を表わし、nは、1以上の数を表わす。)で表わされる化合物よりなるリン酸製造工程用消泡剤である。
【0007】
【発明の実施の形態】
本発明のリン酸製造工程用消泡剤は、一般式(1)で表わされる化合物からなる。一般式(1)において、R1は、2級アルキル基を表わす。なお、2級アルキル基は以下の構造で表わされる基である:
【化4】
(式中、R’及びR”は、アルキル基を表わす。)
【0008】
ここで、アルキル基としては例えば、メチル、エチル、プロピル、イソプロピル、ブチル、イソブチル、ターシャリブチル、ペンチル、イソペンチル、ネオペンチル、ターシャリペンチル、ヘキシル、ヘプチル、オクチル、2−エチルヘキシル、ノニル、デシル、ウンデシル、ドデシル、トリデシル、イソトリデシル、ミリスチル、パルミチル、ステアリル、イコシル、ドコシル、テトラコシル、トリアコンチル、2−オクチルドデシル、2−ドデシルヘキサデシル、2−テトラデシルオクタデシル、モノメチル分岐−イソステアリル等が挙げられる。
中でも、R1として好ましい基は、炭素数6〜20の2級アルキル基である。
【0009】
R2は炭化水素基であるが、炭素数2〜4のアルキレン基であることが好ましく、エチレン基であることがより好ましく、R2が2種以上の基である場合は1種はエチレン基であることが好ましい。一般式(1)の(R2−O)n部は、エチレンオキサイド、プロピレンオキサイド、ブチレンオキサイド、エピクロルヒドリン等のアルキレンオキサイド等を付加重合することにより得ることができる。又、付加させるアルキレンオキサイド等により、R2が決定され、付加させるアルキレンオキサイド等の重合形態は特に限定されず、1種類のアルキレンオキサイド等の単独重合、2種類以上のアルキレンオキサイド等のランダム共重合、ブロック共重合又はランダム/ブロック共重合等であってよい。重合度nは1以上の数であり、好ましくは1〜100、より好ましくは1〜30、更に好ましくは3〜15である。
【0010】
又、優れた消泡効果を発揮するためには一般式(1)で表わされる消泡剤のHLBは10以下が好ましい。本発明の消泡剤の添加量は特に限定されないが、効果的に消泡効果を発揮させるためには、リン鉱石に対して10〜10,000ppmが好ましく、50〜5,000ppmがより好ましく、300〜3,000ppmが更に好ましい。
【0011】
本発明の消泡剤の使用態様は特に限定されず、リン酸を製造する工程中に発生した泡を抑制、低減、除去等をする目的で使用されればよい。具体的には例えば、湿式リン酸製造工程においてリン鉱石を硫酸等の鉱酸で分解するに際して予めリン鉱石粉末中に混入させる、予めリン鉱石分解用の鉱酸に添加させておく、或いはリン鉱石分解工程中に系内に添加する等の使用態様が挙げられる。
【0012】
本発明の消泡剤は、他の成分、例えば高級脂肪酸、脂肪酸エステル、アルキルフェノールエトキシレート、アルキルフェノールプロポキシレート、ジアルキルフェノールアルコキシレート、高級脂肪族アルコールのアルキレンオキサイド縮合物、高級アルコール、高級エ一テル、高級エ一テルアルコール等の公知の他の消泡剤と併用することができる。
【0013】
【実施例】
以下、本発明を実施例により更に具体的に説明する。尚、以下の実施例中、部及び%は特に記載がない限り重量基準である。
1,000mlのメスシリンダーに85℃に加熱した工業用リン酸200mlを入れた後、更に濃度64%の硫酸60ml、リン鉱石70g及び本発明の消泡剤若しくは比較品を100mg加え、このメスシリンダーを85℃の恒温槽に静置した。続いて、各メスシリンダー内に上下に2枚のスクリュー羽根を有する撹拌機を挿入して250rpmの回転速度で15分間撹拌し、撹拌に伴う泡の高さを測定して、その泡の高さの最大値から消泡効果を評価した。使用した消泡剤及び試験の結果は以下のとおり。なお、EOはエチレンオキサイド、POはプロピレンオキサイド、BOはブチレンオキサイドの略である。
【0014】
【表1】
【0015】
【発明の効果】
本発明の効果は、リン酸の製造に伴って発生する泡の除去・抑制等を目的とする消泡剤を提供することにある。本発明によれば、リン酸の製造に伴って発生する泡を除去・抑制等することができ、効率的にリン酸を製造することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antifoaming agent used in the production process of phosphoric acid.
[0002]
[Prior art]
There are two types of industrial phosphoric acid production methods, a dry method and a wet method. In the wet method of decomposing phosphorus ore with a mineral acid such as sulfuric acid to form phosphoric acid and gypsum, and separating the by-product gypsum to obtain phosphoric acid, the raw ore containing inorganic or organic impurities Therefore, various gases are generated with the decomposition by the mineral acid, which causes the generation of bubbles. Since the bubbles generated in this way give a great obstacle to the production of phosphoric acid itself, an antifoaming agent has been conventionally used for the production of phosphoric acid.
[0003]
Antifoaming agents composed of higher fatty acids and fatty acid derivatives have a high defoaming effect per se, but when gypsum produced as a by-product in the production of phosphoric acid is used as gypsum board, etc., it may adversely affect the strength of the board. Was pointed out. In recent years, therefore, alcohol derivatives or phenol derivatives have been used. For example, Japanese Patent Publication No. 47-32511 discloses alkylphenol ethoxylate or alkylphenol propoxylate as an antifoaming agent for wet phosphoric acid production. In addition, Japanese Patent Publication No. 47-16284 is
[Chemical formula 2]
R (OCH 2 CH 2 ) n OC 4 H 8 OH
(Wherein R represents an alkyl group or the like), an antifoaming agent for producing phosphoric acid is disclosed. Japanese Examined Patent Publication No. 61-16486 discloses an antifoaming agent for producing phosphoric acid comprising a dialkylphenol alkoxylate. Japanese Examined Patent Publication No. 49-31639 discloses an antifoaming agent for producing phosphoric acid comprising an alkylene oxide condensate of an aliphatic alcohol having 10 to 20 carbon atoms. Japanese Patent Publication No. 49-27751 discloses an antifoaming composition comprising a higher alcohol, a higher ether, and a higher ether alcohol.
[0004]
[Problems to be solved by the invention]
However, the conventional antifoaming agent as described above may have insufficient antifoaming effect or antifoaming effect, and there has been a demand from the industry for an even better antifoaming agent.
[0005]
Accordingly, an object of the present invention is to provide an antifoaming agent for the purpose of removing / suppressing bubbles generated with the production of phosphoric acid.
[0006]
[Means for Solving the Problems]
That is, the present invention provides the following general formula (1)
[Chemical 3]
R 1 —O— (R 2 —O) n H 1 (1)
Wherein R 1 represents a secondary alkyl group, R 2 represents a hydrocarbon group, and n represents a number of 1 or more. It is.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The antifoaming agent for phosphoric acid manufacturing process of this invention consists of a compound represented by General formula (1). In the general formula (1), R 1 represents a secondary alkyl group. The secondary alkyl group is a group represented by the following structure:
[Formula 4]
(In the formula, R ′ and R ″ represent an alkyl group.)
[0008]
Here, examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tertiary butyl, pentyl, isopentyl, neopentyl, tertiary pentyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, undecyl. , Dodecyl, tridecyl, isotridecyl, myristyl, palmityl, stearyl, icosyl, docosyl, tetracosyl, triacontyl, 2-octyldodecyl, 2-dodecylhexadecyl, 2-tetradecyloctadecyl, monomethyl branched-isostearyl and the like.
Among these, a preferable group as R 1 is a secondary alkyl group having 6 to 20 carbon atoms.
[0009]
R 2 is a hydrocarbon group, preferably an alkylene group having 2 to 4 carbon atoms, more preferably an ethylene group, and when R 2 is two or more groups, one type is an ethylene group. It is preferable that The (R 2 —O) n part of the general formula (1) can be obtained by addition polymerization of alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, epichlorohydrin, and the like. In addition, R 2 is determined by the alkylene oxide to be added, and the polymerization form of the alkylene oxide to be added is not particularly limited. Homopolymerization of one type of alkylene oxide or the like, Random copolymerization of two or more types of alkylene oxide or the like , Block copolymerization or random / block copolymerization. The polymerization degree n is a number of 1 or more, preferably 1 to 100, more preferably 1 to 30, and still more preferably 3 to 15.
[0010]
Moreover, in order to exhibit the outstanding defoaming effect, HLB of the antifoamer represented by General formula (1) has preferable 10 or less. The amount of the antifoaming agent of the present invention is not particularly limited, but in order to effectively exhibit the antifoaming effect, 10 to 10,000 ppm is preferable with respect to the phosphate ore, and 50 to 5,000 ppm is more preferable. More preferably, it is 300 to 3,000 ppm.
[0011]
The usage aspect of the antifoamer of this invention is not specifically limited, What is necessary is just to be used for the purpose of suppressing, reducing, removing, etc. the foam which generate | occur | produced in the process which manufactures phosphoric acid. Specifically, for example, when decomposing phosphorous ore with a mineral acid such as sulfuric acid in the wet phosphoric acid production process, it is mixed in the phosphorous ore powder in advance, or is added in advance to the mineral acid for decomposing phosphorous ore, or phosphorous ore Examples of usage include addition into the system during the decomposition step.
[0012]
The antifoaming agent of the present invention includes other components such as higher fatty acids, fatty acid esters, alkylphenol ethoxylates, alkylphenol propoxylates, dialkylphenol alkoxylates, alkylene oxide condensates of higher aliphatic alcohols, higher alcohols, higher ethers, It can be used in combination with other known antifoaming agents such as higher ether alcohols.
[0013]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. In the following examples, parts and% are based on weight unless otherwise specified.
After putting 200 ml of industrial phosphoric acid heated to 85 ° C. into a 1,000 ml graduated cylinder, further add 60 ml of sulfuric acid with a concentration of 64%, 70 g of phosphate ore and 100 mg of the antifoaming agent of the present invention or a comparative product. Was placed in a constant temperature bath at 85 ° C. Subsequently, a stirrer having two screw blades is inserted into each graduated cylinder and stirred for 15 minutes at a rotational speed of 250 rpm. The height of the foam accompanying stirring is measured, and the height of the foam is measured. The defoaming effect was evaluated from the maximum value. The antifoaming agent used and the test results are as follows. In addition, EO is an abbreviation for ethylene oxide, PO is propylene oxide, and BO is butylene oxide.
[0014]
[Table 1]
[0015]
【The invention's effect】
An effect of the present invention is to provide an antifoaming agent for the purpose of removing and suppressing bubbles generated with the production of phosphoric acid. According to the present invention, it is possible to remove / suppress bubbles generated with the production of phosphoric acid, and to produce phosphoric acid efficiently.
Claims (3)
で表わされる化合物よりなるリン酸製造工程用消泡剤。The following general formula (1)
An antifoaming agent for a phosphoric acid production process comprising a compound represented by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10955497A JP3696368B2 (en) | 1997-04-25 | 1997-04-25 | Antifoaming agent for phosphoric acid production process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10955497A JP3696368B2 (en) | 1997-04-25 | 1997-04-25 | Antifoaming agent for phosphoric acid production process |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10296007A JPH10296007A (en) | 1998-11-10 |
JP3696368B2 true JP3696368B2 (en) | 2005-09-14 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP10955497A Expired - Fee Related JP3696368B2 (en) | 1997-04-25 | 1997-04-25 | Antifoaming agent for phosphoric acid production process |
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JP (1) | JP3696368B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106964178A (en) * | 2017-04-18 | 2017-07-21 | 云南佳贝节能科技有限公司 | A kind of phosphoric acid processes special defoamer and preparation method thereof |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3607189B2 (en) | 2000-06-26 | 2005-01-05 | ファイルド株式会社 | Hair iron with iron press cover |
CN100523006C (en) * | 2003-03-13 | 2009-08-05 | 株式会社日本触媒 | Surfactant for emulsion polymerization, polymer emulsion composition obtained with the surfactant, and adhesive for fiber flocking comprising the composition |
JP5433829B2 (en) * | 2009-02-09 | 2014-03-05 | サンノプコ株式会社 | Antifoaming agent and resin containing the same |
-
1997
- 1997-04-25 JP JP10955497A patent/JP3696368B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106964178A (en) * | 2017-04-18 | 2017-07-21 | 云南佳贝节能科技有限公司 | A kind of phosphoric acid processes special defoamer and preparation method thereof |
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JPH10296007A (en) | 1998-11-10 |
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