JP4407484B2 - Method for removing aluminum compound - Google Patents
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Description
本発明は、遷移金属と有機アルミニウムからなる触媒を用いてポリマーを製造するプロセスにおいてポリマー溶液の脱灰処理に用いられた処理水中に含まれるアルミニウム化合物の除去に関するものである。 The present invention relates to the removal of the aluminum compound contained in the processing in water used for the demineralization of the polymer solution in the process of producing a polymer using a catalyst comprising a transition metal and an organoaluminum.
処理水中に含まれる金属などを分離除去する方法としては、例えば、特開２００２−２３３８８２号公報（特許文献１）には、銅および錫を含む重金属の水溶液から重金属を回収するにあたり、この水溶液にＣｕ（Ｉ）イオンを存在させ、アルカリ性化合物を添加混合した後、引き続いてこの水溶液に酸化剤を添加混合して酸化処理する方法が記載されている。 As a method for separating and removing metals and the like contained in treated water, for example, JP 2002-233882 A (Patent Document 1) discloses that when recovering heavy metals from an aqueous solution of heavy metals containing copper and tin, A method is described in which Cu (I) ions are present, an alkaline compound is added and mixed, and then an oxidizing agent is added to and mixed with this aqueous solution for oxidation treatment.
また、特開２００３−２４５６７５号公報（特許文献２）には、処理水中に含まれる溶存フッ素イオンを除去する方法において、該処理水中に希土類イオンを存在させ、ｐＨを５〜１２に調整することによって該溶存フッ素イオンを難溶性物質として沈殿させ、次に発生したスラッジを原水に返送することで、処理水中に含まれる溶存フッ素イオンをより低濃度まで除去する方法と発生スラッジ量を低減させる方法が記載されている。 Further, Japanese Patent 2003-245675 (Patent Document 2), a method of removing dissolved fluorine ions contained in the treated water, the presence of rare earth ions in the treatment of water, adjusted to pH 5-12 the solution exist fluorine ions are precipitated as sparingly soluble substances by, by returning then generated sludge raw water, a method of removing dissolved fluorine ions contained in the treated water to a lower concentration generated amount of sludge A method of reducing is described.
従来から、処理水中に含まれるアルミニウム化合物の除去方法としては、処理水をアルカリ性に調整した後、水中にポリアクリルアミド系高分子などの凝集剤を添加し、アルミニウム化合物の沈降分離させる方法が行われている。しかしながら、処理水中に含まれるアルミニウム化合物の組成を考慮せずに、凝集剤を添加しているため、場合によっては、凝集剤が有効に作用されず、沈降分離に時間を要する場合があった。
本発明は、処理水中に含まれるアルミニウム化合物を除去する方法において、凝集剤を有効に作用させ、沈降分離の時間を短縮化することを課題とする。 The present invention is a method of removing aluminum compounds contained in the treated water, effectively allowed to act flocculant, it is an object to shorten the time for settling.
本発明は、遷移金属と有機アルミニウムからなる触媒を用いてポリマーを製造するプロセスにおいてポリマー溶液の脱灰処理に用いられた処理水中に含まれるアルミニウム化合物を除去する方法であって、該脱灰処理が１００℃未満の温度で行われた後、１００℃以上の温度で行われ、それぞれの処理水を混合した処理水中に含まれるアルミニウム化合物の構成を、下式（１）の範囲になるように調節した後、凝集剤を添加して沈降分離することを特徴とするアルミニウム化合物の除去方法に関する。 The present invention relates to a method of removing aluminum compounds contained in the processing in water used for the demineralization of the polymer solution in the process of producing a polymer using a catalyst comprising a transition metal and an organoaluminum, dehydration ash After the treatment is performed at a temperature of less than 100 ° C., the treatment is performed at a temperature of 100 ° C. or higher, and the composition of the aluminum compound contained in the treated water in which the treated water is mixed is in the range of the following formula (1). It is related with the removal method of the aluminum compound characterized by adding a flocculant and carrying out sedimentation separation after adjusting to (3) .
０．２≦［アルミニウム化合物（Ａ）］÷［アルミニウム化合物全体］≦０．８ （１）
（但し、［アルミニウム化合物全体］とは、該処理水中に含まれる全アルミニウム化合物量を示し、［アルミニウム化合物（Ａ）］とは、該処理水をＰＨ３に処理した場合、水中に溶解する全アルミニウム化合物量を示す。）
0.2 ≦ [aluminum compound (A)] ÷ [whole aluminum compound] ≦ 0.8 (1)
(However, [whole aluminum compound] means the total amount of aluminum compound contained in the treated water, and [aluminum compound (A)] means all aluminum dissolved in water when the treated water is treated with PH3. Indicates the amount of compound.)
本発明によって、処理水中に含まれるアルミニウム化合物を除去する方法において、凝集剤を有効に作用させ、沈降分離の時間を短縮化することができる。 The present invention, a method for removing aluminum compounds contained in the treated water, effectively allowed to act flocculant, it is possible to shorten the time for settling.
本発明において、処理水中に含まれるアルミニウム化合物を除去する方法は、処理水中のアルミニウム化合物の組成を制御することにより、凝集剤を有効に作用させて、沈降時間の低減をはかるものである。 Method of removing the aluminum compound contained Oite, in treated water in the present invention, by controlling the composition of the aluminum compound in the treated water, and effectively allowed to act flocculant, which reduce the settling time It is.
アルミニウム化合物の組成を制御する方法としては、処理水のサンプルをＰＨ３とした時に溶解するものをアルミニウム化合物（Ａ）として、下式（１）を
満足する様に、処理水の組成を制御するものである。
As a method for controlling the composition of the aluminum compounds, those which dissolve when a sample of treated water and PH3 as the aluminum compound (A), so as to satisfy the following formula (1), controlling the composition of the treated water Is.
０．２≦［アルミニウム化合物（Ａ）］÷［アルミニウム化合物全体］≦０．８ （１） 0.2 ≦ [aluminum compound (A)] ÷ [whole aluminum compound] ≦ 0.8 (1)
より好ましくは、下式（２）を満足する様に、処理水の組成を制御する。 More preferably, the composition of the treated water is controlled so as to satisfy the following formula (2).
０．２５≦［アルミニウム化合物（Ａ）］÷［アルミニウム化合物全体］≦０．６５（２） 0.25 ≦ [aluminum compound (A)] ÷ [whole aluminum compound] ≦ 0.65 (2)
（但し、［アルミニウム化合物全体］とは、該処理水中に含まれる全アルミニウム化合物量を示し、［アルミニウム化合物（Ａ）］とは、該処理水をＰＨ３に処理した場合、水中に溶解する全アルミニウム化合物量を示す。） (However, [whole aluminum compound] means the total amount of aluminum compound contained in the treated water, and [aluminum compound (A)] means all aluminum dissolved in water when the treated water is treated with PH3. Indicates the amount of compound.)
ここで、アルミニウム化合物全体の量を計量する具体的な方法としては、処理水を水酸化ナトリウム水溶液（２ｍｏｌ／ｌ）でＰＨ３に調整し、懸濁状態のまま原子吸光測定装置（島津製AA-660）でアルミニウムを濃度測定し（ｐｐｍ）、これをアルミニウム化合物全体の量とした。 Here, as a specific method for measuring the total amount of the aluminum compound, the treated water is adjusted to PH3 with an aqueous sodium hydroxide solution (2 mol / l), and the atomic absorption measuring device (AA-A made by Shimadzu) is kept in a suspended state. 660), the concentration of aluminum was measured (ppm), and this was used as the total amount of the aluminum compound.
アルミニウム化合物（Ａ）を計量する具体的な方法としては、処理水を水酸化ナトリウム水溶液（２ｍｏｌ／ｌ）でＰＨ３に調整した後、この懸濁溶液をろ紙（アドバンテック社製 ＮＯ．６）で懸濁物をろ別し、この母液を原子吸光装置（島津製AA-660）でアルミニウムを濃度測定し（ｐｐｍ）、アルミニウム化合物（Ａ）の量とした。 As a specific method for measuring the aluminum compound (A), the treated water is adjusted to PH3 with an aqueous sodium hydroxide solution (2 mol / l), and this suspension solution is suspended with a filter paper (No. 6 manufactured by Advantech). The turbid matter was filtered off, and the concentration of aluminum in this mother liquor was measured with an atomic absorption device (AA-660 manufactured by Shimadzu) (ppm) to obtain the amount of the aluminum compound (A).
本発明おいて、処理水のアルミニウム化合物の組成を上記の式を満足するように調製する方法としては、
例えば、アルミニウム化合物（Ａ）を高濃度で含有する処理水と、低濃度で含有する処理水を混合して調整する方法が挙げられる。
In the present invention, as a method of preparing the composition of the aluminum compound of the treated water so as to satisfy the above formula,
For example, the method of mixing and adjusting the treated water containing aluminum compound (A) by high concentration and the treated water containing low concentration is mentioned.
本発明が好適に適用できるアルミニウム化合物含有する処理水としては、
例えば、遷移金属と有機アルミニウムからなる触媒を用いてブタジエンを重合してポリブタジエンを製造するプロセスにおいて、ポリマー重合溶液の重合停止及び触媒残さを取り除く為の脱灰処理に用いられた処理水である。処理水のアルミニウム組成は脱灰処理温度により異なる。脱灰処理温度が１００℃未満でポリマー重合溶液と処理水とを撹拌混合した後、ポリマー溶液から分離した処理水、脱灰処理温度が１００℃以上の条件で、ポリマー溶液中の溶剤が取り除かれ、凝固したポリマーから分離して得られる処理水が挙げられる。
As treated water containing an aluminum compound to which the present invention can be suitably applied,
For example, in the process of producing polybutadiene by polymerizing butadiene using a catalyst composed of a transition metal and organoaluminum, the treated water is used for deashing treatment for stopping polymerization of the polymer polymerization solution and removing catalyst residues. The aluminum composition of the treated water varies depending on the deashing temperature. After stirring and mixing the polymer polymerization solution and the treated water at a deashing treatment temperature of less than 100 ° C, the solvent in the polymer solution is removed under the condition of the treated water separated from the polymer solution and the deashing treatment temperature of 100 ° C or higher. And treated water obtained by separating from the solidified polymer.
例えば、コバルト錯体を主触媒とし、有機アルミニウムとしてジエチルアルミニウムクロリド２６Ｋｇ（０．２Ｋｍｏｌ）を助触媒として用いて、ブタジエン重合し、ポリブタジエンを１００Ｋｇ含むポリブタジエン溶液１ｍ３を製造する。これに６０℃で７ｍ３の処理水を添加し、撹拌洗混合した後、ポリブタジエン溶液と処理水とを分離する。この処理水中のアルミニウム化合物全体の量は、７２．３ｐｐｍであり、アルミニウム化合物（Ａ）の量は、７２．１ｐｐｍであった。その後、ポリマー溶液を１２０℃のストリッピング槽で７０ｍ３の処理水（その内の１０ｍ３はスチーム）で未反応モノマー、溶媒を除去すると同時にエラストマーを小さなパン屑状のクラムとして凝固させてスラリーとする。必要に応じて、クラムの固結防止剤として界面活性剤を使用する。また、ＰＨを５から７に調節する為に水酸化ナトリウム水溶液を添加する。ストリッッピング槽でクラム状のポリブタジエンと分離された処理水中のアルミニウム化合物全体の量は、４６．９ｐｐｍであり、アルミニウム化合物（Ａ）の量は、４．０ｐｐｍであった。 For example, butadiene polymerization is performed using cobalt complex as the main catalyst and diethylaluminum chloride as organic aluminum, 26 kg (0.2 Kmol) as a co-catalyst, to produce 1 m 3 of polybutadiene solution containing 100 kg of polybutadiene. 7 m 3 treated water is added to this at 60 ° C., and after stirring and mixing, the polybutadiene solution and the treated water are separated. The amount of the total aluminum compounds for this process in water is 72.3Ppm, the amount of aluminum compound (A) was 72.1Ppm. Thereafter, the polymer solution is removed in a stripping tank at 120 ° C. with 70 m 3 treated water (of which 10 m 3 is steam) to remove unreacted monomers and solvent, and at the same time, the elastomer is coagulated as small crumb-like crumbs to form a slurry. To do. If necessary, a surfactant is used as a crumb anti-caking agent. Further, an aqueous sodium hydroxide solution is added to adjust the pH from 5 to 7. Strip Tsu total amount of aluminum compound in the treated water separated crumb-like polybutadiene ping tank is 46.9Ppm, the amount of aluminum compound (A) was 4.0 ppm.
例えば、溶液重合法によって得られるＢＲ、ＳＢＲ、ＳＰＢＲなどは触媒、重合条件、重合溶媒などによって重合工程の差はあるが、エラストマ−の分離工程はほぼ同じである。すなわち、重合工程からの重合溶液は溶媒の分離工程へ送られて、ストリッピング槽でスチームによって加熱された熱水中に送り込まれて、未反応モノマー、溶媒を除去すると同時にエラストマーを小さなパン屑状のクラムとして凝固させてスラリーとする。必要に応じて、クラムの固結防止剤として界面活性剤が使用される。 For example, BR, SBR, SPBR and the like obtained by the solution polymerization method have different polymerization steps depending on the catalyst, polymerization conditions, polymerization solvent, etc., but the elastomer separation step is almost the same. That is, the polymerization solution from the polymerization process is sent to a solvent separation process, and is sent into hot water heated by steam in a stripping tank to remove unreacted monomers and solvent, and at the same time, remove the elastomer into small crumbs. The crumb is solidified into a slurry. If necessary, a surfactant is used as an anti-caking agent for crumbs.
高分子凝集剤としては、ポリアクリルアミド、アクリルアミド・アクリル酸ナトリウム塩共重合体、アクリルアミド・ジメチルアミノエチルアクリレートメチルクロライド４級塩共重合体、アクリルアミド・ジメチルアミノエチルメタクリレートメチルクロライド４級塩共重合体、アクリルアミド・アクリル酸ナトリウム塩・ジメチルアミノエチルアクリレートメチルクロライド４級塩共重合体、アクリルアミド・アクリル酸ナトリウム塩・ジメチルアミノエチルメタクリレートメチルクロライド４級塩共重合体を用いることができる。 As the polymer flocculant, polyacrylamide, acrylamide / sodium acrylate copolymer, acrylamide / dimethylaminoethyl acrylate methyl chloride quaternary salt copolymer, acrylamide / dimethylaminoethyl methacrylate methyl chloride quaternary salt copolymer, An acrylamide / sodium acrylate / dimethylaminoethyl acrylate methyl chloride quaternary salt copolymer or an acrylamide / sodium acrylate / dimethylaminoethyl methacrylate methyl chloride quaternary salt copolymer can be used.
上記の遷移金属と有機アルミニウムからなる触媒としては、
具体的には、コバルト化合物、有機アルミニウム化合物及び水からなる触媒、ニッケル化合物、有機アルミニウム化合物及び水からなる触媒、チタン化合物、有機アルミニウム化合物及び水からなる触媒、バナジウム化合物、有機アルミニウム及び水からなる触媒などが挙げられる。
As a catalyst comprising the above transition metal and organoaluminum,
Specifically, a catalyst comprising a cobalt compound, an organoaluminum compound and water, a nickel compound, a catalyst comprising an organoaluminum compound and water, a catalyst comprising a titanium compound, an organoaluminum compound and water, a vanadium compound, an organoaluminum and water. A catalyst etc. are mentioned.
（実施例1）
内径３０ｍｍ、高さ８０ｍｍの円柱型ガラスサンプルびんにアルミニウム１．５ｍｇを含む、式（１）より求められる値が０．２５のアルミニウム化合物の懸濁水溶液を３０ｇを入れ、そこに高分子凝集剤（クリフロックＰＮ−１６３ 栗田工業株式会社製）３．８ｐｐｍになるように加えた。但し、このアルミニウム化合物懸濁水溶液中のアルミニウム化合物の組成は、アルミニウム化合物（Ａ）の割合が９９．７％でアルミニウム化合物全体の濃度が７２．３ｐｐｍの水溶液２３．４ｇとアルミニウム化合物（Ａ）の割合が８．５％でアルミニウム化合物全体の濃度が４６．９ｐｐｍの水溶液１５６．６ｇを混合して、アルミニウム含量の調整に蒸留水０．５ｇを加えて作成した。その後、この懸濁溶液を水酸化ナトリウム水溶液（２ｍｏｌ／ｌ）を用いてｐＨ８に調整し、この中から３０ｇ抜き出した。
懸濁物を十分に分散させた後、静置し、懸濁物堆積層高さを観察した。この間溶液温度を７０℃に保って行った。静置してから３０分間後の懸濁物の堆積層の高さは、２．７ｍｍであった。
(Example 1)
A cylindrical glass sample bottle with an inner diameter of 30 mm and a height of 80 mm contains 1.5 g of aluminum, and 30 g of a suspended aqueous solution of an aluminum compound having a value of 0.25 obtained from formula (1) is added to the polymer flocculant. (Cliff rock PN-163, Kurita Kogyo Co., Ltd.) It added so that it might become 3.8 ppm. However, the composition of the aluminum compound in this aqueous suspension of aluminum compound is such that the ratio of the aluminum compound (A) is 99.7% and the concentration of the entire aluminum compound is 23.4 g of the aqueous solution and the aluminum compound (A). It was prepared by mixing 156.6 g of an aqueous solution having a ratio of 8.5% and a total aluminum compound concentration of 46.9 ppm and adding 0.5 g of distilled water to adjust the aluminum content. Thereafter, this suspension solution was adjusted to pH 8 using an aqueous sodium hydroxide solution (2 mol / l), and 30 g was extracted therefrom.
After fully suspending the suspension, the suspension was allowed to stand and the height of the suspended sediment layer was observed. During this time, the solution temperature was kept at 70 ° C. The height of the deposited layer of the suspension 30 minutes after standing was 2.7 mm.
（実施例２）
実施例１と同様に、静置後、懸濁物堆積層高さの経時変化を観察した。式（１）より求められる値を０．４３に変更した事以外実施例１と同じ。但し、このアルミニウム化合物懸濁水溶液中のアルミニウム化合物の組成は、アルミニウム化合物（Ａ）の割合が９９．７％でアルミニウム化合物全体の濃度が７２．３ｐｐｍの水溶液５０．４ｇとアルミニウム化合物（Ａ）の割合が８．５％でアルミニウム化合物全体の濃度が４６．９ｐｐｍの水溶液１２９．６ｇを混合して、アルミニウム含量の調整に蒸留水１４．５ｇを加えて作成した。静置してから３０分間後の懸濁物の堆積層の高さは、２．９ｍｍであった。
(Example 2)
Similar to Example 1, after standing, the time-dependent change in the height of the suspended sediment layer was observed. Same as Example 1 except that the value obtained from Equation (1) was changed to 0.43. However, the composition of the aluminum compound in this aqueous suspension of aluminum compound is such that 50.4 g of an aqueous solution in which the proportion of the aluminum compound (A) is 99.7% and the concentration of the entire aluminum compound is 72.3 ppm and the aluminum compound (A) The mixture was prepared by mixing 129.6 g of an aqueous solution having a ratio of 8.5% and a concentration of the whole aluminum compound of 46.9 ppm, and adding 14.5 g of distilled water to adjust the aluminum content. The height of the deposited layer of the suspension after 30 minutes from standing was 2.9 mm.
（実施例３）
実施例１と同様に、静置後、懸濁物堆積層高さの経時変化を観察した。式（１）より求められる値を０．６０に変更した事以外実施例１と同じ。但し、このアルミニウム化合物懸濁水溶液中のアルミニウム化合物の組成は、アルミニウム化合物（Ａ）の割合が９９．７％でアルミニウム化合物全体の濃度が７２．３ｐｐｍの水溶液９２．０ｇとアルミニウム化合物（Ａ）の割合が８．５％でアルミニウム化合物全体の濃度が４６．９ｐｐｍの水溶液１０８．０ｇを混合して、アルミニウム含量の調整に蒸留水３４．０ｇを加えて作成した。静置してから３０分間後の懸濁物の堆積層の高さは、４．１ｍｍであった。
(Example 3)
Similar to Example 1, after standing, the time-dependent change in the height of the suspended sediment layer was observed. Same as Example 1 except that the value obtained from equation (1) was changed to 0.60. However, the composition of the aluminum compound in this aqueous suspension of aluminum compound is such that 92.0 g of the aqueous solution in which the proportion of the aluminum compound (A) is 99.7% and the concentration of the entire aluminum compound is 72.3 ppm and the aluminum compound (A) The mixture was prepared by mixing 108.0 g of an aqueous solution having a ratio of 8.5% and a total concentration of 46.9 ppm of aluminum compound, and adding 34.0 g of distilled water to adjust the aluminum content. The height of the deposited layer of the suspension 30 minutes after standing was 4.1 mm.
（実施例４）
実施例１と同様に、静置後、懸濁物堆積層高さの経時変化を観察した。懸濁水溶液のＰＨを９に変更した事以外実施例１と同じ。静置してから３０分間後の懸濁物の堆積層の高さは、２．２ｍｍであった。
Example 4
Similar to Example 1, after standing, the time-dependent change in the height of the suspended sediment layer was observed. Same as Example 1 except that the pH of the aqueous suspension was changed to 9. The height of the deposited layer of the suspension after 30 minutes from standing was 2.2 mm.
（実施例５）
実施例２と同様に、静置後、懸濁物堆積層高さの経時変化を観察した。懸濁水溶液のＰＨを９に変更した事以外実施例１と同じ。静置してから３０分間後の懸濁物の堆積層の高さは、２．８ｍｍであった。
(Example 5)
Similar to Example 2, after standing, the time-dependent change in the height of the suspended sediment layer was observed. Same as Example 1 except that the pH of the aqueous suspension was changed to 9. The height of the deposited layer of the suspension 30 minutes after standing was 2.8 mm.
（実施例６）
実施例３と同様に、静置後、懸濁物堆積層高さの経時変化を観察した。懸濁水溶液のＰＨを９に変更した事以外実施例１と同じ。静置してから３０分間後の懸濁物の堆積層の高さは、３．６ｍｍであった。
(Example 6)
Similar to Example 3, after standing, the time-dependent change in the height of the suspended sediment layer was observed. Same as Example 1 except that the pH of the aqueous suspension was changed to 9. The height of the deposited layer of the suspension 30 minutes after standing was 3.6 mm.
（比較例１）
実施例１と同様に、静置後、懸濁物堆積層高さの経時変化を観察した。式（１）より求められる値を１．００に変更した事以外実施例１と同じ。但し、このアルミニウム化合物懸濁水溶液中のアルミニウム化合物の組成は、アルミニウム化合物（Ａ）の割合が９９．７％でアルミニウム化合物全体の濃度が７２．３ｐｐｍの水溶液２０．７ｇとアルミニウム含量の調整に蒸留水９．２ｇを加えて作成した。静置してから３０分間後の懸濁物の堆積層の高さは、８．０ｍｍであった。
(Comparative Example 1)
Similar to Example 1, after standing, the time-dependent change in the height of the suspended sediment layer was observed. Same as Example 1 except that the value obtained from Equation (1) was changed to 1.00. However, the composition of the aluminum compound in this aqueous aluminum compound suspension is 20.7 g of an aqueous solution in which the proportion of the aluminum compound (A) is 99.7% and the concentration of the entire aluminum compound is 72.3 ppm, and distilled to adjust the aluminum content. Prepared by adding 9.2 g of water. The height of the deposited layer of the suspension after 30 minutes of standing was 8.0 mm.
（比較例２）
実施例１と同様に、静置後、懸濁物堆積層高さの経時変化を観察した。式（１）より求められる値を０．０９に変更した事以外実施例１と同じ。但し、このアルミニウム化合物懸濁水溶液中のアルミニウム化合物の組成は、アルミニウム化合物（Ａ）の割合が８．５％でアルミニウム化合物全体の濃度が４６．９ｐｐｍの水溶液をそのまま用いた。静置してから３０分間後の懸濁物の堆積層の高さは、８．２ｍｍであった。
(Comparative Example 2)
Similar to Example 1, after standing, the time-dependent change in the height of the suspended sediment layer was observed. Same as Example 1 except that the value obtained from Equation (1) was changed to 0.09. However, the composition of the aluminum compound in the aqueous aluminum compound suspension was an aqueous solution in which the proportion of the aluminum compound (A) was 8.5% and the concentration of the entire aluminum compound was 46.9 ppm. The height of the deposited layer of the suspension 30 minutes after standing was 8.2 mm.
Claims (1)
０．２≦［アルミニウム化合物（Ａ）］÷［アルミニウム化合物全体］≦０．８ （１）
（但し、［アルミニウム化合物全体］とは、該処理水中に含まれる全アルミニウム化合物量を示し、［アルミニウム化合物（Ａ）］とは、該処理水をＰＨ３に処理した場合、水中に溶解する全アルミニウム化合物量を示す。） A method of removing aluminum compounds contained in the processing in water used for the demineralization of the polymer solution in the process of producing a polymer using a catalyst comprising a transition metal and an organoaluminum, dehydration ash processing 100 ° C. After being carried out at a temperature of less than 100 ° C. and after adjusting the composition of the aluminum compound contained in the treated water mixed with each treated water so as to be in the range of the following formula (1) A method for removing an aluminum compound, comprising adding a flocculant and performing sedimentation separation.
0.2 ≦ [aluminum compound (A)] ÷ [whole aluminum compound] ≦ 0.8 (1)
(However, [whole aluminum compound] means the total amount of aluminum compound contained in the treated water, and [aluminum compound (A)] means all aluminum dissolved in water when the treated water is treated with PH3. Indicates the amount of compound.)
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