WO2020085020A1 - 炭酸ランタン水和物の製造方法 - Google Patents
炭酸ランタン水和物の製造方法 Download PDFInfo
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- WO2020085020A1 WO2020085020A1 PCT/JP2019/038872 JP2019038872W WO2020085020A1 WO 2020085020 A1 WO2020085020 A1 WO 2020085020A1 JP 2019038872 W JP2019038872 W JP 2019038872W WO 2020085020 A1 WO2020085020 A1 WO 2020085020A1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
Definitions
- the present invention relates to a method for producing lanthanum carbonate hydrate.
- Lanthanum carbonate hydrate is used as a therapeutic agent for hyperphosphatemia in patients with chronic renal failure. It is known that lanthanum carbonate 3-6 hydrate can be produced by reacting an acid that gives a soluble salt of lanthanum with lanthanum oxide and drying the obtained wet cake of lanthanum carbonate octahydrate. (Patent Document 1)
- lanthanum oxide as a raw material contains elemental impurities such as lead, arsenic, and vanadium, for example, lead is 0.5 ppm or less and arsenic is 1 according to ICH (International Conference on Harmonization of Pharmaceutical Regulations) guidelines for lanthanum carbonate hydrate.
- ICH International Conference on Harmonization of Pharmaceutical Regulations
- carbonate is added to an aqueous solution obtained by reacting lanthanum oxide with an acid that gives a soluble salt of lanthanum to adjust the pH of the aqueous solution to 2.9 to 4.5 and remove the solid content produced.
- a lanthanum carbonate hydrate can be obtained by adjusting the pH to 5.5 to 7 by adding carbonate to the liquid content.
- the first step is a step of adding a carbonate to an aqueous solution obtained by reacting lanthanum oxide with an acid that gives a soluble salt of lanthanum, and removing a solid content produced.
- Examples of the acid that gives a soluble salt of lanthanum include hydrochloric acid, nitric acid, and sulfuric acid, and hydrochloric acid is usually used.
- the amount of the acid used is generally 6 to 10 mol for a monovalent acid and 3 to 5 mol for a divalent acid with respect to 1 mol of lanthanum oxide.
- This reaction is usually carried out by a method in which an acid is continuously added dropwise, intermittently added, or added all at once to an aqueous suspension of lanthanum oxide.
- carbonate to the aqueous solution obtained above.
- the carbonate include sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium hydrogen carbonate, ammonium carbonate, and ammonium hydrogen carbonate, and sodium carbonate is usually used.
- the amount of the carbonate used is generally 0.1 to 0.75 mol in the case of sodium carbonate, potassium carbonate or ammonium carbonate with respect to 1 mol of lanthanum oxide, and the amount of sodium hydrogen carbonate, potassium hydrogen carbonate or ammonium hydrogen carbonate is generally used. Is 0.2 to 1.5 mol.
- the carbonate may be added dropwise in the form of an aqueous solution. When the amount of acid required to obtain the aqueous solution is excessive, the theoretical amount required for neutralization is added. Thus, the pH of the aqueous solution is adjusted to 2.9 to 4.5, preferably 3.2 to 4.2.
- the generated solid content is removed by solid-liquid separation operations such as filtration and decantation. Further, it is preferable that the solid content is washed with water, and the washing liquid is added to the liquid content such as the filtrate and the supernatant liquid and then subjected to the second step.
- the solid content is mainly composed of lanthanum carbonate hydrate and contains elemental impurities derived from lanthanum oxide as a raw material. Seed crystals of lanthanum carbonate hydrate can be added or the temperature can be adjusted to accelerate the precipitation of solids.
- the temperature for precipitating the solid is usually 1 to 65 ° C., preferably 20 to 30 ° C., and this temperature is maintained, for example, for 5 minutes to 24 hours, preferably for 30 minutes to 4 hours.
- the second step is to add carbonic acid by adding a carbonate to the liquid obtained in the first step or a liquid obtained by adding a washing liquid to the liquid, if necessary, to give a soluble salt of lanthanum.
- This is a step of obtaining a lanthanum hydrate. Examples of acids and carbonates that give soluble salts of lanthanum used here are the same as those used in the first step.
- the amount of the acid used is generally 0 to 0.7 mol for a monovalent acid and 0 to 0.35 mol for a divalent acid with respect to 1 mol of the initial lanthanum oxide.
- the acid is added by a method such as dripping, intermittently dropping, or adding all at once.
- the temperature at which the acid is added is usually 1 to 65 ° C, preferably 25 to 55 ° C.
- Carbonate is added until the pH of the liquid reaches 5.5-7.
- the temperature at which the carbonate is added is usually 1 to 65 ° C., preferably 25 to 55 ° C., and generally 1 hour to 10 hours, preferably 3 hours to 7 hours.
- the carbonate may be added dropwise in the form of an aqueous solution.
- Lanthanum carbonate hydrate precipitates as a result of adding carbonate, but seed crystals of lanthanum carbonate hydrate can be added or the temperature can be adjusted to promote precipitation.
- the temperature for precipitating the solid is usually 1 to 65 ° C., preferably 25 to 55 ° C., and this temperature is maintained, for example, for 5 minutes to 24 hours, preferably for 30 minutes to 2 hours.
- the precipitated lanthanum carbonate hydrate can be obtained by solid-liquid separation operations such as filtration and decantation. If necessary, wash with water.
- the amount of water used for washing is usually 10 to 40 parts by weight, preferably 20 to 30 parts by weight, based on 1 part by weight of the initial lanthanum oxide.
- the lanthanum carbonate hydrate thus obtained is usually octahydrate, and can be dried to 3 to 6 hydrate by a conventional method.
- the drying temperature is usually in the range of 20 to 100 ° C.
- Example 1 Water (3 parts by weight) was added to lanthanum oxide (1 part by weight), the mixture was heated to 40 ° C., 35% hydrochloric acid (a ratio of 6.3 mol to 1 mol of lanthanum oxide) was added dropwise, and a lanthanum chloride aqueous solution was added. Obtained. The liquid temperature during this period was 39 to 52 ° C. A 16.4% sodium carbonate aqueous solution (ratio of 0.22 mol to 1 mol of lanthanum oxide) was added dropwise to the obtained lanthanum chloride aqueous solution at 25 ° C. over 40 minutes to obtain lanthanum carbonate hydrate at pH 3.0. Seed crystals were inoculated. After keeping the temperature at 25 ° C.
- a 16.4% sodium carbonate aqueous solution (ratio of 0.074 mol to 1 mol of lanthanum oxide) was added dropwise over 10 minutes to adjust the pH to 4.0. After keeping the temperature at 25 ° C. for 40 minutes, the generated crystals were filtered and washed with water (1 part by weight). The filtrate and the washing solution were combined, heated to 50 ° C., and 35% hydrochloric acid (ratio of 0.52 mol to 1 mol of lanthanum oxide) was added. A 16.4% aqueous sodium carbonate solution (ratio of 0.31 mol to 1 mol of lanthanum oxide) was added dropwise at 50 ° C.
- the obtained crystals were washed with water (24 parts by weight), dried at 40 ° C (bath temperature) and then dried under reduced pressure at 90 ° C to obtain lanthanum carbonate hydrate in a yield of 94%.
- the amount of elemental impurities in the obtained crystal was measured by inductively coupled plasma mass spectrometry.
- Example 2 Water (3 parts by weight) was added to lanthanum oxide (1 part by weight), the mixture was heated to 40 ° C., 35% hydrochloric acid (a ratio of 6.3 mol to 1 mol of lanthanum oxide) was added dropwise, and a lanthanum chloride aqueous solution was added. Obtained. During this period, the liquid temperature was 38 to 55 ° C. A 16.4% sodium carbonate aqueous solution (ratio of 0.22 mol to 1 mol of lanthanum oxide) was added dropwise to the obtained lanthanum chloride aqueous solution at 25 ° C. over 30 minutes to obtain lanthanum carbonate hydrate at pH 3.9. Seed crystals were inoculated. After keeping the temperature at 25 ° C.
- a 16.4% sodium carbonate aqueous solution (ratio of 0.22 mol to 1 mol of lanthanum oxide) was added dropwise over 30 minutes to adjust the pH to 3.7. After keeping the temperature at 25 ° C. for 30 minutes, the generated crystals were filtered and washed with water (1 part by weight). The filtrate and the washing solution were combined, the temperature was raised to 30 ° C., and seed crystals of lanthanum carbonate hydrate were inoculated. A 16.4% aqueous sodium carbonate solution was added dropwise over 4 hours and 40 minutes to adjust the pH to 6.2. After keeping the temperature at 30 ° C. for 17 hours, the precipitated crystals were filtered.
- the obtained crystals were washed with water (24 parts by weight) and then dried at 40 ° C. (bath temperature) to obtain lanthanum carbonate hydrate with a yield of 89%.
- the amount of elemental impurities in the obtained crystal was measured by inductively coupled plasma mass spectrometry.
- Example 3 Water (3 parts by weight) was added to lanthanum oxide (1 part by weight), the mixture was heated to 40 ° C., 35% hydrochloric acid (a ratio of 6.3 mol to 1 mol of lanthanum oxide) was added dropwise, and a lanthanum chloride aqueous solution was added. Obtained. The liquid temperature during this period was 39 to 52 ° C. A 16.4% sodium carbonate aqueous solution (ratio of 0.21 mol to 1 mol of lanthanum oxide) was added dropwise to the obtained lanthanum chloride aqueous solution at 25 ° C. over 40 minutes to adjust the pH to 2.5, and lanthanum carbonate hydrate was prepared. Seed crystals were inoculated.
- a 16.4% sodium carbonate aqueous solution (ratio of 0.0013 mol to 1 mol of lanthanum oxide) was dropped, and the temperature was kept for 30 minutes. Then, a 16.4% sodium carbonate aqueous solution (ratio of 0.52 mol to 1 mol of lanthanum oxide) was added dropwise at 25 ° C. over 75 minutes to adjust the pH to 3.7. After keeping the temperature at 25 ° C. for 45 minutes, the generated crystals were filtered and washed with water (1 part by weight). The filtrate and the washing solution were combined, the temperature was raised to 50 ° C., and 35% hydrochloric acid (ratio of 0.52 mol to 1 mol of lanthanum oxide) was added.
- a 16.4% aqueous sodium carbonate solution (ratio of 0.31 mol to 1 mol of lanthanum oxide) was added dropwise at 50 ° C. over 45 minutes to inoculate a seed crystal of lanthanum carbonate hydrate at pH 2.5.
- a 16.4% sodium carbonate aqueous solution (ratio of 0.038 mol to 1 mol of lanthanum oxide)
- the mixture was kept warm at 50 ° C. for 40 minutes.
- a 16.4% sodium carbonate aqueous solution was added dropwise at 50 to 51 ° C. over 4 hours and 10 minutes to adjust the pH to 6.0. After keeping the temperature at 50 ° C for 20 minutes, it was cooled to 30 to 35 ° C.
- the precipitated crystals were filtered.
- the obtained crystals were washed with water (24 parts by weight), dried at 40 ° C. (bath temperature) and then dried under reduced pressure at 90 ° C. to obtain lanthanum carbonate hydrate with a yield of 80%.
- the amount of elemental impurities in the obtained crystal was measured by inductively coupled plasma mass spectrometry.
- Reference Example Water (3 parts by weight) was added to lanthanum oxide (1 part by weight), and the mixture was heated to 40 ° C. and 35% hydrochloric acid (a ratio of 6.3 mol to 1 mol of lanthanum oxide) was added dropwise to the lanthanum chloride. An aqueous solution was obtained. The liquid temperature during this period was 39 to 52 ° C. 35% Hydrochloric acid (ratio of 0.52 mol to 1 mol of lanthanum oxide) was added to the obtained lanthanum chloride aqueous solution. Then, a 16.4% sodium carbonate aqueous solution (a ratio of 0.47 mol to 1 mol of lanthanum oxide) was added dropwise at 25 ° C. over 40 minutes.
- Seed crystals of lanthanum carbonate hydrate at pH 2.8 were inoculated. After dropwise addition of a 16.4% aqueous sodium carbonate solution (ratio of 0.0013 mol to 1 mol of lanthanum oxide), the mixture was kept warm at 25 ° C. for 30 minutes. At 25 ° C., a 16.4% sodium carbonate aqueous solution (ratio of 0.074 mol to 1 mol of lanthanum oxide) was added dropwise over 10 minutes. After keeping the temperature at 25 ° C. for 30 minutes, the temperature was raised to 50 ° C., and a 16.4% sodium carbonate aqueous solution was added dropwise at 49 to 50 ° C. over 4 hours and 40 minutes to adjust the pH to 5.7.
- a 16.4% sodium carbonate aqueous solution ratio of 0.0013 mol to 1 mol of lanthanum oxide
- Table 1 shows the contents (ppm) of lead (Pb), arsenic (As), and vanadium (V) in the lanthanum carbonate hydrates and the raw material lanthanum oxide obtained in each Example and Reference Example.
- Example 4 Water (3 parts by weight) was added to lanthanum oxide (1 part by weight), the mixture was heated to 40 ° C., 35% hydrochloric acid (a ratio of 6.3 mol to 1 mol of lanthanum oxide) was added dropwise, and a lanthanum chloride aqueous solution was added. Obtained. The liquid temperature during this period was 40 to 50 ° C. To the obtained lanthanum chloride aqueous solution, a 15.1% ammonium carbonate aqueous solution (ratio of 0.22 mol to 1 mol of lanthanum oxide) was added dropwise at 25 ° C. over 30 minutes. Seed crystals of lanthanum carbonate hydrate were inoculated at pH 3.7 and kept warm for 30 minutes.
- a 15.1% ammonium carbonate aqueous solution (ratio of 0.52 mol to 1 mol of lanthanum oxide) was added dropwise over 55 minutes to adjust the pH to 3.6. After keeping the temperature at 25 ° C. for 40 minutes, the generated crystals were filtered and washed with water (1 part by weight). The filtrate and the washing solution were combined, the temperature was raised to 30 ° C., and seed crystals of lanthanum carbonate hydrate were inoculated. A 15.1% ammonium carbonate aqueous solution was added dropwise over 4 hours and 30 minutes to adjust the pH to 6.0. After keeping the temperature at 30 ° C. for 1 hour and 10 minutes, the precipitated crystals were filtered.
- the obtained crystals were washed with water (24 parts by weight) and dried under reduced pressure at 40 ° C (bath temperature) to obtain lanthanum carbonate hydrate with a yield of 81%.
- the amount of elemental impurities in the obtained crystal was measured by inductively coupled plasma mass spectrometry.
- Example 5 Water (4 parts by weight) was added to lanthanum oxide (1 part by weight), and the mixture was heated to 40 ° C. and 70% nitric acid (a ratio of 6.3 mol to 1 mol of lanthanum oxide) was added dropwise to the lanthanum nitrate aqueous solution. Obtained. The liquid temperature during this period was 40 to 67 ° C. To the obtained lanthanum nitrate aqueous solution, a 15.1% ammonium carbonate aqueous solution (ratio of 0.22 mol to 1 mol of lanthanum oxide) was added dropwise at 25 ° C. over 30 minutes. Seed crystals of lanthanum carbonate hydrate were inoculated at pH 3.6 and kept warm for 30 minutes.
- a 15.1% ammonium carbonate aqueous solution (ratio of 0.52 mol to 1 mol of lanthanum oxide) was added dropwise over 25 minutes to adjust the pH to 3.5. After keeping the temperature at 25 ° C. for 30 minutes, the generated crystals were filtered and washed with water (1 part by weight). The filtrate and washings were combined and seeded with lanthanum carbonate hydrate seed crystals at 27 ° C.
- a 15.1% ammonium carbonate aqueous solution was added dropwise over 3 hours and 45 minutes to adjust the pH to 6.0. After keeping the temperature at 30 ° C. for 16 hours and 40 minutes, the precipitated crystals were filtered.
- the obtained crystals were washed with water (24 parts by weight) and then dried under reduced pressure at 40 ° C. (bath temperature) to obtain lanthanum carbonate hydrate with a yield of 80%.
- the amount of elemental impurities in the obtained crystal was measured by inductively coupled plasma mass spectrometry.
- lanthanum carbonate hydrate used as a therapeutic agent for hyperphosphatemia in a patient with chronic renal failure can be produced in high purity with less elemental impurities.
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Abstract
Description
第一の工程は、酸化ランタンとランタンの可溶性塩を与える酸とを反応させて得られる水溶液に炭酸塩を加え、生成する固体分を除去する工程である。
ここで使用されるランタンの可溶性塩を与える酸及び炭酸塩の例は第一の工程で使用される物と同じである。
酸化ランタン(1重量部)に水(3重量部)を加え、40℃に加温して35%塩酸(酸化ランタン1モルに対して6.3モルの割合)を滴下し、塩化ランタン水溶液を得た。この間の液温は39~52℃であった。得られた塩化ランタン水溶液に25℃で16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.22モルの割合)を40分間かけて滴下し、pH3.0で炭酸ランタン水和物の種晶を接種した。30分間25℃に保温後、16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.074モルの割合)を10分間かけて滴下しpH4.0とした。40分間25℃で保温した後、生成した結晶を濾過し水(1重量部)で洗浄した。濾液と洗浄液とを合わせ、50℃に昇温して35%塩酸(酸化ランタン1モルに対して0.52モルの割合)を加えた。16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.31モルの割合)を50℃で30分かけて滴下しpH2.5で炭酸ランタン水和物の種晶を接種した。16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.041モルの割合)を滴下後、30分間50℃で保温した。続いて、16.4%炭酸ナトリウム水溶液を4時間45分かけて滴下し、pH5.7とした。この間の液温は49~50℃であった。15分間50℃に保温した後、30~35℃まで冷却した。30~35℃で21.5時間保温後、析出した結晶を濾過した。得られた結晶を水(24重量部)で洗浄後、40℃(浴温)で乾燥、次いで90℃の減圧下で乾燥して炭酸ランタン水和物を収率94%で得た。得られた結晶中の元素不純物量は誘導結合プラズマ質量分析法にて測定した。
酸化ランタン(1重量部)に水(3重量部)を加え、40℃に加温して35%塩酸(酸化ランタン1モルに対して6.3モルの割合)を滴下し、塩化ランタン水溶液を得た。この間の液温は38~55℃であった。得られた塩化ランタン水溶液に25℃で16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.22モルの割合)を30分間かけて滴下し、pH3.9で炭酸ランタン水和物の種晶を接種した。30分間25℃に保温後、16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.22モルの割合)を30分間かけて滴下しpH3.7とした。30分間25℃で保温した後、生成した結晶を濾過し水(1重量部)で洗浄した。濾液と洗浄液とを合わせ、30℃に昇温し、炭酸ランタン水和物の種晶を接種した。16.4%炭酸ナトリウム水溶液を4時間40分かけて滴下し、pH6.2とした。30℃で17時間保温後、析出した結晶を濾過した。得られた結晶を水(24重量部)で洗浄後、40℃(浴温)で乾燥して、炭酸ランタン水和物を収率89%で得た。得られた結晶中の元素不純物量は誘導結合プラズマ質量分析法にて測定した。
酸化ランタン(1重量部)に水(3重量部)を加え、40℃に加温して35%塩酸(酸化ランタン1モルに対して6.3モルの割合)を滴下し、塩化ランタン水溶液を得た。この間の液温は39~52℃であった。得られた塩化ランタン水溶液に25℃で16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.21モルの割合)を40分間かけて滴下してpH2.5として炭酸ランタン水和物の種晶を接種した。さらに16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.0013モルの割合)を滴下後、30分間保温した。続いて、25℃で16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.52モルの割合)を75分間かけて滴下しpH3.7とした。45分間25℃で保温後、生成した結晶を濾過し水(1重量部)で洗浄した。濾液と洗浄液とを合わせ、50℃に昇温し、35%塩酸(酸化ランタン1モルに対して0.52モルの割合)を加えた。16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.31モルの割合)を50℃で45分間かけて滴下し、pH2.5で炭酸ランタン水和物の種晶を接種した。16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.038モルの割合)を滴下後、40分間50℃で保温した。続いて、50~51℃で16.4%炭酸ナトリウム水溶液を4時間10分かけて滴下し、pH6.0とした。20分間50℃で保温後、30~35℃まで冷却した。13時間30~35℃で保温後、析出した結晶を濾過した。得られた結晶を水(24重量部)で洗浄後、40℃(浴温)で乾燥、次いで90℃の減圧下で乾燥して炭酸ランタン水和物を収率80%で得た。得られた結晶中の元素不純物量は誘導結合プラズマ質量分析法にて測定した。
酸化ランタン(1重量部)に水(3重量部)を加え、40℃に加温して35%塩酸(酸化ランタン1モルに対して6.3モルの割合)を滴下し、塩化ランタン水溶液を得た。この間の液温は39~52℃であった。得られた塩化ランタン水溶液に35%塩酸(酸化ランタン1モルに対して0.52モルの割合)を加えた。続いて、25℃で16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.47モルの割合)を40分かけて滴下した。pH2.8で炭酸ランタン水和物の種晶を接種した。16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.0013モルの割合)を滴下後、30分間25℃で保温した。25℃で16.4%炭酸ナトリウム水溶液(酸化ランタン1モルに対して0.074モルの割合)を10分間かけて滴下した。30分間25℃で保温後、50℃に昇温し、49~50℃で16.4%炭酸ナトリウム水溶液を4時間40分かけて滴下し、pH5.7とした。15分間50℃で保温後、30~35℃まで冷却した。30~35℃で17時間保温後、析出した結晶を濾過した。得られた結晶を水(24重量部)で洗浄後、40℃(浴温)で乾燥、次いで90℃の減圧下で乾燥して炭酸ランタン水和物を収率97%で得た。得られた結晶中の元素不純物量は誘導結合プラズマ質量分析法にて測定した。
酸化ランタン(1重量部)に水(3重量部)を加え、40℃に加温して35%塩酸(酸化ランタン1モルに対して6.3モルの割合)を滴下し、塩化ランタン水溶液を得た。この間の液温は40~50℃であった。得られた塩化ランタン水溶液に25℃で15.1%炭酸アンモニウム水溶液(酸化ランタン1モルに対して0.22モルの割合)を30分間かけて滴下した。pH3.7で炭酸ランタン水和物の種晶を接種し、30分保温した。15.1%炭酸アンモニウム水溶液(酸化ランタン1モルに対して0.52モルの割合)を55分かけて滴下しpH3.6とした。40分間25℃で保温後、生成した結晶を濾過し水(1重量部)で洗浄した。濾液と洗浄液とを合わせ、30℃に昇温し、炭酸ランタン水和物の種晶を接種した。15.1%炭酸アンモニウム水溶液を4時間30分かけて滴下し、pH6.0とした。1時間10分、30℃で保温後、析出した結晶を濾過した。得られた結晶を水(24重量部)で洗浄後、減圧下40℃(浴温)で乾燥して炭酸ランタン水和物を収率81%で得た。得られた結晶中の元素不純物量は誘導結合プラズマ質量分析法にて測定した。
酸化ランタン(1重量部)に水(4重量部)を加え、40℃に加温して70%硝酸(酸化ランタン1モルに対して6.3モルの割合)を滴下し、硝酸ランタン水溶液を得た。この間の液温は40~67℃であった。得られた硝酸ランタン水溶液に25℃で15.1%炭酸アンモニウム水溶液(酸化ランタン1モルに対して0.22モルの割合)を30分間かけて滴下した。pH3.6で炭酸ランタン水和物の種晶を接種し、30分保温した。15.1%炭酸アンモニウム水溶液(酸化ランタン1モルに対して0.52モルの割合)を25分かけて滴下しpH3.5とした。30分間25℃で保温後、生成した結晶を濾過し水(1重量部)で洗浄した。濾液と洗浄液とを合わせ、27℃で炭酸ランタン水和物の種晶を接種した。15.1%炭酸アンモニウム水溶液を3時間45分かけて滴下し、pH6.0とした。16時間40分、30℃で保温後、析出した結晶を濾過した。得られた結晶を水(24重量部)で洗浄後、減圧下40℃(浴温)で乾燥して炭酸ランタン水和物を収率80%で得た。得られた結晶中の元素不純物量は誘導結合プラズマ質量分析法にて測定した。
Claims (6)
- 工程1:酸化ランタンとランタンの可溶性塩を与える酸とを反応させて得られる水溶液に炭酸塩を加えて水溶液のpHを2.9~4.5とし、生成する固体分を除去する工程、及び
工程2:工程1で得られた液体分に炭酸塩を加えてpHを5.5~7とする工程
を含む炭酸ランタン水和物の製造方法。 - 工程1及び工程2の炭酸塩が炭酸ナトリウム、炭酸水素ナトリウム、炭酸カリウム、炭酸水素カリウム、炭酸アンモニウム又は炭酸水素アンモニウムである請求項1に記載の方法。
- 工程1及び工程2の炭酸塩が炭酸ナトリウムである請求項1に記載の方法。
- 工程1の可溶性塩を与える酸が塩酸、硝酸又は硫酸である請求項1、2又は3に記載の方法。
- 工程1におけるランタンの可溶性塩を与える酸が塩酸である請求項1、2又は3に記載の方法。
- 工程1:酸化ランタンと塩酸とを反応させて得られる水溶液に炭酸ナトリウムを加えて水溶液のpHを3.2~4.2とし、生成する固体分を除去する工程、及び
工程2:工程1で得られた液体分に炭酸ナトリウムを加えてpHを5.5~7とする工程
を含む請求項1に記載の方法。
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