阅读说明：本技术 水合碳酸镧的制造方法 (Method for producing hydrous lanthanum carbonate ) 是由 前田千春 辻浩美 西森信明 于 2019-10-02 设计创作，主要内容包括：使氧化镧与盐酸等能形成镧的可溶性盐的酸反应而得到水溶液,在所得水溶液中加入碳酸钠等碳酸盐而使水溶液的pH为2.9～4.5,去除产生的固体成分,在所得的液体成分中加入碳酸盐而使pH为5.5～7,从而能够制造杂质元素含量少、高纯度的水合碳酸镧。(Lanthanum oxide is reacted with an acid capable of forming a soluble salt of lanthanum, such as hydrochloric acid, to obtain an aqueous solution, a carbonate such as sodium carbonate is added to the aqueous solution so that the pH of the aqueous solution is 2.9 to 4.5, the resulting solid component is removed, and a carbonate is added to the liquid component so that the pH is 5.5 to 7, whereby high-purity lanthanum carbonate hydrate having a low impurity element content can be produced.)

1. A method for producing hydrous lanthanum carbonate, which comprises the steps of:

step 1: a step of reacting lanthanum oxide with an acid capable of forming a soluble salt of lanthanum to obtain an aqueous solution, adding a carbonate to the aqueous solution to adjust the pH of the aqueous solution to 2.9 to 4.5, and removing the generated solid component; and

and a step 2: and a step of adding carbonate to the liquid component obtained in the step 1 to adjust the pH to 5.5 to 7.

2. The method according to claim 1, wherein the carbonate in the step 1 and the step 2 is sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, ammonium carbonate, or ammonium bicarbonate.

3. The method according to claim 1, wherein the carbonate in the step 1 and the step 2 is sodium carbonate.

4. The method according to claim 1, 2 or 3, wherein the acid capable of forming a soluble salt in the step 1 is hydrochloric acid, nitric acid or sulfuric acid.

5. A process according to claim 1, 2 or 3 wherein the acid capable of forming a soluble salt of lanthanum in step 1 is hydrochloric acid.

6. The method of claim 1, comprising the steps of:

step 1: a step of reacting lanthanum oxide with hydrochloric acid to obtain an aqueous solution, adding sodium carbonate to the aqueous solution to adjust the pH of the aqueous solution to 3.2-4.2, and removing the generated solid component; and

and a step 2: and a step of adding sodium carbonate to the liquid component obtained in the step 1 to adjust the pH to 5.5 to 7.

Technical Field

The present invention relates to a method for producing hydrous lanthanum carbonate.

Background

Lanthanum carbonate hydrate is used as a hyperphosphatemia therapeutic agent for patients with chronic renal insufficiency. It is known that lanthanum carbonate trihydrate to hexahydrate can be produced by: an acid capable of forming a soluble salt of lanthanum is reacted with lanthanum oxide, and the resulting wet cake of lanthanum carbonate octahydrate is dried (patent document 1).

Documents of the prior art

Patent document

Patent document 1: US5968976

Disclosure of Invention

When lanthanum carbonate hydrate is used for medical purposes, the amount of impurity elements must be controlled to acceptable levels. Since lanthanum oxide in the raw material contains impurity elements such as lead, arsenic, vanadium, etc., a method for producing, for example, high-purity lanthanum carbonate hydrate satisfying the following criteria is required: according to the guidelines for ICH (International harmonization of medical regulations) on lanthanum carbonate hydrate, lead is below 0.5ppm, arsenic is below 1.5ppm, and vanadium is below 10 ppm.

The invention is a method comprising: lanthanum carbonate containing an impurity element is precipitated by adding carbonate after lanthanum oxide is reacted with an acid, and a solid component containing impurities is removed, and then carbonate is added again to produce a high-purity lanthanum carbonate hydrate.

According to the present invention, lanthanum carbonate hydrate can be obtained by reacting lanthanum oxide with an acid capable of forming a soluble salt of lanthanum to obtain an aqueous solution, adding a carbonate to the aqueous solution to adjust the pH of the aqueous solution to 2.9 to 4.5, removing the generated solid component, and adding a carbonate to the liquid component to adjust the pH to 5.5 to 7.

Detailed Description

Hereinafter, the method of the present invention is described in detail.

The first step is the following steps: lanthanum oxide is reacted with an acid capable of forming a soluble salt of lanthanum to obtain an aqueous solution, and a carbonate is added to the aqueous solution to remove the resulting solid component.

Examples of the acid capable of forming a soluble salt of lanthanum include hydrochloric acid, nitric acid, and sulfuric acid, and hydrochloric acid is generally used. Generally, the amount of the acid used is 6 to 10 moles in the case of a monobasic acid and 3 to 5 moles in the case of a dibasic acid, based on 1 mole of lanthanum oxide. This reaction is generally carried out by the following method: for the aqueous suspension of lanthanum oxide, acid is continuously added dropwise, acid is intermittently added dropwise, acid is added at one time, and the like.

Next, carbonate was added to the above obtained aqueous solution. Examples of the carbonate include sodium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, ammonium carbonate and ammonium hydrogen carbonate, and sodium carbonate is generally used. Generally, the carbonate is used in an amount of 0.1 to 0.75 mole in the case of sodium carbonate, potassium carbonate or ammonium carbonate and in an amount of 0.2 to 1.5 mole in the case of sodium hydrogen carbonate, potassium hydrogen carbonate or ammonium hydrogen carbonate, relative to 1 mole of lanthanum oxide. The carbonate may be added dropwise in the form of an aqueous solution. In the case of an excess of acid required above to obtain an aqueous solution, the theoretical amount required for neutralization is supplemented. Thus, the pH of the aqueous solution is adjusted to 2.9 to 4.5, preferably 3.2 to 4.2.

As a result, the generated solid component is removed by a solid-liquid separation operation such as filtration or decantation. Further, it is preferable that the solid component is washed with water, and the washing liquid is added to a liquid component such as a filtrate or a supernatant and used in the second step. The solid component contains lanthanum carbonate hydrate as a main component and contains impurity elements derived from lanthanum oxide as a raw material. To promote the precipitation of solids, seed crystals of hydrated lanthanum carbonate may be added, or the temperature may be adjusted. The temperature for precipitating the solid is usually 1 to 65 ℃, preferably 20 to 30 ℃, and is kept at this temperature for, for example, 5 minutes to 24 hours, preferably 30 minutes to 4 hours.

The second step is a step of: the lanthanum carbonate hydrate is obtained by adding an acid capable of forming a soluble salt of lanthanum to the liquid component obtained in the first step or a liquid obtained by adding a washing liquid to the liquid component, and then adding a carbonate.

Examples of the acid and carbonate capable of forming a soluble salt of lanthanum used herein are the same as those used in the first step.

Generally, the acid is added by a method such as continuous dropwise addition, intermittent dropwise addition, or one-shot addition, in the case of a monobasic acid, 0 to 0.7 mol, and in the case of a dibasic acid, 0 to 0.35 mol, based on 1 mol of the starting lanthanum oxide. The temperature at which the acid is added is usually 1 to 65 ℃ and preferably 25 to 55 ℃.

Adding carbonate until the pH of the liquid becomes 5.5-7. The temperature at which the carbonate is added is usually 1 to 65 ℃ and preferably 25 to 55 ℃, and the addition is generally carried out for 1 to 10 hours, preferably 3 to 7 hours. The carbonate may be added dropwise in the form of an aqueous solution.

The result after the addition of carbonate is precipitation of hydrous lanthanum carbonate, and in order to promote the precipitation, seed crystals of hydrous lanthanum carbonate may be added, or the temperature may be adjusted. The temperature for precipitating the solid is usually 1 to 65 ℃, preferably 25 to 55 ℃, and is kept at this temperature, for example, for 5 minutes to 24 hours, preferably for 30 minutes to 2 hours. The precipitated hydrous lanthanum carbonate can be obtained by a solid-liquid separation operation such as filtration or decantation. In addition, water washing is performed as necessary. The amount of water used in the water washing is usually 10 to 40 parts by weight, preferably 20 to 30 parts by weight, based on 1 part by weight of the starting lanthanum oxide.

The hydrated lanthanum carbonate obtained as described above is usually octahydrate, and is dried by a conventional method to be tri-to hexahydrate. The drying temperature is usually in the range of 20 to 100 ℃.

Examples

Example 1

To lanthanum oxide (1 part by weight) was added water (3 parts by weight), heated to 40 ℃, and 35% hydrochloric acid (6.3 mol ratio to 1 mol of lanthanum oxide) was added dropwise to obtain an aqueous lanthanum chloride solution. During this period, the liquid temperature is 39-52 ℃. To the obtained lanthanum chloride aqueous solution, a 16.4% sodium carbonate aqueous solution (0.22 mole ratio to 1 mole of lanthanum oxide) was added dropwise at 25 ℃ over 40 minutes, and at pH 3.0, seed crystals of hydrated lanthanum carbonate were seeded. After 30 minutes of incubation at 25 ℃, a 16.4% aqueous solution of sodium carbonate (0.074 mole ratio based on 1 mole of lanthanum oxide) was added dropwise over 10 minutes to adjust the pH to 4.0. After incubation at 25 ℃ for 40 minutes, the resulting crystals were filtered and washed with water (1 part by weight). The filtrate and the washing solution were combined, heated to 50 ℃ and 35% hydrochloric acid (0.52 mole ratio to 1 mole of lanthanum oxide) was added. A16.4% aqueous solution of sodium carbonate (0.31 mole ratio to 1 mole of lanthanum oxide) was added dropwise at 50 ℃ over 30 minutes, and seed crystals of hydrated lanthanum carbonate were seeded at pH 2.5. A16.4% aqueous solution of sodium carbonate (0.041 mole ratio to 1 mole of lanthanum oxide) was added dropwise thereto, followed by incubation at 50 ℃ for 30 minutes. Subsequently, a 16.4% sodium carbonate aqueous solution was added dropwise over 4 hours and 45 minutes to adjust the pH to 5.7. During this period, the liquid temperature is 49-50 ℃. Keeping the temperature at 50 ℃ for 15 minutes, and cooling to 30-35 ℃. Keeping the temperature at 30-35 ℃ for 21.5 hours, and filtering precipitated crystals. The obtained crystals were washed with water (24 parts by weight), and then dried at 40 ℃ (bath temperature) and then at 90 ℃ under reduced pressure to obtain lanthanum carbonate hydrate in a yield of 94%. The amount of impurity elements in the obtained crystal was determined by inductively coupled plasma mass spectrometry.

Example 2

To lanthanum oxide (1 part by weight) was added water (3 parts by weight), heated to 40 ℃, and 35% hydrochloric acid (6.3 mol ratio to 1 mol of lanthanum oxide) was added dropwise to obtain an aqueous lanthanum chloride solution. During this period, the liquid temperature is 38-55 ℃. To the obtained lanthanum chloride aqueous solution, a 16.4% sodium carbonate aqueous solution (0.22 mole ratio to 1 mole of lanthanum oxide) was added dropwise at 25 ℃ over 30 minutes, and seed crystals of hydrated lanthanum carbonate were seeded at pH 3.9. After 30 minutes of incubation at 25 ℃, a 16.4% aqueous solution of sodium carbonate (0.22 mole ratio to 1 mole of lanthanum oxide) was added dropwise over 30 minutes to adjust the pH to 3.7. After 30 minutes of incubation at 25 ℃, the resulting crystals were filtered and washed with water (1 part by weight). The filtrate and the washing liquid are combined, the temperature is raised to 30 ℃, and seed crystals of hydrated lanthanum carbonate are inoculated. A16.4% aqueous solution of sodium carbonate was added dropwise over 4 hours and 40 minutes to adjust the pH to 6.2. After incubation at 30 ℃ for 17 hours, the precipitated crystals were filtered. The obtained crystals were washed with water (24 parts by weight) and then dried at 40 ℃ (bath temperature) to obtain lanthanum carbonate hydrate in a yield of 89%. The amount of impurity elements in the obtained crystal was determined by inductively coupled plasma mass spectrometry.

Example 3

To lanthanum oxide (1 part by weight) was added water (3 parts by weight), heated to 40 ℃, and 35% hydrochloric acid (6.3 mol ratio to 1 mol of lanthanum oxide) was added dropwise to obtain an aqueous lanthanum chloride solution. During this period, the liquid temperature is 39-52 ℃. To the obtained lanthanum chloride aqueous solution, a 16.4% sodium carbonate aqueous solution (0.21 mole ratio to 1 mole of lanthanum oxide) was added dropwise at 25 ℃ over 40 minutes to adjust the pH to 2.5, and seed crystals of hydrated lanthanum carbonate were seeded. Further, a 16.4% aqueous solution of sodium carbonate (0.0013 mol based on 1 mol of lanthanum oxide) was added dropwise and the mixture was kept for 30 minutes. Subsequently, a 16.4% aqueous solution of sodium carbonate (0.52 mole ratio based on 1 mole of lanthanum oxide) was added dropwise at 25 ℃ over 75 minutes to adjust the pH to 3.7. After keeping the temperature at 25 ℃ for 45 minutes, the resulting crystals were filtered and washed with water (1 part by weight). The filtrate and the washing solution were combined, heated to 50 ℃ and 35% hydrochloric acid (0.52 mole ratio to 1 mole of lanthanum oxide) was added. A16.4% aqueous solution of sodium carbonate (0.31 mole ratio to 1 mole of lanthanum oxide) was added dropwise at 50 ℃ over 45 minutes, and seed crystals of hydrated lanthanum carbonate were seeded at pH 2.5. A16.4% aqueous solution of sodium carbonate (0.038 mol based on 1 mol of lanthanum oxide) was added dropwise thereto, and the mixture was incubated at 50 ℃ for 40 minutes. Then, a 16.4% sodium carbonate aqueous solution was added dropwise at 50 to 51 ℃ over 4 hours and 10 minutes to adjust the pH to 6.0. Keeping the temperature at 50 ℃ for 20 minutes, and cooling to 30-35 ℃. And (3) keeping the temperature at 30-35 ℃ for 13 hours, and filtering precipitated crystals. The obtained crystals were washed with water (24 parts by weight), and then dried at 40 ℃ (bath temperature) and then at 90 ℃ under reduced pressure to obtain lanthanum carbonate hydrate in a yield of 80%. The amount of impurity elements in the obtained crystal was determined by inductively coupled plasma mass spectrometry.

Reference example

To lanthanum oxide (1 part by weight) was added water (3 parts by weight), heated to 40 ℃, and 35% hydrochloric acid (6.3 mol ratio to 1 mol of lanthanum oxide) was added dropwise to obtain an aqueous lanthanum chloride solution. During this period, the liquid temperature is 39-52 ℃. To the obtained lanthanum chloride aqueous solution was added 35% hydrochloric acid (0.52 mole ratio with respect to 1 mole of lanthanum oxide). Subsequently, a 16.4% aqueous solution of sodium carbonate (0.47 mole ratio based on 1 mole of lanthanum oxide) was added dropwise at 25 ℃ over 40 minutes. At pH 2.8, seeds of hydrated lanthanum carbonate were seeded. A16.4% aqueous solution of sodium carbonate (0.0013 mol based on 1 mol of lanthanum oxide) was added dropwise thereto, and the mixture was incubated at 25 ℃ for 30 minutes. At 25 ℃, a 16.4% aqueous solution of sodium carbonate (0.074 mole ratio to 1 mole of lanthanum oxide) was added dropwise over 10 minutes. After the temperature is kept at 25 ℃ for 30 minutes, the temperature is raised to 50 ℃, and 16.4 percent sodium carbonate aqueous solution is dripped into the mixture for 4 hours and 40 minutes at 49-50 ℃ to ensure that the pH value is 5.7. Keeping the temperature at 50 ℃ for 15 minutes, and cooling to 30-35 ℃. Keeping the temperature at 30-35 ℃ for 17 hours, and filtering precipitated crystals. The obtained crystals were washed with water (24 parts by weight), and then dried at 40 ℃ (bath temperature) and then at 90 ℃ under reduced pressure to obtain lanthanum carbonate hydrate in a yield of 97%. The amount of impurity elements in the obtained crystal was determined by inductively coupled plasma mass spectrometry.

Table 1 shows the contents (ppm) of lead (Pb), arsenic (As) and vanadium (V) in the hydrated lanthanum carbonate and the raw material lanthanum oxide obtained in each example and reference example.

TABLE 1

	Lanthanum oxide	Example 1	Example 2	Example 3	Reference example
						Pb	1.0	0.38	0.15	0.11	0.55
As	1.7	0.67	-	0.3	0.83
						V	11.1	4.4	-	2.5	6.3

Example 4

To lanthanum oxide (1 part by weight) was added water (3 parts by weight), heated to 40 ℃, and 35% hydrochloric acid (6.3 mol ratio to 1 mol of lanthanum oxide) was added dropwise to obtain an aqueous lanthanum chloride solution. During this period, the temperature of the liquid is 40-50 ℃. To the resulting lanthanum chloride aqueous solution, a 15.1% ammonium carbonate aqueous solution (in a proportion of 0.22 mol relative to 1 mol of lanthanum oxide) was added dropwise at 25 ℃ over 30 minutes. Seeds of hydrated lanthanum carbonate were seeded at pH 3.7 and incubated for 30 minutes. A15.1% ammonium carbonate aqueous solution (0.52 mole ratio based on 1 mole of lanthanum oxide) was added dropwise over 55 minutes to adjust the pH to 3.6. After incubation at 25 ℃ for 40 minutes, the resulting crystals were filtered and washed with water (1 part by weight). The filtrate and the washing liquid are combined, the temperature is raised to 30 ℃, and seed crystals of hydrated lanthanum carbonate are inoculated. A15.1% ammonium carbonate aqueous solution was added dropwise over 4 hours and 30 minutes to adjust the pH to 6.0. After incubation at 30 ℃ for 1 hour 10 minutes, the precipitated crystals were filtered. The obtained crystals were washed with water (24 parts by weight), and then dried at 40 ℃ (bath temperature) under reduced pressure to obtain lanthanum carbonate hydrate in a yield of 81%. The amount of impurity elements in the obtained crystal was determined by inductively coupled plasma mass spectrometry.

TABLE 2

	Lanthanum oxide	Example 4
			Pb	1.0	<0.1
As	0.5	0.05
			V	0.2	<0.1

Example 5

To lanthanum oxide (1 part by weight) was added water (4 parts by weight), heated to 40 ℃ and 70% nitric acid (6.3 mol ratio to 1 mol of lanthanum oxide) was added dropwise to obtain a lanthanum nitrate aqueous solution. During this period, the liquid temperature is 40-67 ℃. To the obtained lanthanum nitrate aqueous solution, a 15.1% ammonium carbonate aqueous solution (in a proportion of 0.22 mol relative to 1 mol of lanthanum oxide) was added dropwise at 25 ℃ over 30 minutes. At pH 3.6, seed crystals of hydrated lanthanum carbonate were seeded and incubated for 30 minutes. A15.1% ammonium carbonate aqueous solution (0.52 mole ratio to 1 mole of lanthanum oxide) was added dropwise over 25 minutes to adjust the pH to 3.5. After 30 minutes of incubation at 25 ℃, the resulting crystals were filtered and washed with water (1 part by weight). The filtrate and washings were combined and seeded with lanthanum carbonate hydrate seeds at 27 ℃. A15.1% ammonium carbonate aqueous solution was added dropwise over 3 hours and 45 minutes to adjust the pH to 6.0. After 16 hours and 40 minutes at 30 ℃ the precipitated crystals were filtered. The obtained crystals were washed with water (24 parts by weight), and then dried at 40 ℃ (bath temperature) under reduced pressure to obtain lanthanum carbonate hydrate in a yield of 80%. The amount of impurity elements in the obtained crystal was determined by inductively coupled plasma mass spectrometry.

TABLE 3

	Lanthanum oxide	Example 5
			Pb	1.0	0.02
As	0.5	0.20
			V	0.2	0.03

Industrial applicability

According to the method of the present invention, lanthanum carbonate hydrate which is useful as a therapeutic agent for hyperphosphatemia of patients with chronic renal insufficiency can be produced at a high purity with a small amount of impurity elements.