Claims
- 1. A process for recovering aziridine-2-carboxylic acid salts, which comprises:
- (a) feeding an aqueous solution of an aziridine-2-carboxylic acid salt selected from the group consisting of a calcium salt and a barium salt containing at least an inorganic salt which is ionizable in said aqueous solution as an impurity into a front end of a bed of a cation exchanger selected from the group consisting of a strongly acidic cationic exchanger of a metal salt form wherein the metal is selected from the group consisting of calcium and barium, a weakly acidic cation exchanger of a metal salt form where the metal is selected from the group consisting of calcium and barium and a weakly acidic cation exchanger of H-form, and then
- (b) feeding water thereinto and recovering a fraction of the aziridine-2-carboxylic acid salt salt eluted at a rear end of the bed.
- 2. The process according to claim 1, wherein the aziridine-2-carboxylic acid salts have the formula (BI): ##STR4## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different and each represent a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms; M represents a cation selected from the group consisting of a calcium ion and a barium ion; and n re presents a valence of M.
- 3. The process according to claim 2, wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent a hydrogen atom.
- 4. The process according to claim 2, wherein M is ammonium, lithium, sodium, potassium, calcium and barium.
- 5. The process according to claim 4, wherein M is calcium or barium.
- 6. The process according to claim 1, wherein the aqueous solution of an aziridine-2-carboxylic acid salt containing at least an inorganic salt as an impurity is one obtained by reacting an .alpha.-halo-.beta.-aminopropionic acid compound of the formula (BII) or an .alpha.-amino-.beta.-halopropionic acid compound of the formula (BIII) with calcium hydroxide or barium hydroxide or one obtained by reacting an .alpha., .beta.-dihalopropionic acid compound of the formula (BIV) or an .alpha.-haloacrylic acid compound of the formula (BV) with ammonia in the presence of calcium hydroxide or barium hydroxide: ##STR5## wherein X represents a halogen atom selected from the group consisting of chlorine, bromine and iodine; Y represents a carboxyl group, carbamoyl group, alkoxycarbonyl group in which the alkoxy group has 1 to 8 carbon atoms or a cyano group; Z represents a carbamoyl group, alkoxycarbonyl group in which the alkoxy group has 1 to 8 carbon atoms or a cyano group; and R.sup.3 represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms.
- 7. The process according to claim 6, wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent a hydrogen atom.
- 8. The process according to claim 1, wherein the cation exchanger is a bead-shaped, strongly acidic cation exchange resin of a sodium, potassium or calcium form comprising a styrene resin comprising a copolymer of divinylbenzene and styrene as the base and having a divinylbenzene content of 1 to 20%, an average particle diameter of 100 to 500.mu., a sulfonic acid group as the ion exchange group and an exchange capacity of 0.5 to 5 meq/ml.
- 9. The process according to claim 1, wherrein the temperature of the liquid to be introduced into the bed comprising the cation exchanger is 5.degree. to 50.degree. C.
- 10. The process according to claim 6, wherein X is chlorine.
- 11. The process according to claim 1, wherein said water eluant is at a temperature of about 0.degree. to 70.degree. C.
- 12. The process according to claim 1, wherein said aqueous solution of the aziridine-2-carboxylic acid salt has a concentration of about 0.01 to 80%.
- 13. The process according to claim 1, wherein said aqueous solution of the aziridine-2-carboxylic acid is fed into the cation exchanger bed in the amount of 0.01 to 150% of the volume of the ion exchange bed.
- 14. The process according to claim 1, wherein the aqueous solution of the aziridine-2-carboxylic acid is fed into the cation exchanger with a liquid space velocity of 0.01 to 100 h.sup.-1.
- 15. The process according to claim 1, wherein the cation exchanger bed has a length of about 5 cm to 10 m.
Priority Claims (2)
Number |
Date |
Country |
Kind |
60-25775 |
Feb 1985 |
JPX |
|
60-159498 |
Jul 1985 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 06/858,549, filed on Feb. 12, 1986, now abandoned.
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4393000 |
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Entry |
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Continuations (1)
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Number |
Date |
Country |
Parent |
858549 |
Feb 1986 |
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