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Tetracycline recovery process

阅读:315发布:2022-08-17

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1. THE PROCESS WHICH COMPRISES DISSOLVING TETRACYCLINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF TETRACYCLINE AND TETRACYCLINE ORGANIC-BASE SALT OF A BASE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY ALKYLAMINES CONTAINING FROM 6 TO 18 CARBON ATOMS AND QUATERNARY TRIMETHYL AMMONIUM COMPOUNDS CONTAINING ONE ALKYL GROUP OF 8 TO 18 CARBON ATOMS AND UREA IN AQUEOUS METHANOL TO OBTAIN A SOLUTION OF A PH OF FROM ABOUT 1 TO ABOUT 1.8 AT A TEMPERATURE BELOW ABOUT 27*C. HAVING AT LEAST ABOUT 30,000 UNITS OF TETRACYCLINE ACTIVITY PER MILLILITER, FROM ABOUT 50 TO ABOUT 75 EQUIVALENTS OF UREA PER EQUIVALENT OF TETRACYCLINE AND FROM ABOUT 10 TO ABOUT 35% BY VOLUME OF METHANOL, ADJUSTING THE PH OF SAID SOLUTION TO FROM ABOUT 4.0 TO ABOUT 5.0 WHEREUPON A TETRACYCLINE UREA COMPOUND PRECIPITATES AND SEPARATING PRECIPITATED TETRACYCLINE-UREA COMPOUND FROM SAID AQUEOUS METHANOL SOLUTION.
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