Desalinisation process for salt-containing water solution of levocarnitine

Abstract

A method for desalting a salt-containing L-carnitine solution comprises the following steps: selecting the salt-containing L-carnitine solution with a weight concentration of 6.1% 2000 Kg, adjusting the pH value to 5 to 10, separating impurities, pre-desalting by an electrodialysis method to achieve the desalination rate of 60 to 90%, separating inorganic ammonium salt to obtain the pre-desalted salt-containing L-carnitine solution, desalting the pre-desalted salt-containing L-carnitine solution by resin exchange method to obtain a salt-containing L-carnitine solution, evaporating, concentrating, removing ammonia, and crystallizing to obtain 113 Kg L-carnitine product with a content of 99.74%, wherein the yield of L-carnitine is 92.6%. By adopting electrodialysis and resin exchange for desalting the salt-containing L-carnitine solution, the method can greatly reduce the use amount of resin and achieve less equipment investment, lower consumption of auxiliary materials, lower energy consumption, less amount of wastewater, higher yield, higher quality of the L-carnitine product, and greatly reduced desalination cost of the salt-containing L-carnitine solution. Additionally, useful inorganic ammonium byproducts can be obtained.

Description

technical field [0001] The invention relates to a desalination method of a saline-containing levocarnitine aqueous solution, in particular to an electrodialysis step in the desalination method of a saline-containing levocarnitine aqueous solution. Background technique [0002] Levocarnitine (L-Carnitine), also known as L-carnitine, is a vitamin B compound that is soluble in water. Levocarnitine is an important nutritional and food supplement for both medicine and food. It is the most basic factor in the utilization of fatty acids and energy metabolism. It has a good effect on improving human body functions. Levocarnitine cannot be synthesized in the human body. Can only rely on outsiders. As a conditional basic nutrient, L-carnitine is an important additive in health food and nutritional food for infants and young children. Levocarnitine can be produced by fermentation and chemical synthesis. Production of levocarnitine by fermentation requires high technical requirements...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the high content of inorganic ammonium salts in the saline-containing levocarnitine aqueous solution, when desalting by resin exchange method, the amount of resin is large, the resin column is large, and the investment in equipment is large;

[0004] 2. During elution, the amount of auxiliary raw materials ammonia and deionized water is large, and the consumption of auxiliary raw materials is high;

[0005] 3. After elution, the levocarnitine concentration of the eluent is low, and the energy consumption is high when evaporating the eluent;

[0006] 4. Because the amount of resin is large, when the resin is regenerated, it consumes a lot of acid and produces a large amount of waste water