THR production method? Electrodialysis + nanofiltration membrane technology can be used

Membrane separation technology is the use of membrane for the selection of various components in the mixture through the performance to the product of the separation, purification and concentration of new separation technology, membrane separation process is a kind of no phase change, lower energy consumption physical separation process, with high efficiency, energy saving, no pollution, easy operation, wide application characteristics and foreign called the 21st century the most promising one of the top ten new and high technology.

threonine is a kind of essential amino acids, mainly used in pharmaceutical, chemical reagents, food fortifier, feed additive, etc. Threonine a mother liquor production process of centrifugal separation, high content of inorganic salt, salt by using ion exchange resin in addition to the original process, from the liquid by activated carbon decoloring, removing part of the protein, crude products. Traditional process needs to consume large amounts of acid and alkali, resin regeneration cycle is short, easy to loss, waste acid alkali emissions pollution of the environment, decoloring link activated carbon is used up big, virtually raised the enterprise production operation cost, environmental protection pressure.

in fujian threonine production process, adopts special 'nanofiltration membrane electrodialysis +' as a centrifugal mother liquor of desalination and decoloring purification process.

threonine centrifugal mother liquor after first 0 at a time. 5% activated carbon and microfiltration process, with a yield of 98% or more hollow microfiltration membrane system; After processing of centrifugal mother liquor adopts special electrodialysis removing most of the inorganic salt, initial conductivity, 100, 000 ~ 130, 000 mu s/cm to conductivity 14 ~ 16 000 000 mu s/cm, removal rate of 88%, threonine loss rate of 10% or less; Electrodialysis desalination liquid decolorization by nanofiltration system purification, nanofiltration membrane system including pretreatment and decoloring purification system two parts. Pre filtration system to remove electrodialysis desalination possible existence of solid particles in liquid, suspended solids and other mechanical impurities. Decolorizing purification system with high separation efficiency, about 700 ~ 800 intercept molecular weight of nanofiltration membrane separation material, driven by the pressure water and threonine through nanofiltration membrane to enter through the liquid side, into the next production working procedure, and intercept protein, most of the pigment and macromolecular organic matter, realize the desalted liquid in the purification, threonine yield ( Including intercept and through the clear liquid) ≥98%。

use a variety of membrane technology to deal with a centrifugal mother liquor threonine, simplify the production technology, improve product quality, in order to realize the economic benefit and environment benefit unifies.

the hydroxy phenyl glycine is a kind of pharmaceutical intermediates, the production process can produce high salt content. Processing technology of mother liquor was after ion exchange resin in addition to salt, again by active carbon decoloring, finally with the filtrate into normal refining process. Mother liquid to use after a certain number of times, impurity, affect the product quality, then you need to mother liquor. The disadvantages of previous process lies in the acid and alkali consumption of large, resin wastage is bigger, lead to the production cost is higher, at the same time because of the emissions of acid and alkali, make the heavier pollution to the environment.

by nearly a month of pilot, set up 60 m3 / d of hydroxy phenyl glycine centrifugal mother liquor special electrodialysis desalination system. Running the results are shown in table 1

in addition, the membrane technology is applied to the process for production of glutamine, arginine, etc, such as the membrane electrodialysis desalination technology Ghana membrane filter decoloring after purification, arginine mother liquor of pervious to light can reach 80% ~ 92. 7%; In glutamine slurry process, membrane electrodialysis desalination rate ( By conductivity meter) Up to 90%.