Lysine has the functions of meeting animal needs, promoting animal growth, improving amino acid balance, increasing feed utilization, and saving protein resources. It can enhance the nutritional value of plant protein and its feed, which is beneficial for the development of protein feed resources. Adding restrictive amino acids to plants based feed can replace fish meal powder, thereby reducing feed costs and improving meat quality.

Process Flow Chart

Process Description

(1) The prepared fermentation raw material enters the production fermentors through the continuous sterilization system, including glucose syrup, nutrients, ammonium sulfate, etc. as carbon and nitrogen sources, by adjusting the pH, injecting sterilized air, introduce propagated strains, control temperature, and agitation speed, after around 40 hours of fermentation, the fermentation cycle will be completed with the lysine concentration about 220g/L.

(2) Add sulfuric acid into the fermentation broth to adjust the pH value to about 4.0, heat to about 70 ℃, and send it to the membrane system for filtration and the membrane permeate will go through continuous ion exchange to get high purity lysine extract.  While the (NH4)2SO4 in raffinate will be concentrated and crystallized as by products.

(3) The ion exchange extract is sent to the deamination tower for deamination, and to be concentrated to around 72% under condition of proper vacuum which is part of evaporator, and then sent to the neutralization step.

(4) The concentrated liquid is sent to the neutralization process, and is thoroughly mixed with hydrochloric acid through a mixer to adjust the required pH value to get L-lysine hydrochloride.

(5) The neutralized liquid is sent to an evaporation crystallizer for continuous crystallization. The crystallized slurry is separated by a centrifuge to obtain wet crystals and mother liquor. The wet crystals are dried in a drying process to obtain 98.5% L-Lysine chloride with minimum moisture.

(6) The mother liquor and well prepared auxiliary materials are mixed, and sent to the spray granulator, the moisture will be evaporated, and the granulated L-lysine sulfate is formed and will be cooled down, for package and storage.