Proses baru dehidrasi Molekular Ssarana Daur Ulang alkohol Dalam Produksi Baterai

1\Technology Introduction
A lot of waste alcohol is produced in lithium battery production in our country. Because the waste alcohol contains water and dust and high acidity, it causes difficulties in waste alcohol recycling. Membrane filtration is the traditional method for dehydrate and dedusting, but it is costly. Besides, the service life of membrane is short and the membrane can not be recycled completely. Our company developed a more economic and effective method, that is the molecular sieve dehydration, which changes the water content from 99.4% to 99.8% or above to meet the requirement of anhydrous alcohol in battery production. The process includes three parts: Neutralization of the original alcohol, molecular sieve dehydration and thin alcohol recycling. The waste alcohol will be pretreated in neutralization system to reach the predetermined pH value, then goes to the molecular sieve dehydration system: Vaporization before adsorption dewatering in molecular sieve which produces anhydrous alcohol 99.8%(V/V) and above. Absorption dewatering and desorbing will be finished in two molecular sieves at the same time. The desorbing thin alcohol will be condensed back into crude alcohol system. The dust in crude alcohol will be removed in evaporation and finally goes into the waste water, which can be reused. There is very little waste water came with the raw material in the process. Moreover, the treatment cost is low and the steam consuming is lower than 1T/T.

2\Technology Route
There are several sets of devices in the waste alcohol recycling in battery production. They are neutralization devices, including neutralization tank, neutralization pump and stirrer; Dehydration devices, including preheater, evaporimeter, superheater, molecular sieve, condenser and finished product tank; Thin alcohol recycling devices, including thin alcohol tank, concentrating tower, reboiler and condenser. The neutralization devices convert the acidity of the raw material to the degree that accepted by the molecular sieve, and the dehydration devices can remove the very little water in crude alcohol and desorb it to thin alcohol. After concentration, the thin alcohol is recycled as crude alcohol and redehydrated, and the waste water and dust from the concentrating tower can be reused in battery production.

3\Conclusion
The waste alcohol after molecular sieve dehydration in battery production can meet the recycle standard, and the alcohol content rising from 99.4% to 99.8% is practical. With the total vapor consuming less than 0.5 T/T finished alcohol, primary water consuming less than or equal to 3 T/T finished alcohol, the new process saves investment, extends the serving life of the devices, recycles the wastes, and produces no three wastes, thus the new process is an environment friendly production line.

4\Project application
Hangzhou sai nuo suo ou battery Co., Ltd.