The invention discloses a method for producing
taurine by using an improved
ethylene oxide method, and belongs to the technical field of
fine chemical synthesis. According to the method, in a sulfonation
reaction step,
ethylene oxide and
sulfite are subjected to a reaction in the presence of a
phase transfer catalyst and a free radical inhibitor, and preferably,
copper sulfate and / or an additive with dual functions of free radical inhibition and ammonolysis
catalysis are / is adopted. Then, directly carrying out ammonolysis reaction on the obtained isethionate solution and
ammonia water in the presence of the additive (as a Lewis acid catalyst), and finally, acidifying, carrying out membrane
filtration, crystallizing and
drying to obtain a high-purity
taurine product. Through the innovative design of'one agent with double effects', the
side reaction in the sulfonation stage is effectively inhibited, the ammonolysis reaction efficiency is remarkably improved, the whole process is carried out under the milder condition, the total yield of the final
taurine product is high (can reach 87% or above), the purity is stabilized at 99.5% or above, the emission of three wastes is less, and the industrial application value is remarkable.