Method for cyclically producing taurine at high yield

Abstract

The invention relates to a method for cyclically producing taurine at a high yield. The method includes the following steps that S1, ethylene oxide reacts with a sodium hydrogen sulfite solution to generate sodium hydroxyethyl sulfonate; S2, sodium hydroxyethyl sulfonate obtained in S1 is subjected to an ammonolysis reaction in ammonium hydroxide, flashing is carried out after the reaction is completed, and ammonia gas is recycled; S3, taurine-containing feed liquid of reaction liquid obtained after flashing in S2 is collected through an acid cation exchange resin column, the resin column is regenerated with a sulfur dioxide or carbon dioxide water solution after being inactivated, and eluant obtained during regeneration can be directly reused or reused after being treated with sulfur dioxide; S4, the feed liquid collected in S3 is subjected to after-treatment, and taurine is obtained. The method has the advantages that the generation amount of waste liquid in the whole process is small, part of substances are effectively and cyclically utilized in the process, the cost is reduced, the yield of taurine can reach 90% or above, meanwhile, the production process is relatively simple, and large-scale production is easy.

Description

Technical field [0001] The invention belongs to the field of preparation of taurine, and specifically relates to a method for producing taurine in a high-yield cycle. Background technique [0002] Taurine is a kind of non-protein amino acid. As a medicine, it has anti-inflammatory, antipyretic, analgesic, anticonvulsant and lowering blood pressure effects. It has a good effect on infant brain development, nerve conduction, visual function improvement and calcium absorption. . Taurine has a series of unique functions on the cardiovascular system, which can enhance physical fitness and relieve fatigue. Therefore, taurine has gradually been widely used in medical, food and health care fields. [0003] At present, more than 50,000 tons of taurine are produced annually from two petroleum-derived compounds, ethylene oxide and monoethanolamine. At present, most of taurine is prepared from ethylene oxide in three steps: (1) the addition reaction of ethylene oxide and sodium bisulfite to ...

AI Technical Summary

Problems solved by technology

Sulfuric acid and alkali will eventually be converted into sodium sulfate. With long-term accumulation, sodium sulfate will take away part of the taurine, resulting in material loss; at the same time, sodium sulfate will always exist in the mother liquor, so that when the crude taurine is centrifuged, the crude product Residual sulfate in the medium will easily cause the product sulfate to exceed the standard, and the sulfate in the mother liquor will easily block the cooler, heater, synthesis tower and high-pressure pipeline under the synthesis conditions of high temperature and high pressure, resulting in the failure of normal production ; At the same time, a large amount of sulfate solid waste increases labor intensity and is not easy to handle

② Due to the presence of sodium sulfate after neutralization, the extraction rate at one time is limited, so in the subsequent extraction process, taurine (H 2 NCH 2 CH 2 SO 3 H) After multiple extractions, a large amount of waste mother liquor will be produced, which not only causes waste of raw materials, low yield, but also pollutes the environment. At the same time, the concentration of mother liquor needs to consume a large amount of steam, which makes the energy consumption higher

However, the discarded mother liquor still contains taurine, ammonium sulfate and other organic impurities

[0008] To sum up, although the current taurine preparation process is relatively mature, there are still many deficiencies in the separation and purification of taurine and the recycling or resource treatment of intermediate by-products. It is urgent to find an effective method to overcome the above deficiencies

Images