A method of purifying the condensate obtained in the evaporative crystallization step of the aqueous ammonium sulfate phase
A technology of water-containing ammonium sulfate and condensate, which is applied in chemical instruments and methods, preparation of lactams, separation/purification of lactams, etc., can solve problems such as increased water consumption, increased environmental load, and increased costs, and achieves reductions The effect of water consumption
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Embodiment 1
[0071] In this embodiment, the method is as figure 2 shown.
[0072] According to DSM In a commercial cyclohexanone oxime production plant where the technology works, hydrogen gas is used to reduce nitrate dissolved in an aqueous solution to hydroxylamine. The obtained hydroxylamine is reacted with cyclohexanone to produce cyclohexanone oxime. After purification of cyclohexanone oxime, the obtained cyclohexanone oxime was mixed with excess oleum to convert it into caprolactam (average production of 17 tons of caprolactam per hour). The obtained Beckmann rearrangement mixture [1] and aqueous ammonia [4] are added to the neutralization zone [A]. The temperature of the neutralization zone [A] was kept at 50°C. In the neutralization zone [A] a neutralized mixture comprising aqueous ammonium sulphate and aqueous crude caprolactam is obtained. The pH of the neutralized mixture was 4.5.
[0073] The neutralized mixture [5] is fed to the separator [B] in which the aqueous ammon...
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