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一种腈纶生产中硫氰酸钠水溶液的净化回收方法

2019-10-08 11:55:18 admin 192
一种腈纶生产中硫氰酸钠水溶液的净化回收方法,涉及一种污水处理方法,特别是在腈纶生产过程中净化回收硫氰酸钠水溶液的方法。包括缓冲储存、过滤、一级纳滤、二级纳滤、蒸发浓缩过程。采用本发明净化回收后,废弃液中硫氰酸钠的质量占原进料溶液中硫氰酸钠的总质量不超过5%,回收硫氰酸钠可达到98%以上,生产过程不需要添加烧碱、硫酸、硅藻土等化学原料,比通常的传统净化回收方法减少一次蒸发浓缩过程,脱盐水用量减少80%以上,蒸发浓缩水量也大大减少,污水排放量也大大减少。
权利要求(10)
  1. 一种腈纶生产中硫氰酸钠水溶液的净化回收方法,包括以下步骤:a、缓冲储存:收集待回收的硫氰酸钠溶液,撇除溶液中液面油类物质;b、过滤:去除进料溶液中的不溶性杂质;c、一级纳滤:将经过步骤b的过滤液批次进行一级纳滤循环处理,透过液进入溶液蒸发浓缩;d、蒸发浓缩:将一级纳滤过程产生的透过液经多效真空蒸发浓缩后,回收蒸发液即为腈纶生产环节使用的硫氰酸钠水溶液;其特征在于还包括二级纳滤,即,用脱盐水稀释步骤c处理后的剩余浓缩溶液,进入二级纳滤循环处理,将滤过液回收,进入缓冲储存;所述脱盐水的加入量与剩余浓缩溶液的体积比为1~3∶1。
  2. 2. 根据权利要求1所述腈纶生产中硫氰酸钠水溶液的净化回收方法,其特征在于经二 级纳滤循环处理未滤过的浓縮液经蒸发浓縮后焚烧。
  3. 3. 根据权利要求1所述腈纶生产中硫氰酸钠水溶液的净化回收方法,其特征在于进入 步骤a的硫氰酸钠重量百分比浓度不超过25% ,硫氰酸钠水溶液温度为20〜40°C 。
  4. 4. 根据权利要求3所述腈纶生产中硫氰酸钠水溶液的净化回收方法,其特征在于进入 步骤a的硫氰酸钠水溶液温度为25〜35°C 。
  5. 5. 根据权利要求1所述腈纶生产中硫氰酸钠水溶液的净化回收方法,其特征在于步骤 b的过滤精度为5〜200微米。
  6. 6. 根据权利要求5所述腈纶生产中硫氰酸钠水溶液的净化回收方法,其特征在于步骤 b的过滤精度为10〜50微米。
  7. 7. 根据权利要求1所述腈纶生产中硫氰酸钠水溶液的净化回收方法,其特征在于所述 的多效真空蒸发为3〜5效。
  8. 8. 根据权利要求1所述腈纶生产中硫氰酸钠水溶液的净化回收方法,其特征在于经步 骤c处理后剩余浓縮溶液体积占一级纳滤前体积的5〜30%。
  9. 9. 根据权利要求1所述腈纶生产中硫氰酸钠水溶液的净化回收方法,其特征在于经步 骤d处理后剩余的废弃溶液体积占二级纳滤处理前剩余浓縮溶液的体积百分比为20%〜 100%。
  10. 10. 根据权利要求9所述腈纶生产中硫氰酸钠水溶液的净化回收方法,其特征在于经 步骤d处理后剩余的废弃溶液体积占二级纳滤处理前剩余浓縮溶液的体积百分比为30〜 60%。
说明

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