CN1436182A - 环氧丙烷的精制方法 - Google Patents

环氧丙烷的精制方法 Download PDF

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CN1436182A
CN1436182A CN01808670A CN01808670A CN1436182A CN 1436182 A CN1436182 A CN 1436182A CN 01808670 A CN01808670 A CN 01808670A CN 01808670 A CN01808670 A CN 01808670A CN 1436182 A CN1436182 A CN 1436182A
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propylene oxide
hydrocarbon
impurity
purification
tower
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CN1173962C (zh
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奥宪章
石野胜
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Sumitomo Chemical Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D301/00—Preparation of oxiranes
    • C07D301/32—Separation; Purification

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  • Organic Chemistry (AREA)
  • Epoxy Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

环氧丙烷的精制方法，其特征在于在C5以下的烃的存在下将含有杂质的环氧丙烷进行蒸馏。按照本发明，提供一种环氧丙烷精制方法，它有能高效率地除去要精制的含有环氧丙烷的溶液中存在的杂质、尤其能极高效率地除去含氧杂质这样的特长。

Description

环氧丙烷的精制方法
技术领域
本发明涉及环氧丙烷的精制方法。更详细地说，本发明涉及环氧丙烷的精制方法，即一种高效率除去要精制的环氧丙烷中存在的杂质的方法，尤其具有能极高效率地除去含有氧原子的杂质(以下称“含氧杂质”)这样的特长。
背景技术
作为环氧丙烷的精制方法，已知有使用水和C8～C10的烃作为萃取剂，使环氧丙烷中所含的C6烃类杂质转移到油层中，然后蒸馏水层的环氧丙烷水溶液的方法(特开平5-170755号公报)。此外，还已知有以C2～C6亚烷基二醇作为萃取剂蒸馏的方法(美国专利第5354431号)。然而，从高效率且经济地除去含氧杂质这样的观点来看，这些方法都不能令人满意。
发明内容
鉴于这样的现状，本发明的目的是提供一种环氧丙烷精制方法，其特长在于能高效率地除去要精制的环氧丙烷中存在的杂质、尤其能极高效率地除去含氧杂质。
即，本发明涉及一种环氧丙烷精制方法，其特征在于在C5以下的烃的存在下将含有杂质的环氧丙烷进行蒸馏。
附图简单说明
图1是本发明的较好实施形态实例的显示图。
图1中，1是蒸馏塔，2是低纯度环氧丙烷的供给管，3是烃的供给管，4是杂质的管道，和5是精制环氧丙烷的管道。
实施发明的最佳形态
本发明中供精制的含杂质的环氧丙烷没有特别限制，例如，通过丙烯的环氧化或直接氧化而得到的粗制环氧丙烷就可以适用于本发明。
供精制的环氧丙烷中通常含有各种杂质，但这些当中有甲醇、水、乙醛、丙醛等含有氧原子的杂质(含氧杂质)。本发明方法对于含有这些含氧杂质的环氧丙烷、特别是含有极难以与环氧丙烷分离的甲醇、水的环氧丙烷是有效的。供给本发明精制方法的环氧丙烷中该含氧杂质的浓度通常是合计50重量ppm～5重量％左右。
作为本发明中可以使用的C5以下的烃，可以列举甲烷、乙烷、乙烯、丙烷、丙烯、正丁烷、异丁烯、正戊烷、1-丁烯、2-丁烯、异丁烷、环戊二烯、环戊烯、异戊二烯、环戊烷、1-戊烯、2-戊烯、丁二烯等，较好的是C3～C5的烃，更好的是C4或C5的烃。这些烃可以一种单独使用，也可以2种以上并用。该烃的存在量，在塔内进料段的上部，较好的是20～99.99重量％，更好的是30～99.9重量％。若该存在量过少，则杂质与该烃不能充分接触，有时含氧杂质会变得不能充分分离，另一方面，若该存在量过多，则会从塔底部馏出，有时会成为环氧丙烷的杂质。要说明的是，从塔内流出的烃通过再循环到回收塔内就可以经济地使用。在并用2种以上的烃时的存在量是以总烃的合计量为基准的。
为了使烃能够存在，只要使从塔内流出的烃量等于向塔内进料的烃量即可。为了使该烃能在塔内积累并减少来自系统外的补充量，使塔顶的气体冷凝之后与水接触静置，只让水相与含氧杂质一起清除到系统外，让油层全部返回塔内，使补充烃量只等于溶解到水相中的量，就可以高效率、经济地运转。
以下参照图1说明本发明中蒸馏的较好形态。按照这种形态，以含有甲醇、水、乙醛等超过约50重量ppm的含氧杂质的低纯度环氧丙烷作为供给原料由供给导管连续供给塔1。同时，像异丁烯这样的C4烃也由供给管3连续进料，在塔内接触，甲醇或水等含氧杂质连同该烃一起由供给导管4从塔顶蒸出。除去了杂质的环氧丙烷从蒸馏塔的底部由供给导管5回收。
实施例
实施例1
把含有水0.2重量％、乙醛0.02重量％、甲醇0.02重量％的环氧丙烷进料到塔板数60的蒸馏塔中。此外，丁烷也同时从环氧丙烷的进料段下部进料。乙醛、甲醇、水、丁烷从蒸馏塔塔顶部蒸出，从塔底抽出的环氧丙烷中的杂质，按照模拟，达到了乙醛10重量ppm、甲醇5重量ppm、水10重量ppm、丁烷10重量ppm，都令人满意地降低了。要说明的是，蒸馏塔的塔顶压力是0.7MPa、温度是63℃、操作回流量是回流量与环氧丙烷供给流量之比为3。
产业上利用的可能性
如以上所说明的，按照本发明，可以提供一种环氧丙烷精制方法，其特长在于能高效率地除去要精制的环氧丙烷中存在的杂质、特别是能极高效率地除去含氧杂质。

Claims (3)

1.环氧丙烷精制方法，其特征在于在C5以下的烃的存在下将含有杂质的环氧丙烷进行蒸馏。
2.权利要求1记载的方法，其中，该烃选自C3～C5的烃组成的一组。
3.权利要求1记载的方法，其中，该烃选自C4和C5的烃组成的一组。
CNB018086705A 2000-04-28 2001-04-20 环氧丙烷的精制方法 Expired - Fee Related CN1173962C (zh)

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CA2407234A1 (en) 2001-11-08
EP1288209A4 (en) 2003-07-02
EP1288209A1 (en) 2003-03-05
JP2001302649A (ja) 2001-10-31
KR20030068032A (ko) 2003-08-19
US20030102206A1 (en) 2003-06-05
WO2001083468A1 (fr) 2001-11-08
CN1173962C (zh) 2004-11-03
US6736941B2 (en) 2004-05-18
AU4882301A (en) 2001-11-12
BR0110227A (pt) 2003-01-21

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