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    Recovery and purificn of (meth)acrylonitrile - with recycle of aq. quench stream in ammoxidn process
    23.
    发明专利
    Recovery and purificn of (meth)acrylonitrile - with recycle of aq. quench stream in ammoxidn process 未知

    公开(公告)号：FR2307798A1

    公开(公告)日：1976-11-12

    申请号：FR7511799

    申请日：1975-04-16

    Applicant: STANDARD OIL CO

    Inventor： WU HSIN CHIH

    IPC: C07C121/32 ,  C07C120/00

    Abstract: In the recovery and purificn. of (meth)acrylonitrile obtd. by ammoxidn. of propylene (isobutylene) by (a) quenching the reactor effluent gases with an aq. stream, (b) recovering HCN and (meth)acrylonitrile as an aq. soln., (c) concentrating the soln. from (b) by distilling water/impurities, (d) distilling the concentrate to remove HCN as overheads, and (e) removing the bottoms or a side-stream, in the HCN distn., to a decanter to form an aq. and org. layer (of (meth)acrylonitrile), the improvement is that the aq. layer is removed from the decanter at (e) and directly contacted with the reactor effluent in the quench column at (a). The amt. of acid needed, to neutralise excess ammonia breaking through in the reactor effluent, is reduced; the aq. stream is utilised, thus reducing disposal problems.

    (Meth)acrylonitrile recovery and purificn from ammoxidn effluent - with recycle of prod column bottoms to form quench liq in quench system
    30.
    发明专利
    (Meth)acrylonitrile recovery and purificn from ammoxidn effluent - with recycle of prod column bottoms to form quench liq in quench system 未知

    公开(公告)号：DE2552233A1

    公开(公告)日：1977-06-02

    申请号：DE2552233

    申请日：1975-11-21

    Applicant: STANDARD OIL CO OHIO

    Inventor： WU HSIN CHIH

    IPC: C07C121/32 ,  C07C120/14

    Abstract: In the recovery and purification of acrylonitrile produced by the reaction of propylene, O2 and NH3 in the presence of an ammoxidation catalyst, which consists of (a) contacting the ammoxidation reactor effluent with an aq. quench liquid in a quench system to produce a gaseous quench effluent having a temp. of 90-230 degrees F, (b) removing this effluent and absorbing it in water to form a soln., (c) distilling most of the by-products of the ammoxidation reaction and most of the water from the soln. to obtain a liquid stream contg. crude acrylonitrile, and (d) distilling the crude acrylonitrile to obtain a gaseous overhead stream of product quality acrylonitrile and a bottoms stream contg. acrylonitrile and impurities and having a pH of 3-5, the improvement comprises recycling part of the liq. bottoms stream obtd. in step(d) as at least part of the quench liquid in step (a). This improvement may also be applied to the recovery and purification of methacylonitrile by ammoxidation of isobutylene. There is no need for the fractional distillation column of prior art. and the efficiency of the recovery and purification system is improved.

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