Title:
【発明の名称】高純度パラヨ-ドフルオロベンゼンの製造方法
Document Type and Number:
Japanese Patent JPH07567
Kind Code:
B2
Abstract:
PURPOSE:To obtain the titled compound in high purity, yield and selectivity, by separating the titled compound having high purity from a reaction mixture obtained by the iodination of fluorobenzene and hydrocracking the residue to recover the raw material and iodine component in high efficiency. CONSTITUTION:An iodinated fluorobenzene mixture containing p- iodofluorobenzene as a main component (>=80mol%) is produced by reacting fluorobenzene with iodine and/or hydrogen iodine in the presence of an oxidizing agent (preferably nitric acid or nitrogen oxide having oxidizing power) at 10-150 deg.C. The objective p-iodofluorobenzene having desired purity is separated from the mixture by distillation and/or crystallization. The separation residue is made to react with hydrogen in the presence of a hydrocracking catalyst (preferably Pd and/or Ni catalyst) and a base at 10-200 deg.C and decomposed into fluorobenzene and hydroiodide of said base. Both products are recovered and recycled to iodination step.
Inventors:
Nobuten Fukuoka
Masahiro Tojo
Masahiro Tojo
Application Number:
JP15614786A
Publication Date:
January 11, 1995
Filing Date:
July 04, 1986
Export Citation:
Assignee:
Asahi Chemical Industry Co., Ltd.
International Classes:
B01J23/56; B01J23/63; B01J23/74; B01J23/755; B01J23/89; B01J25/02; C07B61/00; B01J23/44; C07C17/00; C07C17/10; C07C17/12; C07C17/38; C07C25/13; (IPC1-7): C07C25/13; B01J23/44; B01J25/02; C07C17/00; C07C17/12; C07C17/38
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