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Process for preparing aromatic iodine compounds

一种芳族化合物、化合物的技术，应用在制备碘化芳族化合物领域，能够解决无法充分提高反应物进料流量、二碘代化合物产率下降等问题，达到稳定控制、稳定反应温度、延长使用周期的效果

Inactive Publication Date: 2012-01-04
SK CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when it is difficult to control the reaction temperature, the feed flow rate of the reactant cannot be sufficiently increased, resulting in a decrease in the yield of the desired product diiodo compound

Method used

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  • Process for preparing aromatic iodine compounds
  • Process for preparing aromatic iodine compounds
  • Process for preparing aromatic iodine compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] use as figure 2 The equipment shown, with the same conditions of comparative example 1, add benzene (102.4g / hr), iodine (66.9g / hr) and one iodobenzene (483.8g / hr) in the presence of Na-13X zeolite catalyst to carry out iodine reaction. In addition, diiodobenzene (65.9 g / hr) was also added, based on the total feed material (Feed), wherein the composition of diiodobenzene was 9% (wt%). At this time, the molar ratio of non-halogenated aromatic compound / iodine added was 1.93. The diiodobenzene used in this paper is not a single material, but a liquid diiodobenzene obtained by crystallization and solid / liquid separation of the three isomers (para, ortho, meta) of diiodobenzene Mixture (para, ortho, meta).

[0073] also, Figure 4 Shown is a temperature profile according to the length of the reactor measured at the center of the reactor in the same manner as in Comparative Example 1. Table 1 shows the reaction conditions and the data of the reaction products.

[0074] In...

Embodiment 2

[0076] use as figure 2 The equipment shown, with the same conditions of comparative example 1, add benzene (98.1g / hr), iodine (47.8g / hr) and one iodobenzene (458.7g / hr) in the presence of Na-13X zeolite catalyst to carry out iodine reaction. In addition, diiodobenzene (115.1 g / hr) was added, based on the total feed material (Feed), wherein the composition of diiodobenzene was 16% (wt%). At this time, the molar ratio of non-halogenated aromatic compound / iodine added was 1.93.

[0077] also, Figure 4 Shown is a temperature profile according to the length of the reactor measured at the center of the reactor in the same manner as in Comparative Example 1. Table 1 shows the reaction conditions and the data of the reaction products.

[0078] In particular, all regions of the reactor are maintained at a nearly constant temperature. The temperature in the upper part of the reactor is maintained below about 300°C, which is close to the desired temperature. The reaction temperat...

Embodiment 3

[0080] use as figure 2 The equipment shown, with the same conditions of comparative example 1, add benzene (91.3g / hr), iodine (47.87g / hr) and one iodobenzene (422.7g / hr) in the presence of Na-13X zeolite catalyst to carry out iodine reaction. In addition, diiodobenzene (162.2 g / hr) was added, based on the total feed material (Feed), wherein the composition of diiodobenzene was 22% (wt%). At this time, the molar ratio of non-halogenated aromatic compound / iodine added was 1.93.

[0081] also, Figure 4 Shown is a temperature profile according to the length of the reactor measured at the center of the reactor in the same manner as in Comparative Example 1. Table 1 shows the reaction conditions and the data of the reaction products.

[0082] In particular, all regions of the reactor are maintained at a nearly constant temperature. The temperature in the upper part of the reactor is maintained below about 300°C, which is close to the desired temperature. The reaction tempera...

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Abstract

The present invention relates to a process for preparing iodinated aromatic compounds. Particularly, the present invention comprises the step of performing the iodination of a non-halogenated aromatic compound, a monoiodo aromatic compound, a diiodo aromatic compound, and iodine in the presence of a zeolite catalyst under oxygen atmosphere. In the process for preparing iodinated aromatic compounds according to the present invention, an iodination and an iodine conversion simultaneously occur, and then prevent side-reactions. Also, the lifetime of an iodination catalyst used therein can be extended by controlling the reaction temperature stably. Therefore, the process can be used for mass production of diiodo compound.

Description

technical field [0001] The present invention relates to a method for preparing iodinated aromatic compounds. In detail, it is a method of suppressing side reactions by simultaneous iodination reaction and iodine conversion reaction. During the process, the reaction temperature can be controlled, and the life of the iodination reaction catalyst can be prolonged, so that the formation of impurities can be stably maintained. Background technique [0002] The art of producing halogenated aromatic compounds by reaction of aromatic compounds such as benzene or naphthalene with halogens such as bromine, chlorine, iodine has been recognized in the art in various commercial fields. [0003] Generally, p-dichlorobenzene (p-di-chlorobenzene) produced by the reaction of benzene and chlorine is a raw material for preparing engineering plastic polyphenylene sulfide (plyphenylene sulfide, PPS). The technique for preparing PPS by polymerizing p-dichlorobenzene with sodium sulfide in N-meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07B39/00C07F13/00B01J29/00
CPCB01J29/06C07C17/156C07C25/02C07B39/00C07F13/00
Inventor 李仲基金汉锡林在凤车一勋
Owner SK CHEM CO LTD
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