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Catalyzed hydrogenation de-chlorine method of chlorinated aromatic hydrocarbons

A technology for catalytic hydrogenation and chlorinated aromatics, applied in chemical instruments and methods, physical/chemical process catalysts, bulk chemical production, etc., can solve problems such as deactivation, achieve good stability, good application prospects, and reactivity high effect

Inactive Publication Date: 2007-09-19
TIANJIN UNIV
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AI Technical Summary

Problems solved by technology

[0004] At present, the hydrodechlorination process reported in the literature mainly uses monometallic or bimetallic catalysts containing nickel or noble metals, and the hydrodechlorination activity of noble metal catalysts is better than that of nickel-based catalysts. The problem of deactivation caused by sintering and other reasons, especially in the process of gas phase hydrodechlorination reaction is more significant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1. A certain amount of SiO 2 Dry at 110°C for 4 hours, use Ni(NO 3 ) 2 , NH 4 h 2 PO 4 and nitric acid solution (the molar ratio of nickel and phosphorus in the solution is 3:1) to impregnate SiO 2 The carrier was dried for 6 hours at 110° C. for 4 hours, and then calcined at 500° C. for 2 hours in an air atmosphere to prepare a catalyst precursor. Put 1.0 mL of this precursor in a quartz tube reactor, feed hydrogen gas at a flow rate of 250 mL / min, first raise the temperature from room temperature to 250 °C at a rate of 5 °C / min, and then raise the temperature to 650 °C at a rate of 1 °C / min. °C, and maintained at 650 °C for 4 hours, the supported nickel phosphide catalyst was prepared, and the mass content of nickel in the catalyst was 15%. The XRD test results show that the silica-supported nickel phosphide phase is Ni 3 p.

[0011] The performance evaluation process of gas-phase hydrodechlorination reaction of chlorobenzene over supported nickel p...

Embodiment 2

[0012] Example 2. Catalyst preparation process and reaction performance evaluation conditions are the same as in Example 1, except that the molar ratio of nickel and phosphorus in the impregnating solution is 2:1. The XRD test results show that the silica-supported nickel phosphide phase is Ni 12 P 5 . The performance of the hydrodechlorination reaction of chlorobenzene on the catalyst is shown in Table 1.

Embodiment 3

[0013] Example 3. Catalyst preparation process and reaction performance evaluation conditions are the same as in Example 1, except that the molar ratio of nickel and phosphorus in the impregnation solution is 1:1. The XRD test results show that the silica-supported nickel phosphide phase is Ni 2 p. The performance of the hydrodechlorination reaction of chlorobenzene on the catalyst is shown in Table 1.

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Abstract

The invention relates to a method for chloro arene catalyzing hydrogenation and dechlorination. The processing is as follows: filling load nickel phosphide catalyst in the fixing bed reactor; airing the hydrogen gas into the reactor with an airspeed of 10-10000 h-1 and airing chlorobenzene, dichlorobenzene or trichlorobenzene with an airspeed of 0.01-10 h-1 at normal atmosphere and in 200-400 DEG C for catalyzing hydrogenation and dechlorination. Said load nickel phosphide catalyst has silicon dioxide, alumina, HY molecule screen, zirconia, titanic anhydride or active carbon as carrier. The active component nickel exists in a phase of Ni2P, Ni12P5 or Ni2P. The nickel mass content in the catalyst is 5-25%. The advantages of the invention are that the catalyst has a good reacting activity and stability of hydrogenation and dechlorination and it achieves continuous application.

Description

technical field [0001] The invention relates to a method for hydrodechlorination of chlorinated aromatic compounds, in particular to a method for carrying out hydrodechlorination of chlorinated aromatic compounds by using a loaded nickel phosphide catalyst. Background technique [0002] Chlorinated organic compounds are important chemical raw materials, organic synthesis intermediates and organic solvents, and are widely used in chemical, pharmaceutical, pesticide, dye, electronics and other industries. However, the widespread use of chlorinated organic compounds also poses a growing threat to human health and the environment. For example, under the irradiation of ultraviolet rays, the inorganic chlorine produced by the decomposition of Freon leads to the destruction of the ozone layer. Many organochlorine pesticides (lindane, aldrin, dieldrin, etc.) The application, existence and enrichment in the food chain are more harmful to the human body; the dioxins (PCDD / Fs) releas...

Claims

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Application Information

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IPC IPC(8): C07C1/30B01J27/185C07C15/04
CPCY02P20/52
Inventor 陈吉祥刘旭光周少君张继炎
Owner TIANJIN UNIV
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