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Method for regenerating urea dehydrogenation noble metal catalyst

A precious metal catalyst, dehydrogenation technology, applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc. consumption, no unsafe hazards, and the effect of saving regeneration costs

Active Publication Date: 2005-12-21
HAISO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the regeneration quality has not been effectively guaranteed, this kind of high-temperature regenerated urea dehydrogenation noble metal catalyst is no longer used

Method used

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  • Method for regenerating urea dehydrogenation noble metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Get 50ml of industrial deactivated TH-3 type urea dehydrogenation noble metal catalyst, soak with concentration 15wt% ammonium oxalate aqueous solution, solid-liquid volume ratio is 1: 3, soak for 4 hours, take out catalyst and wash with deionized water for 3 After the second time, it was dried at 120°C for 2 hours, and the activity of the regenerated catalyst was measured in the laboratory. The results are shown in Table 1.

Embodiment 2

[0018] Embodiment 2: get industrial inactivation TH-2 Type urea dehydrogenation noble metal catalyst 50ml, soaked in 3wt% ammonium tartrate aqueous solution, solid-liquid volume ratio is 1:5, soaked for 8 hours, took out the catalyst and washed it with distilled water for 3 times, then placed it in 120°C and dried it for 2 hours, the laboratory The activity of the catalyst after regeneration was measured, and the results are shown in Table 1.

Embodiment 3

[0019] Embodiment 3: Get 50ml of industrial deactivated TH-3 type urea dehydrogenation noble metal catalyst, soak with concentration 10wt% ammonium citrate aqueous solution, solid-liquid volume ratio is 1: 3, soak for 4 hours, take out catalyst and wash with deionized water After 3 times, it was dried at 120°C for 2 hours, and the activity of the regenerated catalyst was measured in the laboratory. The results are shown in Table 1.

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Abstract

This is the room temperature regeneration method of the catalyst for noble metal dehydrogenization by carbamide. Adopt 3 - 15wt% complex compound watery solution containing ammonium ion or ammonia, at 5 - 80 Deg. C, soak out the poison produced on the surface of deactivated heavy metal catalyst in carbamide dehydrogenization. The volume proportion of soaking solid and liquid is 1 : 2.5 - 5, soaking time is 4 - 8 hours, after get out the catalyst, wash over three times with distilled water or deionized water, then lay at 110 - 120 Deg. C to dry, so it can achieve the purpose of renewing activeness and reuse. Compared with the present high temperature hydrogen deoxidizing regeneration technology, the invention has following advantages: needn't hydrogen source; needn't operate at 500 - 600 Deg. C high temperature, and can be operated at room temperature of 5 - 80 Deg. C; can very remarkably save energy waste, needn't regeneration system and electric heating device; its operation is simple, has no security hidden trouble, and can save regeneration time; the regeneration expense can be saved by 90%; after regenerated, the quality of catalyst can be ensured.

Description

technical field [0001] The invention belongs to a regeneration method of a Pd or Pt or Pd-Pt noble metal catalyst, in particular to a regeneration method of a urea dehydrogenation noble metal catalyst. Background technique [0002] CO for urea synthesis 2 The raw material gas comes from the regeneration gas of the decarbonization section of the ammonia synthesis system, and the main component is CO 2 , additionally containing 0.1-1.5% by volume of H 2 and trace amounts of CO, CH 4 、CH 3 OH, C 6 h 6 and other impurities. For a long time, in order to prevent the corrosion of the urea synthesis system, it is necessary to 2 Add O to the feed gas 2 Or air, thus causing the hydrogen content in the urea synthesis tail gas to reach the explosion limit through cycle accumulation, and it will cause an explosion when encountering detonation energy such as static electricity. There have been many such serious explosion accidents in China. It is recognized both at home and abro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/08
CPCY02P20/584
Inventor 孔渝华严仲彪胡典明倪君帅刘华伟王先厚
Owner HAISO TECH
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