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Method for removing hydrogen impurity in CO feed gas by selective oxidation of NO

A technology of selective oxidation and raw material gas, applied in chemical instruments and methods, separation methods, carbon monoxide, etc., can solve problems such as decomposition and excess nitrite, and achieve the effects of cost reduction and process simplification

Active Publication Date: 2019-04-16
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method utilizes NO to completely or partially replace O 2 As an oxidant, it aims to solve the O present in the original dehydrogenation process 2 Excess problem and nitrite decomposition problem in the subsequent CO synthesis process

Method used

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  • Method for removing hydrogen impurity in CO feed gas by selective oxidation of NO

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Experimental program
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Effect test

Embodiment 1

[0022] 1. Weigh 5g catalyst I Pd / CaO-Nb 2 o 5 Dilute it with quartz sand at 1:4 and fill it into fixed bed I (105). The mass percent of Pd in ​​catalyst I is 1wt.%, the mass percent of CaO is 40wt.%, and the mass percent of Nb2 o 5 The mass percentage of is 59wt.%. Weigh 5g Catalyst II Pd-Rh / CeO 2 Dilute with quartz sand at a ratio of 1:1 and fill it into fixed bed II (106). The mass percentage of Pd in ​​catalyst II is 1.5wt.%, the mass percentage of Rh is 0.3wt.%, CeO 2 The mass percentage of is 98.2wt.%.

[0023] 2. Open 112 and close 113, 114 and 115 to switch the system to the pretreatment gas circuit. The fixed bed I (105) is preheated to 80°C and then directly fed with NO gas. When the pressure reaches 0.5MPa, the 112 is closed, and the 115 is opened to vent after 0.5h of treatment. After the pressure drops to 0.1 MPa, close 115 and open 112 again, and repeat the above process 6 times to complete the NO pre-adsorption treatment.

[0024] 3. Close 112 and 115, open...

Embodiment 2

[0029] 1. Weigh 5g catalyst I Rh / MgO-Nb 2 o 5 Dilute it with quartz sand at 1:4 and fill it into fixed bed I (105). The mass percent of Rh in catalyst I is 0.5wt.%, the mass percent of MgO is 30wt.%, and the mass percent of Nb 2 o 5 The mass percentage of is 69.5wt.%. Weigh 5g Catalyst II Pd-Rh / CeO 2 Dilute with quartz sand at 1:1 and pack into fixed bed II (106), the mass percent of Pd in ​​the catalyst II is 1.2wt.%, the mass percent of Rh is: 0.8wt.%, CeO 2 The mass percentage of is 98wt.%.

[0030] 2. Open 112 and close 113, 114 and 115 to switch the system to the pretreatment gas circuit. The fixed bed I (105) is preheated to 80°C and then directly fed with NO gas. When the pressure reaches 0.5MPa, the 112 is closed, and the 115 is opened to vent after 0.5h of treatment. After the pressure drops to 0.1 MPa, close 115 and open 112 again, and repeat the above process 6 times to complete the NO pre-adsorption treatment.

[0031] 3. Close 112 and 115, open 113 and 114....

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Abstract

The invention discloses a method for removing an H2 impurity from CO raw gas through selective oxidation of NO. According to the method, NO completely or partially replaces O2 to serve as an oxidizing agent, and the H2 impurity in the CO raw gas can be removed through a selective oxidation reaction. The technical method comprises two stages of dehydrogenation processes, two catalysts with different ingredients and different effects are adopted for driving respectively, by means of layered dehydrogenation, the proportion of No, N2O and O2 in tail gas can be controlled flexibly, an operator performs specific adjustment conveniently according to the requirement of a follow-up CO synthetic process for raw gas composition, the whole process has higher efficiency and operability, and the problems of excessive O2 in the original dehydrogenation process, proneness of nitrite to decomposition in the follow-up CO synthetic process and the like are solved. The method can be applied to dehydrogenation purification of CO raw gas for synthesis of oxalate, carbonate and ethylene glycol.

Description

technical field [0001] The invention relates to a technical method for the dehydrogenation and purification of CO raw material gas, in particular to a method for completely or partially replacing O with NO 2 , Removal of H from CO feed gas by selective oxidation reaction 2 The method of impurity and the catalyst used. This method is mainly used in the dehydrogenation and purification of CO raw material gas for the synthesis of oxalate, carbonate and ethylene glycol. Background technique [0002] CO obtained from the reformation of fossil resources such as coal is an important chemical raw material. It is widely used in important technical fields such as coal-to-oxalate, coal-to-carbonate, and coal-to-ethylene glycol, which can generate huge economic benefits. This technical route requires the use of high-purity CO feed gas, especially for H in CO 2 The content of impurities has special requirements, because H 2 The existence of serious affects the efficiency of the CO sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/40B01D53/00
CPCB01D53/00B01D2251/10B01D2256/20B01D2257/108C01B2210/0004C01B2210/0053C01P2006/80
Inventor 姚元根乔路阳周张锋崔国静宗珊珊吴娟许东杰
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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