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Method for preparing synthetic ammonia from low-H2/N2-ratio synthesis gas

A technology for H2-N2 and ammonia synthesis, which is applied in the preparation/separation of ammonia, production of bulk chemicals, etc., and can solve the problems of low utilization rate of synthesis gas and low ammonia yield.

Inactive Publication Date: 2016-07-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for low H 2 / N 2 A method for producing synthetic ammonia from synthetic gas to solve the defects of low ammonia yield and low utilization rate of synthetic gas in the prior art synthetic ammonia method

Method used

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  • Method for preparing synthetic ammonia from low-H2/N2-ratio synthesis gas

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Experimental program
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Effect test

Embodiment 1

[0078] Fresh normal temperature low pressure syngas H 2 / N 2 The ratio is 3.00. According to the calculation of the KBR three-tower process, the pressure of synthesis gas entering the first iron-based catalyst reactor is 150atm, the temperature of synthesis gas entering the first iron-based catalyst reactor is 350℃, and the synthesis gas entering the second and third reactors The temperature of each iron-based catalyst reactor is 380℃, the circulating gas purge ratio is 4%, and the catalyst loading volume of the first iron-based catalyst reactor is 15m 3 , The first iron-based catalyst reactor has a catalyst loading capacity of 25m 3 , The first iron-based catalyst reactor has a catalyst loading capacity of 40m 3 , The final export ammonia concentration is 20.92%, and the production index is shown in Table 1.

[0079] Table 1 Reaction pressure 150atm, H 2 / N 2 =3.0 iron catalyst production index value

[0080]

Embodiment 2

[0082] Fresh normal temperature low pressure syngas H 2 / N 2 The ratio is 3.00, the pressure of synthesis gas entering the iron-based catalyst reactor is 150atm, the temperature of synthesis gas entering the iron-based catalyst reactor is 350℃, the temperature of synthesis gas entering the four ruthenium-based catalyst reactors is 360℃, and the circulating gas is released The proportion is 4%, and the iron-based catalyst reactor catalyst loading capacity is 15m 3 , The first ruthenium-based catalyst reactor has a catalyst loading capacity of 5m 3 , The second ruthenium-based catalyst reactor has a catalyst loading capacity of 6m 3 , The third ruthenium-based catalyst reactor catalyst loading capacity 7m 3 , The fourth ruthenium-based catalyst reactor catalyst loading capacity 9m 3 , The final export ammonia concentration is 24.80%, and the production index is shown in Table 2.

[0083] Table 2 Reaction pressure 150atm, H 2 / N 2 =3.0 production index value of iron string ruthenium c...

Embodiment 3

[0086] Fresh normal temperature low pressure syngas H 2 / N 2 The ratio is 2.95, the pressure of synthesis gas entering the iron-based catalyst reactor is 150atm, the temperature of synthesis gas entering the iron-based catalyst reactor is 350℃, the temperature of synthesis gas entering the four ruthenium-based catalyst reactors is 360℃, and the circulating gas is released The proportion is 4%, and the iron-based catalyst reactor catalyst loading capacity is 15m 3 , The first ruthenium-based catalyst reactor has a catalyst loading capacity of 5m 3 , The second ruthenium-based catalyst reactor has a catalyst loading capacity of 6m 3 , The third ruthenium-based catalyst reactor catalyst loading capacity 7m 3 , The fourth ruthenium-based catalyst reactor catalyst loading capacity 9m 3 , Into the first ruthenium-based catalyst H 2 / N 2 =2.52, the final outlet ammonia concentration is 25.52%, and the production index is shown in Table 3.

[0087] Table 3 Reaction pressure 150atm, H 2 / N ...

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Abstract

The invention discloses a method for low H 2 / N 2 A method for producing synthetic ammonia from synthetic gas, comprising: Step 1: converting H below the stoichiometric ratio 2 -N 2 The synthesis gas is mixed with the circulating synthesis gas, pressurized by the compressor and preheated by the heat exchanger; step 2: the preheated mixed gas in step 1 first passes through an iron-based catalyst synthesis ammonia reactor, so that the outlet ammonia concentration reaches or exceeds 10 %, mixed gas H 2 / N 2 The ratio drops to or lower than 2.8; step 3: the mixed gas in step 2 passes through four alternately arranged heat exchangers and ruthenium-based catalyst synthesis ammonia reactors in turn, and the final outlet ammonia concentration reaches more than 25%; H 2 / N 2 The ratio is 1.00 to 2.50. This structure is beneficial to control the temperature of the catalyst bed, to ensure that the catalyst does not overheat, and to exert the high activity of the ruthenium-based catalyst under relatively low temperature and low pressure conditions, while maintaining the structure and stability of the ruthenium-based ammonia synthesis catalyst. Effectively improve the final outlet ammonia concentration of synthetic ammonia under the premise of high efficiency, which can reach more than 25%.

Description

Technical field [0001] The invention relates to low H 2 / N 2 The method for preparing synthetic ammonia from synthetic gas belongs to the technical field of synthetic ammonia chemical technology and energy recovery and utilization. Background technique [0002] Hydrogen is an important energy carrier, and its production can use different raw materials and processes. Industrial hydrogen production technologies include hydrocarbon steam reforming method, coal gasification method, heavy oil partial oxidation method, water electrolysis method, by-product hydrogen-containing gas recovery method, etc. The main hydrogen production technologies are steam reforming of natural gas and partial oxidation of coal. the Lord. At present, the world consumes about 50 million tons of hydrogen each year, and the domestic hydrogen consumption exceeds 10 million tons, ranking first in the world. Among them, the synthesis gas used for the synthesis of ammonia and methanol uses more than 80% of hydrog...

Claims

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Application Information

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IPC IPC(8): C01C1/04
CPCY02P20/52
Inventor 李庆勋孔繁华张天釜徐显明刘克峰刘晓彤
Owner PETROCHINA CO LTD
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