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Medium-pressure nitric acid production process and equipment

A production process and production equipment technology, applied in the field of medium-pressure nitric acid production process and production equipment, to achieve the effects of reducing equipment, saving investment costs, and low ammonia consumption

Pending Publication Date: 2019-12-06
CHINA CHENGDA ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 1. More nitrogen oxide gas compressors and high-pressure nitrogen oxide systems need to be installed;

Method used

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  • Medium-pressure nitric acid production process and equipment

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Embodiment 1

[0045] This embodiment specifically relates to a medium-pressure nitric acid production process. Taking the production of nitric acid with an annual output of 200,000 tons as an example, the process steps are as follows:

[0046] S1: Using air compressor to 102100Nm 3 / h rate compresses air to 0.5~0.6Mpa, of which 75600Nm 3 / h of process air and 93300Nm 3 / h of ammonia is mixed in the ammonia air mixer, and then the mixed gas is passed into the oxidation reactor;

[0047] S2: The mixed gas sequentially passes through the platinum catalyst layer and N in the oxidation reactor from top to bottom 2 O decomposes the catalyst layer to carry out the catalytic oxidation reaction of ammonia. The reaction temperature is 860℃~900℃, and the production contains NO x The primary gas;

[0048] Among them, the mixed gas reacts to generate NO when passing through the platinum catalyst layer x , Then pass N 2 O decomposition catalyst layer will N 2 O decomposes to generate nitrogen, making N 2 The O c...

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Abstract

The invention discloses a medium-pressure nitric acid production process. The medium-pressure nitric acid production process is characterized in that the ammoxidation and absorption pressure is 0.5-0.6 MPa; tail gas of an absorption tower passes through a carbon molecular sieve temperature swing adsorption (TSA) treatment device, so that the content of nitrogen oxides in the tail gas is reduced tobe less than 100 mg / Nm<3>; air compressor process air is used as regeneration desorption air of the carbon molecular sieve TSA treatment device, and the regeneration desorption air containing the nitrogen oxides can be returned to an oxidation reactor for reuse; a layer of N2O decomposition catalyst is added in the oxidation reactor to reduce the content of the N2O to 50-100 PPM through reaction;and a nitric acid bleaching tower is arranged at the bottom of the absorption tower, and the nitric acid bleaching tower and the absorption tower are integrated, so that the process is shortened, andthe equipment investment is reduced.

Description

Technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a medium-pressure nitric acid production process and production equipment, in particular to a medium-pressure nitric acid production process and production equipment using carbon molecular sieve temperature swing adsorption (TSA) tail gas nitrogen oxide reuse. Background technique [0002] Nitric acid is an important basic chemical raw material, which is widely used in the production of dyes, explosives, medicine, plastics, nitrogen fertilizers, chemical reagents, and in metallurgy and organic synthesis. At present, there are atmospheric pressure method, medium pressure method, high pressure method and double pressure method for producing nitric acid using ammonia and air at home and abroad. [0003] The atmospheric pressure method, that is, the oxidation of ammonia and the absorption of nitrogen oxides are carried out under atmospheric pressure. This method is characterized by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/26C01B21/28C01B21/38
CPCC01B21/26C01B21/28C01B21/38Y02P20/10
Inventor 曾纪龙周彦明王时川倪慧
Owner CHINA CHENGDA ENG
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