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Raw gas feeding system for propylene ammonia oxidation reactor

A technology of oxidation reactor and feeding system, which is applied in the raw material gas feeding system and the temperature field of propylene-ammonia mixed gas, which can solve the problems of reaction result deterioration, distributor nitriding embrittlement, uneven distribution of raw material gas, etc.

Pending Publication Date: 2019-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] What the present invention aims to solve is the technical problem that the local temperature of the propylene ammonia distributor is higher than the nitriding temperature in the conventional device, which leads to the nitriding embrittlement of the distributor, the uneven distribution of the raw material gas, and the deterioration of the reaction result.

Method used

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  • Raw gas feeding system for propylene ammonia oxidation reactor
  • Raw gas feeding system for propylene ammonia oxidation reactor
  • Raw gas feeding system for propylene ammonia oxidation reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153] The diameter of the fluidized bed reactor is 5.0 meters, the device is running at full load, and the raw material gas ratio is C 3 h 6 : NH 3 : air is 1:1.2:9.3, the reaction temperature is 440°C, and the reaction pressure is 55KPa. Propylene ammonia distributor adopts Figure 7 The material is carbon steel, and the diameter of the z-tube is φ80mm; the acryl-ammonia mixture reaches the nozzle at the end of each z-tube through the acryl-ammonia distributor, and the tail-end nozzle with the longest travel length of the acryl-ammonia mixture is in the z-tube At the point where the upper travel length is 2.42 meters, according to the relevant model data and existing experimental data, the inlet temperature of the acryl-ammonia mixture is controlled at 220°C, and the average temperature rise rate per unit length of the acryl-ammonia mixture is 52°C over the length of the z-tube. / m, then the temperature of the acryl-ammonia mixture in the nozzle is 346°C.

Embodiment 2

[0155] The diameter of the fluidized bed reactor is 5.4 meters, and the device operates at full load. The raw material gas ratio C3H6:NH3:air is 1:1.2:9.3, the reaction temperature is 440°C, and the reaction pressure is 55KPa. Propylene ammonia distributor adopts Figure 7 The material is carbon steel, and the diameter of the z-tube is φ90mm; the acryl-ammonia mixture reaches the nozzle at the end of each z-tube through the acryl-ammonia distributor, and the nozzle at the end of the z-tube has the longest travel length of the acryl-ammonia mixture At the point where the upper travel length is 2.6 meters, according to the relevant model data and existing experimental data, the inlet temperature of the acryl-ammonia mixture is controlled at 160°C, and the average temperature rise rate per unit length of the acryl-ammonia mixture is 60°C on the length of the z-tube travel. / m, then the temperature of the acryl-ammonia mixture in the nozzle is 316°C.

Embodiment 3

[0157] The diameter of the fluidized bed reactor is 7.5 meters, and the device operates at full capacity. The raw material gas ratio, reaction temperature, and reaction pressure are the same as in Example 1. Propylene ammonia distributor adopts Figure 7 The material is carbon steel, and the diameter of the z-tube is φ90mm; the acryl-ammonia mixture reaches the nozzle at the end of each z-tube through the acryl-ammonia distributor, and the nozzle at the end of the z-tube has the longest travel length of the acryl-ammonia mixture At the upper travel length of 3.65 meters, according to the relevant model data and existing experimental data, the inlet temperature of the acryl-ammonia mixture is controlled at 200°C, and the average temperature rise rate per unit length of the acryl-ammonia mixture is 40°C on the length of the z-tube. / m, then the temperature of the acryl-ammonia mixture in the nozzle is 346°C.

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Abstract

The invention provides a feeding system for a propylene ammonia oxidation reactor. The feeding system comprises a raw gas mixing system and a feed distributor; the feed distributor comprises a headerpipe, a main pipe, branch pipes and nozzles; the header pipe, the main pipe, the branch pipes and the nozzles are in fluid communication with one another, wherein the temperature Ti of a propylene ammonia mixed gas in any position of the feed distributor is lower than the temperature at which ammonia decomposes active nitrogen atoms. The propylene ammonia raw gas feeding system for propylene ammonia oxidation to prepare acrylonitrile can prevent the temperature of the mixed gas in any position in the propylene ammonia feed distributor from being lower than the temperature at which ammonia decomposes active nitrogen atoms, thereby reducing the risk of nitriding embrittlement in the propylene ammonia distributor.

Description

technical field [0001] The invention relates to a raw material gas feed system for a propylene ammoxidation reactor and a method for controlling the temperature of the propylene ammonia mixture gas in the propylene ammoxidation reactor through the feed system. Background technique [0002] Acrylonitrile is an important chemical raw material in petrochemical industry. All countries in the world generally adopt the one-step process of ammoxidation of propylene to produce acrylonitrile. [0003] Since the active temperature of the current commercial propylene ammoxidation catalyst is in the range of 400 to 450°C, in the production process of acrylonitrile, the propylene ammonia feed distributor (hereinafter sometimes referred to as "propylene ammonia distributor" or "feed distribution "or "distributor") at high temperature for a long time, the propylene ammonia mixture in the feed distributor (hereinafter referred to as the mixed gas) flows along the main pipe / main pipe / branch ...

Claims

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Application Information

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IPC IPC(8): B01J8/24C07C253/26C07C255/08
Inventor 赵乐吴粮华
Owner CHINA PETROLEUM & CHEM CORP