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Method for increasing production capacity of acrylonitrile or methacrylonitrile

A technology of methacrylonitrile and high production capacity, which is applied in the preparation of hydrocarbon ammoxidation, organic chemistry, etc., can solve the problems of large investment and high difficulty of on-site construction, and achieve reduced construction strength, good technical effects and economic benefits, and simple construction Effect

Active Publication Date: 2013-12-18
CHINA PETROCHEMICAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is aimed at increasing the production capacity device or transformation of the existing technology in order to increase the production capacity of acrylonitrile or methacrylonitrile; Higher problem, providing a new method to increase the production capacity of acrylonitrile or methacrylonitrile

Method used

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  • Method for increasing production capacity of acrylonitrile or methacrylonitrile
  • Method for increasing production capacity of acrylonitrile or methacrylonitrile
  • Method for increasing production capacity of acrylonitrile or methacrylonitrile

Examples

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Effect test

Embodiment 1

[0032] A set of acrylonitrile (or methacrylonitrile) production equipment adopts the propylene ammoxidation method, and the raw material gas enters the fluidized bed reaction from the bottom with the ratio of propylene (or isobutylene): ammonia: air = 1: 1: 9.8 (mol) The reaction temperature is 430°C, the pressure is 0.15MPa (absolute pressure), the catalyst is molybdenum-bismuth catalyst, and the heat of reaction is recycled with soft water to generate high-pressure steam. After the reaction, the gas can be washed, absorbed and rectified to obtain high-purity acrylonitrile or methacrylonitrile.

[0033]The acrylonitrile or methacrylonitrile production plant with an annual output of 70,000 tons will increase its production capacity to 80,000 tons per year with the original reactor shell and the position of the original cooling water pipe inlet and outlet unchanged. During the renovation process, the diameter of the reactor shell remained unchanged at 7470 mm, and the height of...

Embodiment 2

[0035] The proportioning, reaction conditions, and reaction process of the raw material gas for producing acrylonitrile or methacrylonitrile are the same as [Example 1].

[0036] The acrylonitrile or methacrylonitrile production plant with an annual output of 70,000 tons will be increased to an annual output of 92,000 tons while the original reactor shell and the position of the inlet and outlet of the original cooling water pipe remain unchanged. The diameter of the reactor shell remains unchanged at 7470mm, and the height of the shell remains unchanged at 17500mm. In order to increase the output, the support beam 2 is increased by 1 meter, and the height of the cooling water pipe is also increased by 1 meter. The straight pipe section is increased from the original 5790mm To 6790mm, in order to withdraw the heat generated by increasing the reaction raw materials. The inlet and outlet flanges 5 and 6 of the cooling water pipes and the support beam 2 are old, and the cooling w...

Embodiment 3

[0038] The proportioning, reaction conditions, and reaction process of the raw material gas for producing acrylonitrile or methacrylonitrile are the same as [Example 1].

[0039] The original production capacity of acrylonitrile or methacrylonitrile with an annual output of 70,000 tons will be increased to 105,000 tons per year while the original reactor shell and the position of the inlet and outlet of the original cooling water pipe remain unchanged. The diameter of the reactor shell remains unchanged at 7470mm, and the height of the shell remains unchanged at 17500mm. In order to increase the output, the support beam 2 is increased by 1.5 meters, and the height of the cooling water pipe is also increased by 1.5 meters. The straight pipe section is increased from the original 5790mm To 7200mm, in order to withdraw the heat generated by increasing the reaction raw materials. The inlet and outlet flanges 5 and 6 of the cooling water pipes and the support beam 2 are old, and th...

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Abstract

The invention relates to a method for increasing production capacity of acrylonitrile or methacrylonitrile, which mainly overcomes the problems of large investment and higher site construction difficulty in the prior art of reconstructing an acrylonitrile reactor for increasing the production capacity of acrylonitrile or methacrylonitrile. The invention takes propylene or isobutylene, ammonia and oxygen as raw materials through adopting the method of increasing production capacity of acrylonitrile or methacrylonitrile, wherein raw materials and a catalyst in a fluidized bed reactor are contacted under effective reaction conditions to react and generate acrylonitrile or methacrylonitrile. The method is characterized in that under the conditions that the production capacity of acrylonitrile or methacrylonitrile is increased by 15-50%, and an original reactor casing and the inlet and the outlet of an original cooling water pipe are kept unchangeable, the problems are solved better through the technical scheme of increasing the a radiation area required for removing the heat generated by reaction of added raw materials. The method can be used in the reconstruction of a device for increasing production capacity of acrylonitrile or methacrylonitrile.

Description

technical field [0001] The invention relates to a method for increasing the production capacity of acrylonitrile or methacrylonitrile, in particular to a method for increasing the production capacity of acrylonitrile or methacrylonitrile without changing the positions of the original reactor shell and the inlet and outlet of the original cooling water pipe . Background technique [0002] Since the synthesis of acrylonitrile or methacrylonitrile by propylene ammoxidation is a strong exothermic reaction, a large amount of heat will be generated during the reaction. Taking the acrylonitrile reaction as an example, the reaction formula is: [0003] [0004] For this purpose, the reaction is usually carried out in a fluidized bed reactor. The reactor is equipped with multiple sets of cooling water pipes, which is beneficial to remove the generated heat. [0005] In recent years, with the large demand for acrylonitrile and methacrylonitrile in the domestic and foreign markets...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C255/08C07C253/26
Inventor 栗根喜崔金栋齐春昌杨四海赵斌义
Owner CHINA PETROCHEMICAL CORP
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