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Preparation of nitrile compounds

A compound and organic compound technology, which is applied in the field of preparation of polynitrile compounds, can solve the problems of single-flow yield drop, low reaction rate, and reduced productivity of nitrile compounds, and achieve the goals of suppressing side reactions, reducing losses, and high yields Effect

Inactive Publication Date: 2003-06-18
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to suppress the combustion reaction, a method of controlling the raw material at a low reaction rate and recycling the unreacted raw material is implemented, but there is a problem that the one-pass yield of the nitrile compound is reduced, and the productivity is reduced.

Method used

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  • Preparation of nitrile compounds

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The ammoxidation reaction of m-xylene was carried out using the ammoxidation reactor shown in FIG. 1 . 2.3 tons of the above-prepared mobile catalyst were filled in an ammoxidation reactor, and air, m-xylene (MX), and ammonia gas were preheated at 180°C and supplied to the reactor. Supply rate is MX 266kg / hr, MTN 40.0kg / hr, ammonia 412kg / hr, air 1570Nm 3 / hr. The reaction is carried out at a reaction pressure of 0.08Mpa to obtain isophthalonitrile (IPN). The reaction temperature was set at 427°C. The freshly supplied MX (new supply flow) was substantially the same as the comparative example, 241.8 kg / hr, the circulating supply flow MX was 24.2 kg / hr, and the MTN was 40.0 kg / hr. The molar ratio of the flow rate of the mononitrile compound at the reactor outlet to the total flow rate of the poly-substituted organic compound and the mononitrile compound supplied to the reactor was 12.0 mol%.

[0041] The reaction gas was analyzed, containing MX 24.2kg / hr, IPN 257.2kg / h...

Embodiment 2

[0044] The ammoxidation reaction of m-xylene was carried out using the ammoxidation reactor shown in FIG. 1 . 2.3 tons of the above-prepared mobile catalyst were filled in an ammoxidation reactor, and air, m-xylene (MX), and ammonia gas were preheated at 180°C and supplied to the reactor. Supply rate is MX245.6kg / hr, MTN 10.7kg / hr, ammonia 350kg / hr, air 1320Nm 3 / hr. The reaction is carried out at a reaction pressure of 0.08Mpa to obtain isophthalonitrile (IPN). The reaction temperature was set at 427°C. The freshly supplied MX (new supply flow) was 242 kg / hr as in the comparative example, the circulating supply flow MX was 3.6 kg / hr, and the MTN was 10.7 kg / hr. The molar ratio of the flow rate of the mononitrile compound at the reactor outlet to the total flow rate of the MX poly-substituted organic compound and the mononitrile compound supplied to the reactor was 3.8 mol%.

[0045] The reaction gas was analyzed, containing MX 3.6kg / hr, IPN 247kg / hr, MTN 10.7kg / hr.

[00...

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Abstract

In a process for producing a polynitrile compound comprising introducing a polysubstituted organic compound (POC) which is a carbon ring or heterocyclic compounds having a plurality of organic substituents into a reactor with ammonia and a gas containing oxygen and ammoxidizing POC in the presence of a catalyst, at least a portion of the unreacted POC and a mononitrile compound of an intermediate product in the reaction gas discharged from the reactor is separated, recovered and recycled to the reactor so that the flow rate of the mononitrile compound at the outlet of the reactor is 2 to 16% by mole of the total flow rate of POC and the mononitrile compound supplied to the reactor. Burning reaction of the side reaction is suppressed and the loss of POC can be decreased without adverse effects on productivity and the polynitrile compound can be obtained at a high yield.

Description

technical field [0001] The present invention relates to a method for preparing polynitrile compounds, and a method for preparing polynitrile compounds by reacting carbocyclic compounds or heterocyclic compounds with multiple organic substituents with ammonia and a gas containing oxygen. In particular, it relates to a method for preparing a carbocyclic dinitrile compound or a heterocyclic dinitrile compound from a carbocyclic compound or a heterocyclic compound having two organic substituents. Background technique [0002] Polynitrile compounds, especially carbocyclic dinitrile compounds are used as raw materials for the preparation of synthetic resins, pesticides, etc., and intermediate raw materials such as amines and isocyanates. On the other hand, heterocyclic dinitrile compounds are used as intermediate raw materials for pharmaceuticals, feed additives, food additives, and the like. [0003] The method of reacting organic compounds such as carbocyclic compounds or heter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/28C07C255/51
CPCC07C253/28C07C255/51
Inventor 中村健一江端秀司田中文生设乐琢治
Owner MITSUBISHI GAS CHEM CO INC
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