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A kind of technique of low-pressure oxo synthesis of acetic anhydride

An oxo synthesis and acetic anhydride technology, applied in the preparation of carboxylic anhydride, organic chemistry, etc., can solve the problems of many side reaction products, short production cycle, complicated side reactions, etc. Effect

Active Publication Date: 2020-02-28
YANKUANG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, there are disadvantages such as complex side reactions, many side reaction products, fast tar generation, and short production cycle.

Method used

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  • A kind of technique of low-pressure oxo synthesis of acetic anhydride
  • A kind of technique of low-pressure oxo synthesis of acetic anhydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A system for low-pressure carbonylation of acetic anhydride, such as figure 1 As shown, the reactor group is included, and the reactor group is a series assembly of the first reactor 1 and the second reactor 2, and a pump 3 and a heat exchanger 4 are arranged between the first reactor 1 and the second reactor 2 , carbon monoxide, methyl acetate and catalyzer enter from the first reactor 1, the material at the bottom of the first reactor 1 is taken out by the pump 3 and enters the second reactor 2 through heat exchanger 4 heating, and the material in the second reactor 2 The product is passed into the rectification system, and the second reactor 2 is provided with a pipeline for feeding carbon monoxide.

[0042] Part of the material flowing out from the heat exchanger 4 is sent to the second reactor 2 , and the other part is sent to the first reactor 1 .

[0043] Both the tops of the first reactor 1 and the second reactor 2 are provided with exhaust lines. Each exhaust...

Embodiment 2

[0053] This embodiment is the same as Embodiment 1, the difference is:

[0054] The pressure of the first reactor 1 is 3.8MPa, the temperature is 175°C, and the catalyst concentration is 150ppm;

[0055] The second reactor 2 has a pressure of 3.5 MPa, a temperature of 175° C., and a catalyst concentration of 150 ppm.

Embodiment 3

[0057]A system for low-pressure carbonylation of acetic anhydride, such as figure 2 As shown, it includes a reactor group, a pump and a heat exchanger. The reactor group is a parallel assembly of the first reactor 1 and the second reactor 2, and carbon monoxide, methyl acetate and catalyst enter the first reactor 1 and the second reactor. In the second reactor 2, the material at the bottom of each reactor is pumped out by the pump 3 and then heated by the heat exchanger 4 and returned to the first reactor 1 and the second reactor 2. The first reactor 1 and the second reactor The product in kettle 2 is passed to the rectification system.

[0058] Both the tops of the first reactor 1 and the second reactor 2 are provided with exhaust lines.

[0059] Each exhaust line is connected to a condenser.

[0060] A kind of technology of low-pressure carbonylation acetic anhydride, as follows:

[0061] Carbon monoxide, methyl acetate, and the catalyst enter the first reactor 1 and the...

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Abstract

The invention discloses a system and a process for synthesizing acetic anhydride from low-pressure carbonyl. The system comprises a reaction kettle group, wherein the reaction kettle group is an assembly formed by connecting at least two reaction kettles in series or in parallel; in case of serial connection, a pump and a heat exchanger are arranged between every two adjacent serially connected reaction kettles; carbon monoxide, methyl acetate and a catalyst enter the system from the first stage of reaction kettle in the reaction kettle group; materials at the bottom of the reaction kettle enters the next stage of reaction kettle after being pumped out through the pump and heated through the heat exchanger till a product in the last stage of reaction kettle is fed into a distillation system; reaction kettles from the second stage to the last stage are all provided with pipelines for feeding the carbon monoxide; in case of parallel connection, carbon monoxide, methyl acetate and the catalyst enter every reaction kettle in the reaction kettle group; and the materials at the bottom of each reaction kettle flow back into every reaction kettle after being pumped out through the pumps and the heat exchangers, and a product in each reaction kettle is fed into the distillation system.

Description

technical field [0001] The invention relates to a system and process for low-pressure carbonylation of acetic anhydride. Background technique [0002] Acetic anhydride, also known as acetic anhydride, is a colorless transparent liquid. Acetic anhydride has a strong acetic acid smell, sour taste and hygroscopicity. Acetic anhydride is soluble in chloroform and ether, and slowly dissolves in water to form acetic acid. Acetic anhydride reacts with ethanol to form ethyl acetate. Its relative density is 1.080, melting point -73°C, boiling point 139°C, refractive index 1.3904, flash point 54°C, spontaneous ignition point 400°C, low toxicity, median lethal dose (rat, oral) 1780mg / kg. flammable. Corrosive. Acetic anhydride is an important acetylation reagent. Acetic anhydride is used in the manufacture of cellulose acetate, acetate plastics, and non-flammable film. Aspirin, sulfonamide drugs, etc. are mainly used in the production of disperse dark blue HCL, disperse bright red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/56C07C53/12
CPCC07C51/56C07C53/12
Inventor 蒋小川陈爱忠叶盛芳张志伟梁雪梅贺伟王进兵楚艳民张艳群张凤霞江在成
Owner YANKUANG GRP CO LTD
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