Iodomethane preparation method and acetic acid production method

A technology of methyl iodide and acetic acid, which is applied in the field of preparation of methyl iodide, can solve problems such as the reduction of carbonylation reaction rate, and achieve the effects of constant dosage, saving equipment costs, and maintaining the reaction rate

Active Publication Date: 2014-10-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem that methyl iodide as a cocatalyst in the traditional technology is lost due to the extremely volatile and causes the carbonylation reaction rate to decrease, and to provide a method for preparing methyl iodide and a production method for acetic acid

Method used

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  • Iodomethane preparation method and acetic acid production method

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Effect test

Embodiment 1

[0061] This embodiment is used to illustrate the production method of acetic acid provided by the invention.

[0062] according to figure 1 The acetic acid production process flow chart shown carries out acetic acid production. The light components rectification column is simulated by a packed column with 60 theoretical plates.

[0063] Methanol with a material flow rate of 2457g / h and CO of 2408g / h are continuously fed into the 5L zirconium material reactor 1, and the Rh containing 200 wtppm, the Ir of 2000 wtppm, the Ru of 2000 wtppm, 8% by weight iodomethane, 5% by weight of water, 12% by weight of methyl acetate, and all the other being 528g of acetic acid reaction solution (the volume of the reaction solution is 4L) into the reactor 1 to carry out the carbonylation reaction, the temperature of the reaction is 190 °C, and the reaction pressure is 3.0 MPa. The mixture obtained after the reaction is sent to the flash tower 2 for flash evaporation to obtain a gas phase com...

Embodiment 2

[0071] This embodiment is used to illustrate the production method of acetic acid provided by the invention.

[0072] according to figure 1 The acetic acid production process flow chart shown carries out acetic acid production. A packed column with 40 theoretical plates was used to simulate the distillation column.

[0073] The methanol and the CO of 2311g / h that material flow rate is 2316g / h are continuously sent in the 5L zirconium material reactor 1, and the Rh that contains 200 wtppm, the Ir of 1500 wtppm, the Ru of 1500 wtppm, 9 wt% iodomethane, 5.5% by weight of water, 12% by weight of methyl acetate, all the other being 528g of acetic acid reaction solution (the volume of the reaction solution is 4L) into the reactor 1 for carbonylation, the temperature of the reaction is 195 °C, the reaction pressure is 2.8MPa. The mixture obtained after the reaction is sent to the flash tower 2 for flash evaporation to obtain a gas phase component containing acetic acid and an acet...

Embodiment 3

[0081] This embodiment is used to illustrate the production method of acetic acid provided by the invention.

[0082] according to figure 1 The acetic acid production process flow chart shown carries out acetic acid production. The rectification column is simulated by a packed column with 50 theoretical plates.

[0083] The methanol and the CO of 2208g / h that material flow rate is 2253g / h are continuously sent in the 5L zirconium material reactor, and the Rh that contains 200 wtppm, the Ir of 2500 wtppm, the Ru of 1500 wtppm, the Ru of 7 wt% Iodomethane, the water of 4.5% by weight, the methyl acetate of 12% by weight, all the other are the reaction solution of 528 grams of acetic acid (the volume of reaction solution is 4L) and pass in the reactor 1 and carry out carbonylation reaction, the temperature of reaction is 185 °C, the reaction pressure is 3.2MPa. The mixture obtained after the reaction is sent to the flash tower 2 for flash evaporation to obtain the gas phase co...

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Abstract

The invention provides an iodomethane preparation method and an acetic acid production method. The acetic acid production method comprises the following steps: under a carbonylation reaction condition, transporting methanol and CO into a reactor to contact the methanol and CO in the reactor in the presence of a main catalyst, an iodomethane co-catalyst, an organic solvent, methyl acetate, and water; transporting the mixture of the methanol and CO after the contacting to a flash evaporation tower to carry out flash evaporation, and transporting the acetic acid-containing gas phase component obtained in the flash evaporation to a light component rectifying tower to carry out rectification. The method also comprises steps of detecting the iodomethane content in the reactor and judging whether the iodomethane content meets the carbonylation reaction requirements or not; when the iodomethane is insufficient, methanol and hydrogen iodide are fed into the light component rectifying tower so as to generate iodomethane in the light component rectifying tower during the rectification process; the generated iodomethane can be taken as one part of the light component, then the iodomethane is separated and returned to the reactor, and the organic solvent is organic carboxylic acids with a carbon number of 2 to 5. The method can maintain the carbonylation reaction speed, and avoids the iodomethane leakage hazard during the transportation process.

Description

technical field [0001] The invention relates to a method for preparing methyl iodide and a method for producing acetic acid. Background technique [0002] Acetic acid is one of the important organic chemical raw materials. It is mainly used in the production of vinyl acetate, acetic anhydride, cellulose acetate, acetates, terephthalic acid, chloroacetic acid, etc. It can be widely used in chemical industry, light industry, textile, medicine, Printing and dyeing and other fields. At present, the main methods of producing acetic acid are acetaldehyde oxidation, olefin direct oxidation and methanol carbonylation. Among them, the methanol carbonylation method has the advantages of high methanol conversion rate and small by-products, and has gradually become one of the main methods for the production of acetic acid. [0003] The carbonylation of methanol to acetic acid process mainly includes two parts: CO gas generation and acetic acid production. Taking natural gas as raw ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/07C07C17/16C07C53/08C07C51/12
Inventor 吕顺丰李彤刘博王世亮秦燕璜
Owner CHINA PETROLEUM & CHEM CORP
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