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Method for adjusting water content in carbonyl synthesis acetic acid system of iridium catalytic system

A catalytic system, oxo synthesis technology, applied in carbon monoxide reaction to prepare carboxylic acid, organic chemistry, etc., can solve the problems of reducing device production capacity, reducing catalyst solubility, increasing separation energy consumption, etc., to achieve increased output, high product quality, and composition stable effect

Pending Publication Date: 2021-09-17
重庆道为低碳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water must maintain a certain concentration. If the water concentration is too low, the solubility of the catalyst will be reduced and the catalyst will be lost; if the water concentration is too high, the energy consumption of the separation will be increased and the production capacity of the device will be reduced.

Method used

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  • Method for adjusting water content in carbonyl synthesis acetic acid system of iridium catalytic system
  • Method for adjusting water content in carbonyl synthesis acetic acid system of iridium catalytic system
  • Method for adjusting water content in carbonyl synthesis acetic acid system of iridium catalytic system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The feed rate of methanol is 0.5 tons / hour, the feed rate of methyl acetate is 0.5 tons / hour, under the conditions of temperature 190 ° C and pressure 3.0 MPa, the iridium complex of CO and methanol at 2000 ppm and cocatalyst methyl iodide The reaction is carried out in the fluid agitation reactor 1 under the action; the first water quantity detection probe 8a is set on the branch pipe connected to the circulating cooler 3, and the second water quantity detection probe 8b is set on the branch pipe connected to the flasher 2, and the water quantity detector 8 Take the average value of the detection amounts of the two detection probes to obtain a water content of 6% in the reaction solution.

[0028] Afterwards, the reaction solution flows out from the fluid agitation reactor 1 and enters the evaporator for flash evaporation, and performs preliminary separation of the mother liquor and crude acetic acid. The mother liquor returns to the reactor to continue the reaction. E...

Embodiment 2

[0030] The feed rate of methanol is 1.25 tons / hour, the feed rate of methyl acetate is 0.25 tons / hour, under the conditions of temperature 195 ° C and pressure 3.2 MPa, the iridium complex of CO and methanol at 1800 ppm and cocatalyst methyl iodide The reaction is carried out in the fluid agitation reactor 1 under the action; the first water quantity detection probe 8a is set on the branch pipe connected to the circulating cooler 3, and the second water quantity detection probe 8b is set on the branch pipe connected to the flasher 2, and the water quantity detector 8 Take the average value of the detection amounts of the two detection probes to obtain a water content of 8% in the reaction solution.

[0031] The reaction liquid flows out from the fluid agitation reactor 1 and enters the evaporator for flash evaporation to perform preliminary separation of the mother liquor and crude acetic acid. The mother liquor returns to the reactor to continue the reaction. Enter the water ...

Embodiment 3

[0033] The feed rate of methanol is 0.5 tons / hour, the feed rate of methyl acetate is 0.75 tons / hour, under the conditions of temperature 185 ° C and pressure 3.0 MPa, the iridium complex of CO and methanol at 1500 ppm and cocatalyst methyl iodide The reaction is carried out in the fluid agitation reactor 1 under the action; the first water quantity detection probe 8a is set on the branch pipe connected to the circulating cooler 3, and the second water quantity detection probe 8b is set on the branch pipe connected to the flasher 2, and the water quantity detector 8 Take the average value of the detection amounts of the two detection probes to obtain a water content of 4.5% in the reaction solution.

[0034] The reaction liquid flows out from the fluid agitation reactor 1 and enters the evaporator for flash evaporation to perform preliminary separation of the mother liquor and crude acetic acid. The mother liquor returns to the reactor to continue the reaction. Enter the water...

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Abstract

The invention discloses a method for adjusting water content in a carbonyl synthesis acetic acid system of an iridium catalytic system, and belongs to the technical field of acetic acid production. According to the method, the water content in the reaction system can be controlled by adjusting the composition of the reaction raw materials, and compared with an existing methanol low-pressure carbonyl acetic acid synthesis device, the reaction system is stable in composition, low in energy consumption and high in product quality. According to the method, the water content of a reaction system can be effectively reduced, so that the purpose of optimizing a subsequent flash evaporation and rectification system is achieved, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a method for adjusting water content in an iridium catalyzed carbonylation acetic acid system, which belongs to the technical field of acetic acid production. Background technique [0002] Acetic acid is a bulk chemical product and one of the most important organic acids. It can be mainly used in the production of vinyl acetate, acetic anhydride, acetate and cellulose acetate. It is widely used in pesticides, medicines and dyes, photographic medicine manufacturing, fabric printing and dyeing and rubber industry. Methanol carbonylation of acetic acid process; low-pressure method based on iridium-iodine catalyst, methyl iodide as co-catalyst, mild reaction conditions, high selectivity and conversion rate of acetic acid based on methanol and CO. In recent years, with the rapid expansion of domestic production capacity of methanol and its downstream products, methanol low-pressure carbonylation of acetic acid has become one of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/08C07C51/12
CPCC07C51/12C07C53/08
Inventor 吴其力李惟平
Owner 重庆道为低碳科技有限公司
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