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Method for recovering useful ingredient from methane end gas containing iodine

A tail gas and methane technology, applied in separation methods, chemical instruments and methods, organic chemistry, etc., can solve the problems of increasing methanol, increasing raw material consumption, environmental pollution, etc., to reduce emissions, save raw materials and energy, and reduce production costs Effect

Active Publication Date: 2008-01-02
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of methanol as the absorbent, the concentration of methanol will inevitably increase in the exhaust tail gas, which will increase the consumption of raw materials and cause environmental pollution

Method used

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  • Method for recovering useful ingredient from methane end gas containing iodine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1 Low-pressure carbonylation of methanol to synthesize acetic acid Medium and high-pressure absorption tower absorbs with methanol at normal temperature

[0012] The tail gas entering the tower with a flow rate of 83kmol / h and a temperature of 50°C has a composition (V%, the same below) of CO 74.9%, CO 2 4.0%, H 2 11.6%, N 2 2.8%, CH 4 1.3%, CH 3 I 5.1% and trace amounts of methyl acetate, methanol, water, and acetic acid are absorbed by methanol with a flow rate of 85kmol / h and a temperature of 35°C. The pressure of the absorption tower is 2.85MPa, and the temperature of the tail gas exiting the tower is 35.7°C. Condensation to 15°C consumes energy 11.3kw, its composition is CO 80.0%, CO 2 3.0%, H 2 12.5%, N 2 3.0%, CH 4 1.4%, CH 3 I 0%, CH 3 OH<0.5%.

[0013] Comparative example 1 Chinese patent application CN15209204 medium and high pressure absorption tower absorbs with condensed methanol

[0014] The tail gas entering the tower with a flow...

Embodiment 2

[0018] Embodiment 2 Methanol low-pressure carbonylation synthesis acetic acid medium-low pressure absorption tower absorbs with methanol at normal temperature

[0019] The tail gas entering the tower with a flow rate of 30kmol / h and a temperature of 15°C is composed of CO 41.6%, CO 2 24.9%, H 2 6.1%, N 2 5.5%, CH 4 0.7%, CH 3 I 20.1%, methyl acetate 0.8%, and trace amounts of methanol, water, and acetic acid are absorbed by methanol with a flow rate of 120kmol / h and a temperature of 25°C. The pressure of the absorption tower is 0.25MPa, and the temperature of the tail gas exiting the tower is 26.0°C. Condensate to -15°C , energy consumption 27.71kw, its composition is CO 53.8%, CO 2 29.6%, H 2 7.9%, N 2 7.2%, CH 4 0.9%, CH 3 I 0%, CH 3 OH 0.7%.

Embodiment 3

[0022] Example 3 In the process of carbonylation to synthesize acetic anhydride, the tail gas purification tower is absorbed by methanol at normal temperature

[0023] The tail gas entering the tower with a flow rate of 120kmol / h and a temperature of 15°C is composed of CO 52.7%, CO 2 31.6%, H 2 7.8%, N 2 7.0%, CH 4 0.9%, and a small amount of methyl iodide and methyl acetate, absorbed by methanol with a flow rate of 120kmol / h and a temperature of 25°C, the pressure of the absorption tower is 0.25MPa, the temperature of the exhaust gas exiting the tower is 19.1°C, condensed to -15°C, and the energy consumption is 100.57kw , its composition is CO 52.9%, CO 2 30.7%, H 2 7.8%, N 2 7.0%, CH 4 0.9%, CH 3 I 0%, CH 3 OH 0.7%.

[0024] No condensation process in the process of comparative example 4 embodiment 3

[0025] The tail gas entering the tower with a flow rate of 120kmol / h and a temperature of 15°C is composed of CO 52.7%, CO 2 31.6%, H 27.8%, N 2 7.0%, C...

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Abstract

The invention discloses a recovering method of useful component from the lodized methane tail gas, which is characterized by the following: absorbing the useful component of the lodized methane tail gas; recovering the methanol from tail gas through condensing. The invention reduces the methanol density in the tail gas, which saves the consumption of raw material and reduces the environmental pollution.

Description

technical field [0001] The invention relates to a method for recovering useful components from tail gas containing methyl iodide, in particular to a method for recovering useful components containing methyl iodide in the tail gas by using methanol as an absorbent. Background technique [0002] In the low-pressure carbonylation of methanol to acetic acid or the carbonylation of acetic acid and acetic anhydride, methyl acetate or dimethyl ether to acetic anhydride, whether rhodium-based catalysts, iridium-based catalysts or nickel-based catalysts are used, methyl iodide will be added as a cocatalyst . The high-pressure tail gas and low-pressure tail gas in the above process contain useful components such as methyl iodide, acetic acid, and methyl acetate. If the tail gas is directly discharged or incinerated, it will pollute the environment. Therefore, useful components such as methyl iodide must be recovered. . Chinese patent application CN1520920A discloses a process for re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14C07C51/12C07C53/08
Inventor 胡文励曾健李煊毛震波廖炯王晓东陈群文
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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