Multifunctional tower for carbonyl synthesis process of acetic acid

A carbonylation and multi-functional technology, applied in carbon monoxide reaction to prepare carboxylic acid, chemical instruments and methods, distillation and separation, etc., can solve the problems of increasing equipment investment and prolonging the process flow, so as to reduce equipment investment, simplify the process route, reduce effect of difficulty

Inactive Publication Date: 2009-08-12
BEIJING ZEHUA CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing acetic acid production process, the two steps of flash evaporation and light removal are completed by two devices, which not only prolongs the process flow, but also increases the investment in equipment

Method used

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  • Multifunctional tower for carbonyl synthesis process of acetic acid
  • Multifunctional tower for carbonyl synthesis process of acetic acid
  • Multifunctional tower for carbonyl synthesis process of acetic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Described multi-functional column device such as figure 2 As shown, it is a vertical column, which includes light removal section A and flash evaporation section B from top to bottom. The reflux port 4, the product outlet 2 located in the light removal section and the liquid phase outlet 5 located at the bottom of the tower.

[0039] The light removal section uses trays 9, the number of trays is 8, and a demister 10 is arranged at the lower end of the product outlet. A streamline distributor 8 is set in the flash section.

[0040] When the multifunctional column is used in the oxo acetic acid unit, the catalyst-containing reaction liquid derived from the reactor enters the flashing section B of the multifunctional column from the material inlet 1, and flashes under reduced pressure It is a gas-liquid two-phase; the gas phase containing acetic acid, methyl iodide and other light components enters the light removal section A, removes the droplets containing catalysts e...

Embodiment 2

[0044] Described multi-functional column device such as image 3 As shown, the structure is similar to that of Example 1. Eight trays are set in the delightening section A, of which the lower two trays are used as the washing section C, and the washing liquid inlet 6 is set at the upper end of the washing section.

[0045] When the multi-functional column is used in the oxo acetic acid unit, the washing liquid enters the washing section from the washing liquid inlet, and the catalyst that may be entrained in the light removal section A in the gas phase after the flash is eluted, further effectively controlling the loss of the catalyst . All the other are with embodiment 1.

[0046] The washing liquid can be the liquid at the bottom of the light removal section directly entering the washing section as the washing liquid, the liquid drawn from any position in the multifunctional tower, part of the crude acetic acid obtained from the product outlet, or the liquid drawn from othe...

Embodiment 3

[0048] The multifunctional tower is as Figure 4 As shown, the stripping section A uses packing 11, the packing height is 5m, and the lower part 0.5m is used as the washing section C, and the washing liquid inlet 6 is set at the upper end of the washing section. A streamline distributor 8 is set at the flash section B. The lower part of the flash section is equipped with 2 trays, which is used as the stripping section D. Set the material return port 7.

[0049] When the multifunctional column is used in the oxo-synthetic acetic acid unit, the bottom of the multifunctional column obtains the catalyst-containing reaction raffinate part into the reboiler, and the gas-liquid mixture obtained by heating, the gas-liquid mixture is obtained from the reboiler After the top comes out, it enters the lower end of the stripping section of the multifunctional tower from the stream return port 7 to provide stripping steam for the stripping section. Its using method is the same as embodim...

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Abstract

The invention relates to a multifunctional tower used in the process of synthesizing acetic acid by using carbonyl, belonging to the technical field of chemical engineering production equipment. The multifunctional tower is a vertical type tower and comprises lightness removing section and flash evaporation section from the top to bottom; a gas phase outlet is arranged on the top of the tower, a liquid phase outlet is arranged at the bottom of the tower, a back flow hole is arranged on the wall of the tower at the upper part of the lightness removing section, a material inlet lightness removing section arranged on the wall of the tower which is provided with product outlet flash evaporation section on the wall of the lightness removing section is internally provided with a separation component having the functions of separation and purification and a foam destroyer having the function of catching entrainment and liquid drop in the gas phase. The flash evaporation section is provided with a two-phase separation distributor. The multifunctional tower replaces the existing evaporator and lightness removing tower in the acetic acid production equipment and combined the evaporator and the lightness removing tower into a whole, so as to reduce the equipment investment and operating difficulty of technique operation. A streamline distributor is arranged at the flash evaporation section to homogenize the distribution of gas, reduce entrainment, effectively lower the loss of catalyst and reduce the production cost.

Description

technical field [0001] The invention relates to a multifunctional tower used in the process of oxo-synthesizing acetic acid, which belongs to the technical field of chemical production equipment. Background technique [0002] Among the synthetic methods of acetic acid, the carbon monoxide oxo synthesis method is the most commercially valuable. In a reaction liquid medium containing a catalyst (mainly Group VIII metal catalyst such as rhodium or iridium, etc.) and a halogen-containing co-catalyst (such as methyl iodide), carbon monoxide carries out a carbonylation reaction on an alkyl alcohol or a derivative thereof to obtain a carboxylate Acid or its derivatives, especially carbonylation with methanol, gives acetic acid. Its typical production process is as follows: the reaction liquid is drawn from the reactor into the evaporator, and the co-catalyst and other lighter components and product acetic acid in the reaction liquid are evaporated by flash evaporation. The reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/08C07C51/12B01D3/00
Inventor 谢润兴颜庭政唐红萍
Owner BEIJING ZEHUA CHEM ENG
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