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Process for producing (meth)acrylic acid or (meth)acrylic ester

A technology for acrylate and acrylic acid, applied in the field of distillation and purification, can solve the problems of deterioration of gas-liquid contact state, reduction of the recovery rate of target products, hindering continuous operation of distillation towers, etc.

Inactive Publication Date: 2006-03-08
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, these solids are caused to adhere, accumulate or accumulate in the tray plate inside the distillation column and the gaps in the packing, which will lead to an increase in the pressure difference between the top and the bottom of the column, and the deterioration of the gas-liquid contact state. clogging etc.
As a result, not only the recovery rate of the target product is reduced, but also there are problems such as preventing the continuous operation of the stable distillation column.

Method used

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  • Process for producing (meth)acrylic acid or (meth)acrylic ester
  • Process for producing (meth)acrylic acid or (meth)acrylic ester
  • Process for producing (meth)acrylic acid or (meth)acrylic ester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Acrylic acid was distilled using a vacuum distillation column with a diameter of 1,000 mm. This vacuum distillation column has a column tank for supplying a raw material liquid for distillation, a column body for passing the vapor of the heated liquid in the column tank, and a condenser for condensing the vapor discharged from the top of the column.

[0089]A reboiler for heating the supplied raw material liquid is installed in the column pot. The above-mentioned tower body is a plate tower. The tower body has a structure in which 30 arbitrary perforated plates can be arranged as trays.

[0090] In this example, a total of 30 corrugated plate-type perforated plates without weirs and flat plate-type perforated plates without weirs were installed as the above-mentioned trays. In this embodiment, the perforated plate group arranged from bottom to top according to the order of four corrugated plate-type non-weir perforated plates and one flat-type non-weir perforated plat...

Embodiment 2

[0105] In this embodiment, as shown in Table 1, the group of porous plates arranged from bottom to top in the order of 3 corrugated plate-type non-weir perforated plates and 2 flat-type non-weir perforated plates is regarded as a group. Six groups of plate groups are arranged in order from bottom to top, and are configured as perforated plates as trays. In addition, as a flat plate type non-weir perforated plate, a flat type non-weir perforated plate having a hole diameter of 30 mm and an opening ratio of 27% was used. Except for this, in this example, the experiment of dehydration distillation was performed similarly to Example 1. In operation, the composition of the raffinate extracted from the bottom of the tower is the same as in Example 1.

[0106] Similar to Example 1, the pressure difference between the top and the bottom of the distillation column was 5.5 kPa, and there was no rise, and the operation could be continued stably. After 3 months, the operation was stoppe...

Embodiment 3

[0111] As shown in Table 1, as the above-mentioned corrugated plate type non-weir porous plate, a corrugated plate type non-weir porous plate having a through hole with a diameter of 25 mm and an opening ratio of 24% is used. The height of the corrugated plate type non-weir perforated plate is 30 mm. As the above-mentioned flat type non-weir perforated plate, a flat type non-weir perforated plate with a hole diameter of 30 mm and a porosity of 24% is used. In addition, The experiment of dehydration distillation was performed similarly to Example 1. In operation, the composition of the raffinate extracted from the bottom of the tower is the same as in Example 1.

[0112] Similar to Example 1, the pressure difference between the top and the bottom of the distillation column was 5.5 kPa, and there was no rise, and the operation could be continued stably. After 3 months, the operation was stopped, and when the distillation column was checked from an open point, no polymer of acry...

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Abstract

In the distillation purification of (meth)acrylic acid or a (meth)acrylic ester, attachment, deposition and accumulation of solid matter are prevented to thereby stably maintain a high recovery rate for (meth)acrylic acid or a (meth)acrylic ester, realizing stable continuous operation of the distillation column for a prolonged period of time. There is provided a method of distillation of a composition containing (meth)acrylic acid or a (meth)acrylic ester by means of a distillation column having multistage trays in its interior, wherein use is made of a distillation column packed with, as trays, corrugated-plate-type non-weir perforated plates each having a corrugated sectional configuration and multiple through-holes and flat-plate-type non-weir perforated plates each constituted of a flat plate having multiple through-holes.

Description

technical field [0001] The present invention relates to a distillation refining method for preparing (meth)acrylic acid or (meth)acrylate. [0002] In addition, in this specification, (meth)acrylic acid is a generic term for acrylic acid and methacrylic acid, and means either one or both of them. And (meth)acrylic acid refers to the general term of (meth)acrylic acid and (meth)acrylic acid ester prepared from these acids and alcohols, and also refers to at least one of them. Background technique [0003] As a known method for producing acrylic acid, there is a method using a catalytic gas-phase oxidation reaction of propylene. In this method of obtaining acrylic acid by oxidation of propylene, there are two processes, one is to separate the oxidation of propylene to acrolein and the second-stage oxidation of acrolein to acrylic acid in different reactors and in different The two-stage oxidation process carried out under certain conditions, and the other process is a proces...

Claims

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Application Information

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IPC IPC(8): C07C57/07C07C51/44C07C67/54C07C69/54B01D3/22B01D3/14C07C57/05
CPCC07C67/54B01D3/225B01D3/22C07C51/44
Inventor 矢田修平金丸高志小川宁之
Owner MITSUBISHI CHEM CORP
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