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Method of purifying propylene oxide

A technology of propylene oxide and epoxidation, applied in directions such as organic chemistry, can solve problems such as removal and reduction of undisclosed impurity methyl formate

Inactive Publication Date: 2009-09-09
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in terms of prior art, there is no disclosure of a specific method for highly removing the impurity methyl formate
The methyl formate in this propylene oxide has the problem that the quality of propylene oxide used as a raw material of various chemical products is remarkably reduced

Method used

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  • Method of purifying propylene oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Propylene oxide obtained by reacting cumene hydroperoxide and propylene in the presence of a titanium-containing silica catalyst was used. Propylene oxide contained 50 wt. ppm of methyl formate as an impurity.

[0051] Propylene oxide is subjected to extractive distillation with n-heptane as extractant. 3.4 parts by weight of n-heptane were used with respect to 1 part by weight of propylene oxide. A tray-type extractive distillation column was used, and the operating conditions were 103° C. at the bottom of the column, 85° C. at the top of the column, and 220 kPa at the top of the column.

[0052] Water is added to the distillate obtained from the top of the extractive distillation tower to perform an oil-water separation operation, and the separated oil layer is reused in the extractive distillation tower, while the separated water layer is removed outside the system. The amount of water added was 0.06 parts by weight. The concentration of methyl formate in the sepa...

Embodiment 2

[0055] Utilize Na 2 CO 3 The pH value of 20 g of the aqueous solution containing 5.3% by weight propylene glycol (PG), 420 wt. ppm methyl formate and a small amount of organic acid was adjusted to 8.2. , 4.6% by weight propylene oxide (PO) n-heptane solution was stirred and mixed at 27°C for 3 minutes, left to stand, and oil-water separation was carried out.

[0056] The amounts of propylene glycol and methyl formate in the oil layer and the water layer after standing separation are shown in Table 1. In addition, the propylene glycol increased by the hydration reaction of propylene oxide was calculated as the loss of propylene oxide.

[0057] Table 1

[0058] Example 2 Example 3 pH value of water layer 8.2 8.8 raw material

Embodiment 3

[0060] Except that the pH value of water was adjusted to 8.8, it carried out by the same method as Example 2. The results are shown in Table 1.

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Abstract

The present invention provides a method for purifying propylene oxide, which is a method for purifying propylene oxide containing methyl formate as an impurity. That is, the propylene oxide used for purification is subjected to extraction with a hydrocarbon having 7 to 10 carbon atoms as an extraction method. In the extractive distillation of the solvent, water is added to the distillate obtained from the top of the extractive distillation column in which the extractive distillation is performed, the oil-water separation operation is performed, and the separated oil layer is reused in the extractive distillation column. The separated water layer is removed to the outside of the system and used as the bottom liquid of the extractive distillation column to obtain propylene oxide with a reduced methyl formate concentration.

Description

technical field [0001] The present invention relates to a method for purifying propylene oxide. More specifically, the present invention relates to a method for purifying propylene oxide, which is a method for purifying propylene oxide in which methyl formate is removed from propylene oxide containing methyl formate as an impurity, and the methyl formate as an impurity is effectively Separation and removal can obtain propylene oxide with a reduced concentration of methyl formate. Background technique [0002] It is well known to obtain propylene oxide by reacting an organic hydroperoxide such as cumene hydroperoxide with propylene in the presence of an epoxidation catalyst. At this time, in addition to the target propylene oxide, oxygen-containing compounds such as water, methanol, acetaldehyde, acetone, and propionaldehyde, and by-products such as hydrocarbons are generated. Therefore, in order to obtain high-purity propylene oxide, a purification step for separating and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/32C07D303/04
Inventor 中山敏男辻纯平奥宪章筱原浩二
Owner SUMITOMO CHEM CO LTD