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Method of purifying propylene oxide

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

Inactive Publication Date: 2007-07-25
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Propylene oxide obtained by reacting cumene hydroperoxide with propylene in the presence of a titanium-containing silicon oxide catalyst is used. The propylene oxide contains 50 ppm by weight of methyl formate as an impurity.

[0051] Propylene oxide is supplied to extractive distillation using n-heptane as the 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 tower is used, and the operating conditions are 103°C at the bottom of the tower, 85°C at the top of the tower, and 220kPa at the top of the tower.

[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. On the other hand, the separated water layer is removed outside the system. The amount of water added was 0.06 parts by weight. The concentration of methyl form...

Embodiment 2

[0055] Use Na 2 CO 3 The pH value of 20 g of an aqueous solution containing 5.3% by weight of propylene glycol (PG), 420 ppm by weight of methyl formate and a small amount of organic acid was adjusted to 8.2. In a 150 ml glass flask, the above 20 g of aqueous solution and 30 g of the above-mentioned aqueous solution containing 480 ppm by weight of methyl formate were adjusted , 4.6% by weight of propylene oxide (PO) in n-heptane solution was stirred and mixed for 3 minutes at 27° C., and allowed to stand for oil-water separation.

[0056] The amounts of propylene glycol and methyl formate in the oil layer and the water layer after standing and separation are shown in Table 1. It should be noted that the propylene glycol increased by the hydration reaction of propylene oxide is calculated as the loss of propylene oxide.

[0057] Table 1

[0058] Example 2

Embodiment 3

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

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Abstract

The method for refining propylene oxide containing methyl formate as the impurity comprises the following process: propylene oxide to be refined is subjected to extractive distillation with a 7-10C hydrocarbon as extractant, water is added to a distillate from the overhead of an extractive distillation column for the extractive distillation to carry out an oil / water separatory operation, the resulting oil layer separated is recycled to the extractive distillation column, while the aqueous layer separated is removed out of the system, and the objective propylene oxide with reduced methyl formate concentration is obtained as bottoms in the extractive distillation column.

Description

Technical field [0001] The 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 that removes methyl formate from propylene oxide containing methyl formate as an impurity, and uses methyl formate as an impurity to be effective Ground separation and removal can obtain propylene oxide with a reduced concentration of methyl formate. Background technique [0002] A method for obtaining propylene oxide by reacting an organic hydroperoxide such as cumene hydroperoxide with propylene in the presence of an epoxidation catalyst is well known. At this time, in addition to the target product of propylene oxide, oxygen-containing compounds such as water, methanol, acetaldehyde, acetone, and propionaldehyde or by-products such as hydrocarbons are also generated. Therefore, in order to obtain high-purity propylene oxide, a purification step for sepa...

Claims

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Application Information

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Patent Type & Authority Applications(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