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Purification method of propylene oxide

A technology of propylene oxide and purification methods, applied in the direction of organic chemistry, etc., can solve the problems of accumulation of impurities, disadvantages, and improve product quality

Active Publication Date: 2018-04-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above method extractant hydrocarbons circulate in a closed circuit in the system, and impurities accumulate in the system, which is not conducive to improving product quality.

Method used

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  • Purification method of propylene oxide
  • Purification method of propylene oxide
  • Purification method of propylene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The method flow is as follows figure 1 As shown, it contains water, acetaldehyde, propionaldehyde, methanol and other oxygenates, propylene and other C 3 ~C 4 Light hydrocarbons, 2-methylpentane, etc. C 5 ~C 6 The crude propylene oxide (stream 1) of hydrocarbon impurity, flow rate is 10t / h, and the extraction agent propylene glycol (stream 2) that reclaims heat exchange to 70 ℃, after heat exchange, crude propylene oxide (stream 4) from 100 towers Feed from the lower part, the temperature of the extractant propylene glycol (stream 3) after heat exchange is about 150 °C, feed from the upper part of the tower, extract and rectify to remove water, propionaldehyde, acetone, 3-methyl contained in the crude propylene oxide Pentane and other impurities. The composition and content of crude propylene oxide (stream 1) are shown in Table 3:

[0049] table 3

[0050] composition

Content, wt

Propylene oxide

0.99

Propionaldehyde

1200ppm ...

Embodiment 2

[0061] The method flow is as follows figure 1 As shown, it contains water, acetaldehyde, propionaldehyde, methanol and other oxygenates, propylene and other C 3 ~C 4 Light hydrocarbons, 2-methylpentane, etc. C 5 ~C 6 The crude propylene oxide (stream 1) of hydrocarbon impurity, flow rate is 10t / h, and the extraction agent propylene glycol (stream 2) that reclaims heat exchange to 80 ℃, after heat exchange, crude propylene oxide (stream 4) from 100 towers Feed from the lower part, the temperature of the extractant propylene glycol (stream 3) after heat exchange is about 160 ° C, feed from the upper part of the tower, extract and rectify to remove water, propionaldehyde, acetone, 3-methyl contained in the crude propylene oxide Pentane and other impurities. The composition and content of crude propylene oxide (stream 1) are shown in Table 4:

[0062] Table 4

[0063] composition

Content, wt

Propylene oxide

0.985

Propionaldehyde

2100ppm ...

Embodiment 3

[0073] The method flow is as follows figure 2Shown, 400 tower still liquids are divided into 3 parts, and stream I (10%) directly circulates to ethylbenzene peroxidation unit as reaction raw material, stream II (30%) goes to 500 towers, and stream III (60%) goes to 300 towers as Extractant, stream IV is supplementary fresh ethylbenzene, and the flow rate is the same as stream I.

[0074] All the other implementations are the same as in Example 1, and the energy consumption is nearly 60% lower than that of the 500 towers in Example 1.

[0075] Propylene oxide content ≥ 99.9wt% in logistics 15, total aldehyde (calculated as propionaldehyde+acetaldehyde) 5mg / kg, hydrocarbon impurity is lower than 10ppm, impurity content such as acetone, water is negligible, and propylene oxide recovery rate reaches 99.5%.

[0076] As can be seen from the above, the implementation of the present invention can separate and obtain the polymer grade propylene oxide qualified product in an economic...

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Abstract

The present invention provides a kind of purification method of propylene oxide (PO), and this method is the purification method of EBHP (ethylbenzene hydrogen peroxide) method propylene oxide crude product, at first adopts C2~C6 alkyl glycol to make in deweighting tower The extractant removes impurities such as water, propionaldehyde, acetone, methanol, etc., and the kettle liquid enters the extractant recovery tower to recover the extractant and circulates to the upper part of the weight removal tower to feed, and the overhead distillate of the weight removal tower removes C3~ C4 light hydrocarbons, most of acetaldehyde and other impurities, the liquid in the delighting tower enters the extraction tower and uses C7-C20 hydrocarbons as the extraction agent to remove residual acetaldehyde, methanol, water and other impurities, the liquid in the extraction tower enters the product tower, and the product The tower uses C7-C20 hydrocarbons as the extraction agent to remove C5-C6 light hydrocarbons, and the propylene oxide product is obtained at the top of the tower, and the product tower liquid enters the solvent stripping tower to recover the extraction agent C7-C20 hydrocarbons, which can be used for propylene oxide ( Industrial application of PO) purification.

Description

technical field [0001] The present invention relates to the purification method of propylene oxide, in more detail, the present invention mainly relates to the purification method of EBHP (ethylbenzene hydrogen peroxide) legal system propylene oxide, this method is to contain water, acetaldehyde, propionaldehyde, methyl alcohol etc. Oxygenated compounds, propylene, etc. C 3 ~C 4 Light hydrocarbons, 2-methylpentane, etc. C 5 ~C 6 A method for refining crude propylene oxide of hydrocarbon impurities, a purification method that combines multiple rectification of the above crude propylene oxide solution with extractive distillation to obtain a qualified product of polymer grade propylene oxide. Background technique [0002] Propylene oxide is an important organic compound raw material, the third largest propylene derivative after polypropylene and acrylonitrile, mainly used in the production of polyether polyols, propylene glycol and various nonionic surfactants, among which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/32
Inventor 胡松杨卫胜
Owner CHINA PETROLEUM & CHEM CORP
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