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Refining method of propylene oxide

A technology of propylene oxide and refining method, applied in the direction of organic chemistry, etc., can solve the problem of low yield of propylene oxide, achieve the effect of reducing energy consumption, reducing losses, and simplifying the refining process

Active Publication Date: 2017-03-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problem of low yield of propylene oxide in the prior art, and provides a new method for refining propylene oxide

Method used

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  • Refining method of propylene oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0032] use figure 1 As shown in the process flow, the reaction product from the propylene oxide reactor enters the propylene separation tower, and the overhead product propylene, propane, propylene oxide, acetone, and aldehydes (containing acetaldehyde and propionaldehyde) are separated, and the bottom material contains ethylbenzene , cumene, α-methylstyrene, acetophenone, α, α-dimethylbenzyl alcohol, phenol and high-boiling point by-products; the top material of the propylene separation tower enters the propylene stripper, and the top of the stripper The gas contains propylene, propane, and a small amount of propylene oxide. This material enters the propylene oxide adsorption tower to contact with the absorbent to remove propylene oxide, and then returns to the reaction system for recycling after being compressed; the bottom material of the stripping tower contains epoxy Propane and acetone, this material enters the propylene oxide refining tower, the tower is filled with ads...

Embodiment 2

[0043] Same as [Example 1], except that the pressure of the propylene separation tower is 0.1 MPa, the number of theoretical plates is 30, the reflux ratio is 0.1, the temperature at the top of the tower is 35° C., and the temperature at the bottom of the tower is 70° C.

[0044] In terms of weight percentage, the top material of the propylene separation tower contains 65% propylene, 3% propane, 30% propylene oxide, 1.5% acetone, and 0.5% aldehydes; the bottom material contains 0.5% ethylbenzene, 35% isopropyl Benzene, 2% α-methylstyrene, 3.5% acetophenone, 55% α,α-dimethylbenzyl alcohol, 3% phenol, 1% high boiling point by-products.

[0045] The pressure of the propylene stripping tower is 0.2MPa, and the temperature of the bottom of the tower is 70°C.

[0046] In terms of weight percentage, the top material of the propylene stripping tower contains 98% propylene, 0.9% propane and 1.1% propylene oxide; the bottom material contains 96% propylene oxide, 2.5% acetone and 1.5% al...

Embodiment 3

[0052] Same as [Example 1], except that the pressure of the propylene separation tower is 0.2 MPa, the number of theoretical plates is 40, the reflux ratio is 0.4, the temperature at the top of the tower is 40° C., and the temperature at the bottom of the tower is 75° C.

[0053] In terms of weight percentage, the top material of the propylene separation tower contains 70% propylene, 0.5% propane, 28% propylene oxide, 1% acetone, and 0.5% aldehydes; the bottom material contains 0.2% ethylbenzene, 30% isopropyl Benzene, 2% α-methylstyrene, 1% acetophenone, 65% α,α-dimethylbenzyl alcohol, 0.8% phenol, 1% high boiling point by-products.

[0054] The pressure of the propylene stripping tower is 0.3MPa, and the temperature of the bottom of the tower is 75°C.

[0055] In terms of weight percentage, the top material of the propylene stripping tower contains 99% propylene, 0.9% propane and 0.1% propylene oxide; the bottom material of the tower contains 97% propylene oxide, 2% acetone ...

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Abstract

The invention relates to a refining method of propylene oxide, and mainly solves the problem of low yield of propylene oxide in the prior art. The refining method comprises the following steps: (a) introducing a reaction product from an epoxidation reactor into a propylene separation tower, obtaining a first material flow from the tower top, and obtaining a second material flow from the tower bottom; (b) introducing the first material flow into a propylene stripping tower, obtaining a third material flow from the tower top, and obtaining a fourth material flow from the tower bottom; (c) introducing the third material flow into a propylene oxide absorption tower, contacting the third material flow with an absorber in a countercurrent contact mode, obtaining a fifth material flow from the tower top, obtaining a sixth material flow from the tower bottom, and returning the sixth material flow to the first separation tower; and (d) introducing the fourth material flow into a propylene oxide refining tower, fully contacting the fourth material flow with an adsorber filled in the propylene oxide refining tower, and obtaining the product namely propylene oxide from the tower top. The provided refining method well solves the abovementioned problem and can be used to refine propylene oxide in industrial production.

Description

technical field [0001] The invention relates to a method for refining propylene oxide. Background technique [0002] Propylene oxide is an important basic chemical raw material, and it is the third largest organic chemical product in the output of propylene derivatives after polypropylene and acrylonitrile. It is mainly used in the production of polyether, propylene glycol, propylene glycol ether, etc. It is also an important raw material for non-ionic surfactants, oil field demulsifiers, and pesticide emulsifiers. Propylene oxide derivatives are also widely used in industries such as food, tobacco, pesticides and cosmetics. Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products. [0003] Propylene oxide production processes mainly include chlorohydrin method, co-oxidation method and direct oxidation method. The main problem of the chlorohydrin method is that the equipment is severely corroded, and a large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/32C07D303/04
CPCC07D301/32C07D303/04
Inventor 杨洪云高焕新金国杰黄政丁琳康陈军
Owner CHINA PETROLEUM & CHEM CORP
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