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Method and system for dealdehyding and upgrading epoxypropane

A kind of propylene oxide, upgrading technology

Pending Publication Date: 2021-07-06
南京佳华科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy consumption of the whole dealdehyde process is extremely high, the output is low, the quality of the final propylene oxide is not high, and the investment cost of equipment is high

Method used

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  • Method and system for dealdehyding and upgrading epoxypropane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 Shown, a kind of system of propylene oxide dealdehyde upgrading, comprises reactor 1, membrane separator 2, rectifying tower 3, defective product tank 7 and dehydration tower 8; The outlet of described reactor 1 It is connected with the inlet of membrane separator 2, and the permeation side outlet of said membrane separator 2 is connected with the inlet of rectification tower 3, and the bottom of rectification tower 3 is equipped with reboiler 6, and the outlet of rectification tower 3 tower kettle is The feed port is connected with the unqualified product tank 7, the rectifying tower 4 top discharge port or the side line discharge port is connected with the condenser 4, the discharge port of the condenser 4 is connected with the reflux tank 5, and the discharge port of the reflux tank 5 They are respectively connected to the reflux port of the rectification tower 3 and the feed port of the dehydration tower 8.

[0039]The reactor 1 is a reactor. The ...

Embodiment 2

[0047] On the basis of the system for removing and upgrading propylene oxide described in Example 1, the outlet of the reactor 1 is directly connected to the inlet of the rectifying tower 3 .

[0048] The method for the dealdehydeization and upgrading of propylene oxide based on the system of the present embodiment comprises the following steps:

[0049] Step (1), put 1000g of a certain propylene oxide crude product (wherein the acetaldehyde content is 0.128%wt, the propionaldehyde content is 0.481%wt, the water content is 0.18%wt), 40g of sodium hypochlorite solution (10%wt) into the reaction kettle, open Stir to make the materials mix evenly, pour nitrogen into the kettle until the pressure in the kettle is 0.2MPa, heat to 70°C and keep for 0.5 hours to end the reaction;

[0050] Step (2), the material obtained in step (1) is sent to a rectification tower (the number of theoretical plates is 15, and the feed position is at the 6th plate), the operating pressure of the rectif...

Embodiment 3

[0053] On the basis of the system of propylene oxide dealdehydedization and upgrading described in embodiment 1, adjust reactor 1 to be a fixed bed, fill 30g loading capacity in the fixed bed and be 8%Ni / activated carbon catalyst; The discharge of reactor 1 The port is directly connected with the inlet of the rectification tower 3; the dehydration tower 8 is filled with activated alumina.

[0054] The method for the dealdehydeization and upgrading of propylene oxide based on the system of the present embodiment comprises the following steps:

[0055] Step (1), feed hydrogen into the fixed bed, adjust the back pressure valve to control the pressure of the fixed bed to 1.5MPa, heat to 90°C, inject crude propylene oxide (wherein the content of acetaldehyde is 0.083%wt, the content of propionaldehyde is 0.514 %wt, water content 0.38%wt), control space velocity is 4h -1 , the hydrogen-thane ratio is 500:1;

[0056] Step (2), the material obtained in step (1) is sent to a rectific...

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Abstract

The invention discloses a method for dealdehyding and upgrading epoxypropane, which comprises the following steps of: (1) under the action of an oxidizing agent, carrying out oxidation reaction on an aldehyde compound of an epoxypropane crude product; or under the action of a hydrogenation catalyst, carrying out hydrogenation reduction reaction on the aldehyde compound of the epoxypropane crude product and hydrogen; and (2) feeding the material obtained by the reaction in the step (1) to a rectification tower for rectification treatment to obtain a low-aldehyde-value epoxypropane product. The method also comprises the following step of: feeding a material obtained by reaction in the step (1) into a membrane separator for membrane separation, and feeding a product on the permeation side of the membrane separator into a rectification tower for rectification treatment. The aldehyde in the epoxypropane crude product is subjected to oxidation or reduction reaction, the boiling point of the impurity obtained by the reaction is greatly different from that of epoxypropane, and a superior product can be obtained through rectification. Compared with direct rectification, the method has the advantages that the reflux ratio is reduced, and the number of tower plates is reduced.

Description

technical field [0001] The invention belongs to the chemical product production industry, specifically the field of propylene oxide production, and relates to a method and system for dealdehydeizing and upgrading propylene oxide, in particular to a production method and system for high-purity and low-aldehyde value propylene oxide. Background technique [0002] Propylene oxide (Propylene oxide), also known as propylene oxide and methyl oxirane, is a very important organic compound raw material and the third largest propylene derivative after polypropylene and acrylonitrile. Propylene oxide is mainly used in the production of polyether polyols, propylene glycol and various nonionic surfactants, among which polyether polyols are important raw materials for the production of polyurethane foams, insulation materials, elastomers, adhesives and coatings, etc. Ionic surfactants are widely used in petroleum, chemical, pesticide, textile, daily chemical and other industries. At the ...

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 张扬谢佳华赵怡刘琼高云山王健贾涛刘应庆
Owner 南京佳华科技股份有限公司
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