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Method for preparing epoxy propane

A technology of propylene oxide and propylene, which is applied in the field of preparing propylene oxide, can solve the problems of high energy consumption, poor continuous production capacity, low selectivity of propylene oxide, etc., achieve good technical effect, and reduce catalyst activity and stability Effect

Active Publication Date: 2014-04-16
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem of low selectivity of propylene oxide, high energy consumption and poor continuous production capacity in the prior art, and a new method for preparing propylene oxide is provided

Method used

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  • Method for preparing epoxy propane

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Embodiment 1

[0021] The following takes four reactors in series as an example to illustrate the operation idea of ​​the method of the present invention.

[0022] in such as figure 1 On the device shown, four fixed-bed reactors are connected in series, and the production scale is 100,000 tons / year.

[0023] Fresh propylene raw material 6 is firstly mixed with methanol solvent 7 in static mixer 32, then fully mixed with fresh hydrogen peroxide raw material 5 through static mixer 31, and then enters reactors 1, 2, 3, and 4 in turn for reaction. Valves 8, 12, 16, 21, 22, 23, and 27 for the switching operation of the reactor are open, and other valves 9, 10, 11, 13, 14, 15, 17, 18, 19, 20, 24, and 25 , 26, 28, 29 are off. After the reaction at the top of reactor 1, the mixture passes through valve 21 in turn, and static mixers 34 and 33 enter reactor 2 from the bottom for reaction. After the reaction at the top of reactor 2, the mixture passes through valve 22 in turn, and static mixers 36 an...

Embodiment 2

[0028] According to the conditions and steps described in Example 1, the production scale is 200,000 tons / year, and the temperatures of the four reactors are respectively 50°C, 45°C, 40°C, and 35°C; the reaction pressure is 2.2MPaG; the weight space velocity of propylene 1.8h -1 ; The molar ratio of methanol / hydrogen peroxide is 8:1; the molar ratio of propylene / hydrogen peroxide is 3:1. The results show that the selectivity of propylene oxide reaches above 97.0%, and the purity of propylene oxide product reaches above 99.95%. Propylene consumption is 149,232.14 tons / year, saving 1,554.50 tons / year of propylene; hydrogen peroxide consumption is 120,806.97 tons / year, saving 1,258.40 tons / year of hydrogen peroxide.

Embodiment 3

[0030] According to the conditions and steps described in Example 1, the production scale is 300,000 tons / year, and the temperatures of the four reactors are respectively 55°C, 50°C, 45°C, and 40°C; the reaction pressure is 2.5MPaG; the weight space velocity of propylene for 3.0h -1; The molar ratio of methanol / hydrogen peroxide is 10:1; the molar ratio of propylene / hydrogen peroxide is 5:1. The results show that the selectivity of propylene oxide reaches above 97.0%, and the purity of propylene oxide product reaches above 99.95%. The consumption of propylene is 223848.20 tons / year, saving 2331.76 tons / year of propylene; the consumption of hydrogen peroxide is 181210.45 tons / year, saving 1887.61 tons / year of hydrogen peroxide.

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Abstract

The invention relates to a method for preparing epoxy propane, which mainly solves the problems of low selectivity of epoxy propane, high energy consumption and poor continuous production capacity in the prior art. According to the method for preparing epoxy propane, provided by the invention, a propylene material is mixed with a methanol solvent, and then mixed with a hydrogen peroxide material, and the obtained mixture enters each reactor of a device comprising n series-wound reactors, and is in contact with a catalyst which comprises a TS-1 type titanium silicalite and positioned in each reactor, so that products containing epoxy propane are produced, and the product flow can selectively enter the follow-up separation work section and / or at least one of the rest reactors, wherein n is equal to or greater than 2; after the catalyst in one of the reactors is inactivated, the reactor can be separated from the device to perform catalyst regeneration operation, and the above problems can be solved better through the technical scheme of catalyst regeneration operation; the method can be used for preparing epoxy propane.

Description

technical field [0001] The present invention relates to a method for preparing propylene oxide. technical background [0002] Propylene oxide is one of the important intermediates of petrochemical products, and is widely used in the production of polyether polyols to prepare polyurethane plastics, as well as the production of unsaturated resins and surfactants. At present, the production technologies of propylene oxide mainly include: chlorohydrin method, propylene oxide / styrene co-production, propylene oxide / tert-butanol co-production, cumene hydrogen peroxide oxidation and other indirect oxidation methods and hydrogen peroxide direct ring Oxidation method and hydrogen peroxide method have the advantages of low investment cost, no obvious by-products, and environmental friendliness compared with other process methods. [0003] EP0323663 relates to an exothermic reaction process in a fixed bed reactor, describes a method for epoxidation of propylene / organic peroxide on a fi...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/12
CPCY02P20/52Y02P20/584C07D303/04C07D301/12
Inventor 杨建平严政徐尔玲何琨
Owner SINOPEC SHANGHAI ENG
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