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Method for separating propylene product prepared from alcohol and/or ether and increasing yield of propylene by byproduct

A technology for propylene and products, which is applied in the production of hydrocarbons from oxygen-containing organic compounds, organic chemistry, etc., can solve the problems of utilization of by-products and high energy consumption of equipment, and achieve the advantages of reducing process energy consumption, low energy consumption and improving propylene yield. Effect

Active Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of high energy consumption of the device and the utilization of by-products in the prior art, and a new method for the separation of propylene products from alcohol and / or ether and the use of by-products to increase the production of propylene is provided

Method used

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  • Method for separating propylene product prepared from alcohol and/or ether and increasing yield of propylene by byproduct
  • Method for separating propylene product prepared from alcohol and/or ether and increasing yield of propylene by byproduct

Examples

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Effect test

Embodiment 1

[0033] Using the process of the present invention, taking the 300,000 / year propylene methanol or / and dimethyl ether olefins plant as an example, methanol is converted into propylene in the methanol-to-propylene reactor as the main reaction product, and is passed through the product gas concentration zone S1 Gas phase hydrocarbon stream 1 is obtained after dehydration and acid gas carbon dioxide. The gas phase hydrocarbon stream 1 has a temperature of 43° C. and a pressure of 0.10 MPa. Gas-phase hydrocarbon stream 1 is separated into low-pressure C4 and lighter components 2 and C5 and heavier components 12 in the pre-separation tower T1. The low-pressure C4 and lighter component 2 is pressurized to 1.3MPa by the compressor C1 to obtain the high-pressure C4 and lighter component 3, and then sent to the desorption tower T2. In the desorption tower, 70% mass fraction of the carbon three components is extracted from the bottom of the tower to obtain the feed 5 of the depropanizer,...

Embodiment 2

[0036] Using the process of the present invention, taking the 300,000 / year propylene methanol or / and dimethyl ether olefins plant as an example, methanol is converted into propylene in the methanol to propylene reactor as the main reaction product, and passes through the product gas concentration zone After S1 is dehydrated and acid gas carbon dioxide is obtained gas phase hydrocarbon stream 1. The gas phase hydrocarbon stream 1 has a temperature of 43° C. and a pressure of 0.12 MPa. Gas-phase hydrocarbon stream 1 is separated into low-pressure C4 and lighter components 2 and C5 and heavier components 12 in the pre-separation tower T1. The low-pressure C4 and lighter components 2 are pressurized to 1.6MPa by the compressor C1 to obtain the high-pressure C4 and lighter components 3, and then sent to the desorption tower T2. In the desorption tower, 72% mass fraction of the carbon three components is extracted from the bottom of the tower to obtain the feed 5 of the depropanize...

Embodiment 3

[0039] Using the process of the present invention, taking the 300,000 / year propylene methanol or / and dimethyl ether olefins plant as an example, methanol is converted into propylene in the methanol to propylene reactor as the main reaction product, and passes through the product gas concentration zone After S1 is dehydrated and acid gas carbon dioxide is obtained gas phase hydrocarbon stream 1. The gas phase hydrocarbon stream 1 has a temperature of 43° C. and a pressure of 0.14 MPa. Gas-phase hydrocarbon stream 1 is separated into low-pressure C4 and lighter components 2 and C5 and heavier components 12 in the pre-separation tower T1. The low-pressure C4 and lighter components 2 are pressurized to 1.8MPa by the compressor C1 to obtain the high-pressure C4 and lighter components 3, and then sent to the desorption tower T2. In the desorption tower, 73% mass fraction of the carbon three components is extracted from the bottom of the tower to obtain the feed 5 of the depropanize...

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Abstract

The invention relates to a method for separating a propylene product prepared from alcohol and / or ether and increasing yield of propylene by a byproduct and aims to solve the problem of high energy consumption and the problem about byproduct use in a process for preparing the propylene from the alcohol and / or ether in the prior art. The method comprises the following steps: the alcohol and / or ether are / is converted into propylene in a reactor, the propylene is the main reaction product, and a mixed hydrocarbon product is obtained after reaction products are concentrated in a product gas concentration region; the mixed hydrocarbon product is fed into a pre-separation tower for removal of C5 and heavier components, and C4 and lighter components are obtained; C4 and the lighter components are boosted, fed into an absorption and desorption system and are separated into absorption tail gas, a C3 component and a C4 component; at least part of the absorption tail gas returns to the reactor for preparing the propylene from the alcohol and / or ether, and at least part of the C4 component returns to the reactor for preparing the propylene from the alcohol and / or ether. With adoption of the technical scheme for increasing the yield of the propylene, the problems are better solved, and the method can be applied to industrial production of the propylene prepared from the alcohol and / or ether.

Description

technical field [0001] The invention relates to a method for separating propylene products from alcohol and / or ether and utilizing by-products to increase propylene production. [0002] technical background [0003] Ethylene and propylene are basic organic chemical raw materials in great demand. Due to the increase in demand for ethylene and propylene derivatives such as ethylene oxide, polyethylene, polypropylene, acrylonitrile, cumene, and propylene oxide, the corresponding ethylene , The demand for propylene is also growing rapidly. Traditional ethylene and propylene mainly come from petroleum processing. With the increasing scarcity of petroleum resources, the development of technologies for preparing ethylene and propylene from non-petroleum resources such as coal or natural gas has attracted more and more attention at home and abroad. The production of ethylene and propylene from coal usually adopts the process route of coal-to-synthesis gas, synthesis gas to methanol,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C1/20
Inventor 胡帅金鑫杨卫胜
Owner CHINA PETROLEUM & CHEM CORP