System and method for recycling byproducts generated in preparation of propene from methanol

Abstract

The invention discloses a system for recycling byproducts generated in preparation of propene from methanol. The system comprises a first reactor, a second reactor, a product separation unit, a C4 processing device, a mixed aromatic hydrocarbon processing device, a C5 / C6 processing device and a heating furnace, wherein the first reactor is used for performing a reaction for preparing dimethyl ether from the methanol to obtain a first product flow; the second reactor is used for synthesizing the propene to obtain a second product flow; the product separation unit is used for separating the second product flow to obtain a target product and first, second, third and fourth byproducts; the C4 processing device is used for receiving the second byproduct and separating a liquefied gas component to obtain a first circulating product flow; the mixed aromatic hydrocarbon processing device is used for separating the fourth byproduct to obtain first, second, third and fourth products of the mixed aromatic hydrocarbon processing device; the C5 / C6 processing device is used for separating the third byproduct from the second product of the mixed aromatic hydrocarbon processing device to obtain first, second and third products of the C5 / C6 processing device; and the heating furnace is used for receiving and heating the first product flow, the first byproduct, the first circulating product flow and the second product of the C5 / C6 processing device. The invention also provides a method employing the system. According to the system and the method, the byproducts generated in preparation of the propene from the methanol can be recycled.

Description

technical field [0001] The invention belongs to the field of methanol to propylene, in particular to a system and method for recycling by-products of methanol to propylene. Background technique [0002] As one of the important basic chemical raw materials in the chemical industry, propylene is widely used in the production of polypropylene (about 52%), acrylonitrile (about 12%), propylene oxide (about 7%), cumene (about 7%), isopropanol (about 4%), carbonyl alcohols (about 9%) and other chemicals (about 9%). In October 2010, the world's first 500,000-ton / year methanol-to-propylene industrial plant realized industrial application in Shenhua Ningxia Coal Industry Group. The technology adopts the two-stage process of German Lurgi Company (Lurgi), the raw material is dimethyl ether / methanol, and the hydrocarbon by-products include ethylene, mixed carbon 4, carbon 5 / carbon 6 and carbon 7 and above mixed hydrocarbons; among them, ethylene, Mixed C4, C5 / C6 are used as circulating...

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Problems solved by technology

In this regard, there have been related reports in China, such as Chinese patents CN 103086836 A, CN 103508832 B, CN 103864563 B, CN 103864564 B, CN102190545 A, etc., all disclose the use of certain by-products in the process of methanol to olefins to process and prepare higher value-added products, but none of them involve how to comprehensively utilize various hydrocarbon by-products to produce high value-added chemicals and products, let alone related devices or systems

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