A reaction product separation system and quenching system for methanol to propylene

Abstract

The invention provides a reaction product separation system for preparing propylene with methanol and a quenching system of the separation system. The separation system comprises a depropanizing tower, a DME (Di Methyl Ether) removal tower, a C2 separation tower, a C3 separation tower and a dehexanizing tower, wherein a tower top of the depropanizing tower is connected with the DME removal tower; a tower top of the DME removal tower is connected with the deethanizing column; a tower top of the deethanizing column is connected with a CO2 removal tower; a tower top of the CO2 removal tower is connected with a C2 separation tank; and a tank top and a tank bottom of the C2 separation tank are connected with the demethanizing column. The quenching system connects a quenched water outlet of a pre-quenching tower and a quenching tower via a pipeline and divides quenched water into four strands; the first strand enters a steam tower; the second strand enters an oxide extraction tower; the third strand is mixed with tower bottom waste water of the steam tower for discharge as waste water; and the fourth strand serves as circulation quenched water. The invention aims at providing the separation system to simplify a flow and reduce energy consumption.

Description

technical field [0001] The invention relates to a process for producing propylene from methanol, in particular to a reaction product separation system and a quenching system for producing propylene from methanol. Background technique [0002] Ethylene and propylene are one of the chemical products with the largest output in the world. The consumption of propylene is second only to ethylene. The total global production capacity is about 100 million tons, occupying an important position in the national economy. [0003] Cracked propylene accounts for 57% of the world's total propylene production capacity, refinery propylene accounts for 33% of the total propylene production capacity, and propylene produced by other processes accounts for about 10% of the total propylene production capacity. At present, the production methods of propylene in my country are mainly the first two, cracking propylene accounts for about 47%, and refinery propylene accounts for about 53%. However, m...

AI Technical Summary

Problems solved by technology

[0005] In view of the current situation of high investment and high energy consumption of methanol-to-olefins plants that have been put into operation, domestic methanol-to-propylene plants must seek to reduce investment and energy consumption, reduce production costs, and enhance market competitiveness

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