Oil-water-gas separation system and method for process of preparing propylene from methanol

Abstract

The invention provides an oil-water-gas separation system and method for a process of preparing propylene from methanol. The oil-water-gas separation system comprises a hydrocarbon-water separation unit, an oil-gas separation unit, a process steam production unit and a methanol recovery unit, wherein the hydrocarbon-water separation unit is used for separating material flows of MTP-containing reaction products and dilution steam; the oil-gas separation unit is used for separating water carried in gaseous hydrocarbon and heavy hydrocarbon ingredients obtained through separation by the hydrocarbon-water separation unit; the process steam production unit is used for extracting at least partial condensate water subjected to heavy hydrocarbon ingredient separation, and is also used for treatingthe water subjected to hydrocarbon type ingredient extraction to obtain process steam; the methanol recovery unit is used for treating at least partial condensed water subjected to heavy hydrocarboningredient separation so as to separate contained methanol, DME and light ingredient noncondensable gas. The separation system has the advantages that MTP reaction products, reaction water and the process steam can be completely separated; the long-period stable operation of the device is ensured.

Description

technical field [0001] The invention relates to an oil-water-gas separation technology for products obtained in a methanol-to-propylene process, in particular to an oil-water-gas separation system and method used in a methanol-to-propylene process. Background technique [0002] Propylene is the most important basic organic raw material next to ethylene. With the expansion of its derivative application fields year by year, the demand is increasing day by day. However, due to the depletion of petroleum resources, it is urgent to develop a non-petroleum-based propylene production process. At present, the production of methanol from coal / natural gas has entered large-scale production, and methanol to light olefins (MTO / MTP) has the advantages of wide sources of raw materials and low cost, and is suitable for my country's national conditions of rich coal and poor oil. [0003] The methanol-to-propylene (MTP) process is a chemical reaction of the dimethyl ether / methanol mixture ...

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