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Method and system for separating MTP (Methanol to Propylene) reaction mixed gas

A separation method and mixed gas technology, applied in the purification/separation of hydrocarbons, chemical instruments and methods, hydrocarbons, etc., can solve the problems of restricting the development of MTP process, complicated system operation, high investment cost, etc., and reduce the energy consumption of the device and equipment investment, simplification of subsequent processes, and high separation efficiency

Active Publication Date: 2013-07-31
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the existing MTP reaction mixed gas separation method and system are complex in operation, serious in pipeline corrosion, high in energy consumption, and high in investment costs, which limit the development of the MTP process.

Method used

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  • Method and system for separating MTP (Methanol to Propylene) reaction mixed gas

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Embodiment 1

[0031] Embodiment 1: as figure 1 Shown, a kind of MTP reaction mixed gas separation method of the present invention comprises (1) the step of quenching the mixed gas; (2) the step of compressing the mixed gas; (3) the step of refining the mixed gas.

[0032]The reaction mixture gas obtained from the MTP reactor is about 190°C, first enters the pre-quench tower and is washed with pre-quench water, then enters the quench tower after the temperature drops to about 50°C, cools to about 40°C, and then is sent to the compression unit for compression. Part of the process water obtained at the bottom of the pre-quenching tower is used to supplement the process water at the top of the quenching tower after heat recovery, and the other part is returned to the pre-quenching tower, and the rest of the process water is sent to the methanol recovery tower. Part of the process water obtained at the bottom of the quenching tower is passed through After cooling, it returns to the quench tower,...

Embodiment 2

[0040] Embodiment 2: as figure 1 Shown, a kind of MTP reaction mixed gas separation system of the present invention comprises pre-quick cooling tower 1, quick cooling tower 2, process steam tower 4, compressor, depropanizer 5, debutanizer 16, condensate stripping tower 10, The compressor is provided with compression I to IV sections 19, 20, 21, 22, and the water outlet of the quench tower 1 is communicated with the liquid inlet at the top of the quench tower 1, and the water outlet of the quench tower 1 is also connected in series with the first condenser 27, Process water stripper 3, ion exchanger 28 and process steam tower 4, pre-quick cooling tower 1 water outlet and methanol recovery tower 23 water inlets, pre-quick cooling tower 1 top water inlet and quench tower 2 top water inlets communicate; The stripper 10 is located between the compression sections, the liquid hydrocarbon outlet of the separation tank 24 between the compressor I and II sections, the liquid hydrocarbo...

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Abstract

The invention relates to a method and a system for separating MTP (Methanol to Propylene) reaction mixed gas, wherein quenched water of a pre-quenching tower and a quenching tower kettle is respectively treated; gas hydrocarbon obtained at a compression II section is water-washed and alkali-washed and then enters a compression III section; the gas hydrocarbon obtained at the compression III section and liquid hydrocarbon not containing heavy hydrocarbons of C6 and more are respectively dried by the gas hydrocarbon, are flocculated by the liquid hydrocarbon and are dried, and then are conveyedinto a depropanization tower; a condensate stripping tower is arranged between the compression sections and is used for separating the condensate between the compression sections; light hydrocarbon components are returned back to the outlet of the compression II section and a heavy hydrocarbon components are respectively conveyed to a debutanization tower to be refined; the depropanization tower is arranged between the compression III section and a compression IV section and utilizes a regular rectification; the tower top of a demethanation tower is provided with a differential condenser for recycling refrigeration capacity thereof and reducing the loss rate of ethylene. The method and the system provided by the invention can effectively optimize technical flows, reduce system power consumption, reduce pipe corrosion and reduce investment cost.

Description

technical field [0001] The invention relates to the fields of coal chemical industry, natural gas chemical industry and the like, and in particular to a method and system for separating MTP reaction products. Background technique [0002] Propylene is an important organic petrochemical basic raw material, used for the production of polypropylene, phenol, acetone, butanol, octanol, acrylonitrile, propylene oxide, propylene glycol, epichlorohydrin, synthetic glycerin, acrylic acid and isopropanol, etc. Applications also include alkylated oil, high-octane gasoline blending materials, etc. After 1968, due to the increase in the demand for propylene derivatives, especially the sharp increase in the demand for propylene polymers and copolymers, the demand for propylene continued to grow. The current propylene products mainly come from petroleum distillation and cracking. [0003] But oil reserves are limited, and it is a non-renewable resource. The high crude oil price is undou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C1/20C07C7/00
CPCY02P20/10Y02P20/50Y02P30/20Y02P30/40
Inventor 王勇黄文汪永宗曹新波李玉鑫王峰吉京华陈四仿曹媛维赵江丽石海涛
Owner BC P INC CHINA NAT PETROLEUM CORP
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