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MTO (methanol toolefin) and steam crackingto olefin mixed separation technology

A methanol-to-olefins and olefins-to-olefins technology, applied in distillation purification/separation, hydrocarbon purification/separation, hydrocarbon cracking to hydrocarbons, etc., can solve the problems of high cost of olefins and high energy consumption

Inactive Publication Date: 2014-08-06
WISON ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the current situation of high cost and high energy consumption of steam cracking of naphtha or other hydrocarbon raw materials to produce olefins, domestic ethylene plants must seek multiple raw materials and reduce production costs to enhance market competitiveness

Method used

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  • MTO (methanol toolefin) and steam crackingto olefin mixed separation technology
  • MTO (methanol toolefin) and steam crackingto olefin mixed separation technology
  • MTO (methanol toolefin) and steam crackingto olefin mixed separation technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] process flow figure 1 process shown. The main equipment includes cracking furnace 21; quenching oil tower 11; quenching water tower 12; compressor one stage and compressor two stage 31; washing tower 32; alkali washing tower 33; compressor three stages, compressor four stages or compressor five stages and Separation system 40; methanol to olefins reactor 22; quenching tower 13; water washing tower 14; catalyst-containing sewage treatment equipment 16; oxide stripping tower 15; figure 2 The main equipment includes depropanizer 41; pre-cut tower and oil absorption tower 42; deethanizer 43; ethylene tower 44; propylene tower 45; image 3 The main equipment includes demethanizer 51; deethanizer 52; ethylene tower 53; depropanizer 54; propylene tower 55; Figure 4 The main equipment includes deethanizer 61; demethanizer 62; ethylene tower 63; depropanizer 64; propylene tower 65 and various pipelines.

[0025] The process flow is as follows:

[0026] Gasified or preheate...

Embodiment 2

[0031] The methanol-to-olefins reaction gas passes through the quenching tower 13, and then the stream 133 directly goes to the quenching water tower 12, mixes with the reaction gas from hydrocarbon thermal cracking to produce olefins, and then enters the quenching water tower 12, and then goes to the first stage of the compressor, the second stage of the compressor 31, and the washing tower 32, The alkali washing tower 33 and the separation system 40 can cancel the water washing tower 14 in the methanol-to-olefins process.

Embodiment 3

[0033] If the reaction pressure of methanol to olefins is relatively high, the methanol to olefins reaction gas passes through the water washing tower 14, and the stream 141 can directly go to the second stage of the compressor before mixing with the reaction gas of hydrocarbon thermal cracking to olefins, enter the second stage of the compressor, and then go to the second stage of the compressor for washing Tower 32 , alkali washing tower 33 , three-stage compressor, four-stage compressor or five-stage compressor and separation system 40 .

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Abstract

The invention relates to an MTO (methanol toolefin) and steam crackingto olefin mixed separation technology. Thetechnology comprises an MTOtechnology and a steam cracking toolefin technology. Thetechnology is characterized in that reaction gases produced by an MTO reaction are subjected to cooling and oxide recovery, then are mixed with reaction gases produced by a steam cracking reaction and enter a same separation system forhydrocarbon separation. Compared with the prior art, the technology has the advantages that products of both the MTO reaction and the steam crackingto olefin reaction are mixed at a proper mixing point and then enter same separation procedures, the problem of recovery of oxides in the MTO reaction gases is solved, and different separation procedures are selected according to composition of the reaction gases after mixing. The MTO substitutes for partial or all capacity of thermal crackingto olefin, meanwhile, equipment of an original steam cracking device is used to the maximum extent, and the technology is a feasible method for broadening sources of raw materials of existing steam-crackingethylene devices and reducing high production costs of the existing ethylene devices.

Description

technical field [0001] The present invention relates to the methanol-to-olefins process and the steam-cracking-to-olefins process, especially to the transformation of the steam cracking process or the mixing of the two processes. Background technique [0002] Ethylene and propylene are one of the largest chemical products in the world, and the ethylene industry is the core of the petrochemical industry. Ethylene products account for more than 70% of petrochemical products and occupy an important position in the national economy. [0003] Ethylene raw material is an important factor affecting ethylene cost. In ethylene production, raw materials account for as high as 70% to 75% of the total cost. At present, the world's ethylene raw materials mainly include ethane, propane, butane, LPG, condensate oil, naphtha, hydrocracking tail oil and gas oil. Among them, more than 50% of ethylene raw materials come from petroleum, such as naphtha, diesel oil and condensate oil, etc.; mo...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C4/04C07C4/06C07C7/00C07C7/04C07C11/04C07C11/06C07C9/06C07C9/08
CPCY02P30/20Y02P30/40
Inventor 李围潮杨勇张旭之李保有王泽尧王洲晖李生斌李秀芝
Owner WISON ENG
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