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Method of comprehensively utilizing byproduct gasoline by methanol-to-propylene device

A methanol-to-propylene and by-product technology, applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of high energy consumption, low comprehensive utilization rate of MTP by-product gasoline, high engineering investment, etc., and achieve separation efficiency High efficiency, low consumption of public works, low investment in equipment engineering

Active Publication Date: 2017-07-14
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that in the prior art, the comprehensive utilization rate of MTP by-product gasoline is low, the project investment is high, and the energy consumption is high, and a new method for comprehensive utilization of by-product gasoline in a methanol-to-propylene plant is provided

Method used

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  • Method of comprehensively utilizing byproduct gasoline by methanol-to-propylene device

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Embodiment 1

[0026] Process flow block diagram of the present invention is as figure 1 shown. MTP by-product gasoline is processed through gasoline hydrogenation (1), aromatics extraction (2), pressure swing adsorption separation (3) and moving bed adsorption separation (4) to obtain normal paraffins (9) and isoparaffins ( 10), raffinate aromatics (11), p-xylene (12) and other basic organic chemical raw materials.

[0027] Taking the methanol-to-propylene MTP plant with a production capacity of 1.8 million tons / year as an example, the by-product is 159,500 tons / year of gasoline, and its composition ratio is as follows:

[0028] component name n-alkanes Isoparaffin monoolefin diene p-xylene Aromatics Subtotal Content (wt%) 44.52 29.72 0.75 14.98 10.03 100.00

[0029] 1) Firstly, gasoline hydrogenation technology is adopted, through the MTP by-product gasoline pretreatment system, one-stage hydrogenation system, two-stage hydrogenation system, and hydro...

Embodiment 2

[0037] According to the conditions and steps described in Example 1, but the production capacity is expanded to 3.6 million tons / year methanol-to-propylene MTP unit, the by-product is 319,000 tons / year gasoline, using gasoline hydrogenation, aromatics extraction, and pressure change of the present invention Adsorption separation and moving bed adsorption separation technical schemes are processed to obtain:

[0038] component name n-alkanes Isoparaffin p-xylene Aromatics total Output (10,000 tons / year) 14.34 9.58 4.78 3.20 31.90

[0039] The product yield is 99.3%, the product purity is 98.2%, the project investment is reduced by 10.4%, and the comprehensive energy consumption is reduced by 5.3%.

Embodiment 3

[0041] According to the conditions and steps described in Example 1, the production capacity is still 1.8 million tons / year of the methanol-to-propylene MTP plant as an example, and the by-product is 160,700 tons / year of gasoline, but the composition ratio changes as follows:

[0042] component name n-alkanes Isoparaffin monoolefin diene p-xylene Aromatics Subtotal Content (wt%) 40.64 32.23 0.51 17.87 8.75 100.00

[0043] Firstly, the gasoline hydrogenation technology is adopted, and the nickel-based hydrogenation catalyst containing 16% nickel oxide is used as the carrier. The reaction gauge pressure of the hydrogenation reactor is 2.2MPa, the inlet temperature is 60°C, and the liquid volume space velocity is 2.2h -1 , The volume ratio of hydrogen to oil is 150. Secondly, the aromatics extraction technology is adopted. The operating gauge pressure of the extractive distillation tower is 0.10MPa, the operating temperature of the tower top i...

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Abstract

The invention relates to a method of comprehensively utilizing a byproduct gasoline by a methanol-to-propylene device and mainly solves the problem that in the prior art, MTP byproduct gasoline is low in comprehensive utilization ratio, the project investment is relatively high and the energy consumption is relatively high. By means of the method of comprehensively utilizing the byproduct gasoline by the methanol-to-propylene device, the MTP byproduct gasoline firstly passes through a gasoline hydrogenation unit to obtain hydrogenated gasoline, then the hydrogenated gasoline enters an aromatic hydrocarbon extraction unit, non-aromatic hydrocarbon raffinate oil enters a pressure swing adsorption unit to obtain n-alkanes and isoparaffin, and the aromatic hydrocarbon obtained by the aromatic hydrocarbon extraction unit enters a mobile bed adsorption separation unit to obtain raffinate aromatic hydrocarbon and paraxylene, so that the above problems are solved well, and the method can be used in the methanol-to-propylene device.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of by-product gasoline in a methanol-to-propylene plant. Background technique [0002] Propylene is the second largest petrochemical base material after ethylene, and its largest use is to produce polypropylene. At present, more than 95% of propylene comes from the by-products of ethylene produced by steam thermal cracking units of petrochemical plants and the by-products of FCC units of oil refineries. The source of coal is greatly restricted, and the development of methanol to propylene (MTP) process is not only conducive to the efficient utilization of coal, but also can ease the tense situation of domestic propylene supply. [0003] In addition to the production of propylene products, the MTP process also produces a small amount of liquefied gas and a large amount of liquid hydrocarbons by-product. The liquid hydrocarbons produced by the MTP process, that is, the by-product gasoline ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00
CPCC10G67/00
Inventor 吴德荣何琨白玫李真泽张斌
Owner SINOPEC SHANGHAI ENG
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