Technology for preparing propylene by utilizing by-products in refinery

A by-product, propylene technology, applied in the field of propylene production, can solve the problems of low propylene yield and low added value of chemical utilization, and achieve the effects of high propylene yield, increased chemical added value, and good technical effects

Inactive Publication Date: 2011-05-25
王伟跃
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to produce propylene by preferably the mixture of mixed carbon four and dry gas by refinery by-product, and the technical problem to be solved is that the chemical industry utilization added value of refinery by-product such as mixed carbon four and dry gas is low and To solve the problem of low propylene yield, provide a new process for producing propylene from a mixture of refinery by-products such as mixed carbon four and dry gas

Method used

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  • Technology for preparing propylene by utilizing by-products in refinery
  • Technology for preparing propylene by utilizing by-products in refinery
  • Technology for preparing propylene by utilizing by-products in refinery

Examples

Experimental program
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Effect test

Embodiment 1

[0042] according to figure 1 As shown, the composition (% by weight) of the refinery mixed C4 is: isobutane: 40, n-butane: 10, n-butene: 15, butene-2: 30, isobutene: 5. The ethylene content in the dry gas was 20% by volume. The ratio of dry gas to mixed carbon four in the feed is 3 (by volume). The reactor is a single stage, filled with two layers of catalysts. The catalyst of the first layer is Mo / Mg metal oxide, and the catalyst of the second layer is ZSM-5 molecular sieve. The reaction temperature is 400° C., and the reaction pressure is 0.3 MPa. C 2 - The proportion of fraction recycle is 100% by volume. Cycle C 4 The mixture accounts for the C contained in the reactor outlet product 4 The proportion of 80% (volume). Towers 1 to 3 and the propylene rectification tower are sieve tray towers.

[0043] Experiments have shown that the propylene product obtained in the present invention is 41.8% (by weight, for the olefin content in the raw material).

Embodiment 2

[0045] according to figure 1 As shown, the composition (% by weight) of the refinery mixed C4 is: isobutane: 40, n-butane: 10, n-butene: 15, butene-2: 30, isobutene: 5. The ethylene content in the dry gas was 20% by volume. The ratio of dry gas to mixed carbon four in the feed is 5 (by volume). The reactor has two sections, the catalyst loaded in the first section is W / Mg metal oxide, and the catalyst in the second layer is SAPO-11 molecular sieve. The reaction temperature is 500° C., and the reaction pressure is 0.15 MPa. C 2 - The proportion of fraction recycle is 85% by volume. Cycle C 4 The mixture accounts for the C contained in the reactor outlet product 4 The proportion of 67% (volume). Towers 1 to 3 and the propylene rectification tower are sieve tray towers.

[0046] Experiments have shown that the propylene product obtained in the present invention is 39.3% (by weight, for the olefin content in the raw material).

Embodiment 3

[0048] according to figure 1 As shown, the composition (% by weight) of the refinery mixed C4 is: isobutane: 40, n-butane: 10, n-butene: 15, butene-2: 30, isobutene: 5. The ethylene content in the dry gas was 20% by volume. The ratio of dry gas to mixed carbon four in the feed is 8 (by volume). The reactor has three sections, the catalyst loaded in the first section is W / Mo / Mg metal, and the catalyst in the second and third layers is ZSM-5 molecular sieve. The reaction temperature is 500° C., and the reaction pressure is 0.05 MPa. C 2 - The proportion of fraction recycle is 70% by volume. Cycle C 4 The mixture accounts for the C contained in the reactor outlet product 4 The proportion of 80% (volume). Towers 1 to 3 and the propylene rectification tower are sieve tray towers.

[0049] Experiments have shown that the propylene product obtained in the present invention is 43.1% (by weight, for the olefin content in the raw material).

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Abstract

The invention relates to a technology for preparing propylene by utilizing by-products in a refinery, mainly solving the problems that the chemical additional value of the by-products in the refinery in the prior art is low slightly. The invention achieves the purposes by adopting the technical scheme comprising the following steps: (1) the by-products in the refinery are mixed with butane and dry gas to obtain a mixture which enters a reactor from the top of the reactor; (2) reaction products flow out from the bottom of the reactor, and enter a tower 1 after being compressed and alkaline-cleaned; C3-fraction is obtained from the top of the tower 1, and C4+fraction is obtained from the bottom of the tower 1; (3) the C3-fraction enters a tower 2 after being compressed; C2-fraction is obtained from the top of the tower 2, and C3+fraction is obtained from the bottom of the tower 2; (4) a large amount of the C2-fraction circulates to the top of the reactor or an inlet of the second section; and the C3-fraction is rectified to obtain a polymer grade propylene product; and (5) the C4+fraction enters a tower 3; and C4 mixture is obtained from the top of the tower 3, a part of the C4 mixture extracted from the side surface circulates to the inlet at the top of the reactor, and C5+fraction is obtained from the bottom. The technology can be applied in the industrial fields of producing the propylene.

Description

technical field [0001] The invention relates to a process for producing propylene by utilizing refinery by-products. Background technique [0002] Mixed carbon dioxide and dry gas are two major by-products of refineries. The mixed C4 in the refinery mainly comes from the catalytic cracking unit (FCC), and the total amount of mixed C4 produced by other devices such as visbreaking, thermal cracking and coking is small. The total amount and composition of by-product mixed carbon four in catalytic cracking units vary according to the cracking depth and catalyst. Normally, the amount of mixed carbon four produced by catalytic cracking unit is about 9%-12% (weight) of the fresh feed of the unit, and its composition is characterized by high butane (especially isobutane) content and butadiene content. Very little, butene is about 50% (weight). Refinery dry gas mainly comes from secondary processing units of crude oil such as catalytic cracking and delayed coking. Among them, cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C4/06C07C4/10C07C2/00
Inventor 王伟跃
Owner 王伟跃
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