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Method for producing propylene continuously in switch mode

A switching type, propylene technology, applied in the direction of hydrocarbon cracking, organic chemistry, etc., can solve the problems of stable product quality, operational difficulties in subsequent processes, and large changes in the composition of reaction products, and achieve stable product quality and small composition changes. , the effect of good technical effect

Active Publication Date: 2008-02-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the production, due to the relatively fast deactivation of the catalyst, the composition of the reaction products in the initial and final stages changes greatly, which brings difficulties to the stability of product quality and the operation of the subsequent process. It provides a switchable continuous production Propylene method

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  • Method for producing propylene continuously in switch mode

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Embodiment 1

[0013] The production process of propylene by catalytic cracking of olefins with carbon four and above adopts the switching continuous production process shown in Figure 1. The reactor includes three fixed beds, two fixed beds are used for reaction, and one is used for regeneration. The reaction temperature is 600°C, the space velocity is 14 hours-1, normal pressure, the catalyst life is 48 hours, that is, the reactor is switched once every 48 hours, and each reactor is switched every 24 hours. The molar ratio of silicon to aluminum (SiO 2 / Al 2 o 3 ) is the ZSM-5 type molecular sieve catalyst of 200, and the reaction raw material is carbon four etherified in ethylene factory.

Embodiment 2

[0015] The production process of propylene by catalytic cracking of olefins with carbon four and above adopts the switching continuous production process shown in Figure 1. The reactor includes four fixed beds, three fixed beds are used for reaction, and one is used for regeneration. The reaction temperature is 600°C, the space velocity is 14 hours-1, normal pressure, the catalyst life is 48 hours, that is, the reactor is switched once every 48 hours, and each reactor is switched every 16 hours. The molar ratio of silicon to aluminum (SiO 2 / Al 2 o 3 ) is a ZSM-5 type molecular sieve catalyst of 200, and the reaction raw material is ethylene plant etherified carbon four, and the composition of the initial stage and the final stage of the reaction product is shown in Table 1, and the propylene yield is 25.84~23.42%.

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Abstract

This invention relates to a changeover method for continuously manufacturing propylene by C4+ alkenes catalytic cracking. The method adopts a reactor with a set of parallel fixed beds. Each fixed bed is operated according to a certain interval, and the products of all fixed bed are mixed and sent to the next process so that the reactant of the next process has stable composition. The method solves the problems of low catalyst activity and large change of product composition at the beginning and end of reaction, which leads to difficulties in stable quality and next process. The method can be used in propylene industrial manufacture by C4+ alkenes catalytic cracking.

Description

technical field [0001] The invention relates to a method for switching continuous production of propylene, in particular to a method for catalytic cracking of C4 and above olefins using a fixed-bed reactor for switching continuous production of propylene. Background technique [0002] The main advantage of the fixed bed reactor is that the flow of the fluid in the bed is close to plug flow, and the chemical reaction speed is faster; a larger production capacity can be obtained with a smaller amount of catalyst and a smaller reactor volume; the residence time of the fluid can be strictly controlled. Control, the temperature distribution can be adjusted appropriately, which is conducive to improving the conversion rate and selectivity of chemical reactions. In addition, the axial fixed bed reactor has simple structure, convenient operation, low investment cost, less mechanical wear of the catalyst in the bed, and can be operated under high temperature and high pressure, so it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C4/06
Inventor 谢在库钟思青刘星陈晓峰
Owner CHINA PETROLEUM & CHEM CORP
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