Method for production of lower olefin

An olefin and low-level technology, applied in the field of preparation of low-level olefins, can solve problems such as decline, achieve the effects of inhibiting deposition, reducing permanent deactivation, and simplifying operation

Active Publication Date: 2008-11-19
JGC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] In this Patent Document 5, the reason for the increase in the yield of propylene is not particularly explained, but it is presumed that in the method described in Patent Document 5, the increase in the yield of propylene is due to a decrease in the partial pressure of the raw material.

Method used

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  • Method for production of lower olefin
  • Method for production of lower olefin
  • Method for production of lower olefin

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preparation example Construction

[0065] In such a method for producing lower olefins of the present invention, when the temporarily deactivated zeolite catalyst is regenerated, the zeolite catalyst exhibits the same high catalyst activity as when it was first used, and effectively suppresses carbon even after regeneration. It can prevent the deposition of substances on the surface of zeolite catalysts, and can continuously produce lower olefins for a long time. The propylene selectivity refers to the ratio of the amount of propylene produced to the total amount of hydrocarbon products obtained in all reaction systems per unit time. That is, the propylene selectivity in the hydrocarbon product can be represented by the following mathematical formula.

[0066] [mathematical formula 1]

[0067] However, in the present invention, since the hydrocarbon product refers to the total amount of fractions obtained from the outlet of the olefin preparation reactor, "all hydrocarbon products" include the components o...

Embodiment 1

9.50g of Al(NO 3 ) 3 9H 2 O, 10.92g of Ca(CH 3 COO) 2 ·H 2 The zeolite raw material liquid composed of O was dissolved in 750 g of water, and then added while stirring, and 500 g of colloidal silicon dioxide Si-30 sodium silicate (manufactured by Catalyst Chemical Industry Co., Ltd.) was dissolved in 333 g of water, and 177.5 g of 6% by mass NaOH aqueous solution, and 317.6g of 21.3% by mass tetrapropylammonium bromide aqueous solution, and 15.0g (corresponding to the amount of 10% by mass of the zeolite catalyst used for synthesis without seed crystals) as zeolite seed crystals and average A zeolite having an ammonium-type MFI structure with a particle diameter of 0.5 μm (manufactured by Zeolyst, Si / Al atomic ratio: 70) was used to obtain an aqueous gel mixture.

[0101] Next, this aqueous gel mixture was placed in a 3 L autoclave, and stirred at 160° C. for 18 hours under its own pressure to perform hydrothermal synthesis.

[0102] The white solid product produced by...

Embodiment 2

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Abstract

Disclosed is a method for production of a lower olefin from a raw material containing dimethyl ether (DME), which can produce a lower olefin (e.g., propylene) with good yield and in an economically advantageous manner by prolonging the time until the temporary deactivation of a zeolite catalyst and preventing the permanent deactivation of the catalyst, can reduce the amount of water to be recycled to increase the thermal efficiency of the process, and can simplify the facilities and operations. Also disclosed is a method for improving the yield of propylene with good efficiency under practical operation conditions. A feed gas which comprises a DME-containing raw material gas and an additive gas and further contains steam at a specific proportion is introduced into an olefin production reactor to contact the feed gas with a zeolite catalyst, thereby producing a hydrocarbon product containing a C2-C5 olefin. Propylene or the like is separated / collected from the hydrocarbon product, and at least a part of the remainder is used as at least a part of the additive gas.

Description

technical field [0001] The invention relates to a method for preparing lower olefins such as propylene from raw material gas containing dimethyl ether. In particular, the present invention relates to a method for producing lower olefins capable of obtaining propylene in a high yield from a raw material gas containing dimethyl ether using a catalyst. Background technique [0002] So far, there has been a method of converting dimethyl ether or a mixture of dimethyl ether and methanol into lower olefins containing ethylene and propylene after contacting with a zeolite catalyst for dehydration. [0003] In this method, the dehydration reaction is continuously carried out while supplying the raw material gas containing dimethyl ether to the zeolite, but since the deposited carbonaceous matter adheres to the pore surface of the zeolite over time, active points that have an effective effect on the reaction Poisoning, therefore has the problem of gradual deactivation (temporary dea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20B01J29/40C07C7/04C07C11/04C07C11/06C07B61/00
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 伊藤浩文本田一规大山弘二近松伸康平冈一高冲田充司
Owner JGC CORP
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