US 9,844,770 B2Granted

Catalyst used in the production of ethylene and propylene from methanol and/or dimethyl ether, method for preparing the same and method for using the same

AssigneeDalian Institute of Chemical Physics, Chinese Academy of Sciences

InventorsLei Xu, Zhongmin Liu, Shukui Zhu, Zhengxi Yu

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Abstract

The application provides a catalyst for producing ethylene and propylene from methanol and/or dimethyl ether, and a preparation and application thereof. In the present application, a molecular sieve catalyst co-modified by rare earth metals and silanization is utilized. First, the material containing methanol and/or dimethyl ether reacts on the catalyst to generate hydrocarbons. The hydrocarbons are separated into a C1-C5 component and a C6+ component. Then the C6+ component is recycled to the feeding port and fed into the reactor after mixing with methanol and/or dimethyl ether. The above steps are repeated, to finally generate C1-C5 products, in which the selectivity for ethylene and propylene can reach more than 90 wt % in the C1-C5 component, so that the maximal yield can be achieved in the production of ethylene and propylene from methanol and/or dimethyl ether.

Claims6

Dependent claims

A process for producing ethylene and propylene from methanol and/or dimethyl ether, comprising the steps of;

(a) contacting methanol and/or dimethyl ether with a catalyst to generate a first stream containing hydrocarbons, the catalyst produced by the steps consisting of:
(i) impregnating a HZSM-5 and/or a HZSM-11 zeolite molecular sieve in a lanthanum nitrate solution for 1-12 hours, followed by filtering, drying and calcining to obtain a lanthanum-modified molecular sieve;
(ii) impregnating said obtained lanthanum-modified molecular sieve in one or more silicon sources selected from the group consisting of tetramethyl silicate, tetraethyl silicate, and silicon tetraethyl for 1-12 hours, followed by filtering, drying and calcining to obtain a molecular sieve catalyst co-modified by lanthanum and silanization;
(b) separating said first stream obtained from step (a) into a first C1-C5 component and a first C6+ component;
(c) mixing said first C6+ component obtained from step (b) with methanol and/or dimethyl ether to generate a mixture material, and contacting the mixture material with said catalyst to generate a second stream containing hydrocarbons;
(d) separating said second stream obtained from step (c) into a second C1-C5 component and a second C6+ component, wherein said second C1-C5 component contains ethylene and propylene and is collected as a target product and said second C6+ component is recycled to step (c);
and
(e) repeating step (c) and step (d), wherein the mixture material formed by mixing said second C6+ component obtained in step (d) with methanol and/or dimethyl ether is used in step (c), so that said second C1-C5 component containing ethylene and propylene is obtained continuously;
wherein said catalyst co-modified by lanthanum and silanization is the only catalyst used in the process, said catalyst is loaded by lanthanum, and a surface acidity of said catalyst is modified by silicon compounds;
and
wherein a loading amount of said lanthanum is 0.5-5 wt % of a total weight of said catalyst, and a loading amount of said silicon compounds, which is based on silicon oxide, is 0.1-10 wt % of the total weight of said catalyst.

8 more elements

A process for producing ethylene and propylene from methanol and/or dimethyl ether, comprising the steps of;

(a) contacting methanol and/or dimethyl ether with a catalyst to generate a first stream containing hydrocarbons, the catalyst produced by the steps consisting of:
(i) impregnating a HZSM-5 and/or a HZSM-11 zeolite molecular sieve in a lanthanum nitrate solution for 1-12 hours, followed by filtering, drying and calcining to obtain a lanthanum-modified molecular sieve;
(ii) impregnating said obtained lanthanum-modified molecular sieve in one or more silicon sources selected from the group consisting of tetramethyl silicate, tetraethyl silicate, and silicon tetraethyl for 1-12 hours, followed by filtering, drying and calcining to obtain a molecular sieve catalyst co-modified by lanthanum and silanization;
(b) separating said first stream obtained from step (a) into a first C1-C5 component and a first C6+ component;
(c) mixing said first C6+ component obtained from step (b) with methanol and/or dimethyl ether to generate a mixture material, and contacting the mixture material with said catalyst to generate a second stream containing hydrocarbons;
(d) separating said second stream obtained from step (c) into a second C1-C5 component and a second C6+ component, wherein said second C1-C5 component contains ethylene and propylene and is collected as a target product and said second C6+ component is recycled to step (c);
and
(e) repeating step (c) and step (d), wherein the mixture material formed by mixing said second C6+ component obtained in step (d) with methanol and/or dimethyl ether is used in step (c), so that said second C1-C5 component containing ethylene and propylene is obtained continuously;
wherein said catalyst co-modified by lanthanum and silanization is loaded by lanthanum, and a surface acidity of said catalyst is modified by silicon compounds;
and wherein a loading amount of said lanthanum is 0.5-5 wt % of a total weight of said catalyst, and a loading amount of said silicon compounds, which is based on silicon oxide, is 0.1-10 wt % of the total weight of said catalyst.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/366,156Filed 23 Apr 2012
Priority: CN 2011 1 042728019 Dec 2011
Published: US 2015/0005559 A11 Jan 2015
Granted: 19 Dec 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B01J 29/405
Of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively:…
C07C 1/20
Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon: starting from organic compounds containing only oxygen…
C07C 1/22
Starting from organic compounds containing only oxygen atoms as heteroatoms: by reduction
B01J 2229/186
To introduce other elements into or onto the molecular sieve itself: not in framework positions