Method and reaction equipment for preparing dimethyl ether and olefin from methanol

Patent metadata

Field	Value
Publication number	US-10029966-B2
Application number	US-201615268456-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Nov 17, 2015
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

The present invention relates to a method for preparing dimethyl ether from methanol which is carried out in a reaction device arranged with a plurality of catalyst bed layers connected in series, and comprises: dividing the reactant stream that contains methanol into n substreams, and feeding these different substreams into the reaction device through top feed ports or side feed ports between the catalyst bed layers of the reaction device for methanol-to-dimethyl ether reaction; wherein, the temperature T1 of the substream fed into the first catalyst bed layer is controlled within the following range: 290−50K1≤T1≤150K12−271K1+397.5; where, 1>K1≥0.5, and T1 is in unit of ° C.

First claim

We claim:

1. A method for preparing dimethyl ether from methanol carried out in a reaction device arranged with a plurality of catalyst bed layers connected in series, which method comprising:
dividing a reactant stream containing methanol into n substreams, n being an integer greater than 2, and feeding the n substreams into the reaction device through top feed port or side feed ports between catalyst bed layers of the reaction device to undergo a methanol-to-dimethyl ether reaction;
wherein, according to flow directions of the reactant stream, the n substreams each have a flow rate F1˜Fn, respectively, allocation proportions Ki of the reactant in the substreams are Fi/F0, F0 being the sum of F1˜Fn, i being an integer in the range of 1˜n, and n being an integer greater than 2, and
wherein the substream fed into the first catalyst bed layer has a temperature T1 that is controlled within the following range:
290−50 K 1≤ T 1≤150 K 1 2 −271 K 1+397.5

where 1>K1≥0.5, and T1 is in unit of ° C.

2. The method for preparing dimethyl ether from methanol according to claim 1 , wherein 2≤n≤8.

3. The method for preparing dimethyl ether from methanol according to claim 1 , wherein 0.95≥K1≥0.6.

4. The method for preparing dimethyl ether from methanol according to claim 1 , wherein 1>K1≥0.6.

5. The method for preparing dimethyl ether from methanol according to claim 1 , wherein the allocation proportion Ki of the reactant in the substream i

Ki
≥

(

1
-

∑

i
=
1

i
-
1

⁢

K
i

)

×
50
⁢
%

,

wherein i≠1.

6. The method for preparing dimethyl ether from methanol according to claim 1 , wherein the number of the catalyst bed layers is greater than or equal to n.

7. The method for preparing dimethyl ether from methanol according to claim 1 , wherein the reaction device comprises one or more fixed bed reactors, with said a plurality of catalyst bed layers arranged in the one or more fixed bed reactors.

Assignees

• China Petroleum & Chem Corp
• Shanghai Res Inst Petrochemical Tech Sinopec

Inventors

• Hu Shuai
• Jin Xin

Classifications

• B01J8/0453

  the beds being superimposed one above the other · CPC title

• B01J2208/00256

  in a heat exchanger for the heat exchange medium separate from the reactor · CPC title

• C07C41/09 Primary

  by dehydration of compounds containing hydroxy groups · CPC title

• B01J8/0492

  Feeding reactive fluids (for solid material, see B01J8/0015) · CPC title

• C07C1/20

  starting from organic compounds containing only oxygen atoms as heteroatoms · CPC title