Method for producing an aromatic hydrocarbon with an oxygenate as raw material

Patent metadata

Field	Value
Publication number	US-9783468-B2
Application number	US-201414528637-A
Country	US
Kind code	B2
Filing date	Oct 30, 2014
Priority date	Oct 30, 2014
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A method for producing an aromatic hydrocarbon with an oxygenate as raw material, includes: i) reacting an oxygenate in at least one aromatization reactor to obtain an aromatization reaction product; ii) separating the aromatization reaction product to obtain a gas phase hydrocarbons flow X and a liquid phase hydrocarbons flow Y; iii) after removing gas and/or a part of the oxygenate from the gas phase hydrocarbons flow X, a hydrocarbons flow X 1 containing a non-aromatic hydrocarbon is obtained; or after removing gas and/or a part of the oxygenate from the gas phase hydrocarbons flow X, a reaction is conducted in another aromatization reactor and a separation is conducted to obtain a flow X 2 containing a non-aromatic hydrocarbon and a flow X 3 containing an aromatic hydrocarbon. The flows are further treated.

First claim

The invention claimed is:

1. A method for producing an aromatic hydrocarbon with an oxygenate as raw material, comprising
i) reacting an oxygenate in at least one aromatization reactor to obtain an aromatization reaction product;
ii) separating the aromatization reaction product through a separation unit A, to obtain a gas phase hydrocarbons flow X and a liquid phase hydrocarbons flow Y;
iii) separating the gas phase hydrocarbons flow X through a separation unit B, to remove at least one substance and/or a part of the oxygenate and to obtain a hydrocarbons flow X 1 containing a non-aromatic hydrocarbon; or
separating the gas phase hydrocarbons flow X through a separation unit B to remove at least one substance and/or a part of the oxygenate and to obtain a remaining part, subjecting the remaining part to a second aromatization reaction in a second aromatization reactor, and separating the second aromatization reaction product through the separation unit A, to obtain a flow X 2 containing a non-aromatic hydrocarbon and a flow X 3 containing an aromatic hydrocarbon;
iv) subjecting the liquid phase hydrocarbons flow Y and optionally the flow X 3 containing an aromatic hydrocarbon to a non-precise rectification in a separation unit C, to obtain a mixed hydrocarbons flow M of an aromatic hydrocarbon having less than or equal to 7 carbon numbers and a flow N of residual hydrocarbons;
v) separating the flow N of the residual hydrocarbons through a separation unit D, to obtain a flow K containing a non-aromatic hydrocarbon, a C 8 aromatic hydrocarbon flow J and a C 9 + aromatic hydrocarbon flow L;
vi) recycling one of the hydrocarbons flow X 1 containing a non-aromatic hydrocarbon and the flow X 2 containing a non-aromatic hydrocarbon, the mixed hydrocarbons flow M of an aromatic hydrocarbon having less than or equal to 7 carbon numbers and/or a part or all of the flow K containing a non-aromatic hydrocarbon, optionally with an additional C 2 + hydrocarbons flow, to the above oxygenate; or
recycling one of the hydrocarbons flow X 1 containing a non-aromatic hydrocarbon and the flow X 2 containing a non-aromatic hydrocarbon, the mixed hydrocarbons flow M of an aromatic hydrocarbon having less than or equal to 7 carbon numbers and/or a part or all of the flow K containing a non-aromatic hydrocarbon to the aromatization reactor in iii);
vii) optionally, reacting the C 9 + aromatic hydrocarbons flow L in at least one reactor selected from a transalkylation reactor and a dealkylation reactor to obtain a C 8 aromatic hydrocarbon flow L 1 .

2. The method for producing an aromatic hydrocarbon with an oxygenate as raw material according to claim 1 , wherein the liquid phase hydrocarbons flow Y is separated by one of the following two manners:
1) flow Y enters a separation unit C 1 and is separated by a non-precise rectification to obtain a mixed hydrocarbons flow M 1 of aromatic hydrocarbons having less than or equal to 6 carbon numbers and a hydrocarbons flow N 1 having more than 6 carbon numbers, and the hydrocarbons flow N 1 enters a separation unit D 1 to obtain a C 8 aromatic hydrocarbon flow and a C 9 + aromatic hydrocarbon flow;
2) flow Y enters a separation unit C 2 and is separated by a non-precise rectification to obtain a mixed hydrocarbons flow M 2 of aromatic hydrocarbons having less than or equal to 7 carbon numbers and a hydrocarbons flow N 2 having more than 7 carbon numbers, and the hydrocarbons flow N 2 enters a separation unit D 2 to obtain a C 8 aromatic hydrocarbon flow and a C 9 + aromatic hydrocarbon flow.

3. The method for producing an aromatic hydrocarbon with an oxygenate as raw material according to claim 1 , wherein a part or all of the non-aromatic hydrocarbon flow and the flow of the oxygenate come into contact with a catalyst for reaction in the same aromatization reactor or by entering different aromatization reactors; at least one reactor selected from the group consisting of a transalkylation reactor and a dealkylation reactor in the method is used for converting a C 9 + aromatic hydrocarbon flow in the product of aromatic hydrocarbons to dimethylbenzene; the reaction conditions for said transalkylation reactor are a temperature of 350 to 550° C., a reaction pressure of 0.1 to 5.0 MPa, a molar ratio of hydrogen/hydrocarbon of 1.5:1 to 200:1, a weight space velocity of raw material of 0.1 to 5 h −1 ; the reaction conditions of said dealkylation reactor are a reaction temperature of 300 to 800° C., a molar ratio of hydrogen/hydrocarbon of 0.1 to 200:1 and a weight space velocity of the hydrocarbons of 0.5 to 10 h −1 .

4. The method for producing an aromatic hydrocarbon with an oxygenate as raw material according to claim 1 , comprising only one aromatization reactor, said method comprising the following steps:
a) under process conditions of a temperature of 400 to 550° C., a pressure of 0.01 to 2.0 MPa and a weight space velocity of raw material(s) of 0.1 to 4 h −1 , contacting a flow of oxygenate(s) with a catalyst for reaction in the aromatization reactor to obtain a first hydrocarbons flow;
b) removing CO 2 and a part of oxygenate(s) from said first hydrocarbons flow through a first separation unit to obtain a gas phase non-aromatic hydrocarbons flow, a liquid phase hydrocarbons flow containing an aromatic hydrocarbon and an aqueous phase;
c) removing at least one substance and a part of oxygenate(s) from said gas phase non-aromatic hydrocarbons flow through a second separation unit to obtain a C 2 + hydrocarbons flow;
d) further separating the liquid phase hydrocarbons flow containing an aromatic hydrocarbon according to one of the following four manners:
d1) subjecting the liquid phase hydrocarbons flow containing an aromatic hydrocarbon to non-precise rectification through a third separation unit to obtain a second hydrocarbon flow of aromatic hydrocarbons having less than or equal to 7 carbon numbers and a third hydrocarbon flow of aromatic hydrocarbons having more than 7 carbon numbers, and separating said third hydrocarbons flow through a fourth separation unit to obtain a fourth hydrocarbons flow, a flow containing C 8 aromatic hydrocarbon and a C 9 + aromatic hydrocarbon flow, and reacting said C 9 + aromatic hydrocarbon flow in a dealkylation reactor to obtain a C 8 aromatic hydrocarbon flow;
obtaining a fifth hydrocarbons flow of aromatic hydrocarbons having less than or equal to 7 carbon numbers from the second hydrocarbons flow and a part or all of the C 2 + hydrocarbons flow, wherein said fifth hydrocarbons flow further optionally comprises a part or all of at least one selected from the fourth hydrocarbons flow and a C 2 + hydrocarbons flow outside the reaction-separation system; and
returning said fifth hydrocarbons flow to the oxygenate(s) flow for further reaction;
d2) subjecting the liquid phase hydrocarbons flow containing an aromatic hydrocarbon to a non-precise rectification through a third separation unit to obtain a second hydrocarbon flow of aromatic hydrocarbons having less than or equal to 7 carbon numbers and a third hydrocarbons flow of aromatic hydrocarbons having more than 7 carbon numbers, and obtaining a fourth hydrocarbons flow containing non-aromatic hydrocarbons, a flow containing C 8 aromatic hydrocarbons and a first C 9 + aromatic hydrocarbon flow from said third hydrocarbons flow through a fourth separation unit;
obtaining a sixth hydrocarbon flow containing dimethylbenzene from a second C 9 + aromatic hydrocarbon flow and a methylbenzene flow outside the reaction-separation system through a transalkylation reactor, wherein the second C 9 + aromatic hydrocarbon flow is selected from one of a part or all of the first C 9 + aromatic hydrocarbon flow or a mixture of a part or all of the first C 9 + aromatic

Assignees

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

Inventors

• Wang Zheming
• Yang Weimin
• Chen Xiqiang
• Xiao Jingxian
• Xu Feng

Classifications

• C07C2529/40

  of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11 · CPC title

• C07C1/20

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

• C07C2529/18

  of the mordenite type · CPC title

• C07C6/126

  of more than one hydrocarbon · CPC title

• C07C7/08

  by extractive distillation · CPC title