Use of catalyst to adjust product distributions in MTO process

Patent metadata

Field	Value
Publication number	US-10093593-B2
Application number	US-201715618016-A
Country	US
Kind code	B2
Filing date	Jun 8, 2017
Priority date	Dec 11, 2014
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

A process is presented for generating light olefins with the methanol to olefins process from a combination of catalysts. The process controls the product distribution for ethylene, propylene and butylenes, to enable shifting of the product distribution. The process includes passing a second catalyst to a reactor while the process is on-going.

First claim

The invention claimed is:

1. A process for the production of light olefins comprising:
passing a first catalyst feed comprising a first catalyst to an MTO reactor wherein the MTO reactor in a fluidized bed reactor system;
passing an oxygenate stream to an MTO reactor to generate an effluent stream comprising olefins, and having a propylene to ethylene product distribution, for converting oxygenates to olefins;
sampling the effluent stream to measure the propylene to ethylene to butylenes product distribution;
continuing the first catalyst feed to the MTO reactor until a second olefins product distribution is desired;
discontinuing passing the first catalyst feed to the MTO reactor;
passing a second catalyst feed comprising a second catalyst to the MTO reactor;
sampling the effluent stream to measure the propylene to ethylene to butylenes product distribution; and
continuing the second catalyst feed to the MTO reactor until a new propylene to ethylene to butylenes product distribution is achieved.

2. The process of claim 1 further comprising passing the effluent stream to a light olefins recovery unit to generate an ethylene stream, a propylene stream, and a heavies stream.

3. The process of claim 2 further comprising:
passing the heavies stream to an olefins cracking unit to generate an olefins cracking effluent stream; and
passing the olefins cracking effluent stream to the light olefins recovery unit.

4. The process of claim 2 further comprising generating a butenes stream in the light olefins recovery unit.

5. The process of claim 4 further comprising passing a portion of the ethylene stream and a portion of the butenes stream to a metathesis unit to generate a methathesis stream comprising propylene.

6. A process producing olefins in a methanol to olefins conversion process, comprising:
splitting an oxygenate feed into two portions;
passing a first portion of the oxygenate feed to a first MTO reactor comprising a first catalyst to generate a first MTO reactor effluent;
passing a second portion of the oxygenate feed to a second MTO reactor comprising a second catalyst to generate a second MTO reactor effluent;
combining the first reactor effluent and the second reactor effluent to generate a combined effluent stream;
sampling the combined effluent stream to measure the propylene to ethylene to butylenes product distribution; and
adjusting the splitting of the oxygenate feed into two portions to further adjust the combined product stream.

7. The process of claim 6 further comprising passing the combined effluent stream to a DME recovery unit to generate an olefins process stream and a DME recycle stream.

8. The process of claim 7 further comprising passing the olefins process stream to a light olefins recovery unit to generate an ethylene stream, a propylene stream, and a heavies stream.

Assignees

• Uop Llc

Inventors

• Funk Gregory A
• Bozzano Andrea G
• Schoenfeldt Nicholas J
• Chellppannair Thulasidas
• Spieker Wolfgang A
• Vora Bipin V

Classifications

• Y02P30/40

  Ethylene production · CPC title

• Y02P30/20

  using bio-feedstock · CPC title

• C07C2529/85

  Silicoaluminophosphates (SAPO compounds) · CPC title

• C07C4/02

  by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction · CPC title

• C07C6/04

  at a carbon-to-carbon double bond · CPC title