US RE50,515 E1 · Methods for producing ethylene and propylene from naphtha

Abstract

The presently disclosed subject matter relates to methods of producing ethylene and propylene by the catalytic steam cracking of naphtha using an HZSM-5 catalyst. An example method can include providing a naphtha feedstock, providing steam, and providing an HZSM-5 catalyst. The method can further include preparing the HZSM-5 catalyst by titanium modification or alkaline treatment, followed by phosphorus modification. The method can further include feeding the naphtha feedstock and steam to a reactor containing the catalyst and removing an effluent from the reactor having a combined yield of ethylene and propylene of greater than about 45 wt-%.

Claims16

Dependent claims

A method for producing ethylene and propylene from catalytic steam cracking of naphtha, the method comprising:

(a) providing a naphtha feedstock;
(b) providing steam;
(c) providing a catalyst consisting of phosphorus modified Ti-containing HZSM-5;
(d) feeding the naphtha feedstock and the steam to a reactor comprising the catalyst, thereby producing an effluent comprising ethylene and propylene;
and
(e) removing the effluent from the reactor, the effluent having a combined yield of ethylene and propylene greater than about 45 percent by weight;
wherein the catalyst comprises from about 1.0 to about 10.0 percent by weight P2O5, and
wherein the catalyst comprises from about 1.0 to about 5.0 percent by weight Ti.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/591,192Filed 2 Feb 2022 · us provisional application

Priority

22 Dec 2015

Granted

5 Aug 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

C10G 11/05
Oxides: crystalline alumino-silicates, e.g. molecular sieves
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:…
B01J 29/89
Catalysts comprising molecular sieves: silicates, aluminosilicates or borosilicates of titanium, zirconium or hafnium
C10G 9/36
By direct contact with inert preheated fluids, e.g. with molten metals or salts: with heated gases or vapours

Family

Application62/270,722Us provisional application · filed 22 Dec 2015

Application16/061,592Reissue · filed 13 Dec 2016

US 10,550,333 B2Reissue · filed 4 Feb 2020

US 10,519,384 B2Related patent

US 2018/0355259 A1Published application

US RE50,515 E1This patent

From the US filing history. Foreign family members aren’t listed.

Methods for producing ethylene and propylene from naphtha

Life of this patent

Methods for producing ethylene and propylene from naphtha

Life of this patent

Abstract

Claims16