MTBE Production from Ethane Cracking and Isomerization
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Solution Overview
Problem
There is a need to manufacture methyl tertiary-butyl ether (MTBE) and additional gasoline blend stocks from feedstocks other than traditional sources, as existing methods rely on isobutane and butane streams, limiting the availability of alternative olefinic feed components.
Innovation Solution
A process involving multiple steps: cracking ethane or propane to form ethylene, dimerizing ethylene to form n-butylene, isomerizing n-butylene to form isobutylene, optionally oxidizing methane to form methanol, and etherifying isobutylene with methanol to produce MTBE, while also recovering unconverted ethylene and n-butylene for further processing to form gasoline alkylates and higher molecular weight ethylene oligomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional isobutane and butane streams are used as feedstocks, then MTBE production is achieved, but the availability of alternative olefinic feed components is limited
Solution Approach 1:
The patent applies universality by enabling ethylene to serve multiple functions in the process: it is dimerized to form n-butylene, which is then isomerized to isobutylene for MTBE production. The same ethylene feedstock can also be used to produce gasoline blend stocks through alkylation, making the process versatile and adaptable to different product requirements while using a single primary olefinic feedstock
Solution Approach 2:
The patent employs parameter changes by transforming ethylene through controlled chemical reactions with specific catalysts and conditions. The dimerization step converts ethylene to n-butylene under specific catalytic conditions, and subsequent isomerization converts n-butylene to isobutylene. These parameter changes in molecular structure enable the use of ethylene as an alternative feedstock while maintaining product quality
2Ease of manufacture
If ethylene is used as the olefinic feed component, then cost-effective MTBE production is achieved, but additional processing steps are required
Solution Approach 1:
The patent applies preliminary action by performing dimerization of ethylene to n-butylene before the main isomerization and etherification steps. This preliminary transformation prepares the feedstock in the required form for subsequent reactions, enabling cost-effective use of ethylene while systematically managing the multi-step process through staged preparation and transformation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process provides a cost-effective method to produce MTBE and gasoline alkylates using ethylene as a versatile olefinic feed component, enhancing the production of high-value gasoline blend stocks with improved octane number and low sulfur content.
Implementation Method 1
cracking raw material made from or containing ethane and/or propane, to form ethylene
Implementation Method 2
dimerizing ethylene to form n-butylene
Implementation Method 3
isomerizing the n-butylene to form isobutylene
Implementation Method 4
oxidizing methane to form methanol
Implementation Method 5
etherifying the isobutylene with methanol to form methyl t-butyl ether
Data Source
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AI summary
A process for manufacturing methyl t-butyl ether (MTBE) including (A) an optional first step including cracking raw material made from or containing ethane and/or propane, to form ethylene and recovering the residual uncracked raw material, (B) a second step including dimerizing ethylene to form n-butylene, (C) a third step including isomerizing the n-butylene to form isobutylene, (D) an optional fourth step including oxidizing methane to form methanol, (E) a fifth step including etherifying the isobutylene with methanol to form methyl t-butyl ether, and (F) a sixth step including collecting the methyl t-butyl ether is provided. The process can also be used to prepare gasoline alkylate, a higher molecular weight ethylene oligomer, a higher-molecular-weight-ethylene-oligomer-based methyl ether, an isomerized higher molecular weight ethylene oligomer, or an isomerized-higher-molecular-weight-ethylene-oligomer-based methyl ether.