Organic Dimethyl DME LPG Compressed Liquid Chemical Intermediate
Price:
Negotiable
MOQ:
1T
Delivery Time:
7-15 Days
Brand:
JIURUNFA
Product Description
Organic Dimethyl DME LPG Compressed Liquid Chemical Intermediate
Overview
Molecular formula: CH3OCH3. DME is a derivative of the dehydration condensation of two molecules of methanol. At room temperature, it appears as a colorless, non-toxic gas or compressed liquid. This compound serves as an important organic chemical product and chemical intermediate.
Properties
DME demonstrates excellent stability in air, is non-corrosive, slightly toxic, and non-carcinogenic. It exhibits good miscibility with most polar and non-polar organic solvents.
As a crucial chemical intermediate, DME participates in various reactions:
- Alkylation with benzene in the presence of a catalyst
- Reaction with carbon monoxide to produce methyl acetate
- Homologation reactions yielding ethyl acetate and acetic anhydride
- Reaction with carbon dioxide to form methoxyacetic acid
- Interaction with fuming sulfuric acid or sulfur trioxide to create dimethyl sulfate
- Reaction with hydrogen cyanide to produce acetonitrile
Preparation
Laboratory Methods:
- Using trimethyl orthoformate prepared with ferric chloride as catalyst
- Thermal decomposition of sodium methyl carbonate at 320°C
- Williamson synthesis method using iodomethane and sodium methoxide under strict anhydrous conditions
Industrial Production:
- Originally recovered from methanol synthesis by-products
- Current methods include two-step (methanol dehydration) and one-step (direct syngas synthesis) processes
- Emerging methods utilizing carbon dioxide and biomass
Synthesis Methods of DME
One-Step Method
This method directly synthesizes DME from feedstock gas in a single step, combining methanol synthesis and dehydration processes.
Reaction Principle:
Methanol synthesis: CO + 2H2 → CH3OH
Methanol dehydration: 2CH3OH → CH3OCH3 + H2O
Catalyst: Bifunctional catalyst combining methanol synthesis (Cu-Zn-Al based) and dehydration (alumina, zeolites) components
Reaction Conditions:
- Temperature: 280-340°C
- Pressure: 0.5-0.8 MPa (up to 4.2 MPa in some processes)
Process Characteristics:
- Short process flow with reduced equipment investment
- High product quality (>98% DME selectivity)
- Technologically complex with demanding catalyst requirements
Representative Processes:
- Danish Topsøe Process: Multi-stage adiabatic reactor
- U.S. Air Products LPDME™: Slurry bubble column reactor
- Japanese NKK Process: Liquid phase DME method
Two-Step Method
This conventional method first synthesizes methanol from syngas, followed by dehydration to DME.
Process Steps:
- Methanol synthesis from syngas
- Methanol dehydration to DME
Catalyst:
- Methanol synthesis: Similar to one-step method catalysts
- Dehydration: ZSM-5 zeolite (gas-phase) or concentrated sulfuric acid (phasing out)
Process Characteristics:
- Mature technology with simple operation
- High product purity with good selectivity
- Longer production process with greater capital investment
- Sensitive to methanol market price fluctuations
Representative Processes:
- Gas-phase Method: Fixed-bed reactor with solid acid catalysts
- Liquid-phase Method: Sulfuric acid catalyst (being phased out)
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Company
Shandong Jiurunfa Chemical Technology Co., Ltd.
Location
Zone 1, China Resources Land Plaza, Lixia District, Jinan City, Shandong China
Contact Person
Sales