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Organic Dimethyl DME LPG Compressed Liquid Chemical Intermediate

Product Details

Place of Origin: Shandong China

Brand Name: JIURUNFA

Certification: ISO9001

Model Number: DEM

Payment & Shipping Terms

Minimum Order Quantity: 1T

Price: Negotiable

Packaging Details: 50kg/100kg cylinders or ISO tanks

Delivery Time: 7-15 Days

Payment Terms: L/C,D/A,D/P,T/T

Supply Ability: 100000T

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Product Details

Product Description

Product Details

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                                                                                                                                                                                                                                                                                                                dme lpg Liquid, dme lpg Chemical intermediate, dme dimethyl Chemical
                              

Autoignition Temperature:	180 °C	Appearance:	Colorless Gas
Refractive Index:	1.2207 (gas)	Melting Point:	-141.5 °C
Molecular Weight:	46.07 G/mol	Boiling Point:	-24.9 °C
Molecular Formula:	C2H6O	Density:	0.664 G/cm3

Autoignition Temperature:	180 °C
Appearance:	Colorless Gas
Refractive Index:	1.2207 (gas)
Melting Point:	-141.5 °C
Molecular Weight:	46.07 G/mol
Boiling Point:	-24.9 °C
Molecular Formula:	C2H6O
Density:	0.664 G/cm3

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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