Dimethyl Ether Aerosol Grade

 

The production standard of aerosol grade dimethyl ether:

GB 190-1990 Dangerous Goods Packaging Marking

GB 5100-1994 Steel Welded Cylinders

GB/T 6023-2008 Determination of trace water in butadiene for industrial use Karl Fischer coulometric method

GB/T 6678-2003 General Rules for Sampling of Chemical Products

GB/T 6680-2003 General Rules for Sampling of Liquid Chemical Products

GB/T 6682-2008 Water Specifications for Analytical Laboratories

GB/T 8170-2008 Numerical rounding off rules and expression and determination of limit values

GB/T 9722-2006 Chemical Reagents General Rules for Gas Chromatography

GB 14193-1993 Regulations for filling liquefied gas cylinders

HG/T 3934-2007 Dimethyl ether

SH 0233-1992 Liquefied Petroleum Gas Sampling

 

Technical requirements for aerosol grade dimethyl ether

1. Sensory requirements

It is a colorless, odorless gas at room temperature.

2. Physical and chemical indicators

The technical indicators of aerosol dimethyl ether should meet the requirements in Table 1.

 

Table 1 Technical Indicators

Project	Superior product index	First-class index
Dimethyl ether mass fraction/% ≥	99.99	99.90
Mass fraction of methanol /% ≤	0.003	0.050
mass fraction of water /% ≤	0.005	0.030
Mass fraction of light components /% ≤	0.002	0.02
acidity（H2SO4 count）/% ≤	0.0003	0.0003
Note: The acidity measurement is only carried out when the product is used as a refrigerant

 

Test method for aerosol grade dimethyl ether:

1. Sensory index test

Carefully open the valve at the lower end of the sampler, fan the dimethyl ether gas by hand, and smell the dimethyl ether, there should be no peculiar smell.

2. Determination of volume fraction of light components (CO, CO2, CH4, C2H4, C3H6), methanol and other impurities

2.1 Method summary

Using gas chromatography, under appropriate chromatographic conditions, the gasified sample is separated by a chromatographic column and detected by a thermal conductivity detector (TCD). Quantification of minor components.

2.2 Instruments and reagents

2.2.1 Gas chromatograph: equipped with thermal conductivity detector (TCD), PLOT Q capillary chromatographic column, temperature-controllable gas sampling system, and quantitative loop 0.5mL. Sensitivity and stability meet GB/T 9722 standard requirements.

2.2.2 Chromatographic data processing system: chromatographic workstation.

2.2.3 Electric temperature controller: electric heating belt heating, which can control the temperature of the injection pipeline at 200±2°C.

2.2.4 Sampler: stainless steel double-valve liquefied petroleum gas sampler, which meets the requirements of SH/T 0233 standard, and the working pressure is not lower than 3.1MPa.

2.2.5 Hydrogen (or helium): purity ≥99.995%.

2.2.6 Standard sample: Prepared by a department with qualifications for standard preparation. The content of impurity components such as methanol, ethylene, propylene, methane, ethane, propane, carbon monoxide, carbon dioxide, etc. in the standard sample should be close to that of the actual industrial production sample, with nitrogen (or hydrogen) as the balance gas. The uncertainty of the nominal value of each impurity component content shall not be greater than 3%.

 

The role of aerosol grade dimethyl ether:

From the perspective of dimethyl ether consumption, aerosol propellant is one of the main uses of dimethyl ether. Since the 1960s, aerosol products have been popular with consumers due to their unique packaging characteristics. In the past, a large number of aerosol products used chlorofluorocarbons as propellants. When they were used, they were all released into the atmosphere, causing serious damage to the atmospheric ozone layer, thereby affecting human health, animal and plant growth, and the earth's ecological environment. Therefore, all countries in the world are working hard to find substitutes for Erbauxin. Since 1988, my country has banned the use of chlorofluorocarbons (except medical supplies) as propellants in aerosols. Alternatives to chlorofluorocarbons now include LPG, DME, compressed gas (CO2, N2, N2O), hydrochlorofluorocarbons, hydrofluorocarbons and other substances. With its good performance in the aerosol industry, DME is gradually replacing other aerosols and becoming the main body of the fourth-generation propellant. It can also be used as an air freshener, insect repellent, foam caulk, streamers, and more.

 

Storage and transportation of aerosol grade dimethyl ether:

Store

 

Transportation

The safety cap on the steel cylinder must be worn when transported in steel cylinders. The steel cylinders are generally placed flat, and the bottle mouths should face the same direction, and cannot be crossed; the height should not exceed the vehicle's guardrail, and should be locked with a triangular wooden pad to prevent rolling. During transportation, the transport vehicle should be equipped with corresponding types and quantities of fire-fighting equipment. The exhaust pipe of the vehicle carrying this item must be equipped with a fire arresting device, and it is forbidden to use mechanical equipment and tools that are prone to sparks to load and unload. It is strictly forbidden to mix and transport with oxidants, acids, halogens, food chemicals, etc. In summer, it should be transported in the morning and evening to prevent sun exposure. Stay away from fire and heat sources during stopovers. When transporting by road, follow the prescribed route, and it is forbidden to stay in residential areas and densely populated areas. It is forbidden to slip when transporting by rail.

 

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