The physical and chemical properties of liquefied two methyl ether are similar to liquefied petroleum gas. All along, a lot of domestic manufacturers of two methyl ether will be mixed into the liquefied petroleum gas two, liquefied petroleum gas cylinders, but two of the gas cylinder is easy to cause leakage of the valve. Therefore, in 2008 the State Administration of Quality Supervision Inspection and Quarantine issued the notice on the relevant issues concerning the cylinder filling, explicitly prohibit adding dimethyl ether in the liquefied petroleum gas, cylinder must be dedicated.

Two relevant national standard is about to introduce

At present, the liquefied dimethyl ether cylinders ", the liquefied dimethyl ether bottle valve" two national standards are being submitted for approval, however, excellent performance, price suitable resistant dimethyl ether rubber sealing material in the market, but it is difficult to find, will make the steel cylinder of liquefied dimethyl ether and liquefied dimethyl ether bottle valve production in trouble. Xiang Zhao Zeng, a member of the LPG cylinder Standards Technical Committee said that applicable to cylinders of liquefied dimethyl ether and liquefied dimethyl ether bottle valve rubber sealing material business opportunities in front, the rubber products industry should be developed and popularized as soon as possible.

Analysis of liquefied petroleum gas cylinder doped into dimethyl ether. The reason to cause valve leakage. The reason is that the liquefied petroleum gas cylinder valve seal is nitrile rubber, liquefied petroleum gas is of alkanes, is extremely low material, nitrile rubber is strong polarity material, polarity is not similar is not compatible, so more than 50 years to liquefied petroleum gas cylinder valve safe. And liquefied dimethyl ether and acrylonitrile butadiene rubber is strong polarity material, "similar dissolves". Therefore, liquefied dimethyl ether mixed mixed to liquefied petroleum gas soon after the valve of liquefied petroleum gas cylinder of nitrile rubber sealing ring is liquefied dimethyl ether with swelling, a leak was present.

The valve manufacturing company had chosen PTFE valve sealing material, on the grounds that PTFE is known as "the king of plastic", can resist alkali corrosion, of course, also can resistant dimethyl ether. But in less than 3 years, there was a leak. Once Xiangzhao analysis, reason is that PTFE has the plastic characteristics usually, it does not have the elasticity, wear, not extrusion resistance, for a long time in high stress will produce should stress relaxation and creep, these properties may lead to PTFE sealing performance failure.

As soon as possible to develop special cylinders for liquefied dimethyl ether and liquefied dimethyl ether special valve, to adapt to the development of new energy dimethyl ether, completely solve the liquefied dimethyl ether mixed mixed liquefied petroleum gas leakage and other security risks, the State General Administration of quality supervision, inspection and quarantine requirements National Standardization Technical Committee of cylinders as soon as possible to establish national standards for our country dimethyl ether special steel cylinder and liquefied dimethyl ether special valves. At present, the "two cylinders of liquefied petroleum ether", "liquefied petroleum ether bottle valve" two national standards are being submitted for approval in the two. It is urgent to find the ideal resistance of two methyl ether rubber seal material.

‍‍