Abstract: The present invention provides ammonia purification means to remove impurities such as oil with a negative effect on vapor deposition from inexpensive commercially available industrial crude ammonia and from crude ammonia recovered from the gallium nitride compound semiconductor process and to continuously supply the purified ammonia to the gallium nitride compound semiconductor process. The oil removing device removing oil from crude ammonia containing oil as impurities includes an oil filter cylinder accommodating a filtration element cylindrically formed from a filtration membrane processed into a shape of pleat, honeycomb, or space structure; and an oil adsorption cylinder filled with activated carbon. The ammonia purification apparatus is provided with the oil removing device; a catalyst cylinder filled with a catalyst containing nickel as an active component; and an adsorption cylinder filled with synthetic zeolite.

Abstract: The present invention provides ammonia purification means to remove impurities such as oil with a negative effect on vapor deposition from inexpensive commercially available industrial crude ammonia and from crude ammonia recovered from the gallium nitride compound semiconductor process and to continuously supply the purified ammonia to the gallium nitride compound semiconductor process. The oil removing device removing oil from crude ammonia containing oil as impurities includes an oil filter cylinder accommodating a filtration element cylindrically formed from a filtration membrane processed into a shape of pleat, honeycomb, or space structure; and an oil adsorption cylinder filled with activated carbon. The ammonia purification apparatus is provided with the oil removing device; a catalyst cylinder filled with a catalyst containing nickel as an active component; and an adsorption cylinder filled with synthetic zeolite.

Abstract: An electrode sheet which is made by applying a coating solution prepared by dispersing graft polymer which is obtained by graft polymerizing an organic monomer and at least one of activated carbon and carbon black into a solvent over surfaces of a collector followed by drying and heat-treating. An electric double layer capacitor having a constitution of laminating a separator and the electrode sheet. An electrode sheet produced by forming polarizable electrodes strongly at ease over surfaces of collectors such as metal foil whose adhesion strength between the collector and the polarizable electrode hardly decreasing even by gases generated with repetition of charging and discharging electricity, oscillation or so and further, capable of maintaining characteristics such as internal resistance and so on favorably for a long term is provided.

Abstract: The heating packet of the present invention comprises an air-permeable bag containing a heat-generating composition or a sheet-like heat-generating body which generates heat upon contacting oxygen in air. The heat-generating composition or the sheet-like heat-generating body contains zinc powder instead of iron powder. By the use of zinc powder, the heat-generating composition and the sheet-like heat-generating body can be maintained flexible during the use of the heating packet or after heat generation.