Abstract: The present disclosure relates to a method for recovering ammonia, the method comprising (a) preparing a gas containing ammonia,(b) supplying the gas containing ammonia to a mixed solution of an aqueous solution of sulfuric acid and a antisolvent of ammonium sulfate, to obtain ammonium sulfate crystals, and (c) separating the ammonium sulfate crystals from the mixed solution, wherein a volume ratio of the antisolvent of ammonium sulfate to the aqueous solution of sulfuric acid is greater than 1.

Abstract: An electrostatic thermal bonding method for bonding a pair of glass substrates, is capable of solving the problems such as a contamination of a device and incomplete vacuum packaging due to gas generated during the bonding of glass substrates utilizing a conventional epoxy or frit. The electrostatic thermal bonding method uses a silicon-glass bonding mechanism. First, a silicon thin film is deposited on a metal thin film formed on a side of one glass substrate, and the two glass substrates are brought face to face with each other by bringing the silicon thin film into contact with the surface of the other glass substrate. A predetermined direct current voltage is applied between the metal thin film and the other glass substrate under a predetermined temperature, thereby the bonding between glass substrates is performed. In the glass-glass bonding method utilizing the silicon thin film, the direct current voltage in the range of 0 to 1000V is applied under a bonding temperature between 100 to 500° C.

Abstract: In the present invention, the vacuum packaging of a field emission display (FED) is achieved in a high vacuum apparatus using a glass-to-glass bonding. The apparatus may eliminate the problems encountered in the conventional art in which a ventilation tube is used, so that vacuum degree of the interior of panels of the FED is affected (decreased) by the gases generated in sealing the ventilation tube. Furthermore, in the prior art, a part of the ventilation tube remains on the panel of the FED for thereby increasing the thickness of the panels, and the ventilating of gases is not effectively performed by the extension of the tube and a big size hole.